ISO 4161 Flange Nuts | McMaster-Carr

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System of Measurement

Thread Size

Thread Pitch

Nut Type

Finish

Zinc Yellow-Chromate Plated

Material

18-8 Stainless Steel

Steel

Fastener Strength Grade/Class

Height

Width

Flange Diameter

Hex Nut Profile

Flange Thickness

Specifications Met

Thread Spacing

Thread Type

Performance

Locking Type

Thread Direction

Fastener Strength Rating

Drive Style

Thread Fit

REACH

RoHS

Export Control Classification Number (ECCN)

EAR99

Color

Black

DFARS Specialty Metals

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	ISO Class 8	DIN 6923, ISO 4161	100	000000000	00000


		M5 × 0.8 mm	8	5	11.8	2.8	ISO Class 8	DIN 6923, ISO 4161	100	000000000	0000
		M6 × 1 mm	10	6	14.2	2.9	ISO Class 8	DIN 6923, ISO 4161	100	000000000	0000
		M8 × 1 mm	13	8	17.9	3.5	ISO Class 8	DIN 6923, ISO 4161	50	000000000	00000
		M8 × 1.25 mm	13	8	17.9	3.5	ISO Class 8	DIN 6923, ISO 4161	100	000000000	00000
		M10 × 1.25 mm	15	10	21.8	4.5	ISO Class 8	DIN 6923, ISO 4161	50	000000000	00000
		M10 × 1.5 mm	15	10	21.8	4.5	ISO Class 8	DIN 6923, ISO 4161	50	000000000	00000
		M12 × 1.25 mm	18	12	26	5.3	ISO Class 8	DIN 6923, ISO 4161	25	000000000	00000
		M12 × 1.5 mm	18	12	26	5.3	ISO Class 8	DIN 6923, ISO 4161	10	000000000	0000
		M12 × 1.75 mm	18	12	26	5.3	ISO Class 8	DIN 6923, ISO 4161	25	000000000	00000
		M14 × 2 mm	21	14	29.9	6.2	ISO Class 8	DIN 6923, ISO 4161	10	000000000	00000


		M16 × 1.5 mm	24	16	34.5	7	ISO Class 8	DIN 6923, ISO 4161	1	000000000	0000
		M16 × 2 mm	24	16	34.5	7	ISO Class 8	DIN 6923, ISO 4161	10	000000000	00000
		M20 × 2.5 mm	30	20	42.8	9	ISO Class 8	DIN 6923, ISO 4161	5	000000000	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's more durable than clear zinc plating.

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, ISO 4161	25	000000000	000000


		M6 × 1 mm	10	6	14.2	1.1	ISO Class 10	DIN 6923, ISO 4161	100	000000000	0000
		M8 × 1.25 mm	13	8	17.9	1.2	ISO Class 10	DIN 6923, ISO 4161	100	000000000	00000
		M10 × 1.25 mm	15	10	21.8	1.5	ISO Class 10	DIN 6923, ISO 4161	10	000000000	0000
		M10 × 1.5 mm	15	10	21.8	1.5	ISO Class 10	DIN 6923, ISO 4161	50	000000000	00000
		M12 × 1.25 mm	18	12	26	1.8	ISO Class 10	DIN 6923, ISO 4161	5	000000000	0000
		M12 × 1.5 mm	18	12	26	1.8	ISO Class 10	DIN 6923, ISO 4161	5	000000000	0000
		M12 × 1.75 mm	18	12	26	1.8	ISO Class 10	DIN 6923, ISO 4161	25	000000000	0000
		M14 × 1.5 mm	21	14	29.9	2.1	ISO Class 10	DIN 6923, ISO 4161	10	000000000	00000
		M16 × 1.5 mm	24	16	34.5	2.4	ISO Class 10	DIN 6923, ISO 4161	1	000000000	0000
		M16 × 2 mm	24	16	34.5	2.4	ISO Class 10	DIN 6923, ISO 4161	10	000000000	00000


		M20 × 2.5 mm	30	20	42.8	3	ISO Class 10	DIN 6923, ISO 4161	1	000000000	0000
		M24 × 3 mm	36	24	51	3.6	ISO Class 10	DIN 6923, ISO 4161	1	000000000	00000


		Zinc-Yellow-Chromate-Plated Steel



				M6 × 1 mm	10	6	14.2	1.1	ISO Class 10	DIN 6923, ISO 4161	50	000000000	0000


				M8 × 1.25 mm	13	8	17.5	1.2	ISO Class 10	DIN 6923, ISO 4161	25	000000000	0000
				M10 × 1.5 mm	15	10	21.8	1.5	ISO Class 10	DIN 6923, ISO 4161	10	000000000	0000
				M12 × 1.25 mm	18	12	26	1.8	ISO Class 10	DIN 6923, ISO 4161	5	000000000	00000
				M12 × 1.5 mm	18	12	26	1.8	ISO Class 10	DIN 6923, ISO 4161	5	000000000	00000
				M12 × 1.75 mm	18	12	26	1.8	ISO Class 10	DIN 6923, ISO 4161	10	000000000	0000
				M14 × 2 mm	21	14	29.9	2.1	ISO Class 10	DIN 6923, ISO 4161	5	000000000	00000
				M16 × 1.5 mm	24	16	34.5	2.4	ISO Class 10	DIN 6923, ISO 4161	1	000000000	0000
				M16 × 2 mm	24	16	34.5	2.4	ISO Class 10	DIN 6923, ISO 4161	5	000000000	00000
				M20 × 2.5 mm	30	20	42.8	3	ISO Class 10	DIN 6923, ISO 4161	1	000000000	0000


