Master-Tools

Socket Head Screws

With a deeper drive than flat and rounded head screws, these withstand more torque for a tighter hold

Alloy Steel Socket Head Screws

The standard for high-strength fastening.

Mil. Spec. Alloy Steel Socket Head Screws

Choose these screws for their adherence to strict military standards for material and construction.

Torx Alloy Steel Socket Head Screws

A Torx-Plus drive has more points of contact than a hex drive, allowing you to tighten these screws with less slippage or damage to the recess.

Left-Hand Threaded AlloySteel Socket Head Screws

Tighten these screws by turning them to the left; once fastened, they prevent counterclockwise-moving parts from loosening.

High-Temperature Alloy SteelSocket Head Screws—Grade B7

These screws are specially tempered to meet ASTM A193 specifications for temperatures up to 1100° F.

18-8 Stainless Steel Socket Head Screws

Use these general purpose 18-8 stainless steel screws for a variety of fastening applications. They have good chemical resistance.

Mil. Spec. 18-8 StainlessSteel Socket Head Screws

Choose these screws for their adherence to strict military standards for material and construction. Screws are 18-8 stainless steel for good chemical resistance.

Cleaned and Bagged 18-8 Stainless SteelSocket Head Screws for High Vacuum

Cleaned and double bagged in an ISO Class 5 (Fed. Std. Class 100) clean room, these screws are ready to use on chambers and components in high-vacuum systems.

Left-Hand Threaded 18-8 StainlessSteel Socket Head Screws

Tighten these screws by turning them to the left; once fastened, they prevent counterclockwise-moving parts from loosening. Made from 18-8 stainless steel, these screws have good chemical resistance.

Super-Corrosion-Resistant 316Stainless Steel Socket Head Screws

More corrosion resistant than 18-8 stainless steel screws, these 316 stainless steel screws have excellent resistance to chemicals and salt water.

High-Strength A286 StainlessSteel Socket Head Screws

Often used to fasten parts in engines and turbines, these are our strongest stainless steel screws. They are comparable in strength to alloy steel with the corrosion resistance of 18-8 stainless steel.

High-Strength 316 StainlessSteel Socket Head Screws

These screws are hardened to be 40% stronger than standard 316 stainless steel screws, yet they still have excellent corrosion resistance. Use them in chemical and marine applications.

Plastic Socket Head Screws

Plastic screws are chemical and oil resistant, nonconductive, and lightweight.

Brass Socket Head Screws

Brass screws are electrically conductive, nonmagnetic, and have good corrosion resistance.

Aluminum Socket Head Screws

Aluminum screws are one-third the weight of steel and have good corrosion resistance.

Titanium Socket Head Screws

Our most corrosion-resistant metal screws, titanium screws withstand salt water, acids, and chemicals. They have a high strength-to-weight ratio and are about 40% lighter than steel screws.

Nickel Alloy Socket Head Screws

More corrosion resistant than stainless steel screws, nickel alloy screws have excellent resistance to salt water and some acids.

Bronze Socket Head Screws

Bronze screws are about 40% stronger than brass screws and provide more corrosion resistance to salt water, gases, and sewage. They are nonmagnetic and electrically conductive.

Alloy Steel Low-Profile Socket Head Screws

Made of alloy steel, these low-profile screws are nearly twice as strong as their stainless steel counterparts. With half the height of a standard socket head, these low-profile screws fit in tight spaces.

18-8 Stainless Steel Low-ProfileSocket Head Screws

Nearly as strong as steel, these stainless steel screws won’t rust in outdoor, washdown, and other corrosive environments. With half the height of a standard socket head, these low-profile screws fit in tight spaces.

Super-Corrosion-Resistant 316 StainlessSteel Low-Profile Socket Head Screws

More corrosion resistant than 18-8 stainless steel screws, these 316 stainless steel screws have excellent resistance to chemicals and salt water. Use these low-profile screws where space is limited.

Alloy Steel Ultra-Low-Profile Socket Head Screws

Made from alloy steel, these screws are nearly twice as strong as stainless steel low-profile screws. With a head height one-third the size of a standard socket head, they fit in the tightest spaces.

316 Stainless Steel Ultra-Low-ProfileSocket Head Screws

More corrosion resistant than 18-8 stainless steel screws, these 316 stainless steel screws have excellent resistance to chemicals and salt water. Their ultra-low-profile lets them fit in the tightest spaces.

High-Profile Socket Head Screws

With a head one and a half times taller than a standard socket head, these screws are easier to install in deep counterbored holes and other hard-to-reach places.

Flanged Socket Head Screws

These general purpose flanged screws distribute pressure where the screw meets the surface, eliminating the need for a washer.

Exact-Grip-Length Flanged Socket Head Screws

For use where sideways forces are a concern, these screws have a precisely measured unthreaded portion (grip) for a strong hold. Their flanged head distributes pressure where the screw meets the surface, so you don't need a washer.

Serrated-Flange Socket Head Screws

Serrations under the head grip the material's surface for mild vibration resistance. The flange distributes pressure across the material's surface, eliminating the need for a washer.

18-8 Stainless Steel Thread-LockingSocket Head Screws

These screws have good chemical resistance. A thread locker bonded to the threads prevents loosening from vibration.

Super-Corrosion-Resistant 316 StainlessSteel Thread-Locking Socket Head Screws

More corrosion resistant than 18-8 stainless steel screws, these screws have excellent resistance to chemicals and salt water. They have a thread locker to resist vibration.

Alloy Steel Thread-Locking Socket Head Screws

With a tensile strength of 170,000 psi, these alloy steel screws are among the strongest we carry. They are stronger than Grade 8 steel screws and are nearly two and a half times stronger than stainless steel thread-locking screws. They have a thread locker to prevent loosening from vibration.

Alloy Steel Wire-Lockable Socket Head Screws

With a tensile strength of 170,000 psi, these alloy steel screws are among the strongest we carry. They are stronger than Grade 8 steel screws and are more than twice as strong as stainless steel wire-lockable screws. These resist vibration better than any other socket head screw.

Stainless Steel Wire-LockableSocket Head Screws

Stainless steel screws have excellent corrosion resistance in most environments. Wire these screws together for more vibration resistance than other types of socket head screws.

Stainless Steel Socket HeadScrews with Split Lock Washer

Stainless steel screws have excellent corrosion resistance in most environments. They have a split lock washer to create tension and resist loosening from vibration.

Alloy Steel Socket HeadScrews with Split Lock Washer

With a tensile strength of 180,000 psi, these alloy steel screws are among the strongest we carry. They are stronger than Grade 8 steel screws and more than two and a half times stronger than stainless steel screws with split lock washer. The split lock washer helps to resist vibration.

Vented Socket Head Screws

Drilled through the head and shaft, these screws vent fluid and gases trapped below the screw, making them good for vacuum applications.

High-Vacuum Cleaned-and-BaggedVented Socket Head Screws

Fasten these screws inside a high-vacuum system without bringing in contaminants.

Sealing Socket Head Screws

A rubber O-ring under the head of these screws prevents leaks and seals out contaminants.

Socket Head Screws with Flat Washer

A freely rotating washer distributes pressure over a wider area than a flange, preventing damage to your material's surface.

Vibration-Resistant Sealing Socket Head Screws

The nylon patch bonded to the threads of these socket head screws adds friction to keep vibration from loosening them, while their O-ring prevents leaks and seals out contaminants.

Socket Head Screws for Square-Drive Wrenches

No need for separate bits—these screws lock directly onto square‐drive socket wrenches, reducing the risk of dropping parts during installation.

Brass-Tip Alloy Steel Socket Head Screws

The nonmarring brass tip is electrically conductive and harder than nylon, but soft enough to conform to most surfaces and reduce damage from metal-on-metal contact.

Nylon-Tip Alloy Steel Socket Head Screws

Nonconductive and softer than brass, the nylon tip reduces vibration and eliminates damage from metal touching metal.

