DIN 6331 Flange Nuts | McMaster-Carr

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25 Products

Performance

High Strength

Withstand heavy loads and high stress without cracking

11 products

Corrosion Resistant

Won't rust in wet and outdoor environments

14 products

Hex Nut Profile

High

Large gripping area keeps wrenches from slipping off as you tighten

11 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.

Corrosion-Resistant Stainless Steel

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

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


		M14 × 2 mm	22	21	28	4	DIN 6331	1	000000000	00000
		M16 × 2 mm	24	24	31	5	DIN 6331	1	000000000	0000
		M18 × 2.5 mm	27	27	34	5	DIN 6331	1	000000000	00000
		M20 × 2.5 mm	30	30	37	6	DIN 6331	1	000000000	00000
		M24 × 3 mm	36	36	45	6	DIN 6331	1	000000000	00000
		M30 × 3.5 mm	46	45	58	8	DIN 6331	1	000000000	00000
		M36 × 4 mm	55	54	68	10	DIN 6331	1	000000000	00000

		Super-Corrosion-Resistant 316 Stainless Steel


				M14 × 2 mm	22	21	28	4	DIN 6331	1	000000000	00000
				M16 × 2 mm	24	24	31	5	DIN 6331	1	000000000	00000
				M18 × 2.5 mm	27	27	34	5	DIN 6331	1	000000000	00000
				M20 × 2.5 mm	30	30	37	6	DIN 6331	1	000000000	00000
				M24 × 3 mm	36	36	45	6	DIN 6331	1	000000000	00000
				M30 × 3.5 mm	46	45	58	8	DIN 6331	1	000000000	00000
				M36 × 4 mm	55	54	68	10	DIN 6331	1	000000000	00000

High-Profile Flange Nuts

30% taller than standard-profile nuts, these have a large gripping area so your wrench or socket won't slip off as you tighten them. They also engage more threads for extra gripping power. 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

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.

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.
Steel


		M6 × 1 mm	10	9	14	3	ISO Class 10	DIN 6331	50	000000000	000000
		M8 × 1.25 mm	13	12	18	3.5	ISO Class 10	DIN 6331	25	000000000	00000
		M10 × 1.5 mm	16	15	22	4	ISO Class 10	DIN 6331	10	000000000	00000
		M12 × 1.75 mm	18	18	25	4	ISO Class 10	DIN 6331	10	000000000	00000
		M14 × 2 mm	22	21	28	4	ISO Class 10	DIN 6331	5	000000000	00000
		M16 × 2 mm	24	24	31	5	ISO Class 10	DIN 6331	5	000000000	00000
		M18 × 2.5 mm	27	27	34	5	ISO Class 10	DIN 6331	1	000000000	0000
		M20 × 2.5 mm	30	30	37	6	ISO Class 10	DIN 6331	1	000000000	0000
		M24 × 3 mm	36	36	45	6	ISO Class 10	DIN 6331	1	000000000	00000
		M30 × 3.5 mm	46	45	58	8	ISO Class 10	DIN 6331	1	000000000	00000
		M36 × 4 mm	55	54	68	10	ISO Class 10	DIN 6331	1	000000000	00000