Expansion Nuts | McMaster-Carr

	System of Measurement System of Measurement

Inch

Metric

	Thread Size Thread Size

	Material Material

	Finish Finish

Neoprene Rubber Coated

Cadmium Yellow-Chromate
Plated

	Body Type Body Type


Bulbed	Smooth

	For Maximum Material Thickness For Maximum Material Thickness

	Body Diameter Body Diameter

	Nut Type Nut Type


Rivet	Snap In

Square	Hex

Locknut

	Length Length

	Flange Diameter Flange Diameter

	For Minimum Material Thickness For Minimum Material Thickness

	Flange Thickness Flange Thickness

	Thread Type Thread Type

	Drill Bit Decimal Size Equivalent Drill Bit Decimal Size Equivalent

	Thread Spacing Thread Spacing

Coarse

Fine

	Hole Diameter Hole Diameter

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

DFARS Specialty Metals
COTS-Exempt

DFARS Specialty Metals
Compliant

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant with
Exemptions

RoHS Compliant

	Height Height

	Width Width

	Drill Bit Size Drill Bit Size

	Hex Nut Profile Hex Nut Profile


Standard	Thin

Extra Wide	Extra-Wide Thin

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

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298 Products

About Nuts, Materials, and Finishes

Sealing Screw-to-Install Rivet Nuts

The coated flange seals out moisture and prevents corrosion.

Screw-to-Install Rivet Nuts

These rivet nuts are mildly corrosion resistant.

Scratch-Resistant Screw-to-Install Rivet Nuts

A PVC coating minimizes the chance of scratching the surface of your material. These rivet nuts are more corrosion resistant than zinc-plated steel rivet nuts.

Insulating Rivet Nuts

A nonconductive rubber coating insulates the nut from electricity, seals out moisture, and damps vibration.

Snap-In Nuts

Plastic Snap-In Nuts

These nylon nuts are chemical resistant, nonconductive, and lightweight.

Steel Snap-In Nuts

Snap these nuts into square holes in thin materials.

Stainless Steel Snap-In Nuts

Stainless steel snap-in nuts have excellent corrosion resistance in most environments.

Flex-Top Locknuts for Heavy Vibration

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 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.

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.

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.

Stainless Steel Extra-Wide 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.

About Nuts, Materials, and Finishes

Rivet Nuts

Sealing Screw-to-Install Rivet Nuts

Screw-to-Install Rivet Nuts

Scratch-Resistant Screw-to-Install Rivet Nuts

Insulating Rivet Nuts

Snap-In Nuts

Plastic Snap-In Nuts

Steel Snap-In Nuts

Stainless Steel Snap-In Nuts

Flex-Top Locknuts for Heavy Vibration

Stainless Steel Flex-Top Locknuts for Heavy Vibration

Metric Stainless Steel Flex-TopLocknuts for Heavy Vibration

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

Steel Flex-Top Locknuts for Heavy Vibration

Metric Steel Flex-Top Locknuts for Heavy Vibration

Mil. Spec. Steel Flex-Top Locknuts for Heavy Vibration

Steel Thin Flex-Top Locknuts for Heavy Vibration

Stainless Steel Thin Flex-TopLocknuts for Heavy Vibration

Extra-Wide Thin Flex-Top Locknuts for Heavy Vibration

Stainless Steel Extra-Wide Flex-TopLocknuts for Heavy Vibration

Steel Extra-Wide Flex-Top Locknuts for Heavy Vibration

Metric Stainless Steel Flex-Top
Locknuts for Heavy Vibration

Mil. Spec. Stainless Steel Flex-Top
Locknuts for Heavy Vibration

Stainless Steel Thin Flex-Top
Locknuts for Heavy Vibration

Stainless Steel Extra-Wide Flex-Top
Locknuts for Heavy Vibration