Metric Class 4 Nuts | McMaster-Carr

Filter by

Fastener Strength Grade/Class

Thread Type

System of Measurement

Thread Size

Thread Pitch

Nut Type

Height

Material

Finish

Hex Nut Profile

Thread Direction

Width

Specifications Met

Thread Spacing

Drive Style

DFARS Compliance

Thread Fit

REACH Compliance

RoHS Compliance

Color

Fastener Strength Rating

USMCA Qualifying

Forward

How can we improve?

132 Products

Thin-Profile Hex Nuts

About half the height of standard-profile nuts, these fit in spaces with low clearance. You can also use them as jam nuts by threading them against another hex nut to hold it in place.

Medium-Strength Steel

These Grade 5 or Class 04 nuts are your go-to for fastening most machinery and equipment. To avoid stripped threads during installation, make sure your screw has a comparable strength rating.

Zinc-Plated Steel—A step up from plain steel, the zinc plating withstands occasional exposure to moisture.

Zinc Yellow-Chromate-Plated Steel—With a more durable finish than clear zinc plating, these nuts are suitable for most wet and outdoor environments. However, they won't hold up to the harsh chemicals that stainless steel can.

Steel—Best for dry environments since moisture will cause these nuts to rust.

Blue Dyed Steel—These metric-sized nuts have a distinctive blue color, so you can easily tell them apart from inch nuts.

	Thread Size	Wd., mm	Ht., mm	Fastener Strength Grade/Class	Specs. Met	Pkg. Qty.		Pkg.
Zinc-Plated Steel


