Class 10 Locknuts | McMaster-Carr

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149 Products

Nylon-Insert Locknuts

Versatile yet economical, these are the most commonly used locknuts. 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

Image of Product. Front orientation. Locknuts. Nylon-Insert Locknuts.

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.

Black-Corrosion-Resistant-Coated Steel—These nuts combine a finished appearance with the rust resistance of stainless steel. The coating has been tested to extreme standards, including 1,000 hours of salt spray resistance, to hold up in wet and outdoor environments. Also known as black luster.

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


	M4 × 0.7 mm	7	5	ISO Class 10	220	DIN 985	100	94645A101	000000
	M5 × 0.8 mm	8	5	ISO Class 10	220	DIN 985	100	94645A102	00000
	M6 × 1 mm	10	6	ISO Class 10	220	DIN 985	100	94645A205	00000
	M8 × 1 mm	13	8	ISO Class 10	220	DIN 985, ISO 10511	10	94645A111	00000
	M8 × 1.25 mm	13	8	ISO Class 10	220	DIN 985	50	94645A210	00000
	M10 × 1 mm	17	10	ISO Class 10	220	DIN 985, ISO 10511	25	94645A213	00000
	M10 × 1.25 mm	17	10	ISO Class 10	220	DIN 985, ISO 10511	10	94645A112	00000
	M10 × 1.5 mm	17	10	ISO Class 10	220	DIN 985	25	94645A220	00000
	M12 × 1.25 mm	19	12	ISO Class 10	220	DIN 985, ISO 10511	10	94645A113	00000
	M12 × 1.5 mm	19	12	ISO Class 10	220	DIN 985, ISO 10511	10	94645A229	00000
	M12 × 1.75 mm	19	12	ISO Class 10	220	DIN 985	10	94645A230	00000
	M14 × 1.5 mm	22	14	ISO Class 10	220	DIN 985, ISO 10511	5	94645A115	00000
	M14 × 2 mm	22	14	ISO Class 10	220	DIN 985	10	94645A240	00000
	M16 × 1.5 mm	24	16	ISO Class 10	220	DIN 985, ISO 10511	1	94645A116	0000
	M16 × 2 mm	24	16	ISO Class 10	220	DIN 985	10	94645A250	00000
	M18 × 1.5 mm	27	18	ISO Class 10	220	DIN 985, ISO 10511	1	94645A117	0000
	M18 × 2.5 mm	27	18.5	ISO Class 10	220	DIN 985	5	94645A260	00000
	M20 × 1.5 mm	30	20	ISO Class 10	220	DIN 985, ISO 10511	1	94645A118	0000
	M20 × 2 mm	30	20	ISO Class 10	220	DIN 985, ISO 10511	1	94645A119	00000
	M20 × 2.5 mm	30	20	ISO Class 10	220	DIN 985	5	94645A270	00000
	M22 × 1.5 mm	32	22	ISO Class 10	220	DIN 985, ISO 10511	1	94645A121	00000
	M22 × 2.5 mm	32	22	ISO Class 10	220	DIN 985	1	94645A310	0000
	M24 × 1.5 mm	36	24	ISO Class 10	220	DIN 985, ISO 10511	1	94645A122	00000
	M24 × 2 mm	36	24	ISO Class 10	220	DIN 985, ISO 10511	1	94645A123	00000
	M24 × 3 mm	36	24	ISO Class 10	220	DIN 985	1	94645A280	0000
	M27 × 3 mm	41	27	ISO Class 10	220	DIN 985	1	94645A320	00000
	M30 × 2 mm	46	30	ISO Class 10	220	DIN 985, ISO 10511	1	94645A124	00000
	M30 × 3.5 mm	46	30	ISO Class 10	220	DIN 985	1	94645A330	00000
	M33 × 3.5 mm	50	33	ISO Class 10	220	DIN 985	1	94645A340	00000
	M36 × 3 mm	55	36	ISO Class 10	220	DIN 985, ISO 10511	1	94645A125	00000
	M36 × 4 mm	55	36	ISO Class 10	220	DIN 985	1	94645A350	00000
	M39 × 4 mm	60	39	ISO Class 10	220	DIN 985	1	94645A360	00000
	M42 × 4.5 mm	65	42	ISO Class 10	220	DIN 985	1	94645A370	00000

