Class 10 Locknuts | McMaster-Carr

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160 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 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—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.

Large Pack—Priced at least 30% lower per locknut than small packs.

							Small Pack			Large Pack
	Thread Size	Wd., mm	Ht., mm	Fastener Strength Grade/Class	Insert Max. Temp., ° F	Certificate Type	Pkg. Qty.		Pkg.	Pkg. Qty.		Pkg.
Zinc-Plated Steel



		M4 × 0.7 mm	7	5	Class 10	185	Material Certificate	100	94645A101	000000	2,000	94645A208	0000000


		M5 × 0.8 mm	8	5	Class 10	185	Material Certificate	100	94645A102	00000	2,000	94645A212	000000
		M6 × 1 mm	10	6	Class 10	185	Material Certificate	100	94645A205	00000	2,000	94645A214	000000
		M8 × 1.25 mm	13	8	Class 10	185	Material Certificate	50	94645A210	00000	1,000	94645A209	000000
		M8 × 1 mm	13	8	Class 10	185	Material Certificate	10	94645A111	00000	—	———	0
		M10 × 1.5 mm	17	10	Class 10	185	Material Certificate	25	94645A220	00000	500	94645A216	000000
		M10 × 1.25 mm	17	10	Class 10	185	Material Certificate	10	94645A112	00000	—	———	0
		M10 × 1 mm	17	10	Class 10	185	Material Certificate	25	94645A213	0000	—	———	0
		M12 × 1.75 mm	19	12	Class 10	185	Material Certificate	10	94645A230	00000	200	94645A217	000000
		M12 × 1.5 mm	19	12	Class 10	185	Material Certificate	10	94645A229	0000	—	———	0
		M12 × 1.25 mm	19	12	Class 10	185	Material Certificate	10	94645A113	00000	—	———	0


		M14 × 2 mm	22	14	Class 10	185	Material Certificate	10	94645A240	00000	200	94645A218	000000
		M14 × 1.5 mm	22	14	Class 10	185	Material Certificate	5	94645A115	00000	—	———	0
		M16 × 2 mm	24	16	Class 10	185	Material Certificate	10	94645A250	00000	200	94645A219	000000
		M16 × 1.5 mm	24	16	Class 10	185	Material Certificate	1	94645A116	0000	—	———	0
		M18 × 2.5 mm	27	18.5	Class 10	185	Material Certificate	5	94645A260	00000	100	94645A221	000000
		M18 × 1.5 mm	27	18	Class 10	185	Material Certificate	1	94645A117	0000	—	———	0
		M20 × 2.5 mm	30	20	Class 10	185	Material Certificate	5	94645A270	00000	100	94645A222	000000
		M20 × 2 mm	30	20	Class 10	185	Material Certificate	1	94645A119	00000	—	———	0
		M20 × 1.5 mm	30	20	Class 10	185	Material Certificate	1	94645A118	0000	—	———	0
		M22 × 2.5 mm	32	22	Class 10	185	—	1	94645A310	0000	—	———	0


		M22 × 1.5 mm	32	22	Class 10	185	Material Certificate	1	94645A121	00000	—	———	0
		M24 × 3 mm	36	24	Class 10	185	Material Certificate	1	94645A280	0000	50	94645A223	000000
		M24 × 2 mm	36	24	Class 10	185	Material Certificate	1	94645A123	00000	—	———	0
		M24 × 1.5 mm	36	24	Class 10	185	Material Certificate	1	94645A122	00000	—	———	0
		M27 × 3 mm	41	27	Class 10	185	—	1	94645A320	00000	—	———	0
		M30 × 3.5 mm	46	30	Class 10	185	Material Certificate	1	94645A330	00000	—	———	0
		M30 × 2 mm	46	30	Class 10	185	Material Certificate	1	94645A124	00000	—	———	0
		M33 × 3.5 mm	50	33	Class 10	185	—	1	94645A340	00000	—	———	0
		M36 × 4 mm	55	36	Class 10	185	Material Certificate	1	94645A350	00000	—	———	0
		M36 × 3 mm	55	36	Class 10	185	Material Certificate	1	94645A125	00000	—	———	0