		M2 × 0.4 mm	4	1.2	ISO Class 04	DIN 439B, ISO 4035	100	000000000	00000
		M2.5 × 0.45 mm	5	1.6	ISO Class 04	DIN 439B, ISO 4035	100	000000000	0000
		M3 × 0.5 mm	5.5	1.8	ISO Class 04	DIN 439B, ISO 4035	100	000000000	0000
		M3.5 × 0.6 mm	6	2	ISO Class 04	DIN 439B, ISO 4035	100	000000000	00000
		M4 × 0.7 mm	7	2.2	ISO Class 04	DIN 439B, ISO 4035	100	000000000	0000
		M5 × 0.5 mm	8	2.7	ISO Class 04	DIN 439B, ISO 4035	25	000000000	00000
		M5 × 0.8 mm	8	2.7	ISO Class 04	DIN 439B, ISO 4035	100	000000000	0000
		M6 × 0.75 mm	10	3.2	ISO Class 04	DIN 439B, ISO 4035	25	000000000	00000
		M6 × 1 mm	10	3.2	ISO Class 04	DIN 439B, ISO 4035	100	000000000	0000
		M7 × 1 mm	11	3.5	ISO Class 04	DIN 439B, ISO 4035	100	000000000	00000
		M8 × 1 mm	13	4	ISO Class 04	DIN 439B, ISO 4035	100	000000000	0000
		M8 × 1.25 mm	13	4	ISO Class 04	DIN 439B, ISO 4035	100	000000000	0000
		M10 × 1 mm	17	5	ISO Class 04	DIN 439B, ISO 4035	100	000000000	00000
		M10 × 1.25 mm	17	5	ISO Class 04	DIN 439B, ISO 4035	100	000000000	00000
		M10 × 1.5 mm	17	5	ISO Class 04	DIN 439B, ISO 4035	100	000000000	00000
		M12 × 1 mm	19	6	ISO Class 04	DIN 439B, ISO 4035	25	000000000	0000
		M12 × 1.25 mm	19	6	ISO Class 04	DIN 439B, ISO 4035	50	000000000	0000
		M12 × 1.5 mm	19	6	ISO Class 04	DIN 439B, ISO 4035	25	000000000	0000
		M12 × 1.75 mm	19	6	ISO Class 04	DIN 439B, ISO 4035	50	000000000	00000
		M14 × 1.25 mm	22	7	ISO Class 04	DIN 439B, ISO 4035	10	000000000	00000
		M14 × 1.5 mm	22	7	ISO Class 04	DIN 439B, ISO 4035	25	000000000	0000
		M14 × 2 mm	22	7	ISO Class 04	DIN 439B, ISO 4035	25	000000000	00000
		M16 × 1 mm	24	8	ISO Class 04	DIN 439B, ISO 4035	5	000000000	00000
		M16 × 1.5 mm	24	8	ISO Class 04	DIN 439B, ISO 4035	10	000000000	0000
		M16 × 2 mm	24	8	ISO Class 04	DIN 439B, ISO 4035	25	000000000	00000
		M18 × 1.5 mm	27	9	ISO Class 04	DIN 439B, ISO 4035	10	000000000	0000
		M18 × 2.5 mm	27	9	ISO Class 04	DIN 439B, ISO 4035	10	000000000	0000
		M20 × 1.5 mm	30	10	ISO Class 04	DIN 439B, ISO 4035	10	000000000	0000
		M20 × 2.5 mm	30	10	ISO Class 04	DIN 439B, ISO 4035	10	000000000	00000
		M22 × 1.5 mm	32	11	ISO Class 04	DIN 439B, ISO 4035	10	000000000	00000
		M22 × 2.5 mm	32	11	ISO Class 04	DIN 439B, ISO 4035	1	000000000	0000
		M24 × 1.5 mm	36	12	ISO Class 04	DIN 439B, ISO 4035	5	000000000	00000
		M24 × 2 mm	36	12	ISO Class 04	DIN 439B, ISO 4035	5	000000000	00000
		M24 × 3 mm	36	12	ISO Class 04	DIN 439B, ISO 4035	5	000000000	00000
		M27 × 2 mm	41	13.5	ISO Class 04	DIN 439B, ISO 4035	1	000000000	0000
		M27 × 3 mm	41	13.5	ISO Class 04	DIN 439B, ISO 4035	5	000000000	00000
		M30 × 2 mm	46	15	ISO Class 04	DIN 439B, ISO 4035	1	000000000	0000
		M30 × 3.5 mm	46	15	ISO Class 04	DIN 439B, ISO 4035	1	000000000	0000
		M36 × 3 mm	55	18	ISO Class 04	DIN 439B, ISO 4035	1	000000000	00000
		M36 × 4 mm	55	18	ISO Class 04	DIN 439B, ISO 4035	1	000000000	00000
		M42 × 4.5 mm	65	21	ISO Class 04	DIN 439B, ISO 4035	1	000000000	00000
		M48 × 5 mm	75	24	ISO Class 04	DIN 439B, ISO 4035	1	000000000	00000

		Zinc Yellow-Chromate-Plated Steel


				M4 × 0.7 mm	7	2.2	ISO Class 04	DIN 439B, ISO 4035	100	000000000	0000
				M5 × 0.8 mm	8	2.7	ISO Class 04	DIN 439B, ISO 4035	100	000000000	0000
				M6 × 1 mm	10	3.2	ISO Class 04	DIN 439B, ISO 4035	100	000000000	0000
				M8 × 1 mm	13	4	ISO Class 04	DIN 439B, ISO 4035	25	000000000	00000
				M8 × 1.25 mm	13	4	ISO Class 04	DIN 439B, ISO 4035	100	000000000	00000
				M10 × 1.25 mm	17	5	ISO Class 04	DIN 439B, ISO 4035	25	000000000	0000
				M10 × 1.5 mm	17	5	ISO Class 04	DIN 439B, ISO 4035	50	000000000	00000
				M12 × 1.5 mm	19	6	ISO Class 04	DIN 439B, ISO 4035	25	000000000	0000
				M12 × 1.75 mm	19	6	ISO Class 04	DIN 439B, ISO 4035	50	000000000	00000
				M14 × 1.5 mm	22	7	ISO Class 04	DIN 439B, ISO 4035	25	000000000	0000
				M14 × 2 mm	22	7	ISO Class 04	DIN 439B, ISO 4035	10	000000000	0000
				M16 × 1.5 mm	24	8	ISO Class 04	DIN 439B, ISO 4035	10	000000000	0000
				M16 × 2 mm	24	8	ISO Class 04	DIN 439B, ISO 4035	25	000000000	00000
				M18 × 1.5 mm	27	9	ISO Class 04	DIN 439B, ISO 4035	5	000000000	0000
				M20 × 1.5 mm	30	10	ISO Class 04	DIN 439B, ISO 4035	10	000000000	0000
				M20 × 2.5 mm	30	10	ISO Class 04	DIN 439B, ISO 4035	10	000000000	00000
M22 × 1.5 mm				32	11	ISO Class 04	DIN 439B, ISO 4035	5	000000000	0000
M30 × 2 mm	46			15	ISO Class 04	DIN 439B, ISO 4035	1	000000000	0000

