Metric Fine Thread Nuts | McMaster-Carr

	System of Measurement System of Measurement

Inch

Metric

	Thread Size Thread Size

	Thread Pitch Thread Pitch

	Thread Type Thread Type

UNEF

Metric

	Material Material

Stainless Steel

Steel

Brass

	Nut Type Nut Type


Hex	Locknut

Flange

	Hex Nut Profile Hex Nut Profile


Standard	Thin

	Width Width

	Height Height

	Thread Spacing Thread Spacing

	Fastener Strength Grade/Class Fastener Strength Grade/Class


Class 04	Class 8

Class 10

	Finish Finish

Zinc Plated

Black Phosphate

Zinc Yellow-Chromate Plated

Black Oxide

	Specifications Met Specifications Met

DIN

ISO

JIS

	Thread Fit Thread Fit

Class 2B

Class 6H

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

DFARS Specialty Metals
Compliant

DFARS Specialty Metals
COTS-Exempt

	Flange Diameter Flange Diameter

17.5 mm

21 mm

25 mm

	Flange Thickness Flange Thickness

1.1 mm

1.2 mm

1.4 mm

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About Nuts, Materials, and Finishes

18-8 Stainless Steel Hex Nuts

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

Metric Fine-Thread 18-8 Stainless Steel Hex Nuts

JIS 18-8 Stainless Steel Hex Nuts

These metric nuts meet JIS (Japanese industrial Standard) B 1181.

Metric Fine-Thread Medium-Strength
Steel Hex Nuts—Class 8

JIS Medium-Strength Steel Hex Nuts

These metric nuts meet JIS (Japanese Industrial Standard) B 1181.

Metric Fine-Thread Low-Strength Steel Hex Nuts

Metric Fine-Thread Brass Hex Nuts

These brass nuts resist rusting from water and have closely spaced threads to prevent loosening from vibration.

18-8 Stainless Steel Thin Hex Nuts

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

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.

Metric Super-Corrosion-Resistant
316 Stainless Steel Thin Hex Nuts

These metric nuts are made of 316 stainless steel and half as tall as regular hex nuts—use them around chemicals and salt water when space is limited.

Low-Strength Steel Thin Hex Nuts

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

Metric Fine-Thread Medium-Strength
Steel Thin Hex Nuts

These nuts are half the height of standard hex nuts, and have closely spaced threads to prevent loosening from vibration. Half as strong as medium-strength steel nuts, they are often used for light-duty applications, such as fastening signs in place.

Metric Fine-Thread Medium-Strength
Steel Nylon-Insert Locknuts—Class 8

Get a grip on metric bolts exposed to vibration, wear, and changes in temperature. These metric locknuts have a nylon insert that holds onto bolts without damaging their threads.

Metric Fine-Thread High-Strength
Steel Nylon-Insert Locknuts—Class 10

Closely spaced metric threads prevent loosening from vibration. These Class 10 steel locknuts are 25% stronger than our medium-strength steel nylon-insert locknuts.

JIS High-Strength Steel Flange Nuts

These metric nuts meet JIS (Japanese Industrial Standard) B 1190.

JIS Medium-Strength Steel Flange Nuts

Made to Japanese Industrial Standards, these nuts fasten most Japanese machinery and equipment without a washer.