McMaster-Carr

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	System of Measurement System of Measurement

Inch

Metric

	Thread Size Thread Size

	Thread Type Thread Type

	Thread Pitch Thread Pitch

	Material Material

Steel

Stainless Steel

	Finish Finish

Cadmium Plated

Cadmium Yellow-Chromate
Plated

Silver Plated

Black Oxide

	Nut Type Nut Type


Locknut	Hex

	Hex Nut Profile Hex Nut Profile


Standard	Thin

Extra Wide	Extra-Wide Thin

	Height Height

	Width Width

	Thread Spacing Thread Spacing

Coarse

Fine

Extra Fine

	Thread Fit Thread Fit

Class 2B

Class 6H

Class 3B

	Specifications Met Specifications Met

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173 Products

About Nuts, Materials, and Finishes

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 18-8 stainless steel, these metric flex-top locknuts have good chemical resistance 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.

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About Nuts, Materials, and Finishes

Flex-Top Locknuts for Heavy Vibration

Steel Flex-Top Locknutsfor Heavy Vibration

Metric Steel Flex-TopLocknuts for Heavy Vibration

Mil. Spec. Steel Flex-TopLocknuts for Heavy Vibration

Stainless Steel Flex-TopLocknuts for Heavy Vibration

Metric Stainless Steel Flex-TopLocknuts for Heavy Vibration

Mil. Spec. Stainless Steel Flex-TopLocknuts for Heavy Vibration

Steel Thin Flex-TopLocknuts for Heavy Vibration

Stainless Steel Thin Flex-TopLocknuts for Heavy Vibration

Steel Extra-Wide Flex-TopLocknuts for Heavy Vibration

Stainless Steel Extra-Wide Flex-TopLocknuts for Heavy Vibration

Extra-Wide Thin Flex-TopLocknuts for Heavy Vibration