Expanding Hex Locknuts | McMaster-Carr

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	Locking Type Locking Type	Show

	Flex-Top

	Locking Type Locking Type	Hide


Nylon Insert	Distorted Thread

Flex-Top	Lock Washer

Serrations	Cotter Pin

Steel Insert	Thread Forming

Spring-Stop	Two-Piece Clamp

	Nut Type Nut Type	Show

	Hex

	Nut Type Nut Type	Hide


Hex	Locknut

	System of Measurement System of Measurement

Inch

Metric

	Thread Size Thread Size

	Material Material

Steel

Stainless Steel

	Finish Finish

Black Oxide

Cadmium Plated

Cadmium Yellow-Chromate
Plated

Silver Plated

	Hex Nut Profile Hex Nut Profile


Standard	Thin

Extra-Wide Thin	Extra Wide

	Height Height

	Width Width

	Thread Direction Thread Direction

	Right Hand

	Thread Fit Thread Fit

Class 2B

Class 3B

Class 6H

	Thread Spacing Thread Spacing

Coarse

Fine

	Thread Type Thread Type

	Thread Pitch Thread Pitch

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

DFARS Specialty Metals
Compliant

	Drive Style Drive Style

	External Hex

	Specifications Met Specifications Met

Mil. Spec.

NAS

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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 stainless steel, these metric flex-top locknuts resist chemicals 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.