ISO 4161 Flange Nuts | McMaster-Carr

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Zinc Yellow-Chromate Plated

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18-8 Stainless Steel

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Fastener Strength Grade/Class

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Flange Thickness

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75 Products

Locking Type

Serrated

Serrations on the flange bite into material for mild vibration resistance

13 products

Application

General Purpose

Nuts have a plain flange for a wide variety of fastening applications

62 products

Performance

Vibration Resistant

Grip tighter than other nuts to resist loosening due to vibration

13 products

High Strength

Withstand heavy loads and high stress without cracking

41 products

Flange Nuts

No need for a separate washer—these nuts have a plain flange that distributes pressure evenly for a wide variety of fastening applications. 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.

Medium-Strength Steel

Image of Product. Front orientation. Flange Nuts. Flange Nuts.

Rated Grade 5, Grade F, or Class 8, these 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.

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



		M4 × 0.7 mm	7	4.65	10	1.65	Class 8	DIN 6923, ISO 4161	100	90374A110	00000


		M5 × 0.8 mm	8	5	11.8	2.8	Class 8	DIN 6923, ISO 4161	100	90374A111	0000
		M6 × 1 mm	10	6	14.2	2.9	Class 8	DIN 6923, ISO 4161	100	90374A112	0000
		M8 × 1 mm	13	8	17.9	3.5	Class 8	DIN 6923, ISO 4161	50	90374A113	0000
		M8 × 1.25 mm	13	8	17.9	3.5	Class 8	DIN 6923, ISO 4161	100	90374A114	00000
		M10 × 1.25 mm	15	10	21.8	4.5	Class 8	DIN 6923, ISO 4161	50	90374A115	00000
		M10 × 1.5 mm	15	10	21.8	4.5	Class 8	DIN 6923, ISO 4161	50	90374A116	0000
		M12 × 1.25 mm	18	12	26	5.3	Class 8	DIN 6923, ISO 4161	25	90374A117	0000
		M12 × 1.5 mm	18	12	26	5.3	Class 8	DIN 6923, ISO 4161	10	90374A118	0000
		M12 × 1.75 mm	18	12	26	5.3	Class 8	DIN 6923, ISO 4161	25	90374A119	00000
		M14 × 2 mm	21	14	29.9	6.2	Class 8	DIN 6923, ISO 4161	10	90374A120	0000


		M16 × 1.5 mm	24	16	34.5	7	Class 8	DIN 6923, ISO 4161	1	90374A121	0000
		M16 × 2 mm	24	16	34.5	7	Class 8	DIN 6923, ISO 4161	10	90374A122	00000
		M20 × 2.5 mm	30	20	42.8	9	Class 8	DIN 6923, ISO 4161	5	90374A123	00000

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.

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.

Black Phosphate-Coated Steel—The dark coating creates both a finished appearance and a barrier against rust that 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, ISO 4161	Material Certificate	25	95003A201	000000


		M6 × 1 mm	10	6	14.2	1.1	Class 10	DIN 6923, ISO 4161	—	100	95003A101	0000
		M8 × 1.25 mm	13	8	17.9	1.2	Class 10	DIN 6923, ISO 4161	Material Certificate	100	95003A102	00000
		M10 × 1.25 mm	15	10	21.8	1.5	Class 10	DIN 6923, ISO 4161	Material Certificate	10	95003A216	0000
		M10 × 1.5 mm	15	10	21.8	1.5	Class 10	DIN 6923, ISO 4161	—	50	95003A103	00000
		M12 × 1.25 mm	18	12	26	1.8	Class 10	DIN 6923, ISO 4161	—	5	95003A217	0000
		M12 × 1.5 mm	18	12	26	1.8	Class 10	DIN 6923, ISO 4161	—	5	95003A218	0000
		M12 × 1.75 mm	18	12	26	1.8	Class 10	DIN 6923, ISO 4161	—	25	95003A104	00000
		M14 × 1.5 mm	21	14	29.9	2.1	Class 10	DIN 6923, ISO 4161	—	10	95003A214	00000
		M16 × 1.5 mm	24	16	34.5	2.4	Class 10	DIN 6923, ISO 4161	—	1	95003A219	0000
		M16 × 2 mm	24	16	34.5	2.4	Class 10	DIN 6923, ISO 4161	—	10	95003A105	00000


