High Nuts | McMaster-Carr

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93 Products

About Hex Nuts

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

High-Profile Hex Nuts

Slightly taller than standard-profile hex nuts, these have a larger gripping area so your wrench or socket won't slip off as you tighten them. They're often used in vehicles and machinery where fasteners can be difficult to reach.

Medium-Strength Steel

These Grade 5 or Class 8 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.

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



	M6 × 1 mm	10	6	ISO Class 8	100	90725A043	000000
	M8 × 1.25 mm	13	8	ISO Class 8	50	90725A715	00000
	M10 × 1.5 mm	17	10	ISO Class 8	25	90725A720	00000
	M12 × 1.75 mm	19	12	ISO Class 8	10	90725A725	0000
	M14 × 2 mm	22	14	ISO Class 8	10	90725A730	00000
	M16 × 2 mm	24	16	ISO Class 8	10	90725A735	00000
	M20 × 2.5 mm	30	20	ISO Class 8	5	90725A740	00000
	M24 × 3 mm	36	24	ISO Class 8	1	90725A760	0000
	M30 × 3.5 mm	46	28	ISO Class 8	1	90725A770	0000

High-Strength Steel

Rated Grade 8, Grade C, or Class 10, these nuts are about 25% stronger than medium-strength steel nuts. They are commonly used to fasten components in valves, pumps, motors, and other high-stress applications. To avoid stripped threads during installation, make sure your screw has a comparable strength rating.

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

	Wd.	Ht.	Fastener Strength Grade/Class	Specs. Met	Pkg. Qty.		Pkg.
Steel



	3/8"-16	9/16"	17/32"	SAE Grade 8	SAE J995	1	90565A120	00000
	3/8"-24	9/16"	17/32"	SAE Grade 8	SAE J995	1	90565A360	00000
	7/16"-20	5/8"	39/64"	SAE Grade 8	SAE J995	25	90565A325	00000
	1/2"-13	3/4"	11/16"	SAE Grade 8	SAE J995	1	90565A140	0000
	1/2"-20	3/4"	11/16"	SAE Grade 8	SAE J995	25	90565A330	00000
	9/16"-18	7/8"	49/64"	SAE Grade 8	SAE J995	10	90565A333	0000
	5/8"-11	15/16"	27/32"	SAE Grade 8	SAE J995	1	90565A160	0000
	5/8"-18	15/16"	27/32"	SAE Grade 8	SAE J995	10	90565A335	00000
	3/4"-10	1 1/16"	1"	SAE Grade 8	SAE J995	1	90565A180	00000
	3/4"-16	1 1/8"	1"	SAE Grade 8	SAE J995	10	90565A340	00000


	7/8"-14	1 5/16"	1 5/32"	SAE Grade 8	SAE J995	5	90565A345	00000
	1"-8	1 1/2"	1 5/16"	SAE Grade 8	SAE J995	1	90565A220	00000
	1"-14	1 7/16"	1 5/16"	SAE Grade 8	SAE J995	5	90565A350	00000
	1 1/4"-12	1 13/16"	1 5/8"	SAE Grade 8	SAE J995	1	90565A355	00000
	1 1/2"-12	2 3/16"	2"	SAE Grade 8	SAE J995	1	90565A061	00000

Low-Strength Steel

Rated Grade 2, Class 6, or lower, these nuts are about half as strong as medium-strength nuts. They are suitable for light duty fastening applications, such as securing access panels. Use them with screws that have a similar strength rating to avoid stripping threads during installation.

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

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



	M2 × 0.4 mm	4	2	ISO Class 6	25	90725A010	000000
	M2.5 × 0.45 mm	5	2.5	ISO Class 6	25	90725A015	00000
	M3 × 0.5 mm	5.5	3	ISO Class 6	50	90725A020	0000
	M4 × 0.7 mm	7	4	ISO Class 6	50	90725A025	0000
	M5 × 0.8 mm	8	5	ISO Class 6	50	90725A030	0000

Corrosion-Resistant Stainless Steel

18-8 Stainless Steel—The choice for wet and outdoor environments, these nuts resist rust. However, they won't hold up to the harsh chemicals that 316 stainless steel can.

