Thin Locknuts | McMaster-Carr

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	Hex Nut Profile Hex Nut Profile


Thin	Extra-Wide Thin

	System of Measurement System of Measurement

Inch

Metric

Pipe

	Thread Size Thread Size

	Nut Type Nut Type


Hex	Locknut

Panel

	Locking Type Locking Type


Nylon Insert	Flex-Top

Steel Insert

	Material Material

Steel

Stainless Steel

Brass

	Finish Finish

Black Oxide

Black Phosphate

Black Ultra-Corrosion-
Resistant Coated

Black Zinc Plated

Cadmium Plated

Cadmium Yellow-Chromate
Plated

Nickel Plated

Zinc Plated

Zinc Yellow-Chromate Plated

	Height Height

	Width Width

	Thread Direction Thread Direction

	Right Hand

	Fastener Strength Grade/Class Fastener Strength Grade/Class


Grade 5	Grade 8

Grade C

	Thread Spacing Thread Spacing

Coarse

Fine

Extra Fine

	Thread Fit Thread Fit

Class 2B

Class 3B

Class 6H

	Thread Type Thread Type

	Pipe Size Pipe Size

	Thread Pitch Thread Pitch

1.5 mm

	Drive Style Drive Style

	External Hex

	Insert Maximum Temperature Insert Maximum Temperature

220° F

250° F

Not Rated

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

DFARS Specialty Metals
COTS-Exempt

DFARS Specialty Metals
Compliant

	Specifications Met Specifications Met

Mil. Spec.

NAS

	Panel Nut Shape Panel Nut Shape

	Hex

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About Nuts, Materials, and Finishes

Low-Strength Steel Thin Nylon-Insert Locknuts

These locknuts are about half the height of standard nylon-insert locknuts. Use them in light duty low clearance applications or jam one against a hex nut to hold it in place.

Mil. Spec. Low-Strength Steel
Thin Nylon-Insert Locknuts

Choose these locknuts for their adherence to strict military standards for material and construction.

High-Strength Steel Thin Nylon-Insert Locknuts

These Grade 8 locknuts are about 25% stronger than medium-strength steel thin locknuts.

Medium-Strength Steel Thin Nylon-Insert Locknuts

Grade 5 locknuts are suitable for fastening most machinery and equipment when used in conjunction with a standard hex nut.

18-8 Stainless Steel Thin Nylon-Insert Locknuts

These locknuts have good chemical resistance and may be mildly magnetic.

Mil. Spec. 18-8 Stainless Steel
Thin Nylon-Insert Locknuts

Choose these locknuts for their adherence to strict military standards for material and construction.

Super-Corrosion-Resistant 316 Stainless
Steel Thin Nylon-Insert Locknuts

More corrosion resistant than 18-8 stainless steel locknuts, these have excellent resistance to chemicals and salt water.

High-Strength Steel Extra-Wide
Thin Nylon-Insert Locknuts

Comparable in strength to Grade 8 bolts, these locknuts are about three times stronger than low-strength steel extra-wide thin locknuts.

Low-Strength Steel Extra-Wide
Thin Nylon-Insert Locknuts

Use these locknuts for light duty fastening applications, such as securing access panels.

18-8 Stainless Steel Extra-Wide
Thin Nylon-Insert Locknuts

These locknuts have good chemical resistance.

Super-Corrosion-Resistant 316 Stainless
Steel Extra-Wide Thin Nylon-Insert Locknuts

More corrosion resistant than 18-8 stainless steel locknuts, these have excellent resistance to chemicals and salt water.

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.

Thin Steel-Insert Locknuts for Extreme Vibration

About two-thirds the height of standard steel-insert locknuts, use these locknuts in low-clearance applications or jam one against a hex nut to hold it in place.

Hex Panel Nuts

Stainless Steel Hex Panel Nuts

All of these stainless steel panel nuts have some chemical resistance.

Steel Hex Panel Nuts

These steel panel nuts are zinc plated for corrosion resistance.

Brass Hex Panel Nuts

Brass panel nuts are corrosion resistant in wet environments and electrically conductive.

About Nuts, Materials, and Finishes

Locknuts