Class 4 Steel Hex Nuts | McMaster-Carr

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Class 04

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	Nut Type Nut Type


Hex	Square

	Material Material

Steel

	System of Measurement System of Measurement

Metric

	Thread Size Thread Size

	Thread Pitch Thread Pitch

	Height Height

	Width Width

	Finish Finish

Black Oxide

Blue Dyed

Zinc Plated

Zinc Yellow-Chromate Plated

	Hex Nut Profile Hex Nut Profile

	Thin

	Thread Direction Thread Direction


Right Hand	Left Hand

	Specifications Met Specifications Met

ASTM

DIN

ISO

	Thread Spacing Thread Spacing

Coarse

Fine

Extra Fine

	Thread Type Thread Type

Metric

	Thread Fit Thread Fit

Class 6H

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

DFARS Specialty Metals
COTS-Exempt

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

RoHS Compliant

RoHS Compliant with
Exemptions

	Drive Style Drive Style


External Hex	External Square

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

REACH Compliant

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About Nuts, Materials, and Finishes

Also known as jam nuts, these are about half the height of standard hex nuts. Use them in low-clearance applications or jam one against another nut to hold it in place. About half the strength of medium-strength steel thin nuts, use them for light duty fastening applications, such as securing access panels. Some of these screws meet ISO and DIN dimensional standards.

Nuts with fine and extra-fine thread spacing are less likely to loosen from vibration than nuts with coarse thread spacing.

Zinc-plated and zinc yellow-chromate plated steel nuts resist corrosion in wet environments.

The distinctive coloring on blue-dyed steel nuts makes them easy to distinguish from inch-size nuts.

Nuts that meet ISO 4035 (formerly DIN 439B) adhere to international standards for dimensions and material composition to ensure compatibility with other products and tools. Although the DIN 439B standards are no longer active, they are commonly referenced globally.

For technical drawings and 3-D models, click on a part number.

