Right Hand Nuts | McMaster-Carr

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About Nuts, Materials, and Finishes

Medium-Strength Steel Hex Nuts—Grade 5

These nuts are suitable for fastening most machinery and equipment.

Metric Medium-Strength Steel Hex Nuts—Class 8

Class 8 nuts are comparable in strength to Class 8.8 bolts and are suitable for fastening most machinery and equipment.

Metric Fine-Thread Medium-Strength
Steel Hex Nuts—Class 8

Mil. Spec. Medium-Strength Steel Hex Nuts

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

JIS Medium-Strength Steel Hex Nuts

These metric nuts meet JIS (Japanese Industrial Standard) B 1181.

High-Strength Steel Hex Nuts—Grade 8

These nuts are about 25% stronger than medium-strength steel nuts.

Metric High-Strength Steel Hex Nuts—Class 10

About 25% stronger than medium-strength steel nuts, these nuts are comparable in strength to class 10.9 bolts.

Metric Fine-Thread High-Strength
Steel Hex Nuts—Class 10

Closely spaced metric threads prevent these nuts from loosening due to vibration. About 25% stronger than medium-strength steel nuts, these nuts are comparable in strength to Class 10.9 bolts.

Mil. Spec. High-Strength Steel Hex Nuts

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

High-Strength Steel Hex Nuts with Material Test Report

These nuts come with a traceable lot number and a physical and chemical test report.

Low-Strength Steel Hex Nuts

About half the strength of medium-strength steel nuts, these nuts are for light duty fastening applications.

Mil. Spec. Low-Strength Steel Hex Nuts

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

Metric Low-Strength Steel Hex Nuts

About half the strength of medium-strength steel nuts, these metric nuts are for light duty fastening applications.

Metric Fine-Thread Low-Strength Steel Hex Nuts

Extreme-Strength Steel Hex Nuts—Grade 9

These nuts are about 20% stronger than high strength steel nuts and are often used in heavy machinery.

Metric Extreme-Strength Steel Hex Nuts—Class 12

These metric nuts are about 20% stronger than high strength steel nuts and are often used in heavy machinery.

18-8 Stainless Steel Hex Nuts

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

Metric 18-8 Stainless Steel Hex Nuts

These nuts have good chemical resistance and may be mildly magnetic. Metric 18-8 stainless steel is also known as A2 stainless steel.

Metric Fine-Thread 18-8 Stainless Steel Hex Nuts

Mil. Spec. 18-8 Stainless Steel Hex Nuts

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

JIS 18-8 Stainless Steel Hex Nuts

These metric nuts meet JIS (Japanese industrial Standard) B 1181.

Super-Corrosion-Resistant 316 Stainless Steel Hex Nuts

These nuts have excellent chemical resistance and can be used in saltwater environments.

Metric Super-Corrosion-Resistant
316 Stainless Steel Hex Nuts

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

Ultra-Corrosion-Resistant Alloy
20 Stainless Steel Hex Nuts

The most corrosion resistant stainless steel nuts we offer, these nuts resist chemicals and acids in harsh environments.

Super-Corrosion-Resistant
High-Strength Bumax 88 Hex Nuts

Comparable in strength to Grade 5 steel and as resistant to chemicals and salt water as 316 stainless steel.

High-Strength Super-Corrosion-Resistant 316
Stainless Steel Hex Nuts for High-Pressure Applications

Hardened for added strength, these nuts are more corrosion resistant to chemicals and salt water than 18-8 stainless steel nuts.

High-Temperature High-Strength
A286 Stainless Steel Hex Nuts

Often used to fasten parts in engines and turbines, these nuts are comparable in strength to Grade 8 steel.

Seize-Resistant High-Strength
410 Stainless Steel Hex Nuts

These nuts resist sticking during installation and are comparable in strength to Grade 5 steel.

High-Strength 17-4 PH Stainless Steel Hex Nuts

Commonly used to fasten structural parts and pumps, these nuts are comparable in strength to Grade 8 steel.

Nylon Hex Nuts

Made from nylon 6/6, these nuts resist oil, grease, and solvents (except mineral acids).

Metric Nylon Hex Nuts

These metric nuts resist oil, grease, and solvents (except mineral acids).

High-Strength High-Temperature PEEK Hex Nuts

PEEK nuts are often used as an alternative to metal hex nuts. They withstand temperatures up to 550° F and resist acids, bases, and salt solutions.

Fiberglass Hex Nuts

Fiberglass nuts are stronger than nylon 6/6 nuts. They resist acids, solvents, salt water, and oil.

Impact-Resistant Polycarbonate Hex Nuts

Polycarbonate nuts stand up to oil, grease, and detergents.

High-Temperature Chemical-Resistant PTFE Hex Nuts

PTFE nuts withstand temperatures up to 500° F. They resist oil, grease, detergents, and most mineral acids. They're the lowest friction plastic nuts we offer, so they thread on smoothly.

Glass-Filled Nylon Hex Nuts

Glass-filled nylon nuts are stronger than nylon 6/6 nuts. They resist oil, grease, and solvents (except mineral acids).

Acid-Resistant PVC Hex Nuts

PVC nuts resist acids, alkalies, salt solutions, and alcohol.

Chemical-Resistant Polypropylene Hex Nuts

Polypropylene nuts resist organic solvents and degreasing agents.

High-Strength Chemical-Resistant PVDF Hex Nuts

Stronger than PTFE nuts and resistant to solvents, bases, and acids—including hydrochloric and nitric acid—these PVDF nuts are often used in chemical processing equipment.

Water-Resistant Acetal Hex Nuts

For use in wet environments, acetal nuts resist alcohol, gasoline, and solvents.

