DIN 6923 Nuts | McMaster-Carr

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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.

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.

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-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.

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
		M4 × 0.7 mm	7	4.6	10	0.4	ISO Class 8	DIN 6923	100	000000000	0000
		M5 × 0.8 mm	8	5	11.8	1	ISO Class 8	DIN 6923	100	000000000	0000
		M6 × 1 mm	10	6	14.2	1.1	ISO Class 8	DIN 6923, ISO 4161	100	000000000	0000
		M8 × 1 mm	13	8	17.9	1.2	ISO Class 8	DIN 6923	100	000000000	00000
		M8 × 1.25 mm	13	8	17.9	1.2	ISO Class 8	DIN 6923, ISO 4161	100	000000000	00000
		M10 × 1.25 mm	15	10	21.8	1.5	ISO Class 8	DIN 6923	50	000000000	00000
		M10 × 1.5 mm	15	10	21.8	1.5	ISO Class 8	DIN 6923	50	000000000	00000
		M12 × 1.75 mm	18	12	26	1.8	ISO Class 8	DIN 6923	25	000000000	00000
		M14 × 2 mm	21	14	29.9	2.1	ISO Class 8	DIN 6923	25	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 × 1.25 mm	15	10	21.8	1.5	ISO Class 8	DIN 6923	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
				M14 × 2 mm	21	14	29.9	2.1	ISO Class 8	DIN 6923	25	000000000	00000
				M16 × 2 mm	24	16	34.5	2.4	ISO Class 8	DIN 6923, ISO 4161	1	000000000	0000

				Black-Oxide Steel


						M4 × 0.7 mm	7	4.6	10	0.4	ISO Class 8	DIN 6923	100	000000000	0000
						M5 × 0.8 mm	8	5	11.8	1	ISO Class 8	DIN 6923	100	000000000	0000
						M6 × 1 mm	10	6	14.2	1.1	ISO Class 8	DIN 6923	100	000000000	0000
						M8 × 1 mm	13	8	17.9	1.2	ISO Class 8	DIN 6923	100	000000000	00000
						M8 × 1.25 mm	13	8	17.9	1.2	ISO Class 8	DIN 6923	100	000000000	00000
						M10 × 1.25 mm	15	10	21.8	1.5	ISO Class 8	DIN 6923	50	000000000	00000
						M10 × 1.5 mm	15	10	21.8	1.5	ISO Class 8	DIN 6923	50	000000000	00000
						M12 × 1.75 mm	18	12	26	1.8	ISO Class 8	DIN 6923	25	000000000	00000

						Steel


								M4 × 0.7 mm	7	4.6	10	0.4	ISO Class 8	DIN 6923	100	000000000	0000
								M8 × 1 mm	13	8	17.9	1.2	ISO Class 8	DIN 6923	100	000000000	00000
								M10 × 1.25 mm	15	10	21.8	1.5	ISO Class 8	DIN 6923	50	000000000	0000
								M12 × 1.75 mm	18	12	26	1.8	ISO Class 8	DIN 6923, ISO 4161	25	000000000	00000
								M14 × 2 mm	21	14	29.9	2.1	ISO Class 8	DIN 6923	25	000000000	00000
								M16 × 2 mm	24	16	34.5	2.4	ISO Class 8	DIN 6923	10	000000000	0000

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.

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

		Steel


				M5 × 0.8 mm	8	5	11.8	1	ISO Class 10	DIN 6923	25	000000000	0000
				M6 × 1 mm	10	6	14.2	1.1	ISO Class 10	DIN 6923	50	000000000	00000
				M8 × 1.25 mm	13	8	17.9	1.2	ISO Class 10	DIN 6923	50	000000000	00000
				M10 × 1.5 mm	15	10	21.8	1.5	ISO Class 10	DIN 6923	25	000000000	00000
				M12 × 1.75 mm	18	12	26	1.8	ISO Class 10	DIN 6923	10	000000000	00000
				M16 × 2 mm	24	16	34.5	2.4	ISO Class 10	DIN 6923	5	000000000	00000
				M20 × 2.5 mm	30	20	42.8	3	ISO Class 10	DIN 6923	1	000000000	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.

Super-Corrosion-Resistant 316 Stainless Steel—Our most corrosion-resistant flange nuts, these hold up in just about any environment, including harsh weather, salt water, and most chemicals.

				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	0.7	DIN 6923	100	000000000	00000
		M4 × 0.7 mm	7	4.65	10	1	DIN 6923	100	000000000	00000
		M5 × 0.8 mm	8	5	11	1	DIN 6923	100	000000000	00000
		M6 × 1 mm	10	6	14.2	1.18	DIN 6923	50	000000000	0000
		M8 × 1.25 mm	13	8	17.9	1.3	DIN 6923	25	000000000	0000
		M10 × 1.5 mm	15	10	21.8	1.8	DIN 6923	25	000000000	0000
		M12 × 1.75 mm	18	12	26	2.19	DIN 6923	10	000000000	0000

		Super-Corrosion-Resistant 316 Stainless Steel


				M3 × 0.5 mm	5.5	4	8	0.7	DIN 6923	25	000000000	0000
				M4 × 0.7 mm	7	4.65	10	1	DIN 6923	25	000000000	0000
				M5 × 0.8 mm	8	5	11.8	1	DIN 6923	25	000000000	00000
				M6 × 1 mm	10	6	14.2	1.18	DIN 6923	25	000000000	0000
				M8 × 1.25 mm	13	8	17.9	1.3	DIN 6923	10	000000000	0000
				M10 × 1.5 mm	15	10	21.8	1.8	DIN 6923	10	000000000	0000
				M12 × 1.75 mm	18	12	26	2.19	DIN 6923	5	000000000	0000

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.

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	0.8	ISO Class 8	DIN 6923	50	000000000	00000
		M4 × 0.7 mm	7	4.65	10	1.65	ISO Class 8	DIN 6923, ISO 4161	100	000000000	0000
		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

		Steel


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

High-Strength Steel

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 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	0000
				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	0000
				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.

Super-Corrosion-Resistant 316 Stainless Steel—Our most corrosion-resistant flange nuts, these hold up in just about any environment, including harsh weather, salt water, and most chemicals.

				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

		Super-Corrosion-Resistant 316 Stainless Steel


				M3 × 0.5 mm	5.5	4	8	0.7	DIN 6923	100	000000000	0000
				M4 × 0.7 mm	7	4	10	0.9	DIN 6923	100	000000000	00000
				M5 × 0.8 mm	8	5	11.8	1	DIN 6923	100	000000000	00000
				M6 × 1 mm	10	6	14.2	1.19	DIN 6923	50	000000000	00000
				M8 × 1.25 mm	13	8	17.9	1.31	DIN 6923	10	000000000	0000
				M10 × 1.5 mm	15	10	21.8	1.81	DIN 6923	10	000000000	0000
				M12 × 1.75 mm	18	12	26	2.2	DIN 6923	5	000000000	0000