Metric

Thread
Size	Pitch, mm	Spacing	Wd., mm	Ht., mm	Specifications Met	Pkg. Qty.		Pkg.
Zinc-Plated Steel—Class 04
M2	0.4	Coarse	4	1.2	DIN 439B, ISO 4035	100	000000000	00000
M2.5	0.45	Coarse	5	1.6	DIN 439B, ISO 4035	100	000000000	0000
M3	0.5	Coarse	5.5	1.8	DIN 439B, ISO 4035	100	000000000	0000
M3.5	0.6	Coarse	6	2	DIN 439B, ISO 4035	100	000000000	00000
M4	0.7	Coarse	7	2.2	DIN 439B, ISO 4035	100	000000000	0000
M5	0.5	Fine	8	2.7	DIN 439B, ISO 4035	25	000000000	00000
M5	0.8	Coarse	8	2.7	DIN 439B, ISO 4035	100	000000000	0000
M6	0.75	Fine	10	3.2	DIN 439B, ISO 4035	25	000000000	00000
M6	1	Coarse	10	3.2	DIN 439B, ISO 4035	100	000000000	0000
M7	1	Coarse	11	3.5	DIN 439B, ISO 4035	100	000000000	00000
M8	1	Fine	13	4	DIN 439B, ISO 4035	100	000000000	0000
M8	1.25	Coarse	13	4	DIN 439B, ISO 4035	100	000000000	0000
M10	1	Extra Fine	17	5	DIN 439B, ISO 4035	100	000000000	00000
M10	1.25	Fine	17	5	DIN 439B, ISO 4035	100	000000000	00000
M10	1.5	Coarse	17	5	DIN 439B, ISO 4035	100	000000000	00000
M12	1	Extra Fine	19	6	DIN 439B, ISO 4035	25	000000000	0000
M12	1.25	Extra Fine	19	6	DIN 439B, ISO 4035	50	000000000	0000
M12	1.5	Fine	19	6	DIN 439B, ISO 4035	25	000000000	0000
M12	1.75	Coarse	19	6	DIN 439B, ISO 4035	50	000000000	00000
M14	1.25	Extra Fine	22	7	DIN 439B, ISO 4035	10	000000000	00000
M14	1.5	Fine	22	7	DIN 439B, ISO 4035	25	000000000	0000
M14	2	Coarse	22	7	DIN 439B, ISO 4035	25	000000000	00000
M16	1	Extra Fine	24	8	DIN 439B, ISO 4035	5	000000000	00000
M16	1.5	Fine	24	8	DIN 439B, ISO 4035	10	000000000	0000
M16	2	Coarse	24	8	DIN 439B, ISO 4035	25	000000000	00000
M18	1.5	Fine	27	9	DIN 439B, ISO 4035	10	000000000	0000
M18	2.5	Coarse	27	9	DIN 439B, ISO 4035	10	000000000	0000
M20	1.5	Extra Fine	30	10	DIN 439B, ISO 4035	10	000000000	0000
M20	2.5	Coarse	30	10	DIN 439B, ISO 4035	10	000000000	00000
M22	1.5	Fine	32	11	DIN 439B, ISO 4035	10	000000000	00000
M22	2.5	Coarse	32	11	DIN 439B, ISO 4035	1	000000000	0000
M24	1.5	Extra Fine	36	12	DIN 439B, ISO 4035	5	000000000	00000
M24	2	Fine	36	12	DIN 439B, ISO 4035	5	000000000	00000
M24	3	Coarse	36	12	DIN 439B, ISO 4035	5	000000000	00000
M27	2	Fine	41	13.5	DIN 439B, ISO 4035	1	000000000	0000
M27	3	Coarse	41	13.5	DIN 439B, ISO 4035	5	000000000	00000
M30	2	Fine	46	15	DIN 439B, ISO 4035	1	000000000	0000
M30	3.5	Coarse	46	15	DIN 439B, ISO 4035	1	000000000	0000
M36	3	Fine	55	18	DIN 439B, ISO 4035	1	000000000	00000
M36	4	Coarse	55	18	DIN 439B, ISO 4035	1	000000000	00000
M42	4.5	Coarse	65	21	DIN 439B, ISO 4035	1	000000000	00000
M48	5	Coarse	75	24	DIN 439B, ISO 4035	1	000000000	00000
Zinc Yellow-Chromate Plated Steel—Class 04
M4	0.7	Coarse	7	2.2	DIN 439B, ISO 4035	100	000000000	0000
M5	0.8	Coarse	8	2.7	DIN 439B, ISO 4035	100	000000000	0000
M6	1	Coarse	10	3.2	DIN 439B, ISO 4035	100	000000000	0000
M8	1	Fine	13	4	DIN 439B, ISO 4035	25	000000000	00000
M8	1.25	Coarse	13	4	DIN 439B, ISO 4035	100	000000000	00000
M10	1.25	Fine	17	5	DIN 439B, ISO 4035	25	000000000	0000
