Class 6 Locknuts | McMaster-Carr

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14 Products

Spring-Stop Locknuts

These locknuts withstand heavy vibration similar to distorted-thread nuts, and you can use them over and over. The prongs at the top bend when tightened to create tension for a secure hold. As you remove the locknut, the prongs spring back to their original shape, so you can install the nut again without losing holding power. Also known as Fuji locknuts.

Low-Strength Steel

Image of Product. Front orientation. Locknuts. Spring-Stop Locknuts.

Rated Grade 2, Class 6, or lower, these locknuts 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.

	Wd., mm	Ht., mm	Fastener Strength Grade/Class	Pkg. Qty.		Pkg.
Zinc-Plated Steel


	M5 × 0.8 mm	8	4.6	ISO Class 6	10	000000000	000000
	M6 × 1 mm	10	5.1	ISO Class 6	10	000000000	00000
	M8 × 1.25 mm	12	7.3	ISO Class 6	10	000000000	00000
	M10 × 1.25 mm	14	8.5	ISO Class 6	5	000000000	0000
	M10 × 1.5 mm	17	8.5	ISO Class 6	10	000000000	00000
	M12 × 1.25 mm	17	10.4	ISO Class 6	1	000000000	0000

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

Image of Product. Front orientation. Cap Nuts. Nylon-Insert Cap Nuts.

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.

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


	M4 × 0.7 mm	2.3	7	9.6	ISO Class 6	DIN 986	245	50	000000000	000000
	M5 × 0.8 mm	3.5	8	10.5	ISO Class 6	DIN 986	245	25	000000000	0000
	M6 × 1 mm	3.9	10	12	ISO Class 6	DIN 986	245	25	000000000	0000
	M8 × 1.25 mm	5.2	13	14	ISO Class 6	DIN 986	245	25	000000000	00000
	M10 × 1.5 mm	6.4	16	18	ISO Class 6	DIN 986	245	10	000000000	00000
	M12 × 1.75 mm	8.3	18	23	ISO Class 6	DIN 986	245	5	000000000	0000
	M16 × 2 mm	11.3	24	28	ISO Class 6	DIN 986	245	1	000000000	0000
	M20 × 2.5 mm	13.5	30	35	ISO Class 6	DIN 986	245	1	000000000	0000