Nylon Acorn Nuts | McMaster-Carr

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Nylon 6/6

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Unified Standard Class 2B

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Export Control Classification Number (ECCN)

EAR99

DFARS Specialty Metals

Exempt

Maximum Temperature

185° F

Fastener Strength Rating

42 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.

Plastic

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

Nylon 6/6—Slippery and abrasion resistant, these nuts thread on smoothly and stand up to daily wear and tear. Nylon will swell and weaken when exposed to moisture, so it's best for dry environments.

								Pkg.
	Thread Size	Wd.	Ht.	Temp. Range, ° F	Choose a Color	Pkg. Qty.		1-9	10-49	50-Up
Nylon 6/6



		4-40	1/4"	9/32"	-40 to 185	Black , Off-White	100	000000000	000000	000000	000000


		6-32	19/64"	11/32"	-40 to 185	Black , Off-White	100	000000000	00000	00000	00000
		8-32	21/64"	3/8"	-40 to 185	Black , Off-White	100	000000000	00000	00000	00000
		10-24	23/64"	13/32"	-40 to 185	Black , Off-White	100	000000000	00000	00000	00000
		10-32	23/64"	13/32"	-40 to 185	Black , Off-White	100	000000000	00000	00000	00000
		1/4"-20	27/64"	15/32"	-40 to 185	Black , Off-White	100	000000000	00000	00000	00000
		1/4"-28	27/64"	15/32"	-40 to 185	Black , Off-White	100	000000000	00000	00000	00000
		5/16"-18	1/2"	17/32"	-40 to 185	Black , Off-White	50	000000000	00000	00000	00000
		5/16"-24	1/2"	17/32"	-40 to 185	Black , Off-White	50	000000000	00000	00000	00000
		3/8"-16	9/16"	5/8"	-40 to 185	Black , Off-White	25	000000000	00000	00000	0000
		3/8"-24	9/16"	5/8"	-40 to 185	Black , Off-White	25	000000000	00000	0000	0000


		7/16"-14	3/4"	13/16"	-40 to 185	Black , Off-White	10	000000000	0000	0000	0000
		1/2"-13	3/4"	13/16"	-40 to 185	Black , Off-White	25	000000000	00000	00000	00000
		1/2"-20	3/4"	13/16"	-40 to 185	Black , Off-White	10	000000000	0000	0000	0000
		5/8"-11	15/16"	31/32"	-40 to 185	Black , Off-White	20	000000000	00000	00000	00000
		M4 × 0.7 mm	7 mm	8 mm	-40 to 185	Black , Off-White	100	000000000	00000	00000	00000
		M5 × 0.8 mm	8 mm	10 mm	-40 to 185	Black , Off-White	100	000000000	00000	00000	00000
		M6 × 1 mm	10 mm	12 mm	-40 to 185	Black , Off-White	100	000000000	00000	00000	00000
		M8 × 1.25 mm	13 mm	15 mm	-40 to 185	Black , Off-White	50	000000000	00000	00000	00000
		M10 × 1.5 mm	17 mm	18 mm	-40 to 185	Black , Off-White	25	000000000	00000	00000	00000
		M12 × 1.75 mm	19 mm	20.5 mm	-40 to 185	Black , Off-White	25	000000000	00000	00000	00000

Nylon-Insert Cap Nuts

Get the protection of a cap nut with the vibration resistance of a locknut. These nuts not only conceal protruding screw threads, they also have a nylon insert that grips the screw to prevent loosening from moderate vibration. However, the insert may become brittle if exposed to high temperatures. Nuts are reusable a handful of times, but their holding power decreases with each use.

Low-Strength Steel

Rated Grade 2, Class 6, or lower, these nuts are about half as strong as medium-strength steel nuts. 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.

Steel—Best for dry environments since moisture will cause these nuts to rust.

Nylon 6/6 Cap—The nylon cap on these nuts is softer than metal, so it's less likely to scratch surrounding surfaces or parts.

	Thread Dp.	Wd.	Ht.	Fastener Strength Grade/Class	Specs. Met	Insert Max. Temp., ° F	Pkg. Qty.		Pkg.
Zinc-Plated Steel



	M4 × 0.7 mm	2.3 mm	7 mm	9.6 mm	ISO Class 6	DIN 986	245	50	000000000	000000


	M5 × 0.8 mm	3.5 mm	8 mm	10.5 mm	ISO Class 6	DIN 986	245	25	000000000	0000
	M6 × 1 mm	3.9 mm	10 mm	12 mm	ISO Class 6	DIN 986	245	25	000000000	0000
	M8 × 1.25 mm	5.2 mm	13 mm	14 mm	ISO Class 6	DIN 986	245	25	000000000	00000
	M10 × 1.5 mm	6.4 mm	16 mm	18 mm	ISO Class 6	DIN 986	245	10	000000000	00000
	M12 × 1.75 mm	8.3 mm	18 mm	23 mm	ISO Class 6	DIN 986	245	5	000000000	0000
	M16 × 2 mm	11.3 mm	24 mm	28 mm	ISO Class 6	DIN 986	245	1	000000000	0000
	M20 × 2.5 mm	13.5 mm	30 mm	35 mm	ISO Class 6	DIN 986	245	1	000000000	0000


	Zinc-Plated Steel with Nylon 6/6 Cap



			8-32	9/64"	11/32"	23/64"	SAE Grade 2	—	250	25	000000000	0000


			10-24	9/64"	3/8"	23/64"	SAE Grade 2	—	250	25	000000000	0000
			10-32	9/64"	3/8"	23/64"	SAE Grade 2	—	250	25	000000000	0000
			1/4"-20	7/32"	7/16"	31/64"	SAE Grade 2	—	250	25	000000000	0000
			5/16"-18	1/4"	1/2"	1/2"	SAE Grade 2	—	250	10	000000000	0000
			3/8"-16	21/64"	9/16"	5/8"	SAE Grade 2	—	250	25	000000000	00000


			Steel with Nylon 6/6 Cap



					8-32	9/64"	11/32"	23/64"	SAE Grade 2	—	250	25	000000000	0000


					10-32	9/64"	3/8"	23/64"	SAE Grade 2	—	250	25	000000000	0000
					1/4"-20	7/32"	7/16"	31/64"	SAE Grade 2	—	250	25	000000000	0000
					1/4"-28	7/32"	7/16"	31/64"	SAE Grade 2	—	250	25	000000000	0000
					5/16"-24	1/4"	1/2"	1/2"	SAE Grade 2	—	250	25	000000000	0000
					3/8"-24	21/64"	9/16"	5/8"	SAE Grade 2	—	250	25	000000000	00000

Medium-Strength Steel

About twice as strong as low-strength steel, these Grade 5 nuts fasten 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.

Nylon 6/6 Cap—The nylon cap on these nuts is softer than metal, so it's less likely to scratch surrounding surfaces or parts.

	Thread Dp.	Wd.	Ht.	Fastener Strength Grade/Class	Insert Max. Temp., ° F	Pkg. Qty.		Pkg.
Zinc-Plated Steel with Nylon 6/6 Cap



	3/8"-24	21/64"	9/16"	5/8"	SAE Grade 5	250	10	000000000	000000