Socket Head Screw Assortments

About Rounded Head Screws

18-8 Stainless Steel ButtonHead Hex Drive Screws

18-8 stainless steel button head screws have good chemical resistance and may be mildly magnetic.

Metric 18-8 Stainless SteelButton Head Hex Drive Screws

316 Stainless Steel ButtonHead Hex Drive Screws

More corrosion resistant than 18-8 stainless steel screws, these button head screws have excellent resistance to chemicals and salt water. They may be mildly magnetic.

Metric 316 Stainless SteelButton Head Hex Drive Screws

316 stainless steel screws resist corrosion from chemicals and salt water better than 18-8 stainless steel screws. They may be mildly magnetic.

Fine-Thread Metric 316 StainlessSteel Button Head Hex Drive Screws

Closely spaced threads on these screws fit in holes with a fine pitch. They're not compatible with standard metric threads.

Alloy Steel Button Head Hex Drive Screws

Metric Alloy Steel Button Head Hex Drive Screws

These metric alloy steel screws are nearly twice as strong as stainless steel button head screws.

Brass Button Head Hex Drive Screws

Brass button head screws are corrosion resistant in wet environments, nonmagnetic, and electrically conductive.

Metric Brass Button Head Hex Drive Screws

Made from brass, these metric button head screws are corrosion resistant in wet environments, nonmagnetic, and electrically conductive.

Metric Titanium Button Head Hex Drive Screws

As strong as alloy steel and about 40% lighter, these metric titanium screws are known for their high strength-to-weight ratio. They stand up to salt water, acids, and chemicals.

Titanium Button Head Hex Drive Screws

Known for their high strength-to-weight ratio, these titanium screws are as strong as alloy steel and about 40% lighter. They stand up to salt water, acids, and chemicals.

18-8 Stainless Steel Pan Head Phillips Screws

18-8 stainless steel pan head screws have good chemical resistance and may be mildly magnetic.

Metric 18-8 Stainless SteelPan Head Phillips Screws

Made from 18-8 stainless steel, these metric pan head screws have good chemical resistance and may be mildly magnetic.

316 Stainless Steel Pan Head Phillips Screws

More corrosion resistant than 18-8 stainless steel screws, these pan head screws have excellent resistance to chemicals and salt water. They may be mildly magnetic.

Metric 316 Stainless SteelPan Head Phillips Screws

These metric 316 stainless steel screws resist corrosion from chemicals and salt water better than 18-8 stainless steel screws. They may be mildly magnetic.

Mil. Spec. Stainless SteelPan Head Phillips Screws

Choose these screws for their adherence to strict military standards for material and construction.

JIS Stainless Steel Pan Head Screws

Made to Japanese Industrial Standards, these screws have narrower and shorter heads than standard Phillips pan head screws.

Steel Pan Head Phillips Screws

These steel pan head screws are coated for corrosion resistance.

Metric Steel Pan Head Phillips Screws

A zinc plating makes these metric pan head screws corrosion resistant in wet environments.

JIS Steel Pan Head Screws

Made to Japanese Industrial Standards, these screws have narrower and shorter heads than standard Phillips pan head screws.

Mil. Spec. Steel Pan Head Phillips Screws

Choose these screws for their adherence to strict military standards for material and construction.

Nylon Pan Head Phillips Screws

Nylon pan head screws are chemical and oil resistant, nonconductive, and lightweight. Exposure to moisture may cause them to expand.

Metric Nylon Pan Head Phillips Screws

Made from nylon, these metric pan head screws are chemical and oil resistant, nonconductive, and lightweight. Exposure to moisture may cause them to expand.

Metric High-Strength High-TemperaturePEEK Pan Head Phillips Screws

These metric PEEK screws are reliable in harsh environments up to 500° F and withstand acids, bases, and salt solutions. All are chemical and oil resistant, nonconductive, and lightweight.

High-Strength High-TemperaturePEEK Pan Head Phillips Screws

Reliable in harsh environments up to 500° F, PEEK screws withstand acids, bases, and salt solutions. They are chemical and oil resistant, nonconductive, and lightweight.

Impact-Resistant PolycarbonatePan Head Phillips Screws

Polycarbonate screws resist breaking in high-impact applications. All are chemical and oil resistant, nonconductive, and lightweight.

Metric Impact-Resistant PolycarbonatePan Head Phillips Screws

Made from polycarbonate, these metric pan head screws resist breaking in high-impact applications. They are chemical and oil resistant, nonconductive, and lightweight.

Brass Pan Head Phillips Screws

Brass pan head screws are corrosion resistant in wet environments, nonmagnetic, and electrically conductive.

Metric Brass Pan Head Phillips Screws

Made from brass, these metric pan head screws are corrosion resistant in wet environments, nonmagnetic, and electrically conductive.

Titanium Pan Head Phillips Screws

Our most corrosion-resistant screws, these titanium pan head screws withstand salt water, acids, and chemicals. They have a high strength-to-weight ratio.

Metric Titanium Pan Head Phillips Screws

The most corrosion-resistant pan head screws we offer, these metric titanium screws withstand salt water, acids, and chemicals. They have a high strength-to-weight ratio.

18-8 Stainless Steel Extra-WideTruss Head Phillips Screws

These 18-8 stainless steel screws have good chemical resistance and may be mildly magnetic. The extra-wide truss head distributes holding pressure to reduce the likelihood of crushing thin material.

Metric 18-8 Stainless Steel Extra-WideTruss Head Phillips Screws

Made from 18-8 stainless steel, these metric screws have good chemical resistance and may be mildly magnetic. The extra-wide truss head distributes holding pressure to reduce the likelihood of crushing thin material.

316 Stainless Steel Extra-WideTruss Head Phillips Screws

More corrosion resistant than 18-8 stainless steel screws, these screws have excellent resistance to chemicals and salt water. The extra-wide truss head distributes holding pressure to reduce the likelihood of crushing thin material. Screws may be mildly magnetic.

Metric 316 Stainless Steel Extra-WideTruss Head Phillips Screws

These metric 316 stainless steel screws resist corrosion from chemicals and salt water better than 18-8 stainless steel screws. The extra-wide truss head distributes holding pressure to reduce the likelihood of crushing thin material. Screws may be mildly magnetic.

Stainless Steel DecorativeRound Head Phillips Screws

Stainless steel screws have excellent corrosion resistance in most environments.

Steel Decorative Round Head Phillips Screws

A zinc plating provides mild corrosion resistance.

Narrow Cheese Head Phillips Screws

A narrow head allows these screws to fit in tight spaces and a deep drive lets you maximize driving power.

High-Profile Narrow Fillister Head Phillips Screws

Taller than cheese head screws, these have a deep drive to maximize driving power and a narrow diameter to fit in tight spaces.

18-8 Stainless Steel Pan Head Slotted Screws

18-8 stainless steel pan head screws have good chemical resistance and may be mildly magnetic.

Metric 18-8 Stainless SteelPan Head Slotted Screws

Good for use outdoors and in washdown environments, these metric 18-8 stainless steel screws are more corrosion resistant than steel and nearly as strong. Their pan-shaped head sits nearly flat on the fastened surface, so there’s no need to countersink a hole.

316 Stainless Steel Pan Head Slotted Screws

More corrosion resistant than 18-8 stainless steel screws, these pan head screws have excellent resistance to chemicals and salt water. They may be mildly magnetic.

Metric 316 Stainless SteelPan Head Slotted Screws

These metric 316 stainless steel pan head screws resist corrosion from chemicals and salt water better than 18-8 stainless steel screws. They may be mildly magnetic.

Metric Steel Pan Head Slotted Screws

Install these metric pan head screws for a low-profile, finished look—no countersink required.

Steel Pan Head Slotted Screws

These pan head screws are zinc plated for corrosion resistance in wet environments.

Nylon Pan Head Slotted Screws

Nylon screws are chemical and oil resistant, nonconductive, and lightweight. Exposure to moisture may cause them to expand.

Metric Nylon Pan Head Slotted Screws

Made from nylon, these metric screws are chemical and oil resistant, nonconductive, and lightweight. Exposure to moisture may cause them to expand.