	Black-Corrosion-Resistant-Coated Steel


			M4 × 0.7 mm	7	5	ISO Class 10	220	DIN 985	5	90237A110	00000
			M5 × 0.8 mm	8	5	ISO Class 10	220	DIN 985	5	90237A120	00000
			M6 × 1 mm	10	6	ISO Class 10	220	DIN 985	5	90237A130	00000
			M8 × 1.25 mm	13	8	ISO Class 10	220	DIN 985	5	90237A140	00000
			M10 × 1.5 mm	17	10	ISO Class 10	220	DIN 985	5	90237A150	00000
			M12 × 1.75 mm	19	12	ISO Class 10	220	DIN 985	1	90237A160	0000
			M14 × 2 mm	22	14	ISO Class 10	220	DIN 985	1	90237A170	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

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

Top-Lock Distorted-Thread Locknuts

Irregularly shaped threads at the top of these locknuts grip the screw for a stronger hold than nylon-insert locknuts. Although the threads prevent the nut from backing out due to vibration, they also increase the effort to install and remove. To get these nuts off, you may need special tools, such as an impact wrench or propane torch. Nuts are not reusable.

High-Strength Steel

Image of Product. Front orientation. Locknuts. Top-Lock Distorted-Thread Locknuts.

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.

Black-Phosphate-Coated Steel—The dark coating creates both a finished appearance and a barrier against rust that's comparable to zinc yellow-chromate plating.

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


		M6 × 1 mm	10	6	ISO Class 10	100	99183A250	000000
		M8 × 1 mm	13	8	ISO Class 10	10	99183A790	0000
		M8 × 1.25 mm	13	8	ISO Class 10	50	99183A260	00000
		M10 × 1.25 mm	17	10	ISO Class 10	10	99183A480	0000
		M10 × 1.5 mm	17	10	ISO Class 10	25	99183A270	00000
		M12 × 1.25 mm	19	12	ISO Class 10	5	99183A490	00000
		M12 × 1.5 mm	19	12	ISO Class 10	5	99183A810	00000
		M12 × 1.75 mm	19	12	ISO Class 10	10	99183A280	0000
		M14 × 1.5 mm	22	14	ISO Class 10	5	99183A820	00000
		M14 × 2 mm	22	14	ISO Class 10	10	99183A290	0000
		M16 × 1.5 mm	24	16	ISO Class 10	1	99183A830	0000
		M16 × 2 mm	24	16	ISO Class 10	10	99183A310	00000
		M18 × 2.5 mm	27	18	ISO Class 10	5	99183A320	00000
		M20 × 2.5 mm	30	20	ISO Class 10	5	99183A330	00000
		M24 × 3 mm	36	24	ISO Class 10	1	99183A340	0000

		Zinc-Plated Steel


				M5 × 0.8 mm	8	5.1	ISO Class 10	100	99183A110	0000
				M6 × 1 mm	10	6	ISO Class 10	100	99183A120	00000
				M8 × 1 mm	13	8	ISO Class 10	50	99183A360	00000
				M8 × 1.25 mm	13	8	ISO Class 10	50	99183A130	0000
				M10 × 1 mm	17	10	ISO Class 10	25	99183A370	00000
				M10 × 1.25 mm	17	10	ISO Class 10	10	99183A750	00000
				M10 × 1.5 mm	17	10	ISO Class 10	25	99183A140	00000
				M12 × 1.25 mm	19	12	ISO Class 10	25	99183A380	00000
				M12 × 1.5 mm	19	12	ISO Class 10	10	99183A760	00000
				M12 × 1.75 mm	19	12	ISO Class 10	25	99183A150	00000
				M14 × 1.5 mm	22	14	ISO Class 10	10	99183A390	0000
				M14 × 2 mm	22	14	ISO Class 10	10	99183A160	0000
				M16 × 1.5 mm	24	16	ISO Class 10	10	99183A410	00000
				M16 × 2 mm	24	16	ISO Class 10	10	99183A170	0000
				M18 × 1.5 mm	27	18	ISO Class 10	5	99183A420	0000
				M18 × 2.5 mm	27	18	ISO Class 10	5	99183A180	0000
				M20 × 1.5 mm	30	20	ISO Class 10	5	99183A430	00000
				M20 × 2.5 mm	30	20	ISO Class 10	5	99183A190	00000
				M22 × 1.5 mm	32	22	ISO Class 10	5	99183A440	00000
				M22 × 2.5 mm	32	22	ISO Class 10	5	99183A210	00000
				M24 × 1.5 mm	36	24	ISO Class 10	1	99183A450	0000
				M24 × 3 mm	36	24	ISO Class 10	1	99183A220	0000
				M27 × 3 mm	41	27	ISO Class 10	1	99183A230	0000
				M30 × 2 mm	46	30	ISO Class 10	1	99183A460	0000
				M30 × 3.5 mm	46	30	ISO Class 10	1	99183A240	0000

