DIN 6331 Flange Nuts | McMaster-Carr

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System of Measurement

Thread Size

Nut Type

Thread Pitch

Hex Nut Profile

Height

Flange Diameter

Material

Width

Flange Thickness

Fastener Strength Grade/Class

Class 10

Thread Direction

Right Hand

Fastener Strength Rating

Thread Type

Performance

Thread Spacing

Drive Style

Specifications Met

Thread Fit

Application

U.S.–Mexico–Canada Agreement (USMCA) Qualifying

Yes

Export Control Classification Number (ECCN)

EAR99

DFARS Specialty Metals

REACH

RoHS

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

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	Class 10	DIN 6331	50	90360A111	000000


		M8 × 1.25 mm	13	12	18	3.5	Class 10	DIN 6331	25	90360A112	00000
		M10 × 1.5 mm	16	15	22	4	Class 10	DIN 6331	10	90360A113	00000
		M12 × 1.75 mm	18	18	25	4	Class 10	DIN 6331	10	90360A114	00000
		M14 × 2 mm	22	21	28	4	Class 10	DIN 6331	5	90360A115	00000
		M16 × 2 mm	24	24	31	5	Class 10	DIN 6331	5	90360A117	00000
		M18 × 2.5 mm	27	27	34	5	Class 10	DIN 6331	1	90360A118	0000
		M20 × 2.5 mm	30	30	37	6	Class 10	DIN 6331	1	90360A119	0000
		M24 × 3 mm	36	36	45	6	Class 10	DIN 6331	1	90360A121	00000
		M30 × 3.5 mm	46	45	58	8	Class 10	DIN 6331	1	90360A122	00000
		M36 × 4 mm	55	54	68	10	Class 10	DIN 6331	1	90360A123	00000

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

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.

Highly 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	93033A211	00000


		M16 × 2 mm	24	24	31	5	DIN 6331	1	93033A212	00000
		M18 × 2.5 mm	27	27	34	5	DIN 6331	1	93033A213	00000
		M20 × 2.5 mm	30	30	37	6	DIN 6331	1	93033A214	00000
		M24 × 3 mm	36	36	45	6	DIN 6331	1	93033A215	00000
		M30 × 3.5 mm	46	45	58	8	DIN 6331	1	93033A216	00000
		M36 × 4 mm	55	54	68	10	DIN 6331	1	93033A217	00000


		Highly Corrosion-Resistant 316 Stainless Steel



				M14 × 2 mm	22	21	28	4	DIN 6331	1	94777A211	00000


				M16 × 2 mm	24	24	31	5	DIN 6331	1	94777A212	00000
				M18 × 2.5 mm	27	27	34	5	DIN 6331	1	94777A213	00000
				M20 × 2.5 mm	30	30	37	6	DIN 6331	1	94777A214	00000
				M24 × 3 mm	36	36	45	6	DIN 6331	1	94777A215	00000
				M30 × 3.5 mm	46	45	58	8	DIN 6331	1	94777A216	00000
				M36 × 4 mm	55	54	68	10	DIN 6331	1	94777A217	00000