Steel


				M4 × 0.7 mm	7	2.2	ISO Class 04	DIN 439B, ISO 4035	100	000000000	0000
				M5 × 0.8 mm	8	2.7	ISO Class 04	DIN 439B, ISO 4035	100	000000000	0000
				M6 × 1 mm	10	3.2	ISO Class 04	DIN 439B, ISO 4035	100	000000000	0000
				M8 × 1 mm	13	4	ISO Class 04	DIN 439B, ISO 4035	50	000000000	00000
				M8 × 1.25 mm	13	4	ISO Class 04	DIN 439B, ISO 4035	100	000000000	0000
				M10 × 1.25 mm	17	5	ISO Class 04	DIN 439B, ISO 4035	50	000000000	00000
				M10 × 1.5 mm	17	5	ISO Class 04	DIN 439B, ISO 4035	100	000000000	00000
				M12 × 1.5 mm	19	6	ISO Class 04	DIN 439B, ISO 4035	25	000000000	00000
				M12 × 1.75 mm	19	6	ISO Class 04	DIN 439B, ISO 4035	50	000000000	0000
				M14 × 1.5 mm	22	7	ISO Class 04	DIN 439B, ISO 4035	50	000000000	00000
				M16 × 1.5 mm	24	8	ISO Class 04	DIN 439B, ISO 4035	25	000000000	00000
				M16 × 2 mm	24	8	ISO Class 04	DIN 439B, ISO 4035	25	000000000	0000
				M18 × 1.5 mm	27	9	ISO Class 04	DIN 439B, ISO 4035	10	000000000	0000
				M20 × 1.5 mm	30	10	ISO Class 04	DIN 439B, ISO 4035	10	000000000	0000
				M20 × 2.5 mm	30	10	ISO Class 04	DIN 439B, ISO 4035	10	000000000	0000
				M22 × 1.5 mm	32	11	ISO Class 04	DIN 439B, ISO 4035	10	000000000	0000
				M24 × 1.5 mm	36	12	ISO Class 04	DIN 439B, ISO 4035	5	000000000	00000
				M24 × 2 mm	36	12	ISO Class 04	DIN 439B, ISO 4035	5	000000000	00000
				M24 × 3 mm	36	12	ISO Class 04	DIN 439B, ISO 4035	5	000000000	0000
				M27 × 1.5 mm	41	13.5	ISO Class 04	DIN 439B, ISO 4035	1	000000000	00000
				M27 × 2 mm	41	13.5	ISO Class 04	DIN 439B, ISO 4035	1	000000000	0000
				M30 × 2 mm	46	15	ISO Class 04	DIN 439B, ISO 4035	1	000000000	0000
				M33 × 2 mm	50	16.5	ISO Class 04	DIN 439B, ISO 4035	1	000000000	00000
				M36 × 3 mm	55	18	ISO Class 04	DIN 439B, ISO 4035	1	000000000	00000
				M36 × 4 mm	55	18	ISO Class 04	DIN 439B, ISO 4035	1	000000000	0000
				M39 × 3 mm	60	19.5	ISO Class 04	DIN 439B, ISO 4035	1	000000000	00000
				M42 × 3 mm	65	21	ISO Class 04	DIN 439B, ISO 4035	1	000000000	00000
				M45 × 3 mm	70	22.5	ISO Class 04	DIN 439B, ISO 4035	1	000000000	00000
				M48 × 3 mm	75	24	ISO Class 04	DIN 439B, ISO 4035	1	000000000	00000
				M48 × 5 mm	75	24	ISO Class 04	DIN 439B, ISO 4035	1	000000000	00000
				M52 × 3 mm	80	26	ISO Class 04	DIN 439B, ISO 4035	1	000000000	00000
				M52 × 5 mm	80	26	ISO Class 04	DIN 439B, ISO 4035	1	000000000	00000

