Metric Class 4 Nuts | McMaster-Carr

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About Hex Nuts

Choose a hex nut with the right profile, material, and strength for your application.

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	Certificate Type	Pkg. Qty.		Pkg.
Zinc-Plated Steel



		M2 × 0.4 mm	4	1.2	Class 04	DIN 439B, ISO 4035	Material Certificate	100	90695A025	00000


		M2.5 × 0.45 mm	5	1.6	Class 04	DIN 439B, ISO 4035	—	100	90695A031	00000
		M3 × 0.5 mm	5.5	1.8	Class 04	DIN 439B, ISO 4035	—	100	90695A033	0000
		M3.5 × 0.6 mm	6	2	Class 04	DIN 439B, ISO 4035	—	100	90695A151	00000
		M4 × 0.7 mm	7	2.2	Class 04	DIN 439B, ISO 4035	—	100	90695A035	0000
		M5 × 0.5 mm	8	2.7	Class 04	DIN 439B, ISO 8675	Material Certificate	25	90326A231	00000
		M5 × 0.8 mm	8	2.7	Class 04	DIN 439B, ISO 4035	—	100	90695A037	0000
		M6 × 0.75 mm	10	3.2	Class 04	DIN 439B, ISO 8675	—	25	90326A201	00000
		M6 × 1 mm	10	3.2	Class 04	DIN 439B, ISO 4035	—	100	90695A038	0000
		M7 × 1 mm	11	3.5	Class 04	DIN 439B, ISO 4035	—	100	90695A152	00000
		M8 × 1 mm	13	4	Class 04	DIN 439B, ISO 8675	—	100	90326A105	00000


		M8 × 1.25 mm	13	4	Class 04	DIN 439B, ISO 4035	Material Certificate	100	90695A040	0000
		M10 × 1 mm	17	5	Class 04	DIN 439B, ISO 4035	—	100	90326A110	00000
		M10 × 1.25 mm	17	5	Class 04	DIN 439B, ISO 8675	—	100	90326A115	00000
		M10 × 1.5 mm	17	5	Class 04	DIN 439B, ISO 4035	Material Certificate	100	90695A041	00000
		M12 × 1 mm	19	6	Class 04	DIN 439B, ISO 4035	Material Certificate	25	90326A232	00000
		M12 × 1.25 mm	19	6	Class 04	DIN 439B, ISO 4035	—	50	90326A120	00000
		M12 × 1.5 mm	19	6	Class 04	DIN 439B, ISO 8675	—	25	90326A125	00000
		M12 × 1.75 mm	19	6	Class 04	DIN 439B, ISO 4035	Material Certificate	50	90695A115	00000
		M14 × 1.25 mm	22	7	Class 04	DIN 439B, ISO 4035	—	10	90326A202	00000
		M14 × 1.5 mm	22	7	Class 04	DIN 439B, ISO 8675	—	25	90326A130	00000


		M14 × 2 mm	22	7	Class 04	DIN 439B, ISO 4035	—	25	90695A120	00000
		M16 × 1 mm	24	8	Class 04	DIN 439B, ISO 4035	—	5	90326A203	00000
		M16 × 1.5 mm	24	8	Class 04	DIN 439B, ISO 8675	—	10	90326A135	00000
		M16 × 2 mm	24	8	Class 04	DIN 439B, ISO 4035	—	25	90695A125	00000
		M18 × 1.5 mm	27	9	Class 04	DIN 439B, ISO 8675	—	10	90326A140	00000
		M18 × 2.5 mm	27	9	Class 04	DIN 439B, ISO 4035	—	10	90695A153	00000
		M20 × 1.5 mm	30	10	Class 04	DIN 439B, ISO 4035	—	10	90326A145	0000
		M20 × 2.5 mm	30	10	Class 04	DIN 439B, ISO 4035	Material Certificate	10	90695A130	00000
		M22 × 1.5 mm	32	11	Class 04	DIN 439B, ISO 8675	—	10	90326A150	00000
		M22 × 2.5 mm	32	11	Class 04	DIN 439B, ISO 4035	—	1	90695A154	0000


