Low-Crown Acorn Nuts | McMaster-Carr

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27 Products

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.

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.

	Thread Dp.	Wd.	Ht.	Pkg. Qty.		Pkg.
18-8 Stainless Steel


	6-32	3/16"	5/16"	9/32"	10	000000000	00000
	8-32	3/16"	5/16"	9/32"	10	000000000	0000
	10-24	7/32"	3/8"	11/32"	10	000000000	00000
	10-32	7/32"	3/8"	11/32"	10	000000000	00000
	1/4"-20	7/32"	7/16"	3/8"	10	000000000	00000
	1/4"-28	7/32"	7/16"	3/8"	10	000000000	00000
	5/16"-18	9/32"	9/16"	7/16"	5	000000000	00000
	5/16"-24	9/32"	9/16"	7/16"	5	000000000	00000
	3/8"-16	5/16"	5/8"	1/2"	5	000000000	00000
	3/8"-24	5/16"	5/8"	1/2"	5	000000000	00000
	7/16"-14	3/8"	3/4"	9/16"	1	000000000	0000
	7/16"-20	3/8"	3/4"	9/16"	1	000000000	0000
	1/2"-13	3/8"	3/4"	9/16"	1	000000000	0000
	1/2"-20	3/8"	3/4"	9/16"	1	000000000	0000
	5/8"-11	7/16"	15/16"	3/4"	1	000000000	00000
	3/4"-10	1/2"	1 1/16"	7/8"	1	000000000	00000

Sanitary Cap Nuts

With extremely smooth sides and rounded edges, these nuts are free of crevices where bacteria can grow. Use them to cover and protect exposed threads while fastening parts together. Nuts are certified by EHEDG to meet sanitary design standards. They have a Buna-N seal on the base that keeps liquid, debris, and other contaminants off the threads. The seal is made with metal and chemical additives, so you can find it with a metal detector or X-ray machine if it falls into your line. Also known as acorn nuts, these have a domed head to create a finished look.

Stainless Steel

Image of Product. Front orientation. Cap Nuts. Sanitary Cap Nuts.

Super-Corrosion-Resistant 316 Stainless Steel—Won't corrode from frequent washdowns and can stand up to the harshest cleaners and detergents.

	Thread Dp.	Wd.	Ht.	Seal Material	Certification	Food Industry Std.		Each
Super-Corrosion-Resistant 316 Stainless Steel


	1/4"-20	1/4"	7/16"	21/64"	Buna-N	EHEDG Certified	FDA Compliant 21 CFR 177.2600	000000000	00000
	5/16"-18	9/32"	1/2"	25/64"	Buna-N	EHEDG Certified	FDA Compliant 21 CFR 177.2600	000000000	0000
	3/8"-16	5/16"	9/16"	15/32"	Buna-N	EHEDG Certified	FDA Compliant 21 CFR 177.2600	000000000	00000
	7/16"-14	21/64"	11/16"	33/64"	Buna-N	EHEDG Certified	FDA Compliant 21 CFR 177.2600	000000000	00000
	1/2"-13	11/32"	3/4"	35/64"	Buna-N	EHEDG Certified	FDA Compliant 21 CFR 177.2600	000000000	00000
	5/8"-11	7/16"	15/16"	43/64"	Buna-N	EHEDG Certified	FDA Compliant 21 CFR 177.2600	000000000	00000
	M6 × 1 mm	5.5 mm	10 mm	8 mm	Buna-N	EHEDG Certified	FDA Compliant 21 CFR 177.2600	000000000	00000
	M8 × 1.25 mm	6.5 mm	13 mm	10 mm	Buna-N	EHEDG Certified	FDA Compliant 21 CFR 177.2600	000000000	00000
	M10 × 1.5 mm	8 mm	16 mm	12 mm	Buna-N	EHEDG Certified	FDA Compliant 21 CFR 177.2600	000000000	00000
	M12 × 1.75 mm	9 mm	18 mm	14 mm	Buna-N	EHEDG Certified	FDA Compliant 21 CFR 177.2600	000000000	00000
	M16 × 2 mm	10.5 mm	24 mm	17 mm	Buna-N	EHEDG Certified	FDA Compliant 21 CFR 177.2600	000000000	00000