Brass Hex Nuts

These nuts are corrosion resistant in wet environments, electrically conductive, and nonmagnetic.

Metric Brass Hex Nuts

These metric nuts are corrosion resistant in wet environments, electrically conductive, and nonmagnetic.

Metric Fine-Thread Brass Hex Nuts

These brass nuts resist rusting from water and have closely spaced threads to prevent loosening from vibration.

Aluminum Hex Nuts

One-third the weight of steel, these aluminum nuts are corrosion resistant in wet environments and nonmagnetic.

Metric Aluminum Hex Nuts

One-third the weight of steel, these metric aluminum nuts are corrosion resistant in wet environments and nonmagnetic.

Bronze Hex Nuts

These nuts are resistant to salt water, electrically conductive, and nonmagnetic.

Metric Bronze Hex Nuts

These metric nuts are resistant to salt water, electrically conductive, and nonmagnetic.

Titanium Hex Nuts

These nuts have a high strength-to-weight ratio and resist acids and salt water.

Metric Titanium Hex Nuts

These metric nuts have a high strength-to-weight ratio and resist acids and salt water.

Nickel Alloy Hex Nuts

Commonly used in valves, pumps, and shafts, these 400 nickel nuts resist salt water and caustic chemicals.

Super-Corrosion-Resistant Nickel Alloy Hex Nuts

More corrosion resistant than 400 nickel nuts, these nuts are often used in marine environments and chemical-processing plants.

Ceramic Hex Nuts

Ceramic nuts won't melt, seize, or become brittle—even at temperatures up to 3000° F.

Thin Hex Nuts

Medium-Strength Steel Thin Hex Nuts

Made from Grade 5 steel, these inch-sized nuts are suitable for most fastening applications.

Metric Medium-Strength Steel Thin Hex Nuts

Half as thick as regular hex nuts, these nuts fit into spaces with low height clearances. They are about half as strong as medium-strength steel, and are often used for light duty applications, such as securing access panels.

Metric Fine-Thread Medium-Strength
Steel Thin Hex Nuts

These nuts are half the height of standard hex nuts, and have closely spaced threads to prevent loosening from vibration. Half as strong as medium-strength steel nuts, they are often used for light-duty applications, such as fastening signs in place.

Low-Strength Steel Thin Hex Nuts

These nuts should be used for light duty fastening applications, such as securing access panels.

High-Strength Steel Thin Hex Nuts—Grade 8

These nuts are about 25% stronger than medium-strength steel thin hex nuts. Available in inch thread sizes.

18-8 Stainless Steel Thin Hex Nuts

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

Metric 18-8 Stainless Steel Thin Hex Nuts

Useful in low-clearance applications, these metric nuts are roughly half the height of standard hex nuts, but aren’t as strong. All are 18-8 stainless steel, which is nearly as strong as steel but won’t rust in outdoor, washdown, and other corrosive environments.

Metric Fine-Thread 18-8 Stainless Steel Thin Hex Nuts

Made with fine-pitch threads, vibration is less likely to loosen these metric nuts than those with coarse-pitch threads since the threads sit closer together. Also called jam nuts, they are roughly half the height of standard hex nuts, so they’re good for applications with low clearance.

Mil. Spec. 18-8 Stainless Steel Thin Hex Nuts

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

Metric Super-Corrosion-Resistant
316 Stainless Steel Thin Hex Nuts

These metric nuts are made of 316 stainless steel and half as tall as regular hex nuts—use them around chemicals and salt water when space is limited.

Super-Corrosion-Resistant 316
Stainless Steel Thin Hex Nuts

These nuts have excellent chemical resistance and can be used in saltwater environments.

Brass Thin Hex Nuts

These nuts are corrosion resistant in wet environments, electrically conductive, and nonmagnetic.

Metric Brass Thin Hex Nuts

Made from brass, these metric nuts are corrosion resistant in wet environments, electrically conductive, and nonmagnetic. About half the height of standard hex nuts, they are useful in low-clearance applications but have less tensile strength.

Plastic Thin Hex Nuts

Plastic nuts are chemical resistant, nonconductive, and lightweight.

Aluminum Thin Hex Nuts

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

Bronze Thin Hex Nuts

Bronze nuts are stronger and more resistant to salt water than brass nuts.

Titanium Thin Hex Nuts

Titanium nuts have a high strength-to-weight ratio and are resistant to acids and salt water.

Extra-Wide Hex Nuts

Extreme-Strength Steel Extra-Wide Hex Nuts—Grade 2H

These nuts are comparable in strength to Grade 9 bolts.

Metric Extreme-Strength Steel
Extra-Wide Hex Nuts—Grade 2H

Comparable in strength to Class 12.9 bolts.

Medium-Strength Steel Extra-Wide Hex Nuts—Grade 5

Also kown as heavy hex nuts, these nuts are about 10% wider and taller than standard hex nuts to distribute load over a large area.

High-Strength Steel Extra-Wide Hex Nuts

These Class 10 nuts are about 25% stronger than medium-strength steel extra-wide hex nuts.

Low-Strength Steel Extra-Wide Hex Nuts

About half the strength of medium-strength steel extra-wide hex nuts, use these nuts for light duty fastening applications, such as securing access panels.

18-8 Stainless Steel Extra-Wide Hex Nuts

These nuts have good chemical resistance.

Super-Corrosion-Resistant 316
Stainless Steel Extra-Wide Hex Nuts

More corrosion resistant than 18-8 stainless steel nuts, these nuts can be used in saltwater environments.

Brass Extra-Wide Hex Nuts

Brass nuts are resistant to corrosion in wet environments and electrically conductive.