		M24 × 1.5 mm	36	12	Class 04	DIN 439B, ISO 4035	—	5	90326A155	00000
		M24 × 2 mm	36	12	Class 04	DIN 439B, ISO 8675	—	5	90326A204	00000
		M24 × 3 mm	36	12	Class 04	DIN 439B, ISO 4035	—	5	90695A135	00000
		M27 × 2 mm	41	13.5	Class 04	DIN 439B, ISO 8675	—	1	90326A205	00000
		M27 × 3 mm	41	13.5	Class 04	DIN 439B, ISO 4035	—	5	90695A155	00000
		M30 × 2 mm	46	15	Class 04	DIN 439B, ISO 8675	—	1	90326A206	0000
		M30 × 3.5 mm	46	15	Class 04	DIN 439B, ISO 4035	Material Certificate	1	90695A141	0000
		M36 × 3 mm	55	18	Class 04	DIN 439B, ISO 8675	—	1	90326A207	00000
		M36 × 4 mm	55	18	Class 04	DIN 439B, ISO 4035	—	1	90695A149	00000
		M42 × 4.5 mm	65	21	Class 04	DIN 439B, ISO 4035	—	1	90695A156	00000


		M48 × 5 mm	75	24	Class 04	DIN 439B, ISO 4035	—	1	90695A157	00000


		Zinc-Yellow-Chromate-Plated Steel



				M4 × 0.7 mm	7	2.2	Class 04	DIN 439B, ISO 4035	—	100	95027A111	0000


M5 × 0.8 mm				8	2.7	Class 04	DIN 439B, ISO 4035	—	100	95027A112	0000
M6 × 1 mm	10			3.2	Class 04	DIN 439B, ISO 4035	—	100	95027A113	0000
M8 × 1 mm	13			4	Class 04	DIN 439B, ISO 8675	Material Certificate	25	93737A111	00000
M8 × 1.25 mm	13			4	Class 04	DIN 439B, ISO 4035	—	100	95027A114	00000
M10 × 1.25 mm	17			5	Class 04	DIN 439B, ISO 8675	—	25	93737A112	0000
M10 × 1.5 mm	17			5	Class 04	DIN 439B, ISO 4035	—	50	95027A115	00000
M12 × 1.5 mm	19			6	Class 04	DIN 439B, ISO 8675	—	25	93737A113	0000
M12 × 1.75 mm	19			6	Class 04	DIN 439B, ISO 4035	—	50	95027A116	00000
M14 × 1.5 mm	22			7	Class 04	DIN 439B, ISO 8675	—	25	93737A114	00000
M14 × 2 mm	22			7	Class 04	DIN 439B, ISO 4035	—	10	95027A117	0000


M16 × 1.5 mm	24			8	Class 04	DIN 439B, ISO 8675	—	10	93737A115	0000
M16 × 2 mm	24			8	Class 04	DIN 439B, ISO 4035	Material Certificate	25	95027A118	00000
M18 × 1.5 mm	27			9	Class 04	DIN 439B, ISO 8675	Material Certificate	5	93737A116	0000
M20 × 1.5 mm	30			10	Class 04	DIN 439B, ISO 4035	—	10	93737A117	0000
M20 × 2.5 mm	30			10	Class 04	DIN 439B, ISO 4035	—	10	95027A119	00000
M22 × 1.5 mm	32			11	Class 04	DIN 439B, ISO 8675	—	5	93737A118	0000
M30 × 2 mm	46			15	Class 04	DIN 439B, ISO 8675	—	1	93737A119	0000


Steel



				M4 × 0.7 mm	7	2.2	Class 04	DIN 439B, ISO 4035	—	100	94168A111	0000


				M5 × 0.8 mm	8	2.7	Class 04	DIN 439B, ISO 4035	—	100	94168A112	0000
				M6 × 1 mm	10	3.2	Class 04	DIN 439B, ISO 4035	—	100	94168A113	0000
				M8 × 1 mm	13	4	Class 04	DIN 439B, ISO 8675	—	50	90326A208	0000
				M8 × 1.25 mm	13	4	Class 04	DIN 439B, ISO 4035	—	100	94168A114	0000
				M10 × 1.25 mm	17	5	Class 04	DIN 439B, ISO 8675	—	50	90326A209	00000
				M10 × 1.5 mm	17	5	Class 04	DIN 439B, ISO 4035	—	100	94168A115	00000
				M12 × 1.5 mm	19	6	Class 04	DIN 439B, ISO 8675	—	25	90326A211	0000
				M12 × 1.75 mm	19	6	Class 04	DIN 439B, ISO 4035	—	50	94168A116	00000
				M14 × 1.5 mm	22	7	Class 04	DIN 439B, ISO 8675	—	50	90326A212	00000
				M16 × 1.5 mm	24	8	Class 04	DIN 439B, ISO 8675	—	25	90326A213	00000


