Class 6 Locknuts | McMaster-Carr

Filter by

Product Family

Cap Nuts

Locknuts

System of Measurement

Thread Size

Nut Type

Thread Pitch

Height

Width

Locking Type

Fastener Strength Grade/Class

Material

Hex Nut Profile

Finish

Thread Depth

Specifications Met

Cap Nut Profile

Thread Direction

Performance

Thread Spacing

Thread Type

Insert Maximum Temperature

245° F

Thread Fit

Metric Class 6H

DFARS Specialty Metals

Exempt

Fastener Strength Rating

Low

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

REACH

Compliant

Not Compliant

Export Control Classification Number (ECCN)

RoHS

Help me decide (beta)

14 Products

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.

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



	M4 × 0.7 mm	2.3	7	9.6	Class 6	DIN 986	—	245	50	90582A111	000000


	M5 × 0.8 mm	3.5	8	10.5	Class 6	DIN 986	—	245	25	90582A112	0000
	M6 × 1 mm	3.9	10	12	Class 6	DIN 986	—	245	25	90582A113	0000
	M8 × 1.25 mm	5.2	13	14	Class 6	DIN 986	Material Certificate	245	25	90582A114	00000
	M10 × 1.5 mm	6.4	16	18	Class 6	DIN 986	—	245	10	90582A115	00000
	M12 × 1.75 mm	8.3	18	23	Class 6	DIN 986	—	245	5	90582A116	0000
	M16 × 2 mm	11.3	24	28	Class 6	DIN 986	—	245	1	90582A117	0000
	M20 × 2.5 mm	13.5	30	35	Class 6	DIN 986	—	245	1	90582A118	0000

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	Certificate Type	Pkg. Qty.		Pkg.
Zinc-Plated Steel



	M5 × 0.8 mm	8	4.6	Class 6	—	10	90508A110	000000


	M6 × 1 mm	10	5.1	Class 6	—	10	90508A120	00000
	M8 × 1.25 mm	12	7.3	Class 6	Material Certificate	10	90508A130	00000
	M10 × 1.5 mm	17	8.5	Class 6	—	10	90508A140	00000
	M10 × 1.25 mm	14	8.5	Class 6	Material Certificate	5	90508A150	0000
	M12 × 1.25 mm	17	10.4	Class 6	—	1	90508A160	0000