Extreme-Temperature Chemical-ResistantPTFE Pan Head Slotted Screws

PTFE screws withstand harsh chemicals and temperatures from -100° F to 500° F. They are nonconductive, lightweight, and resist wear due to their slippery surface.

Metric Extreme-Temperature Chemical-ResistantPTFE Pan Head Slotted Screws

These metric PTFE screws withstand harsh chemicals and temperatures from -100° F to 500° F. They are nonconductive, lightweight, and resist wear due to their slippery surface.

Brass Pan Head Slotted Screws

Brass pan head screws are corrosion resistant in wet environments, nonmagnetic, and electrically conductive.

Metric Brass Pan Head Slotted Screws

Made from brass, these metric pan head screws are corrosion resistant in wet environments, nonmagnetic, and electrically conductive.

18-8 Stainless Steel NarrowCheese Head Slotted Screws

More corrosion resistant than steel, and almost as strong, these 18-8 stainless steel screws have a narrower head than pan head screws to fit into tight spaces. They’re often used in electrical panels and next to flanges and raised surfaces in humid, damp, and washdown environments, but will corrode if exposed to salt water or chemicals.

316 Stainless Steel NarrowCheese Head Slotted Screws

More corrosion resistant than 18-8 stainless steel screws, these screws have excellent resistance to chemicals and salt water.

Steel Narrow Cheese Head Slotted Screws

With a narrower head than pan head screws, these cheese head screws fit in tight spaces, such as in electrical panels and next to flanges and raised surfaces.

Plastic Narrow Cheese Head Slotted Screws

Made from nylon, these screws are chemical and oil resistant, nonconductive, and lightweight.

Brass Decorative Round Head Slotted Screws

Made from brass, these screws are corrosion resistant in wet environments, nonmagnetic, and electrically conductive.

18-8 Stainless Steel DecorativeRound Head Slotted Screws

These screws have good chemical resistance.

316 Stainless Steel DecorativeRound Head Slotted Screws

More corrosion resistant than 18-8 stainless steel screws, these screws have excellent resistance to chemicals and salt water.

Steel Decorative Round Head Slotted Screws

A zinc plating provides mild corrosion resistance.

Aluminum DecorativeRound Head Slotted Screws

One-third the weight of steel, aluminum screws resist corrosion in wet environments.

Nylon Decorative Round Head Slotted Screws

Nylon screws are chemical and oil resistant, nonconductive, and lightweight. Exposure to moisture may cause them to expand.

Extreme-Temperature Chemical-ResistantPTFE Decorative Round Head Slotted Screws

PTFE screws withstand harsh chemicals and temperatures from -100° F to 500° F.

18-8 Stainless Steel High-ProfileNarrow Fillister Head Slotted Screws

These screws have good chemical resistance.

316 Stainless Steel High-ProfileNarrow Fillister Head Slotted Screws

More corrosion resistant than 18-8 stainless steel screws, these screws have excellent resistance to chemicals and salt water.

Steel High-Profile NarrowFillister Head Slotted Screws

A zinc plating provides mild corrosion resistance.

Brass High-Profile NarrowFillister Head Slotted Screws

Brass screws are corrosion resistant in wet environments, nonmagnetic, and electrically conductive.

Plastic High-Profile NarrowFillister Head Slotted Screws

Made from nylon, these screws are chemical and oil resistant, nonconductive, and lightweight.

Low-Profile Ultra-WideTruss Head Slotted Screws

When head height is important, these screws fit into spaces where other wide head screws won't fit. Also known as shutter screws, their ultra-wide truss head distributes the load over a large area for excellent holding pressure.

Metric Low-Profile Ultra-WideTruss Head Slotted Screws

Fit these metric screws into spaces where head height is important and other wide head screws won't fit. Also known as shutter screws, they have an ultra-wide truss head to distribute the load over a large area for excellent holding pressure.

Stainless Steel Binding Head Slotted Screws

Stainless steel screws have excellent corrosion resistance in most environments.

Plastic Binding Head Slotted Screws

Plastic screws are chemical and oil resistant, nonconductive, and lightweight.

Brass Binding Head Slotted Screws

Brass screws are corrosion resistant in wet environments, nonmagnetic, and electrically conductive.

Steel Binding Head Slotted Screws

A zinc plating provides mild corrosion resistance.

Stainless Steel Extra-WideTruss Head Slotted Screws

Stainless steel screws have excellent corrosion resistance in most environments.

Steel Extra-Wide Truss Head Slotted Screws

A zinc plating provides mild corrosion resistance.

Metric 18-8 Stainless SteelButton Head Torx Screws

18-8 stainless steel screws have good chemical resistance and may be mildly magnetic. A Torx drive has more points of contact than other drives, allowing you to tighten the screw without damaging the recess.

18-8 Stainless Steel Button Head Torx Screws

Made from 18-8 stainless steel, these screws have good chemical resistance and may be mildly magnetic. Torx and Torx-Plus drives have more points of contact than other drives, allowing you to tighten the screw without damaging the recess.

Metric Steel Button Head Torx Screws

The Torx or Torx-Plus drive on these metric screws have more points of contact than other drives, allowing you to tighten them without damaging the recess.

Alloy Steel Button Head Torx Screws

Made from alloy steel, these screws are three times stronger than standard steel button head Torx screws. A Torx-Plus drive has more points of contact than other drives, allowing you to tighten the screw without damaging the recess.

High-Strength A286 StainlessSteel Button Head Torx Screws

A286 stainless steel screws have comparable strength to alloy steel with the corrosion and chemical resistance of 18-8 stainless steel. They have a Torx drive that has more points of contact than other drives, allowing you to tighten the screw without damaging the recess.

Metric High-Strength A286 StainlessSteel Button Head Torx Screws

Made from A286 stainless steel, these metric screws provide the strength of alloy steel and the corrosion and chemical resistance of 18-8 stainless steel. They have a Torx drive that has more points of contact than other drives, allowing you to tighten the screw without damaging the recess.

Metric Steel Pan Head Torx Screws

These metric screws have a Torx drive for more points of contact than other drives, allowing you to tighten the screw without damaging the recess.

Steel Pan Head Torx Screws

These screws have a Torx or Torx-Plus drive for more points of contact than other drives, allowing you to tighten the screw without damaging the recess.

Metric Painted Steel Pan Head Torx Screws

Add a decorative look when fastening parts—these metric screws have a painted head.

Painted Steel Pan Head Torx Screws

Create a decorative appearance on your finished product—the head of these screws is painted.

Metric Stainless Steel Pan Head Torx Screws

These metric 18-8 stainless steel screws have good chemical resistance and may be mildly magnetic. Torx drives have more points of contact than other drives, allowing you to tighten the screw without damaging the recess.

Stainless Steel Pan Head Torx Screws

Made from 18-8 stainless steel, these screws have good chemical resistance and may be mildly magnetic. Torx and Torx-Plus drives have more points of contact than other drives, allowing you to tighten the screw without damaging the recess.

Pan Head Combination Phillips/Slotted Screws

Made from stainless steel, these screws are chemical resistant and may be mildly magnetic.

Metric Pan Head CombinationPhillips/Slotted Screws

These metric 18-8 stainless steel screws have good chemical resistance and may be mildly magnetic.

Decorative Round HeadCombination Phillips/Slotted Screws

These screws have a tall, domed head that provides a finished appearance. They're zinc plated to resist corrosion in wet environments.

Sanitary Extra-Wide Truss Head Screws

Designed for use in food, pharmaceutical, and other sanitary environments, these screws have an extra-wide truss head that distributes holding pressure to reduce the likelihood of crushing thin materials.

Metric 18-8 Stainless SteelFlanged Button Head Screws

Made from 18-8 stainless steel, these metric screws have good chemical resistance and may be mildly magnetic. They have a flange that distributes pressure across a wide surface, eliminating the need for a separate washer.