Bronze Extra-Wide Hex Nuts

Bronze nuts are stronger and more resistant to salt water than brass nuts.

Extreme-Strength Steel Extra-Wide Hex
Nuts for Structural Applications—Grade DH

High-Strength Steel Extra-Wide Hex Nuts
for Structural Applications—Grade C

18-8 Stainless Steel Extra-Wide Hex
Nuts for High-Pressure Applications

These nuts have good chemical resistance.

Super-Corrosion-Resistant 316 Stainless Steel
Extra-Wide Hex Nuts for High-Pressure Applications

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

Steel Extra-Wide Hex Nuts for
High-Pressure Applications

Able to maintain their strength in high-pressure and high temperature environments, these nuts are used with ASTM A193 bolts to fasten pressure tanks, valves, and flanges.

Narrow Hex Nuts

18-8 Stainless Steel Narrow Hex Nuts

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

Mil. Spec. 18-8 Stainless Steel Narrow Hex Nuts

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

Super-Corrosion-Resistant 316
Stainless Steel Narrow Hex Nuts

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

Steel Narrow Hex Nuts

Also known as small-pattern hex nuts, these are about 20% narrower than standard hex nuts for use in tight spaces where standard hex nuts won't fit.

Brass Narrow Hex Nuts

Brass nuts are resistant to corrosion in wet environments and electrically conductive.

High Hex Nuts

Steel High Hex Nuts

With a height that is 50% taller than standard hex nuts, these nuts provide a larger gripping area for installation with a wrench.

Metric Steel High Hex Nuts

50% taller than standard hex nuts, these metric nuts provide a larger gripping area for installation with a wrench.

Stainless Steel High Hex Nuts

Stainless steel nuts have excellent corrosion resistance in most environments.

Extra-Wide Thin Hex Nuts

Extreme-Strength Steel Extra-Wide
Thin Hex Nuts—Grade 2H

These nuts are often used in conjunction with an extra-wide hex nut to fasten Grade 9 bolts in heavy machinery, such as earth-moving equipment.

Low-Strength Steel Extra-Wide Thin Hex Nuts

Use these nuts for light duty fastening applications, such as securing access panels.

Stainless Steel Extra-Wide Thin Hex Nuts

Stainless steel nuts have excellent corrosion resistance in most environments.

Brass Extra-Wide Thin Hex Nuts

Brass nuts are resistant to corrosion in wet environments and electrically conductive.

Nylon-Insert Locknuts

High-Strength Steel Nylon-Insert Locknuts—Grade 8

Includes inch thread sizes. These Grade 8 steel locknuts are 25% stronger than our medium-strength steel nylon-insert locknuts.

Metric High-Strength Steel
Nylon-Insert Locknuts—Class 10

A nylon insert keeps metric bolt threads from coming loose due to vibration, wear, and temperature swings. About 25% stronger than medium-strength steel locknuts, these nuts are made of high-strength, Class 10 steel.

Metric Fine-Thread High-Strength
Steel Nylon-Insert Locknuts—Class 10

Closely spaced metric threads prevent loosening from vibration. These Class 10 steel locknuts are 25% stronger than our medium-strength steel nylon-insert locknuts.

Medium-Strength Steel Nylon-Insert Locknuts—Grade 5

Made from Grade 5 steel, these inch-sized locknuts are suitable for fastening most machinery and equipment.

Metric Medium-Strength Steel
Nylon-Insert Locknuts—Class 8

Made from medium-strength steel with a nylon insert, these Class 8 metric locknuts are strong enough to use on most machinery and equipment that’s prone to vibration and temperature changes.

Metric Fine-Thread Medium-Strength
Steel Nylon-Insert Locknuts—Class 8

Get a grip on metric bolts exposed to vibration, wear, and changes in temperature. These metric locknuts have a nylon insert that holds onto bolts without damaging their threads.

Low-Strength Steel Nylon-Insert Locknuts

Made from low-strength steel, these locknuts should be used for light duty fastening applications, such as securing.access panels.

Mil. Spec. Low-Strength Steel Nylon-Insert Locknuts

Choose these locknuts for their adherence to strict military standards for material and construction. They’re low-strength steel, so they should be used for fastening panels and other light duty fastening applications.

18-8 Stainless Steel Nylon-Insert Locknuts

These locknuts have good chemical resistance.

Metric 18-8 Stainless Steel Nylon-Insert Locknuts

These metric locknuts have good chemical resistance.

Mil. Spec. 18-8 Stainless Steel Nylon-Insert Locknuts

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

Super-Corrosion-Resistant 316
Stainless Steel Nylon-Insert Locknuts

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

Metric Super-Corrosion-Resistant 316
Stainless Steel Nylon-Insert Locknuts

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

Aluminum Nylon-Insert Locknuts

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

Brass Nylon-Insert Locknuts

Brass locknuts are corrosion resistant in wet environments and electrically conductive.

Titanium Nylon-Insert Locknuts

Titanium locknuts have a high strength-to-weight ratio and are resistant to acids and salt water.

Thin Nylon-Insert Locknuts

Low-Strength Steel Thin Nylon-Insert Locknuts

These locknuts are about half the height of standard nylon-insert locknuts. Use them in light duty low clearance applications or jam one against a hex nut to hold it in place.

Metric Low-Profile Low-Strength
Steel Nylon-Insert Locknuts

With a shorter hex height than standard DIN 985 locknuts, these nylon-insert locknuts meet international ISO 10511 dimensional standards and are easy to install in tight spaces.

Mil. Spec. Low-Strength Steel
Thin Nylon-Insert Locknuts

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

High-Strength Steel Thin Nylon-Insert Locknuts

These Grade 8 locknuts are about 25% stronger than medium-strength steel thin locknuts.