				Blue Dyed Steel


						M6 × 1 mm	10	3.2	ISO Class 04	DIN 439B, ISO 4035	50	000000000	0000
						M8 × 1.25 mm	13	4	ISO Class 04	DIN 439B, ISO 4035	50	000000000	0000
						M10 × 1.5 mm	17	5	ISO Class 04	DIN 439B, ISO 4035	50	000000000	00000
						M12 × 1.75 mm	19	6	ISO Class 04	DIN 439B, ISO 4035	25	000000000	0000
						M16 × 2 mm	24	8	ISO Class 04	DIN 439B, ISO 4035	10	000000000	0000
		M20 × 2.5 mm				30	10	ISO Class 04	DIN 439B, ISO 4035	10	000000000	00000
		M24 × 3 mm	36			12	ISO Class 04	DIN 439B, ISO 4035	1	000000000	0000

Left-Hand-Thread Thin-Profile Hex Nuts

These nuts tighten when turned to the left. Use them with left-hand rods and screws to prevent counterclockwise-moving parts from loosening. About half the height of standard-profile nuts, these fit in spaces with low clearance. You can also use them as jam nuts by threading them against another hex nut to hold it in place.

Medium-Strength Steel

These Grade 5 or Class 04 nuts are your go-to for fastening most machinery and equipment. To avoid stripped threads during installation, make sure your screw has a comparable strength rating.

Black-Oxide Steel—Typically chosen for their appearance, these nuts have a dark, matte coating to create a finished look. They offer minimal corrosion resistance, so they're best for dry environments.

	Wd., mm	Ht., mm	Fastener Strength Grade/Class	Specs. Met	Pkg. Qty.		Pkg.
Black-Oxide Steel


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

Medium-Strength Steel Thin-Profile Square Nuts

Made of ISO Class 04 steel and about two-thirds the height of standard steel square nuts, these nuts are suitable for most low-clearance fastening 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.

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

Zinc-Plated Steel—Zinc-plated steel square nuts resist corrosion in wet environments.

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

	Wd., mm	Ht., mm	Specs. Met	Pkg. Qty.		Pkg.
Black-Oxide Steel—ISO Class 04


	M3 × 0.5 mm	5.5	1.8	DIN 562	10	000000000	00000
	M4 × 0.7 mm	7	2.2	DIN 562	10	000000000	0000

	Zinc-Plated Steel—ISO Class 04


			M3 × 0.5 mm	5.5	1.8	DIN 562	100	000000000	0000
			M4 × 0.7 mm	7	2.2	DIN 562	100	000000000	0000
			M5 × 0.8 mm	8	2.7	DIN 562	100	000000000	00000
			M6 × 1 mm	10	3.2	DIN 562	100	000000000	00000
			M8 × 1.25 mm	13	4	DIN 562	50	000000000	00000
			M10 × 1.5 mm	17	5	DIN 562	25	000000000	00000