18-8 Stainless Steel FlangedButton Head Screws

18-8 stainless steel screws have good chemical resistance and may be mildly magnetic. The flange distributes pressure across a wide surface, eliminating the need for a separate washer.

Metric 316 Stainless SteelFlanged Button Head Screws

These metric 316 stainless steel screws resist corrosion from chemicals and salt water better than 18-8 stainless steel screws. They have a flange that distributes pressure across a wide surface, eliminating the need for a separate washer. Screws may be mildly magnetic.

316 Stainless Steel Flanged Button Head Screws

More corrosion resistant than 18-8 stainless steel screws, these screws have excellent resistance to chemicals and salt water. They have a flange that distributes pressure across a wide surface, eliminating the need for a separate washer. Screws may be mildly magnetic.

Alloy Steel Flanged Button Head Screws

Made from alloy steel, these screws are nearly twice as strong as stainless steel button head screws. They have a flange that distributes pressure across a wide surface, eliminating the need for a separate washer.

Metric Alloy Steel Flanged Button Head Screws

These metric alloy steel screws are nearly twice as strong as stainless steel button head screws. They have a flange that distributes pressure across a wide surface, eliminating the need for a separate washer.

Aluminum Ultra-WideFlanged Button Head Screws

These aluminum screws are lightweight and resist corrosion in wet environments. They have a flange that is wider and thicker than our other flanged screws, so they distribute pressure the best.

Metric Aluminum Ultra-WideFlanged Button Head Screws

Made from aluminum, these metric screws are lightweight and resist corrosion in wet environments. The flange is wider and thicker than our other flanged screws, so they distribute pressure the best.

Stainless Steel Ultra-WideFlanged Button Head Screws

Made from 18-8 stainless steel, these screws have good chemical resistance and may be mildly magnetic. The flange is wider and thicker than our other flanged screws, so they distribute pressure the best.

Metric Stainless Steel Ultra-WideFlanged Button Head Screws

These metric 18-8 stainless steel screws have good chemical resistance and may be mildly magnetic. The flange is wider and thicker than our other flanged screws, so they distribute pressure the best.

Metric Extra-Wide Flanged Button Head Screws

With a flange comparable in size to a washer, these metric screws distribute pressure better than standard flanged screws. Made from 316 stainless steel, they have excellent resistance to chemicals and salt water. Screws may be mildly magnetic.

Extra-Wide Flanged Button Head Screws

Comparable in diameter to a washer, the flange on these screws distributes pressure better than standard flanged screws. Made from 316 stainless steel, they have excellent resistance to chemicals and salt water. Screws may be mildly magnetic.

Stainless Steel Pan Head Screwswith Internal-Tooth Lock Washer

These stainless steel screws have good chemical resistance and may be mildly magnetic. The washer has sharp internal teeth that dig into surfaces to resist large amounts of vibration while the smooth outside edge provides a finished look. Also known as Sems screws, the washer rotates freely but is permanently attached.

Metric Stainless Steel Pan Head Screwswith Internal-Tooth Lock Washer

Made from stainless steel, these metric screws have good chemical resistance and may be mildly magnetic. The washer has sharp internal teeth that dig into surfaces to resist large amounts of vibration while the smooth outside edge provides a finished look. Also known as Sems screws, the washer rotates freely but is permanently attached.

Steel Pan Head Screws withInternal-Tooth Lock Washer

Sharp internal teeth dig into surfaces to resist large amounts of vibration, while the smooth outside edge provides a finished look. Also known as Sems screws, the washer rotates freely but is permanently attached.

Metric Steel Pan Head Screwswith Internal-Tooth Lock Washer

These metric screws have a washer with sharp internal teeth that dig into surfaces to resist large amounts of vibration. The smooth outside edge of the washer provides a finished look. Also known as Sems screws, the washer rotates freely but is permanently attached.

Steel Pan Head Screws withExternal-Tooth Lock Washer

The washer on these screws has sharp external teeth that dig into surfaces for maximum holding power and vibration resistance. Also known as Sems screws, the washer rotates freely but is permanently attached.

Metric Steel Pan Head Screwswith External-Tooth Lock Washer

These metric screws have a washer with sharp external teeth that dig into surfaces for maximum holding power and vibration resistance. Also known as Sems screws, the washer rotates freely but is permanently attached.

Stainless Steel Pan Head Screwswith External-Tooth Lock Washer

Made from stainless steel, these screws have good chemical resistance and may be mildly magnetic. All have a washer with sharp external teeth that dig into surfaces for maximum holding power and vibration resistance. Also known as Sems screws, the washer rotates freely but is permanently attached.

Metric Stainless Steel Pan Head Screwswith External-Tooth Lock Washer

These metric stainless steel screws have good chemical resistance and may be mildly magnetic. All have a washer with sharp external teeth that dig into surfaces for maximum holding power and vibration resistance. Also known as Sems screws, the washer rotates freely but is permanently attached.

Metric Stainless Steel Pan HeadScrews with Spring Lock Washer

These metric stainless steel screws have good chemical resistance and may be mildly magnetic. A curved washer protects delicate surfaces while providing constant tension. Also known as Square Cone Sems screws, the washer rotates freely but is permanently attached.

Stainless Steel Pan HeadScrews with Spring Lock Washer

Made from stainless steel, these screws have good chemical resistance and may be mildly magnetic. A curved washer protects delicate surfaces while providing constant tension. Also known as Square Cone Sems screws, the washer rotates freely but is permanently attached.

Steel Pan Head Screws with Spring Lock Washer

A zinc plating provides mild corrosion resistance.

Pan Head Screws with Flatand Split Lock Washer

The flat washer distributes holding pressure and protects delicate surfaces from damage while the split lock washer adds tension to prevent loosening from small amounts of vibration.

Metric Steel Pan Head Screwswith Split Lock Washer

As you tighten these metric screws, the split lock washer flattens to add tension and prevent loosening from small amounts of vibration. Also known as Sems screws, the washer rotates freely but is permanently attached.

Steel Pan Head Screws with Split Lock Washer

When compressed, the split lock washer flattens to add tension and prevent loosening from small amounts of vibration. Also known as Sems screws, the washer rotates freely but is permanently attached.

Stainless Steel Pan HeadScrews with Split Lock Washer

Stainless steel screws have excellent corrosion resistance in most environments.

Metric Thread-Locking Pan Head Phillips Screws

These metric screws have a nylon patch bonded to the threads that adds friction to prevent loosening from vibration. Made from 18-8 stainless steel, they have good chemical resistance and may be mildly magnetic.

Thread-Locking Pan Head Phillips Screws

A nylon patch bonded to the threads adds friction to prevent loosening from vibration. Made from 18-8 stainless steel, these screws have good chemical resistance and may be mildly magnetic.

Stainless Steel Thread-LockingButton Head Hex Drive Screws

Made from 18-8 stainless steel, these screws have good chemical resistance and may be mildly magnetic. A nylon patch bonded to the threads adds friction to prevent loosening from vibration.

Metric Stainless Steel Thread-LockingButton Head Hex Drive Screws

These metric 18-8 stainless steel screws have good chemical resistance and may be mildly magnetic. A nylon patch bonded to the threads adds friction to prevent loosening from vibration.

Alloy Steel Thread-LockingButton Head Hex Drive Screws

Made from alloy steel, these screws are nearly twice as strong as stainless steel button head screws.

Ultra Vibration-ResistantThread-Locking Rounded Head Screws

The epoxy adhesive on the threads provides twice the holding power of standard thread-locking screws, but requires time to harden.

Wire-Lockable Rounded Head Screws

Wire these screws together through the hole in the head for better vibration resistance than any other rounded head screw.

Stainless Steel Tamper-ResistantButton Head Torx Screws

These 18-8 stainless steel button head screws have good chemical resistance and may be mildly magnetic. The tamper-resistant Torx drive (also known as a pin-in Torx drive) makes them difficult to remove without special tools.