Medium-Strength Steel Thin Nylon-Insert Locknuts

Grade 5 locknuts are suitable for fastening most machinery and equipment when used in conjunction with a standard hex nut.

18-8 Stainless Steel Thin Nylon-Insert Locknuts

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

Mil. Spec. 18-8 Stainless Steel
Thin Nylon-Insert Locknuts

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

Super-Corrosion-Resistant 316 Stainless
Steel Thin Nylon-Insert Locknuts

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

Extra-Wide Thin Nylon-Insert Locknuts

High-Strength Steel Extra-Wide
Thin Nylon-Insert Locknuts

Comparable in strength to Grade 8 bolts, these locknuts are about three times stronger than low-strength steel extra-wide thin locknuts.

Low-Strength Steel Extra-Wide
Thin Nylon-Insert Locknuts

Use these locknuts for light duty fastening applications, such as securing access panels.

18-8 Stainless Steel Extra-Wide
Thin Nylon-Insert Locknuts

These locknuts have good chemical resistance.

Super-Corrosion-Resistant 316 Stainless
Steel Extra-Wide Thin Nylon-Insert Locknuts

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

Extra-Wide Nylon-Insert Locknuts

18-8 Stainless Steel Extra-Wide Nylon-Insert Locknuts

These locknuts have good chemical resistance.

Super-Corrosion-Resistant 316 Stainless
Steel Extra-Wide Nylon-Insert Locknuts

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

Steel Extra-Wide Nylon-Insert Locknuts

Known for their strength, these locknuts are zinc-plated to resist corrosion in wet environments.

Locknuts with Washer

Steel Locknuts with External-Tooth Lock Washer

Also known as Keps and K Lock nuts, these locknuts have a free-spinning tooth lock washer that grips the material surface instead of threads for easy installation and mild vibration resistance.

Metric Steel Locknuts with External-Tooth Lock Washer

These metric locknuts have a free-spinning tooth lock washer that grips the material surface instead of threads for easy installation and mild vibration resistance.

Stainless Steel Locknuts with
External-Tooth Lock Washer

These stainless steel locknuts have good chemical resistance and may be mildly magnetic.

Metric Stainless Steel Locknuts
with External-Tooth Lock Washer

These metric stainless steel locknuts have good chemical resistance and may be mildly magnetic.

Metric Steel Nonmarring Locknuts
with Spring-Lock Washer

A conical washer acts as a spring to add tension between the nut and the material surface for easy installation and mild vibration resistance. These metric locknuts have a smooth rim to resist scratching materials when tightened.

Steel Nonmarring Locknuts with Spring-Lock Washer

These locknuts have a curved washer that acts as a spring for easy installation and mild vibration resistance. The smooth rim makes them less likely to scratch materials when tightened than locknuts with a tooth lock washer.

Distorted-Thread Locknuts

High-Strength Steel Top-Lock
Distorted-Thread Locknuts

Comparable in strength to Grade 8 bolts, these locknuts are about 25% stronger than medium-strength steel locknuts.

Metric Medium-Strength Steel Top-Lock
Distorted-Thread Locknuts—Class 8

These metric locknuts have an irregularly shaped thread at the top of the nut that grips the bolt for a stronger hold than nylon-insert locknuts.

Medium-Strength Steel Top-Lock
Distorted-Thread Locknuts—Grade 5

These locknuts have an irregularly shaped thread at the top of the nut that grips the bolt for a stronger hold than nylon-insert locknuts.

Low-Strength Steel Top-Lock
Distorted-Thread Locknuts

About half the strength of medium-strength steel locknuts, these are for light duty fastening applications, such as securing access panels.

Extreme-Strength Steel Top-Lock
Distorted-Thread Locknuts

These Grade 9 locknuts are about 20% stronger than high-strength steel locknuts and are often used in heavy machinery, such as earth-moving equipment.

18-8 Stainless Steel Top-Lock
Distorted-Thread Locknuts

These locknuts have good chemical resistance.

Super-Corrosion-Resistant 316 Stainless
Steel Top-Lock Distorted-Thread Locknuts

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

High-Strength Steel Center-Lock
Distorted-Thread Locknuts—Grade 8

These Grade 8 locknuts are about three times stronger than low-strength steel distorted-thread locknuts.

Metric Medium-Strength Steel Center-Lock
Distorted-Thread Locknuts—Class 8

Strong enough for use with most machinery and equipment, these Class 8 metric locknuts have an irregularly shaped thread in the middle of the nut that grips bolts tighter than nylon-insert locknuts.

Low-Strength Steel Center-Lock
Distorted-Thread Locknuts

Use these locknuts for light duty fastening applications, such as securing access panels.

18-8 Stainless Steel Center-Lock
Distorted-Thread Locknuts

These locknuts have good chemical resistance.

Super-Corrosion-Resistant 316 Stainless
Steel Center-Lock Distorted-Thread Locknuts

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

Flex-Top Locknuts for Heavy Vibration

Steel Flex-Top Locknuts for Heavy Vibration

Threads at the top of these locknuts expand to grip the bolt on all sides for a stronger hold than distorted thread locknuts.

Metric Steel Flex-Top Locknuts for Heavy Vibration

Threads at the top of these metric locknuts expand to grip the bolt on all sides for a stronger hold than distorted-thread locknuts.

Mil. Spec. Steel Flex-Top Locknuts for Heavy Vibration

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

Stainless Steel Flex-Top Locknuts for Heavy Vibration

Made from 18-8 stainless steel, these flex top locknuts have good chemical resistance and may be mildly magnetic.