				Black Phosphate-Coated Steel



						M5 × 0.8 mm	8	5	11.8	1	ISO Class 10	DIN 6923, ISO 4161	100	000000000	0000


						M6 × 1 mm	10	6	14.2	1.1	ISO Class 10	DIN 6923, ISO 4161	100	000000000	00000
						M8 × 1.25 mm	13	8	17.9	1.2	ISO Class 10	DIN 6923, ISO 4161	100	000000000	00000
						M10 × 1.25 mm	15	10	21.8	1.5	ISO Class 10	DIN 6923, ISO 4161	10	000000000	00000
						M10 × 1.5 mm	15	10	21.8	1.5	ISO Class 10	DIN 6923, ISO 4161	50	000000000	00000
						M12 × 1.25 mm	18	12	26	1.8	ISO Class 10	DIN 6923, ISO 4161	5	000000000	00000
						M12 × 1.5 mm	18	12	26	1.8	ISO Class 10	DIN 6923, ISO 4161	5	000000000	00000
						M12 × 1.75 mm	18	12	26	1.8	ISO Class 10	DIN 6923, ISO 4161	25	000000000	00000
						M16 × 1.5 mm	24	16	34.5	2.4	ISO Class 10	DIN 6923, ISO 4161	1	000000000	0000
						M16 × 2 mm	24	16	34.5	2.4	ISO Class 10	DIN 6923, ISO 4161	10	000000000	00000


						Steel



								M5 × 0.8 mm	8	5	11.8	1	ISO Class 10	DIN 6923, ISO 4161	100	000000000	00000


M6 × 1 mm	10							6	14.2	1.1	ISO Class 10	DIN 6923, ISO 4161	100	000000000	00000
M8 × 1.25 mm	13							8	17.9	1.2	ISO Class 10	DIN 6923, ISO 4161	50	000000000	0000
M10 × 1.5 mm	15							10	21.8	1.5	ISO Class 10	DIN 6923, ISO 4161	50	000000000	00000
M12 × 1.75 mm	18							12	26	1.8	ISO Class 10	DIN 6923, ISO 4161	25	000000000	00000
M14 × 2 mm	21							14	29.9	2.1	ISO Class 10	DIN 6923, ISO 4161	10	000000000	0000
M16 × 2 mm	24							16	34.5	2.4	ISO Class 10	DIN 6923, ISO 4161	10	000000000	00000
M20 × 2.5 mm	30							20	42.8	3	ISO Class 10	DIN 6923, ISO 4161	5	000000000	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	000000000	00000


		M4 × 0.7 mm	7	4	10	0.9	DIN 6923, ISO 4161	50	000000000	00000
		M5 × 0.8 mm	8	5	11.8	1	DIN 6923, ISO 4161	50	000000000	00000
		M6 × 1 mm	10	6	14.2	1.19	DIN 6923, ISO 4161	50	000000000	0000
		M8 × 1.25 mm	13	8	17.9	1.31	DIN 6923, ISO 4161	25	000000000	0000
		M10 × 1.5 mm	15	10	21.8	1.81	DIN 6923, ISO 4161	10	000000000	0000
		M12 × 1.75 mm	18	12	26	2.2	DIN 6923, ISO 4161	10	000000000	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	Pkg. Qty.		Pkg.
Zinc-Plated Steel



		M3 × 0.5 mm	5.5	4	8	0.7	ISO Class 8	DIN 6923, ISO 4161	100	000000000	00000


		M6 × 1 mm	10	6	14.2	1.1	ISO Class 8	DIN 6923, ISO 4161	100	000000000	0000
		M8 × 1.25 mm	13	8	17.9	1.2	ISO Class 8	DIN 6923, ISO 4161	100	000000000	00000
		M16 × 2 mm	24	16	34.5	2.4	ISO Class 8	DIN 6923, ISO 4161	10	000000000	00000
		M20 × 2.5 mm	30	20	42.8	3	ISO Class 8	DIN 6923, ISO 4161	1	000000000	0000


		Zinc-Yellow-Chromate-Plated Steel



				M4 × 0.7 mm	7	4.2	10.5	0.9	ISO Class 8	DIN 6923, ISO 4161	50	000000000	00000


				M5 × 0.8 mm	8	5	11.8	1	ISO Class 8	DIN 6923, ISO 4161	50	000000000	00000
				M6 × 1 mm	10	6	14.2	1.1	ISO Class 8	DIN 6923, ISO 4161	100	000000000	00000
				M8 × 1.25 mm	13	8	17.9	1.2	ISO Class 8	DIN 6923, ISO 4161	50	000000000	00000
				M10 × 1.5 mm	15	10	21.8	1.5	ISO Class 8	DIN 6923, ISO 4161	25	000000000	00000
				M12 × 1.75 mm	18	12	26	1.8	ISO Class 8	DIN 6923, ISO 4161	10	000000000	00000
				M16 × 2 mm	24	16	34.5	2.4	ISO Class 8	DIN 6923, ISO 4161	1	000000000	0000


				Steel



						M12 × 1.75 mm	18	12	26	1.8	ISO Class 8	DIN 6923, ISO 4161	25	000000000	00000