Metric Stainless Steel Tamper-ResistantButton Head Torx Screws

Made from 18-8 stainless steel, these metric button head screws have good chemical resistance and may be mildly magnetic. The tamper-resistant Torx drive (also known as a pin-in Torx drive) makes them difficult to remove without special tools.

Metric Sealing Stainless SteelTamper-Resistant Button Head Torx Screws

To prevent unwanted removal, these metric screws have a tamper-resistant Torx drive—also known as a pin-in Torx drive—that makes them difficult to unscrew without special tools. An O-ring under the head blocks leaks and seals out dust and dirt.

Sealing Stainless Steel Tamper-ResistantButton Head Torx Screws

To prevent unwanted removal, these screws have a tamper-resistant Torx drive—also known as a pin-in Torx drive—that makes them difficult to unscrew without special tools. An O-ring under the head blocks leaks and seals out dust and dirt.

Alloy Steel Tamper-ResistantButton Head Torx Screws

Made from alloy steel, these screws are nearly twice as strong as stainless steel button head screws. Their tamper-resistant Torx drive (also known as a pin-in Torx drive) makes them difficult to remove without special tools.

Metric Alloy Steel Tamper-ResistantButton Head Torx Screws

Nearly twice as strong as stainless steel button head screws, these metric screws are made from alloy steel. Their tamper-resistant Torx drive (also known as a pin-in Torx drive) makes them difficult to remove without special tools.

Tamper-Resistant DrilledSpanner Pan Head Screws

A tamper-resistant drilled spanner drive makes these screws difficult to remove without special tools. They're 18-8 stainless steel for good chemical resistance and may be mildly magnetic.

Metric Tamper-Resistant DrilledSpanner Pan Head Screws

These metric screws have a drilled spanner drive, making them difficult to remove without special tools. Made from 18-8 stainless steel, they have good chemical resistance and may be mildly magnetic.

Extra-Wide Tamper-ResistantDrilled Spanner Truss Head Screws

The extra-wide head distributes holding pressure to reduce the likelihood of crushing thin materials.

Stainless Steel Tamper-ResistantButton Head Hex Drive Screws

These 18-8 stainless steel button head screws have good chemical resistance and may be mildly magnetic. The tamper-resistant hex drive (also known as a pin-in hex drive) makes them difficult to remove without special tools.

Metric Stainless Steel Tamper-ResistantButton Head Hex Drive Screws

Made from 18-8 stainless steel, these metric button head screws have good chemical resistance and may be mildly magnetic. The tamper-resistant hex drive (also known as a pin-in hex drive) makes them difficult to remove without special tools.

Alloy Steel Tamper-ResistantButton Head Hex Drive Screws

Made from alloy steel, these screws are nearly twice as strong as stainless steel button head screws.

Stainless Steel Tamper-ResistantOne-Way Round Head Screws

Stainless steel screws have excellent corrosion resistance in most environments.

Steel Tamper-ResistantOne-Way Round Head Screws

A zinc plating provides mild corrosion resistance.

Tamper-Resistant Tri-GrooveRounded Head Screws

Difficult to remove without special tools, these screws have three grooves.

Tamper-Resistant AsymmetricalDrive Button Head Screws

These button head screws have a unique drive that is sold only by McMaster-Carr, making them difficult to remove without a special driver bit. Made from 18-8 stainless steel, they have good chemical resistance and may be mildly magnetic.

Metric Sealing Pan Head Screws

These metric screws have a silicone O-ring that prevents leaks and seals out contaminants. Made from 18-8 stainless steel, they have good chemical resistance and may be mildly magnetic.

Sealing Pan Head Screws

A rubber O-ring prevents leaks and seals out contaminants. Made from 18-8 stainless steel, these screws have good chemical resistance and may be mildly magnetic.

Vibration-Resistant SealingRounded Head Screws

A nylon patch bonded to the threads adds friction to resist loosening from vibration.

Vented Button Head Screws

These screws are drilled through the shaft to vent fluids and gases trapped under the screw. Made from 18-8 stainless steel, they have good chemical resistance and may be mildly magnetic.

Metric Vented Button Head Screws

To vent fluid and gas trapped under the screw, these metric screws are drilled through the shaft. Made from 18-8 stainless steel, they have good chemical resistance and may be mildly magnetic.

Left-Hand Threaded Button Head Screws

Tighten these screws by turning them to the left; once fastened, they prevent loosening from counterclockwise motion. Made from 18-8 stainless steel, these screws have good chemical resistance and may be mildly magnetic.

Metric Left-Hand Threaded Button Head Screws

Turn these metric screws to the left to tighten; once fastened, they prevent loosening from counterclockwise motion. Made from 18-8 stainless steel, they have good chemical resistance and may be mildly magnetic.

Hex-Drive Rounded Head Screw Assortments

These assortments include button head screws.

Phillips Rounded Head Screw Assortments

These assortments include pan head screws.

About Hex Head Screws and Bolts

High-Strength Grade 8 Steel Hex Head Screws

Made from Grade 8 steel, these screws can be used in high-stress applications, such as valves, pumps, motors, and automotive suspension systems. They are at least 25% stronger than medium-strength steel screws.

High-Strength Metric Class10.9 Steel Hex Head Screws

Choose these Class 10.9 steel screws for high-stress applications, such as valves, pumps, motors, and automotive suspension systems. They are at least 25% stronger than medium-strength steel screws.

High-Strength Steel Hex HeadScrews with Phillips Drive

When clearance for a wrench is limited, these screws have a Phillips drive so you can install them with a screwdriver. They are used for high-strength fastening.

Mil. Spec. High-Strength Steel Hex Head Screws

Choose these screws for their adherence to strict military standards for material and construction. Their high tensile strength means they can be used in demanding, high-stress applications.

High-Strength Steel Hex HeadScrews with Material Certification

These screws come with a traceable lot number and a physical and chemical test report. Use them for high-strength fastening.

Left-Hand Threaded High-StrengthSteel Hex Head Screws

Tighten these screws by turning them to the left; once fastened, they prevent counterclockwise-moving parts from loosening. For use in high-strength fastening applications.

Medium-Strength Grade5 Steel Hex Head Screws

Twice as strong as low-strength steel screws, these Grade 5 screws are suitable for fastening most machinery and equipment.

Medium-Strength Metric Class8.8 Steel Hex Head Screws

Twice as strong as low-strength steel screws, these metric Class 8.8 steel screws can be used to fasten most machinery and equipment.

Mil. Spec. Medium-StrengthSteel Hex Head Screws

Choose these screws for their adherence to strict military standards for material and construction. Use them to fasten most machinery and equipment.

Army-Navy Medium-StrengthSteel Hex Head Screws

These screws are made to stringent Army-Navy specifications that ensure performance and reliability. They're comparable in strength to Grade 5 steel screws.

JIS Medium-Strength Steel Hex Head Screws

Made to Japanese Industrial Standards, these Class 8.8 steel screws are good for fastening most machinery and equipment.

Left-Hand Threaded Medium-StrengthMetric Class 8.8 Steel Hex Head Screws

These metric screws help prevent counterclockwise-moving parts from loosening. Use them for medium-strength fastening.

Left-Hand Threaded Medium-StrengthGrade 5 Steel Hex Head Screws

Tighten these screws by turning them to the left; once fastened, they prevent counterclockwise-moving parts from loosening. For use in medium-strength fastening applications.

Low-Strength Steel Hex Head Screws

About half as strong as medium-strength steel screws, these screws can be used for light duty fastening applications, such as securing access panels.

Extreme-Strength Grade9 Steel Hex Head Screws

These screws are the strongest we offer. They are about 20% stronger than high-strength steel screws and are often used in heavy duty applications such as stamping and earth-moving equipment.

Extreme-Strength Metric Class12.9 Steel Hex Head Screws

Choose these metric screws for heavy duty stamping applications as well as earth-moving machinery, such as bulldozers and excavators. These screws are 10% stronger than our high-strength metric steel screws.

18-8 Stainless Steel Hex Head Screws

The standard choice for fastening in wet and outdoor conditions. Made of 18-8 stainless steel, these screws resist corrosion from mild chemicals and water.

