Self-Locking Nuts | McMaster-Carr

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Grade 5 Titanium

Phosphor Bronze

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Stainless Steel

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2,605 Products

Locknuts

Nylon-Insert Locking About Nylon-Insert Locking

About Nylon-Insert Locking

Nylon-Insert Locknuts

Nylon-Insert Locknuts

Versatile and economical—the most commonly used locknuts

Thin-Profile Nylon-Insert Locknuts

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

Heavy-Profile Nylon-Insert Locknuts

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

High-Profile Nylon-Insert Locknuts

Larger gripping area keeps wrenches from slipping off as you tighten

Thin-Heavy-Profile Nylon-Insert Locknuts

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

Mil. Spec. Nylon-Insert Locknuts

Mil. Spec. Nylon-Insert Locknuts

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

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

Nylon-Insert Locknut Assortments

Nylon-Insert Locknut Assortments

A range of sizes to fasten a variety of parts

Distorted-Thread Locking About Distorted-Thread Locking

About Distorted-Thread Locking

Top-Lock Distorted-Thread Locknuts

Top-Lock Distorted-Thread Locknuts

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

Center-Lock Distorted-Thread Locknuts

Center-Lock Distorted-Thread Locknuts

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

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

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

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

Lock Washer About Lock Washer

About Lock Washer

Locknuts with External-Tooth Lock Washer

Locknuts with External-Tooth Lock Washer

Twist into place by hand to save on assembly time

Narrow-Profile Locknuts with External-Tooth Lock Washer

20% narrower than other nuts to fit in cramped spaces

Locknuts with Spring-Lock Washer

Locknuts with Spring-Lock Washer

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

Assortments of Locknuts with External-Tooth Lock Washer

Assortments of Locknuts with External-Tooth Lock Washer

A range of sizes to fasten a variety of parts

Cotter-Pin Lockable About Cotter-Pin Lockable

About Cotter-Pin Lockable

Locknuts for use with Cotter Pins

Locknuts for use with Cotter Pins

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

Flex-Top Locking About Flex-Top Locking

About Flex-Top Locking

Flex-Top Locknuts for Heavy Vibration

Flex-Top Locknuts for Heavy Vibration

Stronger hold than nylon-insert and distorted-thread locknuts

Thin-Profile Flex-Top Locknuts for Heavy Vibration

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

Heavy-Profile Flex-Top Locknuts for Heavy Vibration

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

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

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

Mil. Spec. Flex-Top Locknuts for Heavy Vibration

Mil. Spec. Flex-Top Locknuts for Heavy Vibration

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

Steel-Insert Locking About Steel-Insert Locking

About Steel-Insert Locking

Steel-Insert Locknuts for Extreme Vibration

Steel-Insert Locknuts for Extreme Vibration

The most vibration-resistant hold we offer

Thin-Profile Steel-Insert Locknuts for Extreme Vibration

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

Heavy-Profile Steel-Insert Locknuts for Extreme Vibration

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

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

About Two-Piece-Clamp Locking

Two-Piece-Clamp Locknuts for Extreme Vibration

Two-Piece-Clamp Locknuts for Extreme Vibration

Similar hold as steel-insert locknuts and install more quickly

Spring-Stop Locking About Spring-Stop Locking

About Spring-Stop Locking

Spring-Stop Locknuts

Spring-Stop Locknuts

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

Serration Locking About Serration Locking

About Serration Locking

Serrated Locknuts

Serrated Locknuts

Easiest to install but least effective against vibration

Thread-Forming Lock About Thread-Forming Lock

About Thread-Forming Lock

Thread-Forming Locknuts

Thread-Forming Locknuts

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

Other Products

Flange Nuts

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

Bearing Locknuts

Bearing Locknuts

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

Cap Nuts

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

Easy to tighten and loosen by hand for making frequent adjustments

Bearing Lock Washers

Bearing Lock Washers

Lock bearing nuts in place to prevent loosening due to vibration

Lock Washers

Resist vibration to prevent fasteners from loosening

Press-Fit Nuts

Push into drilled or punched holes to add threads to thin panels

Fastener Assortments

Fastener Assortments

Stay prepared by keeping fasteners in common sizes and materials on hand

Tamper-Resistant Nuts

Tamper-Resistant Nuts

Hard to detach without special tools to prevent unwanted removal

The quick brown fox jumped over the lazy dog. Pedestal (35" Ht. x 4" Wd. x 4" Dp.)