				Black-Phosphate-Coated Steel


						M5 × 0.8 mm	8	5.1	ISO Class 10	50	99183A510	00000
						M6 × 1 mm	10	6	ISO Class 10	25	99183A520	0000
						M8 × 1 mm	13	8	ISO Class 10	10	99183A530	0000
						M8 × 1.25 mm	13	8	ISO Class 10	25	99183A540	00000
						M10 × 1.25 mm	17	10	ISO Class 10	5	99183A560	00000
						M10 × 1.5 mm	17	10	ISO Class 10	10	99183A550	00000
						M12 × 1.25 mm	19	12	ISO Class 10	5	99183A570	00000
						M12 × 1.5 mm	19	12	ISO Class 10	5	99183A580	00000
						M12 × 1.75 mm	19	12	ISO Class 10	5	99183A590	0000
						M14 × 1.5 mm	22	14	ISO Class 10	5	99183A610	00000
						M14 × 2 mm	22	14	ISO Class 10	5	99183A620	00000
						M16 × 1.5 mm	24	16	ISO Class 10	1	99183A630	0000
						M16 × 2 mm	24	16	ISO Class 10	5	99183A640	00000
						M20 × 2.5 mm	30	20	ISO Class 10	1	99183A680	0000
M22 × 1.5 mm						33	22	ISO Class 10	1	99183A690	0000
M22 × 2.5 mm	33					22	ISO Class 10	1	99183A710	0000

Serrated Flange Nuts

Serrations bite into material for mild vibration resistance while the flange eliminates the need for a separate washer. These nuts are ideal for securing screws in oversized or irregularly shaped holes since the flange covers a larger area than standard nuts. You can use them again and again without sacrificing strength. However, the serrations may mar the surface of your material. Also known as collar nuts.

High-Strength Steel

Image of Product. Bottom orientation. Flange Nuts. Serrated Flange Nuts.

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.

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

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.
Zinc-Plated Steel


		M5 × 0.8 mm	8	5	11.8	1	ISO Class 10	DIN 6923	25	96595A106	00000
		M6 × 1 mm	10	6	14.2	1.1	ISO Class 10	DIN 6923	50	96595A101	00000
		M8 × 1.25 mm	13	8	17.9	1.2	ISO Class 10	DIN 6923	50	96595A102	00000
		M10 × 1.5 mm	15	10	21.8	1.5	ISO Class 10	DIN 6923	25	96595A103	00000
		M12 × 1.75 mm	18	12	26	1.8	ISO Class 10	DIN 6923	10	96595A104	0000
		M16 × 2 mm	24	16	34.5	2.4	ISO Class 10	DIN 6923	5	96595A105	00000
		M20 × 2.5 mm	30	20	42.8	3	ISO Class 10	DIN 6923	1	96595A107	0000

		Steel


				M5 × 0.8 mm	8	5	11.8	1	ISO Class 10	DIN 6923	25	90716A107	0000
				M6 × 1 mm	10	6	14.2	1.1	ISO Class 10	DIN 6923	50	90716A101	00000
				M8 × 1.25 mm	13	8	17.9	1.2	ISO Class 10	DIN 6923	50	90716A102	00000
				M10 × 1.5 mm	15	10	21.8	1.5	ISO Class 10	DIN 6923	25	90716A103	00000
				M12 × 1.75 mm	18	12	26	1.8	ISO Class 10	DIN 6923	10	90716A104	00000
				M16 × 2 mm	24	16	34.5	2.4	ISO Class 10	DIN 6923	5	90716A105	00000
				M20 × 2.5 mm	30	20	42.8	3	ISO Class 10	DIN 6923	1	90716A108	0000

Nylon-Insert Flange Nuts

A nylon insert grips the screw for a stronger hold than a serrated flange, without damaging threads or marring the surface of your material. However, the insert may become brittle if exposed to high temperatures. These nuts have a flange that distributes pressure evenly across the mounting surface, so you don't need 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. You can reuse them a handful of times, but their holding power will decrease with each use. Also known as collar nuts.

High-Strength Steel

Image of Product. Front orientation. Flange Nuts. Nylon-Insert Flange Nuts.