		M39 × 4 mm	60	39	Class 10	185	Material Certificate	1	94645A360	00000	—	———	0
		M42 × 4.5 mm	65	42	Class 10	185	Material Certificate	1	94645A370	00000	—	———	0


		Black-Corrosion-Resistant-Coated Steel



				M4 × 0.7 mm	7	5	Class 10	185	—	5	90237A110	00000	—	———	0


				M5 × 0.8 mm	8	5	Class 10	185	—	5	90237A120	00000	—	———	0
				M6 × 1 mm	10	6	Class 10	185	—	5	90237A130	00000	—	———	0
				M8 × 1.25 mm	13	8	Class 10	185	—	5	90237A140	00000	—	———	0
				M10 × 1.5 mm	17	10	Class 10	185	—	5	90237A150	00000	—	———	0
				M12 × 1.75 mm	19	12	Class 10	185	—	1	90237A160	0000	—	———	0
				M14 × 2 mm	22	14	Class 10	185	—	1	90237A170	0000	—	———	0

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.

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.

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.

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



		M6 × 1 mm	10	9.1	14.2	1.1	Class 10	DIN 6926	Material Certificate	250	25	90427A110	000000


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


		Zinc-Yellow-Chromate-Plated Steel



				M6 × 1 mm	10	9.1	14.2	1.1	Class 10	DIN 6926	Material Certificate	250	50	99908A101	00000


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

Rated Grade 8 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-Phosphate-Coated Steel—The dark coating creates both a finished appearance and a barrier against rust that withstands occasional exposure to moisture.

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



		M6 × 1 mm	10	6	Class 10	Material Certificate	100	99183A250	000000


		M8 × 1.25 mm	13	8	Class 10	—	50	99183A260	00000
		M8 × 1 mm	13	8	Class 10	—	10	99183A790	0000
		M10 × 1.5 mm	17	10	Class 10	Material Certificate	25	99183A270	00000
		M10 × 1.25 mm	17	10	Class 10	—	10	99183A480	0000
		M12 × 1.75 mm	19	12	Class 10	Material Certificate	10	99183A280	0000
		M12 × 1.5 mm	19	12	Class 10	Material Certificate	5	99183A810	00000
		M12 × 1.25 mm	19	12	Class 10	—	5	99183A490	00000
		M14 × 2 mm	22	14	Class 10	—	10	99183A290	0000
		M14 × 1.5 mm	22	14	Class 10	—	5	99183A820	00000
		M16 × 2 mm	24	16	Class 10	—	10	99183A310	00000


		M16 × 1.5 mm	24	16	Class 10	—	1	99183A830	0000
		M18 × 2.5 mm	27	18	Class 10	—	5	99183A320	00000
		M20 × 2.5 mm	30	20	Class 10	—	5	99183A330	00000
		M24 × 3 mm	36	24	Class 10	—	1	99183A340	0000


		Zinc-Plated Steel



				M5 × 0.8 mm	8	5.1	Class 10	Material Certificate	100	99183A110	0000


				M6 × 1 mm	10	6	Class 10	Material Certificate	100	99183A120	00000
				M8 × 1.25 mm	13	8	Class 10	—	50	99183A130	00000
				M8 × 1 mm	13	8	Class 10	Material Certificate	50	99183A360	00000
				M10 × 1.5 mm	17	10	Class 10	—	25	99183A140	00000
				M10 × 1.25 mm	17	10	Class 10	—	10	99183A750	00000
				M10 × 1 mm	17	10	Class 10	—	25	99183A370	00000
				M12 × 1.75 mm	19	12	Class 10	—	25	99183A150	00000
				M12 × 1.5 mm	19	12	Class 10	—	10	99183A760	00000
				M12 × 1.25 mm	19	12	Class 10	Material Certificate	25	99183A380	00000
				M14 × 2 mm	22	14	Class 10	—	10	99183A160	0000