Left-Hand Threaded 18-8Stainless Steel Hex Head Screws

Tighten these screws by turning them to the left; once fastened, they prevent counterclockwise-moving parts from loosening. Made from 18-8 stainless steel, these screws have good chemical resistance.

Super-Corrosion-Resistant 316Stainless Steel Hex Head Screws

More corrosion resistant than 18-8 stainless steel screws, these 316 stainless steel screws have excellent resistance to chemicals and salt water.

Super-Corrosion-Resistant High-StrengthBumax 88 Hex Head Screws

Choose these screws for their excellent corrosion resistance—comparable to 316 stainless steel—and the strength of steel. Use them for high-strength fastening in chemical and marine applications.

High-Strength 17-4 PH StainlessSteel Hex Head Screws

With the strength of steel and the corrosion resistance of 18-8 stainless steel, these 17-4 PH stainless steel screws are suitable for high-strength fastening in corrosive environments.

Stainless Steel Hex Screwand Nut Kits for Pipe Flanges

Join standard-sized stainless steel and aluminum pipe flanges in corrosive conditions.

Stainless Steel Heavy Hex Screwand Nut Kits for Pipe Flanges

Connect standard-size stainless steel pipe flanges with these kits—they come with screws and nuts in the right size and number to match the bolt holes. The screw heads are 10% wider than a standard hex head, so they spread force over a larger area, and you can tighten with more torque.

Hex Head Screw, Nut, and WasherKits for Plastic Pipe Flanges

Use these kits to connect plastic pipe flanges—they’re sized for Class 150 flanges made to ASME B16.5 dimensions. They come with screws, nuts, and washers that match the size and number of bolt holes for each pipe size.

Steel Hex Screw and Nut Kits for Pipe Flanges

Connect standard-sized steel and cast iron pipe flanges. These kits come with the right size and number of screws and nuts for the bolt holes in each pipe size.

Steel Heavy Hex Screw andNut Kits for Pipe Flanges

Join standard-sized steel and cast iron pipe flanges—these kits come with the screws and nuts in the right size and number to match the bolt holes. The screw heads and nuts are 10% wider than standard hex fasteners, so they spread force over a larger area, and you can tighten with more torque.

Plastic Hex Head Screws

Made from plastic, these screws are chemical and oil resistant, nonconductive, and lightweight.

Brass Hex Head Screws

Brass screws are electrically conductive, nonmagnetic, and have good corrosion resistance.

Aluminum Hex Head Screws

Aluminum screws are one-third the weight of steel and have good corrosion resistance.

Titanium Hex Head Screws

Our most corrosion-resistant metal screws, titanium screws withstand salt water, acids, and chemicals. They have a high strength-to-weight ratio—stronger than medium-strength steel screws and about 40% lighter.

Bronze Hex Head Screws

Bronze screws are 30% stronger than brass screws and provide more corrosion resistance to salt water, gases, and sewage. They are nonmagnetic and electrically conductive.

Nickel Alloy Hex Head Screws

More corrosion resistant than 316 stainless steel, nickel alloy screws have excellent resistance to salt water and some acids.

Fiberglass Hex Head Screws

Fiberglass screws are stronger than plastic screws, chemical and oil resistant, nonconductive, and lightweight.

Ceramic Hex Head Screws

Ceramic screws won't melt, rust, seize, or become brittle—even at extreme temperatures. They are nonconductive and highly resistant to corrosive gases.

Medium-Strength Steel Heavy HexHead Screws for Structural Applications

The most common heavy hex head screw, these steel screws meet ASTM A325 regulations for structural joints, such as mating I-beams and scaffolding.

Metric High-Strength Steel Heavy HexHead Screws for Structural Applications

Designed for construction, these metric screws are often used to join I-beams and scaffolding. They’re Class 10.9 steel, which is at least 25% stronger than medium-strength steel.

High-Strength Steel Heavy Hex HeadScrews for Structural Applications

50% stronger than our medium-strength steel heavy hex head screws, these screws meet ASTM A490 specifications for structural applications. Use them in joints that require more tensile strength than ASTM A325 screws.

18-8 Stainless Steel Heavy Hex HeadScrews for High-Pressure Applications

These Grade B8 screws are made from 18-8 stainless steel and have good chemical resistance. Also known as pressure bolts, they meet the high-pressure and high-temperature regulations of ASTM A193 and are used to secure pressure tanks, valves, and flanges.

Super-Corrosion-Resistant 316Stainless Steel Heavy Hex Head Screws for High-Pressure Applications

Made from 316 stainless steel, these Grade B8M screws are more corrosion resistant than 18-8 stainless steel screws. Also known as pressure bolts, these screws meet the high-pressure and high-temperature regulations of ASTM A193.

Steel Heavy Hex Head Screwsfor High-Pressure Applications

Made of Grade B7 steel, these screws are nearly twice as strong as Grade B8 and Grade B8M stainless steel screws. Also known as pressure bolts, they meet the high-pressure and high-temperature regulations of ASTM A193 and are used to secure pressure tanks, valves, and flanges.

Steel Heavy Hex Head Screwsfor Low-Temperature Applications

Made from Grade L7 steel, these screws don’t become brittle in the cold, so they stand up to impact even at temperatures as low as -150° F.

High-Strength Grade 8 SteelFlanged Hex Head Screws

Made from Grade 8 steel, these screws can be used in high-stress applications, such as valves, pumps, motors, and automotive suspension systems. They are at least 25% stronger than medium-strength steel screws. The flange distributes pressure over the surface, eliminating the need for a washer.

High-Strength Metric Class 10.9Steel Flanged Hex Head Screws

These metric screws are at least 25% stronger than medium-strength steel screws. Use them in high-stress applications, such as valves, pumps, motors, and automotive suspension systems. The flange distributes pressure where the screw meets the surface, so there's no need for a washer.

JIS High-Strength SteelFlanged Hex Head Screws

Made to Japanese Industrial Standards, these Class 10.9 steel screws can be used in high-stress applications, such as valves, pumps, motors, and automotive suspension systems. They are at least 25% stronger than medium-strength steel screws. The flange distributes pressure where the screw meets the surface, eliminating the need for a separate washer.

Medium-Strength Metric Class 8.8Steel Flanged Hex Head Screws

Choose these metric screws for fastening most machinery and equipment. With a flange distributing pressure where the screw meets the surface, there is no need for a separate washer.

Medium-Strength Grade 5 SteelFlanged Hex Head Screws

Twice as strong as low-strength steel screws, these Grade 5 screws are suitable for fastening most machinery and equipment. The flange distributes pressure where the screw meets the surface, so you don’t need a separate washer.

Extreme-Strength SteelFlanged Hex Head Screws

Comparable in strength to Grade 9 screws, these are about 20% stronger than high-strength steel screws and often used in heavy duty applications, such as stamping and earth-moving equipment. The flange eliminates the need for a washer.

Low-Strength Steel Flanged HexHead Screws with Phillips Drive

When there’s not enough room to turn these screws with a wrench, slip a screwdriver into their Phillips drive. About half as strong as medium-strength steel screws, they’re best for light duty fastening applications, such as securing access panels. The flange distributes pressure where the screw meets the surface, so you don’t need a separate washer.

Low-Strength Steel Flanged HexHead Screws with Slotted Drive

When there’s not enough room to turn these screws with a wrench, slip a screwdriver into their slotted drive. They’re about half as strong as medium-strength steel screws—use them for light duty fastening applications, such as securing access panels. The flange distributes pressure where the screw meets the surface, so you don’t need a separate washer.

Low-Strength Steel Flanged Hex Head Screws

About half as strong as medium-strength steel screws, these screws are best for light duty fastening applications, such as securing access panels. The flange distributes pressure where the screw meets the surface, so you don’t need a separate washer.

Stainless Steel Flanged Hex Head Screws

Made from 18-8 stainless steel, these screws have good chemical resistance. A flange under the head distributes pressure over the surface, eliminating the need for a washer.