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

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


		M6 × 1 mm	10	9.1	14.2	1.1	ISO Class 10	DIN 6926	250	25	90427A110	000000
		M8 × 1.25 mm	13	11.1	17.9	1.2	ISO Class 10	DIN 6926	250	10	90427A120	0000
		M10 × 1.25 mm	15	13.5	21.8	1.5	ISO Class 10	DIN 6926	250	5	90427A140	00000
		M10 × 1.5 mm	15	13.5	21.8	1.5	ISO Class 10	DIN 6926	250	10	90427A130	00000
		M12 × 1.25 mm	18	16.1	26	1.8	ISO Class 10	DIN 6926	250	1	90427A160	0000
		M12 × 1.5 mm	18	16.1	26	1.8	ISO Class 10	DIN 6926	250	1	90427A170	0000
		M12 × 1.75 mm	18	16.1	26	1.8	ISO Class 10	DIN 6926	250	5	90427A150	00000
		M14 × 1.5 mm	21	18.2	29.9	2.1	ISO Class 10	DIN 6926	250	1	90427A190	0000
		M14 × 2 mm	21	18.2	29.9	2.1	ISO Class 10	DIN 6926	250	1	90427A180	0000
		M16 × 2 mm	24	20.3	34.5	2.4	ISO Class 10	DIN 6926	250	1	90427A210	0000

		Zinc-Yellow-Chromate-Plated Steel


				M6 × 1 mm	10	9.1	14.2	1.1	ISO Class 10	DIN 6926	250	50	99908A101	00000
				M8 × 1.25 mm	13	11	17.9	1.2	ISO Class 10	DIN 6926	250	50	99908A102	00000
				M10 × 1.5 mm	15	13.5	21.8	1.5	ISO Class 10	DIN 6926	250	25	99908A103	00000
				M12 × 1.75 mm	18	16.1	26	1.8	ISO Class 10	DIN 6926	250	25	99908A104	00000
				M14 × 2 mm	21	18.2	29.9	2.1	ISO Class 10	DIN 6926	250	10	99908A105	00000
				M16 × 2 mm	24	20.3	34.5	2.4	ISO Class 10	DIN 6926	250	5	99908A106	00000
				M20 × 2.5 mm	30	24.8	42.8	3	ISO Class 10	DIN 6926	250	1	99908A107	0000

Distorted-Thread Flange Nuts

The strongest hold of all the flange nuts we offer, these have irregularly shaped threads that grip the screw to resist loosening. The threads prevent the nut from backing out due to high vibration, but they also increase the effort to install and remove. To get these nuts off, you may need special tools, such as an impact wrench or propane torch, so they are not reusable. 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

Image of Product. Bottom orientation. Flange Nuts. Distorted-Thread Flange Nuts.

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

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

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


		M6 × 1 mm	10	7.3	14.2	1.1	ISO Class 10	DIN 6927, EN 1664, ISO 7044	50	3528N11	000000
		M8 × 1.25 mm	13	9.4	17.9	1.2	ISO Class 10	DIN 6927, EN 1664, ISO 7044	25	3528N12	00000
		M10 × 1.5 mm	15	11.4	21.8	1.5	ISO Class 10	DIN 6927, EN 1664, ISO 7044	10	3528N13	0000
		M12 × 1.75 mm	18	13.8	26	1.8	ISO Class 10	DIN 6927, EN 1664, ISO 7044	10	3528N14	00000
		M14 × 2 mm	21	15.9	29.9	2.1	ISO Class 10	DIN 6927, EN 1664, ISO 7044	5	3528N15	00000
		M16 × 2 mm	24	18.3	34.5	2.4	ISO Class 10	DIN 6927, EN 1664, ISO 7044	1	3528N16	0000
		M20 × 2.5 mm	30	22.4	42.8	3	ISO Class 10	DIN 6927, EN 1664, ISO 7044	1	3528N17	0000

		Black-Oxide Steel


				M6 × 1 mm	10	7.3	14.2	1.1	ISO Class 10	DIN 6927, EN 1664, ISO 7044	25	3528N21	0000
				M8 × 1.25 mm	13	9.4	17.9	1.2	ISO Class 10	DIN 6927, EN 1664, ISO 7044	10	3528N22	0000
				M10 × 1.5 mm	15	11.4	21.8	1.5	ISO Class 10	DIN 6927, EN 1664, ISO 7044	10	3528N23	0000
				M12 × 1.75 mm	18	13.8	26	1.8	ISO Class 10	DIN 6927, EN 1664, ISO 7044	10	3528N24	0000
				M14 × 2 mm	21	15.9	29.9	2.1	ISO Class 10	DIN 6927, EN 1664, ISO 7044	5	3528N25	0000
				M16 × 2 mm	24	18.3	34.5	2.4	ISO Class 10	DIN 6927, EN 1664, ISO 7044	1	3528N26	0000