Metric Stainless Steel Flex-Top
Locknuts for Heavy Vibration

Made from stainless steel, these metric flex-top locknuts resist chemicals and may be mildly magnetic.

Mil. Spec. Stainless Steel Flex-Top
Locknuts for Heavy Vibration

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

Steel Thin Flex-Top Locknuts for Heavy Vibration

Known for their strength, these steel locknuts are cadmium plated to resist corrosion in wet environments.

Stainless Steel Thin Flex-Top
Locknuts for Heavy Vibration

Stainless steel locknuts have excellent corrosion resistance in most environments.

Steel Extra-Wide Flex-Top Locknuts for Heavy Vibration

Known for their strength, these steel locknuts are cadmium plated to resist corrosion in wet environments.

Stainless Steel Extra-Wide Flex-Top
Locknuts for Heavy Vibration

Stainless steel locknuts have excellent corrosion resistance in most environments.

Extra-Wide Thin Flex-Top Locknuts for Heavy Vibration

About half the height and 10% wider than standard flex-top locknuts, use these locknuts in low-clearance applications or jam one against an extra-wide hex nut to hold it in place.

Locknuts for use with Cotter Pins

Medium-Strength Steel Locknuts
for use with Cotter Pins—Grade 5

Also known as castle nuts, secure these nuts by inserting a cotter pin or safety wire through the slots and a drilled hole in your bolt for mild loosening resistance.

Metric Medium-Strength Steel Locknuts
for use with Cotter Pins—Class 8

Secure these metric nuts by inserting a cotter pin or safety wire through the slots and a drilled hole in your bolt for mild loosening resistance. Often referred to as castle nuts.

Low-Strength Steel Locknuts for use with Cotter Pins

About half the strength of medium-strength steel locknuts, these are for light duty fastening applications, such as securing access panels.

Stainless Steel Locknuts for use with Cotter Pins

Stainless steel locknuts have excellent corrosion resistance in most environments.

Steel-Insert Locknuts for Extreme Vibration

Steel-Insert Locknuts for Extreme Vibration—Grade 5

When installed, the steel insert grips the threads and lifts away from the nut body, isolating the insert from the nut's load to resist spinoff caused by vibration.

Metric Steel-Insert Locknuts
for Extreme Vibration—Class 8

The metric steel insert grips the threads and lifts away from the nut body when installed, isolating the insert from the nut's load to resist spinoff caused by vibration.

High-Strength Steel Extra-Wide Steel-Insert
Locknuts for Extreme Vibration—Grade 8

High-strength steel locknuts are about 25% stronger than medium-strength steel locknuts.

Medium-Strength Steel Extra-Wide Steel-Insert
Locknuts for Extreme Vibration—Grade 5

These locknuts are suitable for fastening most machinery and equipment.

Thin Steel-Insert Locknuts for Extreme Vibration

About two-thirds the height of standard steel-insert locknuts, use these locknuts in low-clearance applications or jam one against a hex nut to hold it in place.

Spring-Stop Locknuts

Metric Low-Strength Steel
Spring-Stop Locknuts—Class 6

These locknuts, also known as Fuji locknuts, maintain their holding power with reuse longer than nylon-insert locknuts. They have a spring ring that creates tension as you tighten the nut, keeping them in place.

Metric Stainless Steel Spring-Stop Locknuts

For a secure hold where chemicals are a concern, these stainless steel locknuts have a spring that creates tension when tightened. Also known as Fuji locknuts.

Serrated Locknuts

These locknuts have serrations that grip the material surface instead of the threads for easy installation and mild vibration resistance.

Two-Piece Thread-Clamping Locknuts for Extreme Vibration

Two-Piece Thread-Clamping
Locknuts for Extreme Vibration

These locknuts include a two-piece clamp that expands to grip the bolt on all sides and a concave jam nut that clamps the threads onto the bolt for added vibration resistance. They're also known as drake-style nuts.

Serrated Flange Locknuts

Medium-Strength Steel Serrated
Flange Locknuts—Grade 5

These flange locknuts have serrations that grip the material surface instead of the threads for easy installation and mild vibration resistance.

Metric Medium-Strength Steel
Serrated Flange Locknuts—Class 8

Strong enough for use in most machinery and equipment, these medium-strength metric nuts have serrations on the underside of the flange. The serrations prevent the nuts from loosening in applications with mild vibration.

High-Strength Steel Serrated
Flange Locknuts—Grade 8

These nuts are about 25% stronger than medium-strength steel flange locknuts.

Metric High-Strength Steel Serrated
Flange Locknuts—Class 10

They're about 25% stronger than medium-strength steel flange locknuts and comparable in strength to Class 10.9 bolts.

Low-Strength Steel Serrated Flange Locknuts

About half the strength of medium-strength steel flange locknuts, these are for light duty fastening applications, such as securing access panels.

18-8 Stainless Steel Serrated Flange Locknuts

Made from 18-8 stainless steel, these flange locknuts have good chemical resistance and may be mildly magnetic

Metric 18-8 Stainless Steel Serrated Flange Locknuts

Metric 18-8 stainless steel is also known as A2 stainless steel. These flange locknuts have good chemical resistance and may be mildly magnetic.

Super-Corrosion-Resistant 316 Stainless
Steel Serrated Flange Locknuts

These flange locknuts have excellent resistance to chemicals and salt water.

Metric Super-Corrosion-Resistant 316
Stainless Steel Serrated Flange Locknuts

Metric 316 stainless steel is also known as A4 stainless steel. These flange locknuts have excellent resistance to chemicals and salt water.

Nylon-Insert Flange Locknuts

Medium-Strength Steel Nylon-Insert
Flange Locknuts—Grade F

Grade F nuts are comparable in strength to Grade 5 bolts.

