Crown Locknuts | McMaster-Carr

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Cadmium Yellow-Chromate Plated

Corrosion-Resistant Coated

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Unified Standard Class 2B

Unified Standard Class 3B

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Assortment

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Compliant with Exemptions

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Stainless Steel

Steel

Insert Maximum Temperature

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1,408 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

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

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

Spring-Stop Locking About Spring-Stop Locking

Spring-Stop Locknuts

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

10 products

Other Products

Press-Fit Nuts

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

17 products