	Wd.	Ht.	Pkg. Qty.		Pkg.
18-8 Stainless Steel



	1/4"-20	7/16"	11/32"	1	91763A110	00000
	5/16"-18	1/2"	21/64"	1	91763A210	0000
	3/8"-16	9/16"	17/32"	1	91763A310	0000
	1/2"-13	3/4"	11/16"	1	91763A410	0000

High-Profile Nylon-Insert Locknuts

Slightly taller than standard-profile locknuts, these have a larger gripping area so your wrench or socket won't slip off as you tighten them. They're often used in vehicles and machinery where fasteners can be difficult to reach. The nylon insert grips the screw to prevent loosening from moderate vibration without damaging threads. However, the insert may become brittle if exposed to high temperatures. These locknuts are reusable a handful of times, but the holding power decreases with each use.

High-Strength Steel

Rated Grade 8, Grade C, or Class 10, these locknuts are about 25% stronger than medium-strength steel nuts. 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.

	Wd., mm	Ht., mm	Fastener Strength Grade/Class	Insert Max. Temp., ° F	Specs. Met	Pkg. Qty.		Pkg.
Zinc-Plated Steel



	M6 × 1 mm	10	8	ISO Class 10	220	DIN 982	50	97260A101	000000
	M8 × 1.25 mm	13	9.5	ISO Class 10	220	DIN 982	25	97260A102	0000
	M10 × 1.5 mm	17	11.5	ISO Class 10	220	DIN 982	25	97260A103	00000
	M12 × 1.75 mm	19	14	ISO Class 10	220	DIN 982	10	97260A104	00000
	M14 × 2 mm	22	16	ISO Class 10	220	DIN 982	10	97260A105	00000
	M16 × 2 mm	24	18	ISO Class 10	220	DIN 982	5	97260A106	00000
	M18 × 2.5 mm	27	20	ISO Class 10	220	DIN 982	5	97260A107	00000
	M20 × 2.5 mm	30	22	ISO Class 10	220	DIN 982	1	97260A108	0000
	M24 × 3 mm	36	28	ISO Class 10	220	DIN 982	1	97260A109	0000

Medium-Strength Steel

These Grade 5 or Class 8 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-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.

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

	Wd., mm	Ht., mm	Fastener Strength Grade/Class	Insert Max. Temp., ° F	Specs. Met	Pkg. Qty.		Pkg.
Zinc-Yellow-Chromate-Plated Steel



	M5 × 0.8 mm	8	6.3	ISO Class 8	220	DIN 982, ISO 7040	100	90576A825	000000
	M6 × 1 mm	10	8	ISO Class 8	220	DIN 982, ISO 7040	100	90576A826	00000
	M8 × 1.25 mm	13	9.5	ISO Class 8	220	DIN 982, ISO 7040	100	90576A827	00000
	M10 × 1.5 mm	17	11.5	ISO Class 8	220	DIN 982, ISO 7040	50	90576A828	00000
	M12 × 1.75 mm	19	14	ISO Class 8	220	DIN 982, ISO 7040	25	90576A829	00000
	M16 × 2 mm	24	18	ISO Class 8	220	DIN 982, ISO 7040	10	90576A831	00000
	M20 × 2.5 mm	32	22	ISO Class 8	220	DIN 982, ISO 7040	5	90576A832	00000
	M24 × 3 mm	36	28	ISO Class 8	220	DIN 982, ISO 7040	1	90576A833	0000


	Zinc-Plated Steel



			M4 × 0.7 mm	7	5.3	ISO Class 8	220	DIN 982, ISO 7040	100	97131A110	0000
			M5 × 0.8 mm	8	6.3	ISO Class 8	220	DIN 982, ISO 7040	100	97131A120	0000
			M6 × 1 mm	10	8	ISO Class 8	220	DIN 982, ISO 7040	100	97131A130	00000
			M8 × 1.25 mm	13	9.5	ISO Class 8	220	DIN 982, ISO 7040	50	97131A140	00000
			M10 × 1.5 mm	17	11.5	ISO Class 8	220	DIN 982, ISO 7040	25	97131A150	00000
			M12 × 1.75 mm	19	14	ISO Class 8	220	DIN 982, ISO 7040	25	97131A160	00000
			M14 × 1.5 mm	22	16	ISO Class 8	220	DIN 982, ISO 7040	10	97272A110	00000
			M14 × 2 mm	22	16	ISO Class 8	220	DIN 982, ISO 7040	10	97131A170	00000
			M16 × 1.5 mm	24	18	ISO Class 8	220	DIN 982, ISO 7040	5	97272A120	00000
			M16 × 2 mm	24	18	ISO Class 8	220	DIN 982, ISO 7040	10	97131A180	00000


			M18 × 2.5 mm	27	20	ISO Class 8	220	DIN 982, ISO 7040	5	97131A190	00000
			M20 × 1.5 mm	30	22	ISO Class 8	220	DIN 982, ISO 7040	1	97272A130	0000
			M20 × 2.5 mm	30	22	ISO Class 8	220	DIN 982, ISO 7040	1	97131A210	0000
			M22 × 2.5 mm	32	25	ISO Class 8	220	DIN 982, ISO 7040	1	97131A220	0000
			M24 × 3 mm	36	28	ISO Class 8	220	DIN 982, ISO 7040	1	97131A230	0000

Corrosion-Resistant Stainless Steel

18-8 Stainless Steel—The choice for wet and outdoor environments, these locknuts resist rust. However, they won't hold up to the harsh chemicals that 316 stainless steel can.