		M20 × 2.5 mm	30	20	42.8	3	Class 10	DIN 6923, ISO 4161	—	1	95003A215	0000
		M24 × 3 mm	36	24	51	3.6	Class 10	DIN 6923, ISO 4161	—	1	95003A204	00000


		Zinc-Yellow-Chromate-Plated Steel



				M6 × 1 mm	10	6	14.2	1.1	Class 10	DIN 6923, ISO 4161	Material Certificate	50	97765A110	0000


				M8 × 1.25 mm	13	8	17.5	1.2	Class 10	DIN 6923, ISO 4161	Material Certificate	25	97765A120	0000
				M10 × 1.5 mm	15	10	21.8	1.5	Class 10	DIN 6923, ISO 4161	Material Certificate	10	97765A130	0000
				M12 × 1.25 mm	18	12	26	1.8	Class 10	DIN 6923, ISO 4161	Material Certificate	5	97765A150	00000
				M12 × 1.5 mm	18	12	26	1.8	Class 10	DIN 6923, ISO 4161	—	5	97765A160	00000
				M12 × 1.75 mm	18	12	26	1.8	Class 10	DIN 6923, ISO 4161	Material Certificate	10	97765A140	0000
				M14 × 2 mm	21	14	29.9	2.1	Class 10	DIN 6923, ISO 4161	Material Certificate	5	97765A170	00000
				M16 × 1.5 mm	24	16	34.5	2.4	Class 10	DIN 6923, ISO 4161	—	1	97765A180	0000
				M16 × 2 mm	24	16	34.5	2.4	Class 10	DIN 6923, ISO 4161	—	5	97765A190	00000
				M20 × 2.5 mm	30	20	42.8	3	Class 10	DIN 6923, ISO 4161	—	1	97765A210	0000


				Black Phosphate-Coated Steel



						M5 × 0.8 mm	8	5	11.8	1	Class 10	DIN 6923, ISO 4161	—	100	94942A111	0000


						M6 × 1 mm	10	6	14.2	1.1	Class 10	DIN 6923, ISO 4161	—	100	94942A101	00000
						M8 × 1.25 mm	13	8	17.9	1.2	Class 10	DIN 6923, ISO 4161	Material Certificate	100	94942A102	00000
						M10 × 1.25 mm	15	10	21.8	1.5	Class 10	DIN 6923, ISO 4161	Material Certificate	10	94942A106	00000
						M10 × 1.5 mm	15	10	21.8	1.5	Class 10	DIN 6923, ISO 4161	—	50	94942A103	00000
						M12 × 1.25 mm	18	12	26	1.8	Class 10	DIN 6923, ISO 4161	—	5	94942A107	00000
						M12 × 1.5 mm	18	12	26	1.8	Class 10	DIN 6923, ISO 4161	—	5	94942A108	00000
						M12 × 1.75 mm	18	12	26	1.8	Class 10	DIN 6923, ISO 4161	—	25	94942A104	00000
						M16 × 1.5 mm	24	16	34.5	2.4	Class 10	DIN 6923, ISO 4161	—	1	94942A109	0000
						M16 × 2 mm	24	16	34.5	2.4	Class 10	DIN 6923, ISO 4161	Material Certificate	10	94942A105	00000