Metric Medium-Strength Steel
Nylon-Insert Flange Locknuts—Class 8

Metric High-Strength Steel Nylon-Insert
Flange Locknuts—Class 10

High-Strength Steel Nylon-Insert
Flange Locknuts—Grade G

Grade G nuts are comparable in strength to Grade 8 bolts.

Stainless Steel Nylon-Insert Flange Locknuts

Metric Stainless Steel Nylon-Insert Flange Locknuts

Distorted-Thread Flange Locknuts

High-Strength Steel Distorted-Thread Flange Locknuts

These flange locknuts are comparable in strength to Grade 8 bolts.

Metric High-Strength Steel Distorted-Thread
Flange Locknuts—Class 10

Grip metric bolts more securely than nylon-insert flange locknuts—the irregularly shaped threads on these locknuts hold extra tight. They resist vibration and sudden shocks, even after multiple uses.

Mil. Spec. Low-Strength Steel
Distorted-Thread Flange Locknuts

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

Stainless Steel Distorted-Thread Flange Locknuts

These flange locknuts have excellent resistance to chemicals and salt water. They have an irregularly shaped thread that grips the bolt for a stronger hold than nylon-insert flange locknuts.

Thread-Forming Flange Locknuts

These nylon flange locknuts form threads as they're tightened to resist vibration.

Flange Nuts

High-Strength Steel Flange Nuts—Grade 8

Made from Grade 8 steel, these nuts are about 25% stronger than medium-strength steel flange nuts.

Metric High-Strength Steel Flange Nuts—Class 10

Also known as collar nuts, these metric nuts have a flange that distributes pressure across the surface, so you don't need a washer. Made of high-strength Class 10 steel, they’re about 25% stronger than medium-strength steel flange nuts.

JIS High-Strength Steel Flange Nuts

These metric nuts meet JIS (Japanese Industrial Standard) B 1190.

Metric Medium-Strength Steel Flange Nuts—Class 8

No need for a washer—these metric medium-strength steel nuts have a flange that distributes pressure across its surface the way a washer does. Made of medium-strength, Class 8 steel, they’re suitable for fastening most machinery and equipment.

Medium-Strength Steel Flange Nuts

These Grade 5 flange nuts are suitable for fastening most machinery and equipment.

JIS Medium-Strength Steel Flange Nuts

Made to Japanese Industrial Standards, these nuts fasten most Japanese machinery and equipment without a washer.

Low-Strength Steel Flange Nuts

About half the strength of medium-strength steel flange nuts, use these nuts in light duty fastening applications, such as securing access panels.

Metric Low-Strength Steel Flange Nuts

About half the strength of medium-strength steel flange nuts, use these metric nuts in light duty fastening applications, such as securing access panels.

18-8 Stainless Steel Flange Nuts

Made from 18-8 stainless steel, these flange nuts have good chemical resistance.

Metric 18-8 Stainless Steel Flange Nuts

Skip the washer—these metric stainless steel nuts have a flange that does the same job, spreading pressure across its surface for a strong hold.

Super-Corrosion-Resistant 316
Stainless Steel Flange Nuts

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

Fiberglass Flange Nuts

Fiberglass flange nuts are chemical resistant, nonconductive, and lightweight.

High-Torque 12-Point Flange Nuts

Steel High-Torque 12-Point Flange Nuts

These flange nuts have a black-oxide finish for mild corrosion resistance in dry environments.

Stainless Steel High-Torque 12-Point Flange Nuts

Stainless steel nuts have excellent corrosion resistance in most environments.

Rotating Flange Nuts

The nut head rotates while the flange remains stationary to prevent scratching the material surface as you tighten the nut.

Leveling Flange Nuts

Steel Leveling Flange Nuts

These flange nuts have a black-oxide finish for mild corrosion resistance in dry environments.

Stainless Steel Leveling Flange Nuts

Stainless steel nuts have excellent corrosion resistance in most environments.

Coupling Nuts

Low-Strength Steel Coupling Nuts

About half the strength of medium-strength steel coupling nuts, these nuts are for light duty fastening applications.

Metric Low-Strength Steel Coupling Nuts

For light duty applications, choose these metric-sized coupling nuts.

Medium-Strength Steel Coupling Nuts—Grade 5

Made from Grade 5 steel, these inch-sized coupling nuts are suitable for most applications.

Metric Medium-Strength Steel Coupling Nuts—Class 8

Choose these locknuts to fasten standard metric threads. They’re Class 8 steel, so they can be used in most fastening applications.

High-Strength Steel Coupling Nuts—Grade 8

Made from Grade 8 steel, these nuts are about 25% stronger than medium-strength steel coupling nuts. Furnished in inch thread sizes.

Metric High-Strength Steel Coupling Nuts—Class 10

These metric-sized coupling nuts are Class 10 steel, so they’re about 25% stronger than medium-strength steel coupling nuts.

Extreme-Strength Steel Coupling Nuts

Comparable in strength to Grade 9 bolts, these coupling nuts are about 20% stronger than high-strength steel coupling nuts. Available in inch thread sizes.

18-8 Stainless Steel Coupling Nuts

These coupling nuts have good chemical resistance.

Metric 18-8 Stainless Steel Coupling Nuts

These metric coupling nuts have good chemical resistance.

Super-Corrosion-Resistant 316
Stainless Steel Coupling Nuts

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

Metric Super-Corrosion-Resistant
316 Stainless Steel Coupling Nuts

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

Brass Coupling Nuts

Brass coupling nuts are corrosion resistant in wet environments and electrically conductive.

Aluminum Coupling Nuts

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

Plastic Coupling Nuts

Plastic coupling nuts are chemical resistant, nonconductive, and lightweight.