M10	1.5	Coarse	17	5	DIN 439B, ISO 4035	50	000000000	00000
M12	1.5	Fine	19	6	DIN 439B, ISO 4035	25	000000000	0000
M12	1.75	Coarse	19	6	DIN 439B, ISO 4035	50	000000000	00000
M14	1.5	Fine	22	7	DIN 439B, ISO 4035	25	000000000	0000
M14	2	Coarse	22	7	DIN 439B, ISO 4035	10	000000000	0000
M16	1.5	Fine	24	8	DIN 439B, ISO 4035	10	000000000	0000
M16	2	Coarse	24	8	DIN 439B, ISO 4035	25	000000000	00000
M18	1.5	Fine	27	9	DIN 439B, ISO 4035	5	000000000	0000
M20	1.5	Extra Fine	30	10	DIN 439B, ISO 4035	10	000000000	0000
M20	2.5	Coarse	30	10	DIN 439B, ISO 4035	10	000000000	00000
M22	1.5	Fine	32	11	DIN 439B, ISO 4035	5	000000000	0000
M30	2	Fine	46	15	DIN 439B, ISO 4035	1	000000000	0000
Blue Dyed Steel—Class 04
M6	1	Coarse	10	3.2	DIN 439B, ISO 4035	50	000000000	0000
M8	1.25	Coarse	13	4	DIN 439B, ISO 4035	50	000000000	0000
M10	1.5	Coarse	17	5	DIN 439B, ISO 4035	50	000000000	0000
M12	1.75	Coarse	19	6	DIN 439B, ISO 4035	25	000000000	0000
M16	2	Coarse	24	8	DIN 439B, ISO 4035	10	000000000	0000
M20	2.5	Coarse	30	10	DIN 439B, ISO 4035	10	000000000	00000
M24	3	Coarse	36	12	DIN 439B, ISO 4035	1	000000000	0000
Steel—Class 04
M4	0.7	Coarse	7	2.2	DIN 439B, ISO 4035	100	000000000	0000
M5	0.8	Coarse	8	2.7	DIN 439B, ISO 4035	100	000000000	0000
M6	1	Coarse	10	3.2	DIN 439B, ISO 4035	100	000000000	0000
M8	1	Fine	13	4	DIN 439B, ISO 4035	50	000000000	00000
M8	1.25	Coarse	13	4	DIN 439B, ISO 4035	100	000000000	0000
M10	1.25	Fine	17	5	DIN 439B, ISO 4035	50	000000000	00000
M10	1.5	Coarse	17	5	DIN 439B, ISO 4035	100	000000000	00000
M12	1.5	Fine	19	6	DIN 439B, ISO 4035	25	000000000	00000
M12	1.75	Coarse	19	6	DIN 439B, ISO 4035	50	000000000	0000
M14	1.5	Fine	22	7	DIN 439B, ISO 4035	50	000000000	00000
M16	1.5	Fine	24	8	DIN 439B, ISO 4035	25	000000000	00000
M16	2	Coarse	24	8	DIN 439B, ISO 4035	25	000000000	0000
M18	1.5	Fine	27	9	DIN 439B, ISO 4035	10	000000000	0000
M20	1.5	Extra Fine	30	10	DIN 439B, ISO 4035	10	000000000	0000
M20	2.5	Coarse	30	10	DIN 439B, ISO 4035	10	000000000	0000
M22	1.5	Fine	32	11	DIN 439B, ISO 4035	10	000000000	0000
M24	1.5	Extra Fine	36	12	DIN 439B, ISO 4035	5	000000000	00000
M24	2	Fine	36	12	DIN 439B, ISO 4035	5	000000000	00000
M24	3	Coarse	36	12	DIN 439B, ISO 4035	5	000000000	0000
M27	1.5	Extra Fine	41	13.5	DIN 439B, ISO 4035	1	000000000	00000
M27	2	Fine	41	13.5	DIN 439B, ISO 4035	1	000000000	0000
M30	2	Fine	46	15	DIN 439B, ISO 4035	1	000000000	0000
M33	2	Fine	50	16.5	DIN 439B, ISO 4035	1	000000000	00000
M36	3	Fine	55	18	DIN 439B, ISO 4035	1	000000000	00000
M36	4	Coarse	55	18	DIN 439B, ISO 4035	1	000000000	0000
M39	3	Fine	60	19.5	DIN 439B, ISO 4035	1	000000000	00000
M42	3	Fine	65	21	DIN 439B, ISO 4035	1	000000000	00000
M48	3	Fine	75	24	DIN 439B, ISO 4035	1	000000000	00000
M48	5	Coarse	75	24	DIN 439B, ISO 4035	1	000000000	00000
M45	3	Fine	70	22.5	DIN 439B, ISO 4035	1	000000000	00000
M52	3	Extra Fine	80	26	DIN 439B, ISO 4035	1	000000000	00000
M52	5	Coarse	80	26	DIN 439B, ISO 4035	1	000000000	00000