Stainless Steel Flanged HexHead Screws with Slotted Drive

Install these screws with a wrench or a screwdriver. Made from stainless steel, they have good corrosion resistance. A flange under the head means a separate washer is not necessary.

Extreme-Strength StainlessSteel Flanged Hex Head Screws

For strength comparable to that of Grade 9 steel and the corrosion resistance of stainless steel, choose these screws. They are work-hardened for extreme strength. The flange eliminates the need for a separate washer.

Stainless Steel Flanged HexHead Screws with Phillips Drive

When a wrench won’t fit, turn these screws with a Phillips screwdriver instead. Made of 18-8 stainless steel, they resist corrosion from mild chemicals and water. The flange distributes pressure where the screw meets the surface, so you don’t need a separate washer.

Fiberglass Flanged Hex Head Screws

These screws are chemical and oil resistant, nonconductive, and lightweight. The flange eliminates the need for a washer, distributing pressure where the screw meets the surface.

Brass Flanged Hex Head Screws

Made of brass, these screws are electrically conductive, nonmagnetic, and corrosion resistant. The flange distributes pressure where the screw meets the surface, so you don’t need a separate washer.

Medium-Strength Grade 5 SteelSerrated-Flange Hex Head Screws

Made from Grade 5 steel, these screws are suitable for fastening most machinery and equipment. Serrations under the flange provide mild vibration resistance.

Medium-Strength Metric Class 8.8 SteelSerrated-Flange Hex Head Screws

These metric screws are suitable for fastening most machinery and equipment. They have a serrated flange that helps prevent loosening from vibration.

High-Strength Metric SteelSerrated-Flange Hex Head Screws

Choose these screws for high-stress applications, such as valves, pumps, motors, and automotive suspension systems. They are at least 25% stronger than medium-strength steel screws. Serrations under the head grip the surface of your material to help resist vibration.

High-Strength Grade 8 SteelSerrated-Flange Hex Head Screws

Made from Grade 8 steel, these screws are at least 25% stronger than medium-strength steel screws. They can be used in high-stress applications, such as valves, pumps, motors, and automotive suspension systems. Serrations under the head grip the surface of your material to help resist vibration.

Low-Strength Steel Serrated-FlangeHex Head Screws with Phillips Drive

When there’s not enough room to turn these screws with a wrench, slip a screwdriver into their Phillips drive. About half as strong as medium-strength steel screws, they’re best for light duty fastening applications, such as securing access panels. Their flange is serrated to help prevent loosening from vibration.

18-8 Stainless SteelSerrated-Flange Hex Head Screws

Made from 18-8 stainless steel, these screws have good chemical resistance. Their flange is serrated to help prevent loosening from vibration.

Super-Corrosion-Resistant 316 StainlessSteel Serrated-Flange Hex Head Screws

More corrosion resistant than 18-8 stainless steel screws, these 316 stainless steel screws have excellent resistance to chemicals and salt water. A serrated flange provides mild vibration resistance.

Extra-Wide Serrated-Flange Hex Head Screws

These screws have a flange that's at least 10% larger than a standard flange for more gripping power. Serrations under the head provide mild vibration resistance.

Cotter Pin-Lockable Hex Head Screws

Place a cotter pin through the hole in the shank to keep a nut from loosening. These screws have a stronger hold than screws with thread lockers or lock washers.

High-Strength Grade 8 SteelThread-Locking Hex Head Screws

Made from Grade 8 steel, these screws can be used in high-stress applications, such as valves, pumps, motors, and automotive suspension systems. They are more than twice as strong as our stainless steel thread-locking screws. The thread locker helps resist loosening from vibration.

Medium-Strength Metric Class 8.8 SteelThread-Locking Hex Head Screws

These Class 8.8 steel screws are suitable for fastening most machinery and equipment. They are over 50% stronger than stainless steel thread-locking screws. For vibration resistance, they have a thread locker bonded to the threads.

Stainless Steel Thread-Locking Hex Head Screws

Made from 18-8 stainless steel, these screws have good chemical resistance. They have a thread locker to prevent loosening from vibration.

Steel Wire-Lockable Hex Head Screws

These Grade 5 steel screws are over 70% stronger than our stainless steel wire-lockable hex head screws. Wire these screws together through the hole in the head to get more vibration resistance than any other screw.

Stainless Steel Wire-Lockable Hex Head Screws

Made from 18-8 stainless steel, these screws have the best chemical and corrosion resistance of our wire-lockable screws. Wire these screws together for more vibration resistance than other types of hex head screws.

Low-Strength Steel Hex HeadScrews with Lock Washer

Also known as Sems screws, these screws have a permanently attached but freely rotating tooth lock washer that bites into the mating surface for vibration resistance.

Tight-Spot Hex Head Screws

A high-strength alternative to blind rivets, use these screws when only one side of the material is accessible.

Hex Head Screws with Flat Washer

A freely rotating but permanently attached washer distributes pressure over a wider area than a flange, preventing damage to your material's surface.

Sealing Hex Head Screws

An O-ring under the head prevents leaks and seals out contaminants.

Sanitary Hex Head Screws

Bolt down equipment in food processing or sanitary areas while keeping out contaminants.

Vented Hex Head Screws

Drilled through the head and shaft, these screws vent fluid and gases trapped below the screw, making them good for vacuum applications.

18-8 Stainless Steel Hex HeadScrews with Nuts and Washers

Everything you need to make a complete joint in wet and outdoor conditions. These screws come with compatible nuts and washers. Made of 18-8 stainless steel, they resist corrosion from mild chemicals and water.

Medium-Strength Grade 5 Steel HexHead Screws with Nuts and Washers

Twice as strong as low-strength steel screws, these Grade 5 screws are suitable for fastening most machinery and equipment. They come with matching nuts and washers so you can make a complete joint.

Medium-Strength Class 8.8 Steel HexHead Screws with Nuts and Washers

Keep compatible screws, nuts, and washers on hand to make a strong joint. Twice as strong as low-strength steel screws, these Class 8.8 steel screws can be used to fasten most machinery and equipment.

Tension-Indicating Hex Head Screws

An indicator dot changes from red to black when the screw is properly tightened. If it comes loose, the dot changes back to red.

Hex Head Screw Assortments

These assortments include hex head screws and hex nuts.

About Flat Head Screws

Alloy Steel Hex Drive Flat Head Screws

Metric Alloy Steel Hex Drive Flat Head Screws

Mil. Spec. Alloy Steel HexDrive Flat Head Screws

Choose these screws for their adherence to strict military standards for material and construction.

18-8 Stainless Steel Hex Drive Flat Head Screws

These 18-8 stainless steel screws have good chemical resistance and may be mildly magnetic.

Metric 18-8 Stainless SteelHex Drive Flat Head Screws

These metric 18-8 stainless steel screws have good chemical resistance and may be mildly magnetic.

316 Stainless Steel Hex Drive Flat Head Screws

More corrosion resistant than 18-8 stainless steel screws, these screws have excellent resistance to chemicals and salt water. They may be mildly magnetic.

Metric 316 Stainless SteelHex Drive Flat Head Screws

More corrosion resistant than 18-8 stainless steel screws, these metric screws have excellent resistance to chemicals and salt water. They may be mildly magnetic.

Fine-Thread Metric 316 StainlessSteel Hex Drive Flat Head Screws

Closely spaced threads on these screws fit in holes with a fine pitch. They're not compatible with standard metric threads.

Mil. Spec. Stainless SteelHex Drive Flat Head Screws

Choose these screws for their adherence to strict military standards for material and construction.

Brass Hex Drive Flat Head Screws

Brass screws are electrically conductive, nonmagnetic, and have good corrosion resistance.

Metric Brass Hex Drive Flat Head Screws

These metric brass screws are electrically conductive, nonmagnetic, and have good corrosion resistance.

18-8 Stainless Steel Phillips Flat Head Screws

These screws have good chemical resistance and may be mildly magnetic.

Metric 18-8 Stainless SteelPhillips Flat Head Screws

These metric screws have good chemical resistance and may be mildly magnetic.

