Black Oxide Jam Nuts | McMaster-Carr

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	System of Measurement System of Measurement

Inch

Metric

Pipe

	Thread Size Thread Size

	Material Material

Steel

Stainless Steel

	Finish Finish	Show

Black Oxide

	Finish Finish	Hide

Black Oxide

Black Phosphate

Black Ultra-Corrosion-
Resistant Coated

Black Zinc Plated

Blue Dyed

Cadmium Plated

Cadmium Yellow-
Chromate Plated

Zinc Yellow-Chromate
Plated

Zinc-Aluminum Coated

	Hex Nut Profile Hex Nut Profile


Thin	Extra-Wide Thin

	Height Height

	Nut Type Nut Type


Hex	Panel

Thumb	Flange

	Thread Direction Thread Direction


Right Hand	Left Hand

	Width Width

	Thumb Nut Profile Thumb Nut Profile


Flanged	Low

Standard

	Thread Spacing Thread Spacing

Coarse

Fine

Extra Fine

	Thread Pitch Thread Pitch

	Thread Type Thread Type

	Thread Fit Thread Fit

Class 2B

Class 6H

	Head Diameter Head Diameter

	Drive Style Drive Style

	External Hex

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

DFARS Specialty Metals
COTS-Exempt

DFARS Specialty Metals
Compliant

	Specifications Met Specifications Met

	Fastener Strength Grade/Class Fastener Strength Grade/Class

	Grade 2

	Thumb Nut Head Shape Thumb Nut Head Shape

	Round

	Panel Nut Shape Panel Nut Shape

	Hex

	Collar Diameter Collar Diameter

	Collar Height Collar Height

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About Nuts, Materials, and Finishes

Low-Strength Steel Thin Hex Nuts

These nuts should be used for light duty fastening applications, such as securing access panels.

Left-Hand Threaded Low-Strength Steel Thin Hex Nuts

These nuts tighten when turned to the left; once fastened, they resist loosening from counterclockwise motion. They’re Grade 2 steel, so they can be used for fastening panels and other light duty fastening applications

18-8 Stainless Steel Thin Hex Nuts

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

Metric 18-8 Stainless Steel Thin Hex Nuts

Useful in low-clearance applications, these metric nuts are roughly half the height of standard hex nuts, but aren’t as strong. All are 18-8 stainless steel, which is nearly as strong as steel but won’t rust in outdoor, washdown, and other corrosive environments.

Metric Fine-Thread 18-8 Stainless Steel Thin Hex Nuts

Made with fine-pitch threads, vibration is less likely to loosen these metric nuts than those with coarse-pitch threads since the threads sit closer together. Also called jam nuts, they are roughly half the height of standard hex nuts, so they’re good for applications with low clearance.