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. Also known as jam nuts, they are about half the height of standard hex nuts. Use them in low-clearance applications or jam one against another nut to hold it in place. About half the strength of medium-strength steel thin nuts, use them for light duty fastening applications, such as securing access panels.

Black-oxide steel nuts have a dark surface color and are mildly corrosion resistant in dry environments.

ISO 4035 (formerly DIN 439B) nuts are chamfered, so their edges are less sharp than DIN 936 nuts. This new ISO standard is functionally the same as the DIN standard it replaced, with slightly different tolerances for width.

For technical drawings and 3-D models, click on a part number.

Black-Oxide Steel—Class 04
Thread Size	Thread Pitch, mm	Wd.	Ht.	Specifications Met	Pkg. Qty.		Pkg.
M3	0.5	5.5mm	1.8mm	ASTM A108, DIN 439B, ISO 4035	1	000000000	00000
M5	0.5	8mm	2.7mm	ASTM A108, DIN 439B, ISO 4035	1	000000000	0000
M5	0.8	8mm	2.7mm	ASTM A108, DIN 439B, ISO 4035	1	000000000	0000
M6	0.75	10mm	3.2mm	ASTM A108, DIN 439B, ISO 4035	1	000000000	0000
M8	1	13mm	4mm	ASTM A108, DIN 439B, ISO 4035	1	000000000	0000
M8	1.25	13mm	4mm	ASTM A108, DIN 439B, ISO 4035	1	000000000	0000
M10	1	17mm	5mm	ASTM A108, DIN 439B, ISO 4035	1	000000000	0000
M10	1.5	17mm	5mm	ASTM A108, DIN 439B, ISO 4035	1	000000000	0000
M12	1.75	19mm	6mm	ASTM A108, DIN 439B, ISO 4035	1	000000000	0000
M14	1.5	22mm	7mm	ASTM A108, DIN 439B, ISO 4035	1	000000000	0000
M16	1.5	24mm	8mm	ASTM A108, DIN 439B, ISO 4035	1	000000000	0000
M16	2	24mm	8mm	ASTM A108, DIN 439B, ISO 4035	1	000000000	0000
M18	1.5	27mm	9mm	ASTM A108, DIN 439B, ISO 4035	1	000000000	0000
M18	2.5	27mm	9mm	ASTM A108, DIN 439B, ISO 4035	1	000000000	0000
M20	1.5	30mm	10mm	ASTM A108, DIN 439B, ISO 4035	1	000000000	00000
M20	2.5	30mm	10mm	ASTM A108, DIN 439B, ISO 4035	1	000000000	00000
M22	1.5	32mm	11mm	ASTM A108, DIN 439B, ISO 4035	1	000000000	00000
M22	2.5	32mm	11mm	ASTM A108, DIN 439B, ISO 4035	1	000000000	00000
M24	1.5	36mm	12mm	ASTM A108, DIN 439B, ISO 4035	1	000000000	00000
M27	1.5	41mm	13.5mm	ASTM A108, DIN 439B, ISO 4035	1	000000000	00000
M27	2	41mm	13.5mm	ASTM A108, DIN 439B, ISO 4035	1	000000000	00000
M30	1.5	46mm	15mm	ASTM A108, DIN 439B, ISO 4035	1	000000000	00000
M30	2	46mm	15mm	ASTM A108, DIN 439B, ISO 4035	1	000000000	00000
M30	3.5	46mm	15mm	ASTM A108, DIN 439B, ISO 4035	1	000000000	00000
M33	3.5	50mm	16.5mm	ASTM A108, DIN 439B, ISO 4035	1	000000000	00000

Metric Low-Strength Steel Thin Square Nuts

About half the strength and two-thirds the height of medium-strength steel square nuts, use these metric nuts in light duty, low-clearance applications. Also known as square jam nuts, they’re commonly jammed together to hold each other in place. Their flat, broad sides make them easy to grip with a wrench and keep them from rotating in channels and square holes. Compared to hex nuts, a greater area is in contact with the fastened surface. A zinc plating protects these nuts from corrosion in wet environments.

These nuts meet DIN 562, an international standard that signifies their material and dimensions are compatible with other products and tools.

For technical drawings and 3-D models, click on a part number.

Thread
Size	Pitch, mm	Wd., mm	Ht., mm	Specifications Met	Pkg. Qty.		Pkg.
Zinc-Plated Steel—Class 04
M3	0.5	5.5	1.8	DIN 562	100	000000000	00000
M4	0.7	7	2.2	DIN 562	100	000000000	0000
M5	0.8	8	2.7	DIN 562	100	000000000	00000
M6	1	10	3.2	DIN 562	100	000000000	00000
M8	1.25	13	4	DIN 562	50	000000000	00000
M10	1.5	17	5	DIN 562	25	000000000	00000