DIN 1587 Nuts | McMaster-Carr

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Cap Nuts

Conceal and protect protruding screw threads while fastening parts together. These nuts help prevent damage to surrounding materials and reduce injuries. Also known as acorn nuts, they have a smooth, rounded head that creates a finished look.

Corrosion-Resistant Stainless Steel

Image of Product. Front orientation. Cap Nuts. Cap 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 cap nuts, these hold up in just about any environment. They won't degrade from exposure to weather, salt water, and most chemicals.

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


		M3 × 0.5 mm	3.8	5.5	6	DIN 1587	10	000000000	00000
		M4 × 0.7 mm	5.7	7	8	DIN 1587	25	000000000	0000
		M5 × 0.8 mm	4.5	8	10	DIN 1587	25	000000000	0000
		M6 × 1 mm	7.7	10	12	DIN 1587	20	000000000	0000
		M8 × 1.25 mm	10.7	13	15	DIN 1587	10	000000000	0000
		M10 × 1.5 mm	12.7	17	18	DIN 1587	5	000000000	0000
		M12 × 1.75 mm	15.7	19	22	DIN 1587	5	000000000	0000
		M14 × 2 mm	17.7	22	25	DIN 1587	1	000000000	0000
		M16 × 2 mm	20.6	24	28	DIN 1587	1	000000000	0000
		M18 × 2.5 mm	24.6	27	32	DIN 1587	1	000000000	0000
		M20 × 2.5 mm	25.6	30	34	DIN 1587	1	000000000	0000
		M22 × 2.5 mm	28.6	34	39	DIN 1587	1	000000000	0000
		M24 × 3 mm	30.5	36	42	DIN 1587	1	000000000	0000

		Super-Corrosion-Resistant 316 Stainless Steel


				M3 × 0.5 mm	3.8	5.5	6	DIN 1587	25	000000000	0000
				M4 × 0.7 mm	5.5	7	8	DIN 1587	25	000000000	0000
				M5 × 0.8 mm	4.5	8	10	DIN 1587	25	000000000	0000
				M6 × 1 mm	8	10	12	DIN 1587	25	000000000	00000
				M8 × 1.25 mm	11	13	15	DIN 1587	10	000000000	0000
				M10 × 1.5 mm	13	17	18	DIN 1587	10	000000000	00000
				M12 × 1.75 mm	16	19	22	DIN 1587	5	000000000	00000
				M14 × 2 mm	18	22	25	DIN 1587	1	000000000	0000
				M16 × 2 mm	21	24	28	DIN 1587	1	000000000	0000
				M20 × 2.5 mm	26	30	34	DIN 1587	1	000000000	00000
				M22 × 2.5 mm	29	34	39	DIN 1587	1	000000000	00000
				M24 × 3 mm	31	36	42	DIN 1587	1	000000000	00000

Low-Strength Steel

Rated Grade 2, Class 6, or lower, these nuts are about half as strong as medium-strength steel nuts. They are suitable for light duty fastening applications, such as securing access panels. Use them with screws that have a similar strength rating to avoid stripping threads during installation.

Zinc-Plated Steel—A step up from plain steel, the zinc plating withstands occasional exposure to moisture.

Chrome-Plated Steel—The brightest, shiniest finish we offer, this plating has a mirror-like appearance that is often used in decorative applications. It resists salt water and chemicals better than zinc plating and is less likely to wear off.

	Thread
	Size	Dp., mm	Wd., mm	Ht., mm	Specs. Met	Pkg. Qty.		Pkg.
Zinc-Plated Steel


		M4 × 0.7 mm	5.3	7	8	DIN 1587	50	000000000	000000
		M5 × 0.8 mm	3.7	8	10	DIN 1587	50	000000000	00000
		M6 × 1 mm	7.7	10	12	DIN 1587	50	000000000	00000
		M8 × 1.25 mm	10.7	13	15	DIN 1587	25	000000000	00000
		M10 × 1.5 mm	12.7	17	18	DIN 1587	10	000000000	0000
		M12 × 1.75 mm	15.7	19	22	DIN 1587	10	000000000	00000

		Chrome-Plated Steel


				M4 × 0.7 mm	3.9	7	8	DIN 1587	5	000000000	00000
				M5 × 0.8 mm	5.6	8	10	DIN 1587	5	000000000	00000
				M6 × 1 mm	5.7	10	12	DIN 1587	5	000000000	00000
				M8 × 1.25 mm	8.2	13	15	DIN 1587	1	000000000	0000
				M10 × 1.5 mm	9.7	17	18	DIN 1587	1	000000000	0000
				M12 × 1.75 mm	12.2	19	22	DIN 1587	1	000000000	0000

High-Strength Steel

Rated Grade 8 or Class 10, these nuts are about 25% stronger than medium-strength steel nuts. They are commonly used to fasten components in valves, pumps, motors, and other high-stress applications. 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.

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


		M6 × 1 mm	5.7	10	12	ISO Class 10	DIN 1587	5	000000000	000000
		M8 × 1.25 mm	8.2	13	15	ISO Class 10	DIN 1587	5	000000000	00000
		M10 × 1.5 mm	9.7	17	18	ISO Class 10	DIN 1587	1	000000000	0000
		M12 × 1.75 mm	12.2	19	22	ISO Class 10	DIN 1587	1	000000000	00000

Threadlocker Cap Nuts

These nuts not only conceal and protect protruding screw threads, they also resist loosening from mild vibration. They have a nylon patch bonded to their threads that grips screws for a tighter hold than standard cap nuts. They’re reusable a handful of times, but the patch’s holding power decreases with each use. Also known as acorn nuts, they have a smooth, rounded head that creates a finished look.

Corrosion-Resistant Stainless Steel

Image of Product. Front orientation. Contains Annotated, Border. Cap Nuts. Threadlocker Cap 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.

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


		M5 × 0.8 mm	5.6	8	10	DIN 1587	5	000000000	000000
		M6 × 1 mm	5.7	10	12	DIN 1587	5	000000000	00000
		M8 × 1.25 mm	8.2	13	15	DIN 1587	5	000000000	00000
		M10 × 1.5 mm	9.7	17	18	DIN 1587	1	000000000	00000
		M12 × 1.75 mm	12.2	19	22	DIN 1587	1	000000000	00000