				M14 × 1.5 mm	22	14	Class 10	—	10	99183A390	0000
				M16 × 2 mm	24	16	Class 10	Material Certificate	10	99183A170	0000
				M16 × 1.5 mm	24	16	Class 10	—	10	99183A410	00000
				M18 × 2.5 mm	27	18	Class 10	Material Certificate	5	99183A180	0000
				M18 × 1.5 mm	27	18	Class 10	—	5	99183A420	00000
				M20 × 2.5 mm	30	20	Class 10	—	5	99183A190	00000
				M20 × 1.5 mm	30	20	Class 10	—	5	99183A430	00000
				M22 × 2.5 mm	32	22	Class 10	—	5	99183A210	00000
				M22 × 1.5 mm	32	22	Class 10	—	5	99183A440	00000
				M24 × 3 mm	36	24	Class 10	—	1	99183A220	0000


				M24 × 1.5 mm	36	24	Class 10	Material Certificate	1	99183A450	0000
				M27 × 3 mm	41	27	Class 10	Material Certificate	1	99183A230	0000
				M30 × 3.5 mm	46	30	Class 10	—	1	99183A240	0000
				M30 × 2 mm	46	30	Class 10	—	1	99183A460	0000


				Black-Phosphate-Coated Steel



M5 × 0.8 mm	8					5.1	Class 10	—	50	99183A510	00000


M6 × 1 mm	10					6	Class 10	—	25	99183A520	0000
M8 × 1.25 mm	13					8	Class 10	—	25	99183A540	00000
M8 × 1 mm	13					8	Class 10	—	10	99183A530	0000
M10 × 1.5 mm	17					10	Class 10	Material Certificate	10	99183A550	00000
M10 × 1.25 mm	17					10	Class 10	—	5	99183A560	00000
M12 × 1.75 mm	19					12	Class 10	—	5	99183A590	0000
M12 × 1.5 mm	19					12	Class 10	—	5	99183A580	00000
M12 × 1.25 mm	19					12	Class 10	—	5	99183A570	00000
M14 × 2 mm	22					14	Class 10	—	5	99183A620	00000
M14 × 1.5 mm	22					14	Class 10	—	5	99183A610	00000


M16 × 2 mm	24					16	Class 10	—	5	99183A640	00000
M16 × 1.5 mm	24					16	Class 10	—	1	99183A630	0000
M20 × 2.5 mm	30					20	Class 10	—	1	99183A680	0000
M22 × 2.5 mm	33					22	Class 10	—	1	99183A710	0000
M22 × 1.5 mm	33					22	Class 10	—	1	99183A690	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	Certificate Type	Pkg. Qty.		Pkg.
Zinc-Plated Steel



		M6 × 1 mm	10	7.3	14.2	1.1	Class 10	DIN 6927, EN 1664, ISO 7044	—	50	3528N11	000000


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


		Black-Oxide Steel



				M6 × 1 mm	10	7.3	14.2	1.1	Class 10	DIN 6927, EN 1664, ISO 7044	Material Certificate	25	3528N21	0000


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

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



		M5 × 0.8 mm	8	5	11.8	1	Class 10	DIN 6923	—	25	96595A106	00000


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


		Steel



				M5 × 0.8 mm	8	5	11.8	1	Class 10	DIN 6923	—	25	90716A107	0000


				M6 × 1 mm	10	6	14.2	1.1	Class 10	DIN 6923	—	50	90716A101	00000
				M8 × 1.25 mm	13	8	17.9	1.2	Class 10	DIN 6923	—	50	90716A102	00000
				M10 × 1.5 mm	15	10	21.8	1.5	Class 10	DIN 6923	—	25	90716A103	00000
				M12 × 1.75 mm	18	12	26	1.8	Class 10	DIN 6923	—	10	90716A104	00000
				M16 × 2 mm	24	16	34.5	2.4	Class 10	DIN 6923	—	5	90716A105	00000
				M20 × 2.5 mm	30	20	42.8	3	Class 10	DIN 6923	—	1	90716A108	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 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	Pkg. Qty.		Pkg.
Zinc-Plated Steel



	M6 × 1 mm	10	8	Class 10	220	50	97260A101	00000


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