Expanding Hex Locknuts | McMaster-Carr

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Nylon Insert	Distorted Thread

Flex-Top	Lock Washer

Serrations	Cotter Pin

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Hex	Locknut

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Metric

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Stainless Steel

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Cadmium Yellow-Chromate
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Extra Wide	Extra-Wide Thin

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	Drive Style Drive Style

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177 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.

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.

Two-Piece Thread-Clamping Locknuts for Extreme Vibration

Two-Piece Thread-Clamping
Locknuts for Extreme Vibration

These locknuts include a flex-top locknut that expands to grip the bolt on all sides and a concave jam nut that clamps the threads onto the bolt for added vibration resistance. They're also known as drake-style nuts.

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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

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