316 Stainless Steel—Our most corrosion-resistant nuts, these hold up in just about any environment. They won't degrade from exposure to weather, salt water, and most chemicals.

	Wd., mm	Ht., mm	Insert Max. Temp., ° F	Specs. Met	Pkg. Qty.		Pkg.
18-8 Stainless Steel



	M4 × 0.7 mm	7	5.3	220	DIN 982	25	93625A111	00000
	M5 × 0.8 mm	8	6.3	220	DIN 982	25	93625A112	0000
	M6 × 1 mm	10	8	220	DIN 982	25	93625A113	0000
	M8 × 1.25 mm	13	9.5	220	DIN 982	10	93625A114	0000
	M10 × 1.5 mm	17	11.5	220	DIN 982	10	93625A115	00000
	M12 × 1.75 mm	19	14	220	DIN 982	5	93625A116	0000
	M16 × 2 mm	24	18	220	DIN 982	1	93625A117	0000
	M20 × 2.5 mm	30	22	220	DIN 982	1	93625A118	0000


	316 Stainless Steel



			M4 × 0.7 mm	7	5.3	220	DIN 982	10	94205A151	0000
			M5 × 0.8 mm	8	6.3	220	DIN 982	10	94205A152	0000
			M6 × 1 mm	10	8	220	DIN 982	10	94205A153	0000
			M8 × 1.25 mm	13	9.5	220	DIN 982	10	94205A154	0000
			M10 × 1.5 mm	17	11.5	220	DIN 982	5	94205A155	0000
			M12 × 1.75 mm	19	14	220	DIN 982	5	94205A156	00000
			M16 × 2 mm	24	18	220	DIN 982	1	94205A157	0000
			M20 × 2.5 mm	30	22	220	DIN 982	1	94205A158	0000
			M24 × 3 mm	36	28	220	DIN 982	1	94205A159	00000

High-Profile Flange Nuts

30% taller than standard-profile nuts, these have a large gripping area so your wrench or socket won't slip off as you tighten them. They also engage more threads for extra gripping power. Nuts have a flange that distributes pressure evenly across the mounting surface without the need for a separate washer. They are ideal for securing screws in oversized or irregularly shaped holes since the flange covers a larger area than standard nuts. Also known as collar nuts.

High-Strength Steel

Rated Grade 8, Grade G, or Class 10, these are about 25% stronger than medium-strength steel nuts. They are commonly used to fasten components in valves, pumps, and motors. To avoid stripped threads during installation, make sure your screw has a comparable strength rating.

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

				Flange, mm
	Thread Size	Wd., mm	Ht., mm	Dia.	Thk.	Fastener Strength Grade/Class	Specs. Met	Pkg. Qty.		Pkg.
Steel



		M6 × 1 mm	10	9	14	3	ISO Class 10	DIN 6331	50	90360A111	000000
		M8 × 1.25 mm	13	12	18	3.5	ISO Class 10	DIN 6331	25	90360A112	00000
		M10 × 1.5 mm	16	15	22	4	ISO Class 10	DIN 6331	10	90360A113	00000
		M12 × 1.75 mm	18	18	25	4	ISO Class 10	DIN 6331	10	90360A114	00000
		M14 × 2 mm	22	21	28	4	ISO Class 10	DIN 6331	5	90360A115	00000
		M16 × 2 mm	24	24	31	5	ISO Class 10	DIN 6331	5	90360A117	00000
		M18 × 2.5 mm	27	27	34	5	ISO Class 10	DIN 6331	1	90360A118	0000
		M20 × 2.5 mm	30	30	37	6	ISO Class 10	DIN 6331	1	90360A119	0000
		M24 × 3 mm	36	36	45	6	ISO Class 10	DIN 6331	1	90360A121	00000
		M30 × 3.5 mm	46	45	58	8	ISO Class 10	DIN 6331	1	90360A122	00000


		M36 × 4 mm	55	54	68	10	ISO Class 10	DIN 6331	1	90360A123	00000