Round Coupling Nuts

A smooth rounded body provides a finished look.

Stainless Steel Extra-Long Coupling Nuts

Stainless steel coupling nuts have excellent corrosion resistance in most environments.

Steel Extra-Long Coupling Nuts

Known for their strength, steel coupling nuts are available with a corrosion-resistant finish.

Coupling Nuts with Sight Hole

Use the sight hole to check for proper thread engagement.

Cap Nuts

18-8 Stainless Steel Cap Nuts

These cap nuts have good chemical resistance and may be mildly magnetic.

Metric 18-8 Stainless Steel Cap Nuts

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

Super-Corrosion-Resistant
316 Stainless Steel Cap Nuts

These cap nuts have excellent resistance to chemicals and salt water.

Metric Super-Corrosion-Resistant
316 Stainless Steel Cap Nuts

These metric cap nuts have excellent resistance to chemicals and salt water.

Low-Strength Steel Cap Nuts

About half the strength of medium-strength steel cap nuts, use them in light duty fastening applications, such as securing access panels.

Metric Low-Strength Steel Cap Nuts

These metric nuts are about half the strength of medium-strength steel cap nuts. Use them in light duty fastening applications, such as securing access panels.

High-Strength Steel Cap Nuts—Grade 8

These nuts are about 25% stronger than medium-strength steel cap nuts.

Metric High-Strength Steel Cap Nuts—Class 10

Comparable in strength to Class 10.9 bolts, these nuts are about 25% stronger than medium-strength steel cap nuts.

Medium-Strength Steel Cap Nuts

These Grade 5 cap nuts are suitable for fastening most machinery and equipment.

Plastic Cap Nuts

These nylon 6/6 cap nuts are chemical resistant, nonconductive, and lightweight.

Metric Plastic Cap Nuts

These metric nylon 6/6 cap nuts are chemical resistant, nonconductive, and lightweight.

Brass Cap Nuts

Brass cap nuts are corrosion resistant in wet environments and electrically conductive.

Aluminum Cap Nuts

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

Steel Extra-Wide High-Hex Cap Nuts

Known for their strength, these steel cap nuts have a black-oxide finish to resist corrosion in dry environments.

Stainless Steel Extra-Wide High-Hex Cap Nuts

Stainless steel cap nuts have excellent corrosion resistance in most environments.

Sanitary Low-Profile Cap Nuts

Certified by EHEDG (European Hygienic Engineering and Design Group) to meet sanitary design standards, these cap nuts fit into tight spaces to cover and seal exposed threads in your food processing facility.

Low-Profile Cap Nuts

Low-profile cap nuts are about 20% shorter than standard cap nuts for use in low-profile applications.

High-Profile Cap Nuts

These cap nuts offer at least three-times the thread depth of standard cap nuts and are about twice the height.

Sanitary Thread Caps

Cover exposed threads with these caps to help prevent bacteria growth in food processing areas and other sanitary environments.

About Nuts, Materials, and Finishes

Hex Nuts

Medium-Strength Steel Hex Nuts—Grade 5

Metric Medium-Strength Steel Hex Nuts—Class 8

Metric Fine-Thread Medium-StrengthSteel Hex Nuts—Class 8

Mil. Spec. Medium-Strength Steel Hex Nuts

JIS Medium-Strength Steel Hex Nuts

High-Strength Steel Hex Nuts—Grade 8

Metric High-Strength Steel Hex Nuts—Class 10

Metric Fine-Thread High-StrengthSteel Hex Nuts—Class 10

Mil. Spec. High-Strength Steel Hex Nuts

High-Strength Steel Hex Nuts with Material Test Report

Low-Strength Steel Hex Nuts

Mil. Spec. Low-Strength Steel Hex Nuts

Metric Low-Strength Steel Hex Nuts

Metric Fine-Thread Low-Strength Steel Hex Nuts

Extreme-Strength Steel Hex Nuts—Grade 9

Metric Extreme-Strength Steel Hex Nuts—Class 12

18-8 Stainless Steel Hex Nuts

Metric 18-8 Stainless Steel Hex Nuts

Metric Fine-Thread 18-8 Stainless Steel Hex Nuts

Mil. Spec. 18-8 Stainless Steel Hex Nuts

JIS 18-8 Stainless Steel Hex Nuts

Super-Corrosion-Resistant 316 Stainless Steel Hex Nuts

Metric Super-Corrosion-Resistant316 Stainless Steel Hex Nuts

Ultra-Corrosion-Resistant Alloy20 Stainless Steel Hex Nuts

Super-Corrosion-ResistantHigh-Strength Bumax 88 Hex Nuts

High-Strength Super-Corrosion-Resistant 316Stainless Steel Hex Nuts for High-Pressure Applications