						Steel



								M5 × 0.8 mm	8	5	11.8	1	Class 10	DIN 6923, ISO 4161	—	100	95003A205	00000


M6 × 1 mm	10							6	14.2	1.1	Class 10	DIN 6923, ISO 4161	—	100	95003A206	00000
M8 × 1.25 mm	13							8	17.9	1.2	Class 10	DIN 6923, ISO 4161	—	50	95003A207	0000
M10 × 1.5 mm	15							10	21.8	1.5	Class 10	DIN 6923, ISO 4161	—	50	95003A208	00000
M12 × 1.75 mm	18							12	26	1.8	Class 10	DIN 6923, ISO 4161	—	25	95003A209	00000
M14 × 2 mm	21							14	29.9	2.1	Class 10	DIN 6923, ISO 4161	—	10	95003A211	0000
M16 × 2 mm	24							16	34.5	2.4	Class 10	DIN 6923, ISO 4161	Material Certificate	10	95003A212	00000
M20 × 2.5 mm	30							20	42.8	3	Class 10	DIN 6923, ISO 4161	—	5	95003A213	00000

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.

				Flange, mm
	Thread Size	Wd., mm	Ht., mm	Dia.	Thk.	Specs. Met	Pkg. Qty.		Pkg.
18-8 Stainless Steel



		M3 × 0.5 mm	5.5	4	8	1	DIN 6923, ISO 4161	100	93033A107	00000


		M4 × 0.7 mm	7	4	10	0.9	DIN 6923, ISO 4161	50	93033A105	00000
		M5 × 0.8 mm	8	5	11.8	1	DIN 6923, ISO 4161	50	93033A106	0000
		M6 × 1 mm	10	6	14.2	1.19	DIN 6923, ISO 4161	50	93033A101	0000
		M8 × 1.25 mm	13	8	17.9	1.31	DIN 6923, ISO 4161	25	93033A102	0000
		M10 × 1.5 mm	15	10	21.8	1.81	DIN 6923, ISO 4161	10	93033A103	0000
		M12 × 1.75 mm	18	12	26	2.2	DIN 6923, ISO 4161	10	93033A104	00000

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.

Medium-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



		M3 × 0.5 mm	5.5	4	8	0.7	Class 8	DIN 6923, ISO 4161	—	100	96194A206	00000


		M6 × 1 mm	10	6	14.2	1.1	Class 8	DIN 6923, ISO 4161	—	100	96194A101	0000
		M8 × 1.25 mm	13	8	17.9	1.2	Class 8	DIN 6923, ISO 4161	—	100	96194A102	00000
		M16 × 2 mm	24	16	34.5	2.4	Class 8	DIN 6923, ISO 4161	—	10	96194A204	00000
		M20 × 2.5 mm	30	20	42.8	3	Class 8	DIN 6923, ISO 4161	—	1	96194A205	0000


		Zinc-Yellow-Chromate-Plated Steel



				M4 × 0.7 mm	7	4.2	10.5	0.9	Class 8	DIN 6923, ISO 4161	—	50	96194A110	00000


				M5 × 0.8 mm	8	5	11.8	1	Class 8	DIN 6923, ISO 4161	—	50	96194A120	00000
				M6 × 1 mm	10	6	14.2	1.1	Class 8	DIN 6923, ISO 4161	Material Certificate	100	96194A130	00000
				M8 × 1.25 mm	13	8	17.9	1.2	Class 8	DIN 6923, ISO 4161	Material Certificate	50	96194A140	00000
				M10 × 1.5 mm	15	10	21.8	1.5	Class 8	DIN 6923, ISO 4161	—	25	96194A150	00000
				M12 × 1.75 mm	18	12	26	1.8	Class 8	DIN 6923, ISO 4161	Material Certificate	10	96194A160	00000
				M16 × 2 mm	24	16	34.5	2.4	Class 8	DIN 6923, ISO 4161	—	1	96194A170	0000


				Steel



						M12 × 1.75 mm	18	12	26	1.8	Class 8	DIN 6923, ISO 4161	—	25	94920A101	00000