Self-Locking Hex Nuts | McMaster-Carr

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2,430 Products

Locknuts

Nylon-Insert Locking About Nylon-Insert Locking

Nylon-Insert Locknuts

Versatile and economical—the most commonly used locknuts

468 products

Thin-Profile Nylon-Insert Locknuts

About half the height of standard nuts to fit in spaces with low clearance

164 products

Heavy-Profile Nylon-Insert Locknuts

About 10% wider and taller than standard nuts to handle heavier loads

31 products

High-Profile Nylon-Insert Locknuts

Larger gripping area keeps wrenches from slipping off as you tighten

49 products

Thin-Heavy-Profile Nylon-Insert Locknuts

Fit in low-clearance spaces and handle heavier loads than standard nuts

33 products

Mil. Spec. Nylon-Insert Locknuts

Meet strict U.S. military standards for material and construction

21 products

Mil. Spec. Thin-Profile Nylon-Insert Locknuts

Meet U.S. military standards and are half the height of standard nuts to fit in low-clearance spaces

17 products

Nylon-Insert Locknut Assortments

A range of sizes to fasten a variety of parts

2 products

Distorted-Thread Locking About Distorted-Thread Locking

Top-Lock Distorted-Thread Locknuts

Irregularly shaped threads at the top grip screws tighter than a nylon insert

285 products

Center-Lock Distorted-Thread Locknuts

Thread on from either side so there’s no risk of damaging screws

86 products

Left-Hand-Thread Center-Lock Distorted-Thread Locknuts

Secure parts that rotate counterclockwise, such as the propeller on a mixer

6 products

Lock Washer About Lock Washer

Locknuts with External-Tooth Lock Washer

Twist into place by hand to save on assembly time

56 products

Narrow-Profile Locknuts with External-Tooth Lock Washer

20% narrower than other nuts to fit in cramped spaces

3 products

Locknuts with Spring-Lock Washer

Grip more tightly than external-tooth washers to better resist vibration

21 products

Assortments of Locknuts with External-Tooth Lock Washer

A range of sizes to fasten a variety of parts

2 products

Cotter-Pin Lockable About Cotter-Pin Lockable

Locknuts for use with Cotter Pins

Secure rotating parts subjected to mild vibration, such as wheels on carts

98 products

Flex-Top Locking About Flex-Top Locking

Flex-Top Locknuts for Heavy Vibration

Stronger hold than nylon-insert and distorted-thread locknuts

87 products

Thin-Profile Flex-Top Locknuts for Heavy Vibration

About two-thirds the height of standard nuts to fit in spaces with low clearance

58 products

Heavy-Profile Flex-Top Locknuts for Heavy Vibration

About 10% wider and taller than standard nuts to handle heavier loads

13 products

Thin-Heavy-Profile Flex-Top Locknuts for Heavy Vibration

Fit in low-clearance spaces and handle heavier loads than standard nuts

9 products

Mil. Spec. Flex-Top Locknuts for Heavy Vibration

Meet strict U.S. military standards for material and construction

18 products

Steel-Insert Locking About Steel-Insert Locking

Steel-Insert Locknuts for Extreme Vibration

The most vibration-resistant hold we offer

16 products

Thin-Profile Steel-Insert Locknuts for Extreme Vibration

About two-thirds the height of standard nuts to fit in spaces with low clearance

9 products

Heavy-Profile Steel-Insert Locknuts for Extreme Vibration

About 10% wider and taller than standard nuts to handle heavier loads

19 products

Two-Piece-Clamp Locking About Two-Piece-Clamp Locking

Two-Piece-Clamp Locknuts for Extreme Vibration

8 products

Spring-Stop Locking About Spring-Stop Locking

Spring-Stop Locknuts

Withstand heavy vibration similar to distorted-thread nuts and are reusable

10 products

Serration Locking About Serration Locking

Serrated Locknuts

Easiest to install but least effective against vibration

7 products

Thread-Forming Lock About Thread-Forming Lock

Thread-Forming Locknuts

Form threads into these nuts for a tight fit that won't loosen under vibration

7 products

Other Products

Flange Nuts

The flange distributes pressure, so you don't need a washer

399 products

Cap Nuts

Cover and protect threads while adding a finished look; also known as acorn nuts

79 products

Pipe Locknuts

Thread onto the male end of a pipe fitting so it won't loosen from vibration

119 products

Split Nuts

Swivel to attach at any point on a threaded rod for quick installation

18 products

Sealing Nuts

Prevent leaks and block out contaminants with a rubber seal

27 products

Bearing Locknuts

Hold bearings, bushings, pulleys, and gears in place on threaded shafts and spindles

163 products

Weld Nuts

Weld to metal surfaces to add permanent threads

22 products