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

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 Phosphate

Black Ultra-Corrosion-
Resistant Coated

Zinc Yellow-Chromate Plated

	Height Height

	Width Width

	Thread Direction Thread Direction

	Right Hand

	Thread Spacing Thread Spacing

Coarse

Fine

Extra Fine

	Fastener Strength Grade/Class Fastener Strength Grade/Class


Grade 5	Grade 8

Grade C

	Thread Fit Thread Fit

Class 2B

Class 3B

	Thread Type Thread Type

	Pipe Size Pipe Size

1/8

	Insert Maximum Temperature Insert Maximum Temperature

220° F

250° F

Not Rated

	Drive Style Drive Style

	External Hex

	Panel Nut Shape Panel Nut Shape

	Hex

	Specifications Met Specifications Met

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292 Products

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.

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.

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

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

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.

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.