M36 Nuts | McMaster-Carr

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 nuts.

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.

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

Metric Super-Corrosion-Resistant
316 Stainless Steel Hex Nuts

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

Metric Brass Hex Nuts

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

Thin Hex Nuts

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.

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.

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.

Steel Extra-Wide Hex Nuts

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

Comparable in strength to Class 12.9 bolts.

High-Strength Steel
Extra-Wide Hex Nuts

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

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 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.

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.

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.

Metric High-Strength Steel
Steel-Insert Locknuts for
Extreme Vibration—Class 10

When installed, the steel insert in these metric locknuts 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 High-Strength Steel Flange Nuts—Class 10

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.

Coupling Nuts

Metric 18-8 Stainless
Steel Coupling Nuts

These metric coupling nuts have good chemical resistance.

Brass Coupling Nuts

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

Power Transmission

Metric Ball Screws and Nuts

Internal ball bearings provide smooth low-friction travel in applications that require high speeds, accurate positioning, and repeatable movement. Also known as single-start metric ball screws and nuts, these have a single thread that runs the length of the screw.

Metric Fast-Travel
Ball Screws and Nuts

With multiple thread starts, these metric ball screws create linear travel that’s approximately three times faster than ball screws with a single thread start. They’re ideal for applications with an actuator.

Mounting Nuts for Shock Absorbers

Combine with mounting blocks to mount and secure threaded-body shock absorbers.

T-Slot Fasteners and Setup Studs

T-Slot Nuts

Designed to slide into T-slot tracks on machine tool tables, use these nuts to secure clamps and workpieces.

Setup Studs

Combine these setup studs with T-slot nuts, flanged nuts, setup clamps, or setup blocks to clamp and hold workpieces, vises, and other objects onto your fixturing table. Also known as double-ended studs, they have threads on both ends.

Eye Nuts—For Lifting

Create your own lifting eye by adding an eye nut to a stud or bolt.

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About Nuts, Materials, and Finishes

Hex Nuts

Metric Medium-StrengthSteel Hex Nuts—Class 8

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

Metric Left-Hand ThreadedMedium-Strength Steel Hex Nuts

Metric High-StrengthSteel Hex Nuts—Class 10

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

Metric Extreme-StrengthSteel Hex Nuts—Class 12

Metric 18-8 Stainless Steel Hex Nuts

Metric Fine-Thread 18-8Stainless Steel Hex Nuts

Metric Super-Corrosion-Resistant316 Stainless Steel Hex Nuts

Metric Brass Hex Nuts

Thin Hex Nuts

Metric Medium-StrengthSteel Thin Hex Nuts

Metric Fine-Thread Medium-StrengthSteel Thin Hex Nuts

Metric 18-8 StainlessSteel Thin Hex Nuts

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

Metric Super-Corrosion-Resistant316 Stainless Steel Thin Hex Nuts

Steel Extra-Wide Hex Nuts

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

High-Strength SteelExtra-Wide Hex Nuts

Locknuts

Metric High-Strength SteelNylon-Insert Locknuts—Class 10

Metric Medium-Strength SteelNylon-Insert Locknuts—Class 8

Metric Fine-Thread Medium-StrengthSteel Nylon-Insert Locknuts—Class 8

High-Strength Steel Top-LockDistorted-Thread Locknuts

Metric Medium-Strength SteelTop-Lock Distorted-Thread Locknuts—Class 8

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

Metric High-Strength SteelSteel-Insert Locknuts for Extreme Vibration—Class 10

Metric High-Strength Steel Flange Nuts—Class 10

Metric High-Strength SteelFlange Nuts—Class 10

Coupling Nuts

Metric 18-8 StainlessSteel Coupling Nuts

Brass Coupling Nuts

Power Transmission

Metric Ball Screws and Nuts

Metric Fast-TravelBall Screws and Nuts

Mounting Nuts for Shock Absorbers

T-Slot Fasteners and Setup Studs

T-Slot Nuts

Setup Studs

Eye Nuts—For Lifting

Eye Nuts—For Lifting

Metric Medium-Strength
Steel Hex Nuts—Class 8

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

Metric Left-Hand Threaded
Medium-Strength Steel Hex Nuts

Metric High-Strength
Steel Hex Nuts—Class 10

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

Metric Extreme-Strength
Steel Hex Nuts—Class 12

Metric Fine-Thread 18-8
Stainless Steel Hex Nuts

Metric Super-Corrosion-Resistant
316 Stainless Steel Hex Nuts

Metric Medium-Strength
Steel Thin Hex Nuts

Metric Fine-Thread Medium-Strength
Steel Thin Hex Nuts

Metric 18-8 Stainless
Steel Thin Hex Nuts

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

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

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

High-Strength Steel
Extra-Wide Hex Nuts

Metric 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

High-Strength Steel Top-Lock
Distorted-Thread Locknuts

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

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

Metric High-Strength Steel
Steel-Insert Locknuts for
Extreme Vibration—Class 10

Metric High-Strength Steel
Flange Nuts—Class 10

Metric 18-8 Stainless
Steel Coupling Nuts

Metric Fast-Travel
Ball Screws and Nuts