				M16 × 2 mm	24	8	Class 04	DIN 439B, ISO 4035	—	25	94168A118	0000
				M18 × 1.5 mm	27	9	Class 04	DIN 439B, ISO 8675	—	10	90326A214	0000
				M20 × 1.5 mm	30	10	Class 04	DIN 439B, ISO 4035	Material Certificate	10	90326A215	0000
				M20 × 2.5 mm	30	10	Class 04	DIN 439B, ISO 4035	—	10	94168A119	0000
				M22 × 1.5 mm	32	11	Class 04	DIN 439B, ISO 8675	—	10	90326A216	00000
				M24 × 1.5 mm	36	12	Class 04	DIN 439B, ISO 4035	—	5	90326A217	00000
				M24 × 2 mm	36	12	Class 04	DIN 439B, ISO 8675	—	5	90326A218	00000
				M24 × 3 mm	36	12	Class 04	DIN 439B, ISO 4035	—	5	94168A122	0000
				M27 × 1.5 mm	41	13.5	Class 04	DIN 439B, ISO 4035	—	1	90326A219	00000
				M27 × 2 mm	41	13.5	Class 04	DIN 439B, ISO 8675	—	1	90326A221	0000


				M30 × 2 mm	46	15	Class 04	DIN 439B, ISO 8675	—	1	90326A222	0000
				M33 × 2 mm	50	16.5	Class 04	DIN 439B, ISO 8675	—	1	90326A223	00000
				M36 × 3 mm	55	18	Class 04	DIN 439B, ISO 8675	Material Certificate	1	90326A224	00000
				M36 × 4 mm	55	18	Class 04	DIN 439B, ISO 4035	—	1	94168A124	0000
				M39 × 3 mm	60	19.5	Class 04	DIN 439B, ISO 8675	—	1	90326A225	00000
				M42 × 3 mm	65	21	Class 04	DIN 439B, ISO 8675	—	1	90326A226	00000
				M45 × 3 mm	70	22.5	Class 04	DIN 439B, ISO 8675	—	1	90326A227	00000
		M48 × 3 mm		75	24	Class 04	DIN 439B, ISO 8675	—	1	90326A228	00000
		M48 × 5 mm	75	24	Class 04	DIN 439B, ISO 4035	—	1	94168A127	00000
		M52 × 3 mm	80	26	Class 04	DIN 439B, ISO 4035	—	1	90326A229	00000


		M52 × 5 mm	80	26	Class 04	DIN 439B, ISO 4035	—	1	94168A128	00000


		Blue Dyed Steel



				M6 × 1 mm	10	3.2	Class 04	DIN 439B, ISO 4035	—	50	96276A110	0000


				M8 × 1.25 mm	13	4	Class 04	DIN 439B, ISO 4035	—	50	96276A210	0000
				M10 × 1.5 mm	17	5	Class 04	DIN 439B, ISO 4035	—	50	96276A310	00000
				M12 × 1.75 mm	19	6	Class 04	DIN 439B, ISO 4035	—	25	96276A410	0000
				M16 × 2 mm	24	8	Class 04	DIN 439B, ISO 4035	—	10	96276A610	0000
				M20 × 2.5 mm	30	10	Class 04	DIN 439B, ISO 4035	—	10	96276A810	00000
				M24 × 3 mm	36	12	Class 04	DIN 439B, ISO 4035	—	1	96276A910	0000