High-Temperature High-StrengthA286 Stainless Steel Hex Nuts

Seize-Resistant High-Strength410 Stainless Steel Hex Nuts

High-Strength 17-4 PH Stainless Steel Hex Nuts

Nylon Hex Nuts

Metric Nylon Hex Nuts

High-Strength High-Temperature PEEK Hex Nuts

Fiberglass Hex Nuts

Impact-Resistant Polycarbonate Hex Nuts

High-Temperature Chemical-Resistant PTFE Hex Nuts

Glass-Filled Nylon Hex Nuts

Acid-Resistant PVC Hex Nuts

Chemical-Resistant Polypropylene Hex Nuts

High-Strength Chemical-Resistant PVDF Hex Nuts

Water-Resistant Acetal Hex Nuts

Brass Hex Nuts

Metric Brass Hex Nuts

Metric Fine-Thread Brass Hex Nuts

Aluminum Hex Nuts

Metric Aluminum Hex Nuts

Bronze Hex Nuts

Metric Bronze Hex Nuts

Titanium Hex Nuts

Metric Titanium Hex Nuts

Nickel Alloy Hex Nuts

Super-Corrosion-Resistant Nickel Alloy Hex Nuts

Ceramic Hex Nuts

Thin Hex Nuts

Medium-Strength Steel Thin Hex Nuts

Metric Medium-Strength Steel Thin Hex Nuts

Metric Fine-Thread Medium-StrengthSteel Thin Hex Nuts

Low-Strength Steel Thin Hex Nuts

High-Strength Steel Thin Hex Nuts—Grade 8

18-8 Stainless Steel Thin Hex Nuts

Metric 18-8 Stainless Steel Thin Hex Nuts

Metric Fine-Thread 18-8 Stainless Steel Thin Hex Nuts

Mil. Spec. 18-8 Stainless Steel Thin Hex Nuts

Metric Super-Corrosion-Resistant316 Stainless Steel Thin Hex Nuts

Super-Corrosion-Resistant 316Stainless Steel Thin Hex Nuts

Brass Thin Hex Nuts

Metric Brass Thin Hex Nuts

Plastic Thin Hex Nuts

Aluminum Thin Hex Nuts

Bronze Thin Hex Nuts

Titanium Thin Hex Nuts

Extra-Wide Hex Nuts

Extreme-Strength Steel Extra-Wide Hex Nuts—Grade 2H

Metric Extreme-Strength SteelExtra-Wide Hex Nuts—Grade 2H

Medium-Strength Steel Extra-Wide Hex Nuts—Grade 5

High-Strength Steel Extra-Wide Hex Nuts

Low-Strength Steel Extra-Wide Hex Nuts

18-8 Stainless Steel Extra-Wide Hex Nuts

Super-Corrosion-Resistant 316Stainless Steel Extra-Wide Hex Nuts

Metric Fine-Thread Medium-Strength
Steel Hex Nuts—Class 8

Metric Fine-Thread High-Strength
Steel Hex Nuts—Class 10

Metric Super-Corrosion-Resistant
316 Stainless Steel Hex Nuts

Ultra-Corrosion-Resistant Alloy
20 Stainless Steel Hex Nuts

Super-Corrosion-Resistant
High-Strength Bumax 88 Hex Nuts

High-Strength Super-Corrosion-Resistant 316
Stainless Steel Hex Nuts for High-Pressure Applications

High-Temperature High-Strength
A286 Stainless Steel Hex Nuts

Seize-Resistant High-Strength
410 Stainless Steel Hex Nuts

Metric Fine-Thread Medium-Strength
Steel Thin Hex Nuts

Metric Super-Corrosion-Resistant
316 Stainless Steel Thin Hex Nuts

Super-Corrosion-Resistant 316
Stainless Steel Thin Hex Nuts

Metric Extreme-Strength Steel
Extra-Wide Hex Nuts—Grade 2H

Super-Corrosion-Resistant 316
Stainless Steel Extra-Wide Hex Nuts

Extreme-Strength Steel Extra-Wide Hex
Nuts for Structural Applications—Grade DH

High-Strength Steel Extra-Wide Hex Nuts
for Structural Applications—Grade C

18-8 Stainless Steel Extra-Wide Hex
Nuts for High-Pressure Applications

Super-Corrosion-Resistant 316 Stainless Steel
Extra-Wide Hex Nuts for High-Pressure Applications

Steel Extra-Wide Hex Nuts for
High-Pressure Applications

Super-Corrosion-Resistant 316
Stainless Steel Narrow Hex Nuts

Extreme-Strength Steel Extra-Wide
Thin Hex Nuts—Grade 2H

Metric High-Strength Steel
Nylon-Insert Locknuts—Class 10

Metric Fine-Thread High-Strength
Steel Nylon-Insert Locknuts—Class 10

Metric Medium-Strength Steel
Nylon-Insert Locknuts—Class 8

Metric Fine-Thread Medium-Strength
Steel Nylon-Insert Locknuts—Class 8

Super-Corrosion-Resistant 316
Stainless Steel Nylon-Insert Locknuts

Metric Super-Corrosion-Resistant 316
Stainless Steel Nylon-Insert Locknuts

Metric Low-Profile Low-Strength
Steel Nylon-Insert Locknuts

Mil. Spec. Low-Strength Steel
Thin Nylon-Insert Locknuts

Mil. Spec. 18-8 Stainless Steel
Thin Nylon-Insert Locknuts

Super-Corrosion-Resistant 316 Stainless
Steel Thin Nylon-Insert Locknuts

High-Strength Steel Extra-Wide
Thin Nylon-Insert Locknuts

Low-Strength Steel Extra-Wide
Thin Nylon-Insert Locknuts

18-8 Stainless Steel Extra-Wide
Thin Nylon-Insert Locknuts

Super-Corrosion-Resistant 316 Stainless
Steel Extra-Wide Thin Nylon-Insert Locknuts

Super-Corrosion-Resistant 316 Stainless
Steel Extra-Wide Nylon-Insert Locknuts

Stainless Steel Locknuts with
External-Tooth Lock Washer

Metric Stainless Steel Locknuts
with External-Tooth Lock Washer

Metric Steel Nonmarring Locknuts
with Spring-Lock Washer

High-Strength Steel Top-Lock
Distorted-Thread Locknuts

Metric Medium-Strength Steel Top-Lock
Distorted-Thread Locknuts—Class 8

Medium-Strength Steel Top-Lock
Distorted-Thread Locknuts—Grade 5

Low-Strength Steel Top-Lock
Distorted-Thread Locknuts