316 Stainless Steel Phillips Flat Head Screws

More corrosion resistant than 18-8 stainless steel screws, these screws have excellent resistance to chemicals and salt water.

Metric 316 Stainless SteelPhillips Flat Head Screws

More corrosion resistant than 18-8 stainless steel screws, these metric screws have excellent resistance to chemicals and salt water.

Mil. Spec. Stainless SteelPhillips Flat Head Screws

Choose these screws for their adherence to strict military standards for material and construction.

JIS Stainless Steel Flat Head Screws

These screws meet Japanese Industrial Standards.

Steel Phillips Flat Head Screws

These steel screws have a zinc plating for mild corrosion resistance.

Metric Steel Phillips Flat Head Screws

A zinc plating on these metric steel screws provides mild corrosion resistance.

JIS Steel Flat Head Screws

These screws meet Japanese Industrial Standards.

Mil. Spec. Steel Phillips Flat Head Screws

Choose these screws for their adherence to strict military standards for material and construction.

Brass Phillips Flat Head Screws

Brass screws are electrically conductive, nonmagnetic, and have good corrosion resistance.

Metric Brass Phillips Flat Head Screws

These metric brass screws are electrically conductive, nonmagnetic, and have good corrosion resistance.

Aluminum Phillips Flat Head Screws

Aluminum screws are lightweight and have good corrosion resistance.

Metric Titanium Phillips Flat Head Screws

Our most corrosion resistant screws, these metric titanium screws withstand salt water, acids, and chemicals.

Titanium Phillips Flat Head Screws

Our most corrosion resistant screws, titanium screws withstand salt water, acids, and chemicals.

Metric Alloy Steel Torx Flat Head Screws

These metric screws are twice as strong as standard steel Torx flat head screws.

Alloy Steel Torx Flat Head Screws

Made from alloy steel, these screws are twice as strong as standard steel Torx flat head screws.

Metric 18-8 Stainless SteelTorx Flat Head Screws

These metric 18-8 stainless steel screws have good chemical resistance and may be mildly magnetic.

18-8 Stainless Steel Torx Flat Head Screws

These 18-8 stainless steel screws have good chemical resistance and may be mildly magnetic.

Metric High-Strength A286 StainlessSteel Torx Flat Head Screws

These metric A286 stainless steel screws have comparable strength to alloy steel with the corrosion resistance of 18-8 stainless steel.

High-Strength A286 StainlessSteel Torx Flat Head Screws

A286 stainless steel screws have comparable strength to alloy steel with the corrosion resistance of 18-8 stainless steel.

Steel Torx Flat Head Screws

Lower strength than alloy steel, use these screws for light duty fastening.

18-8 Stainless Steel Slotted Flat Head Screws

These 18-8 stainless steel screws have good chemical resistance and may be mildly magnetic.

Metric 18-8 Stainless SteelSlotted Flat Head Screws

These metric 18-8 stainless steel screws have good chemical resistance and may be mildly magnetic.

316 Stainless Steel Slotted Flat Head Screws

More corrosion resistant than 18-8 stainless steel screws, these screws have excellent resistance to chemicals and salt water. They may be mildly magnetic.

Metric 316 Stainless SteelSlotted Flat Head Screws

More corrosion resistant than 18-8 stainless steel screws, these metric screws have excellent resistance to chemicals and salt water. They may be mildly magnetic.

Nylon Slotted Flat Head Screws

These screws are chemical and oil resistant, nonconductive, and lightweight. Exposure to moisture may cause them to expand.

Metric Nylon Slotted Flat Head Screws

These metric screws are chemical and oil resistant, nonconductive, and lightweight. Exposure to moisture may cause them to expand.

Impact-Resistant PolycarbonateSlotted Flat Head Screws

Polycarbonate screws resist breaking in high impact applications better than other plastic screws. All are chemical and oil resistant, nonconductive, and lightweight.

Metric Impact-Resistant PolycarbonateSlotted Flat Head Screws

These metric polycarbonate screws resist breaking in high-impact applications better than other plastic screws. All are chemical and oil resistant, nonconductive, and lightweight.

Extreme-Temperature Chemical-ResistantPTFE Slotted Flat Head Screws

PTFE screws are more chemical resistant than other plastic screws and withstand temperatures from -100° F to 500° F.

High-Strength High-TemperaturePEEK Slotted Flat Head Screws

These screws are more reliable in high-stress, high-temperature environments than other plastic screws. They withstand water, steam, and temperatures up to 500° F.

Steel Slotted Flat Head Screws

A zinc plating provides mild corrosion resistance.

Metric Steel Slotted Flat Head Screws

Angled under the head, these metric screws fit in countersunk holes and sit flush with the surface of your part.

Brass Slotted Flat Head Screws

Brass screws are electrically conductive, nonmagnetic, and have good corrosion resistance.

Metric Brass Slotted Flat Head Screws

These metric brass screws are electrically conductive, nonmagnetic, and have good corrosion resistance.

Aluminum Slotted Flat Head Screws

Aluminum screws are lightweight and have good corrosion resistance.

Tamper-Resistant Torx Flat Head Screws

With a tamper-resistant Torx or Torx Plus drive (also known as a pin-in Torx or Torx Plus drive), these screws are difficult to remove without special tools.

Metric Tamper-Resistant Torx Flat Head Screws

With a tamper-resistant Torx drive (also known as a pin-in Torx drive), these metric screws are difficult to remove without special tools.

Metric Sealing Tamper-ResistantTorx Flat Head Screws

With an O-ring under the head, these metric screws seal out leaks and contaminants while also preventing unwanted removal.

Sealing Tamper-Resistant Torx Flat Head Screws

Prevent unwanted removal, leaks, and contamination with these sealing Torx screws.

Tamper-Resistant DrilledSpanner Flat Head Screws

These screws have a tamper-resistant drilled spanner drive, which makes them difficult to remove without special tools.

Metric Tamper-Resistant DrilledSpanner Flat Head Screws

These metric screws have a tamper-resistant drilled spanner drive, making them difficult to remove without special tools.

Tamper-Resistant Hex Drive Flat Head Screws

A tamper-resistant hex drive (also known as pin-in hex drive) makes these screws difficult to remove without special tools.

Metric Tamper-ResistantHex Drive Flat Head Screws

With a tamper-resistant hex drive (also known as a pin-in hex drive), these metric screws are difficult to remove without special tools.

Metric Sealing Flat Head Screws

To prevent leaks and seal out contaminants, these metric screws have an O-ring under the head.

Sealing Flat Head Screws

With an O-ring under the head, these screws prevent leaks and seal out contaminants.

Alloy Steel Thread-LockingHex Drive Flat Head Screws

Made from alloy steel, these screws are nearly twice as strong as stainless steel flat head screws.

Stainless Steel Thread-LockingHex Drive Flat Head Screws

Stainless steel screws have excellent corrosion resistance in most environments.

Metric Phillips Thread-Locking Flat Head Screws

A nylon patch bonded to the threads of these metric screws adds friction to prevent loosening from vibration. Made of 18-8 stainless steel, they have good chemical resistance and may be mildly magnetic.

Phillips Thread-Locking Flat Head Screws

A nylon patch bonded to the threads adds friction to prevent loosening from vibration. Made of 18-8 stainless steel, these screws have good chemical resistance and may be mildly magnetic.

Vented Flat Head Screws

These screws are drilled through the shaft to vent fluids and gases trapped under the screw.

Metric Vented Flat Head Screws

To vent fluids and gases trapped under the screw, these metric screws are drilled through the shaft.

Metric Left-Hand Threaded Flat Head Screws

Tighten these metric screws by turning them to the left; once fastened, they prevent loosening from counterclockwise motion.

Left-Hand Threaded Flat Head Screws

Tighten these screws by turning them to the left; once fastened, they prevent loosening from counterclockwise motion.

Flat Head Screw Assortments

Flat head screws are angled under the head to fit flush within countersunk holes.

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