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—Class 04



	M3 × 0.5 mm	5.5	1.8	DIN 562	10	97259A111	00000


	M4 × 0.7 mm	7	2.2	DIN 562	10	97259A112	0000


	Zinc-Plated Steel—Class 04



			M3 × 0.5 mm	5.5	1.8	DIN 562	100	97259A101	0000


			M4 × 0.7 mm	7	2.2	DIN 562	100	97259A102	00000
			M5 × 0.8 mm	8	2.7	DIN 562	100	97259A103	0000
			M6 × 1 mm	10	3.2	DIN 562	100	97259A104	00000
			M8 × 1.25 mm	13	4	DIN 562	50	97259A105	00000
			M10 × 1.5 mm	17	5	DIN 562	25	97259A106	00000

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	Certificate Type	Pkg. Qty.		Pkg.
Black-Oxide Steel



	M3 × 0.5 mm	5.5	1.8	Class 04	ASTM A108, DIN 439B, ISO 4035	Material Certificate	1	90519A811	00000


	M5 × 0.5 mm	8	2.7	Class 04	ASTM A108, DIN 439B, ISO 8675	Material Certificate	1	90519A831	0000
	M5 × 0.8 mm	8	2.7	Class 04	ASTM A108, DIN 439B, ISO 4035	Material Certificate	1	90519A813	0000
	M6 × 0.75 mm	10	3.2	Class 04	ASTM A108, DIN 439B, ISO 8675	—	1	90519A832	0000
	M8 × 1 mm	13	4	Class 04	ASTM A108, DIN 439B, ISO 8675	—	1	90519A833	0000
	M8 × 1.25 mm	13	4	Class 04	ASTM A108, DIN 439B, ISO 4035	—	1	90519A815	0000
	M10 × 1 mm	17	5	Class 04	ASTM A108, DIN 439B, ISO 4035	Material Certificate	1	90519A834	0000
	M10 × 1.5 mm	17	5	Class 04	ASTM A108, DIN 439B, ISO 4035	Material Certificate	1	90519A816	0000
	M12 × 1.75 mm	19	6	Class 04	ASTM A108, DIN 439B, ISO 4035	—	1	90519A817	0000
	M14 × 1.5 mm	22	7	Class 04	ASTM A108, DIN 439B, ISO 8675	—	1	90519A836	0000
	M16 × 1.5 mm	24	8	Class 04	ASTM A108, DIN 439B, ISO 8675	—	1	90519A837	0000


	M16 × 2 mm	24	8	Class 04	ASTM A108, DIN 439B, ISO 4035	Material Certificate	1	90519A819	0000
	M18 × 1.5 mm	27	9	Class 04	ASTM A108, DIN 439B, ISO 8675	Material Certificate	1	90519A838	0000
	M18 × 2.5 mm	27	9	Class 04	ASTM A108, DIN 439B, ISO 4035	Material Certificate	1	90519A821	0000
	M20 × 1.5 mm	30	10	Class 04	ASTM A108, DIN 439B, ISO 4035	Material Certificate	1	90519A839	00000
	M20 × 2.5 mm	30	10	Class 04	ASTM A108, DIN 439B, ISO 4035	—	1	90519A822	00000
	M22 × 1.5 mm	32	11	Class 04	ASTM A108, DIN 439B, ISO 8675	—	1	90519A841	00000
	M22 × 2.5 mm	32	11	Class 04	ASTM A108, DIN 439B, ISO 4035	—	1	90519A823	00000
	M24 × 1.5 mm	36	12	Class 04	ASTM A108, DIN 439B, ISO 4035	—	1	90519A842	00000
	M27 × 1.5 mm	41	13.5	Class 04	ASTM A108, DIN 439B, ISO 4035	Material Certificate	1	90519A844	00000
	M27 × 2 mm	41	13.5	Class 04	ASTM A108, DIN 439B, ISO 8675	Material Certificate	1	90519A843	00000


	M30 × 1.5 mm	46	15	Class 04	ASTM A108, DIN 439B, ISO 4035	—	1	90519A846	00000
	M30 × 2 mm	46	15	Class 04	ASTM A108, DIN 439B, ISO 8675	—	1	90519A845	00000
	M30 × 3.5 mm	46	15	Class 04	ASTM A108, DIN 439B, ISO 4035	Material Certificate	1	90519A826	00000
	M33 × 3.5 mm	50	16.5	Class 04	ASTM A108, DIN 439B, ISO 4035	Material Certificate	1	90519A827	00000