DIN 178 Machine Keys | McMaster-Carr

Filter by

Specifications Met

System of Measurement

Width

Material

Height

Tolerance Rating

Key Type

Length

Minimum Hardness

Hardness

Performance

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

DFARS Specialty Metals

Compliant

Not Compliant

Export Control Classification Number (ECCN)

REACH

RoHS

16 Products

Machine Key Stock

Cut this square or rectangular key stock to length to create a straight machine key. Straight keys are the most common type of key. Machine keys are often the same material as the shaft and other components with which they are used. To use a key as a sacrificial part, choose a softer key that will shear off when parts are exposed to excessive force, preventing damage to expensive equipment.

18-8 Stainless Steel

18-8 stainless steel key stock offers a balance of strength and corrosion resistance. It may be mildly magnetic. 18-8 stainless steel key stock is more corrosion resistant than steel key stock.

Oversized Tolerance—Slightly larger than the size listed in the table, oversized stock fits tightly in a keyway. Press it into place for use in high-torque applications or to replace a key in a worn keyway.

Undersized Tolerance—Slightly smaller than the size listed in the table, undersized stock is the choice when you need a slightly looser fit or when you have an inconsistent keyway. Use it when parts need to be taken apart frequently, such as for maintenance or prototyping.

			Tolerance, mm
	Ht. × Wd.	Tolerance Rating	Ht.	Wd.	Min. Hardness	Specs. Met		Each
305 mm Long



		4 mm × 4 mm	Oversized	0.000 to 0.076	0.000 to 0.076	Rockwell B82	DIN 178	98810A100	00000


		5 mm × 5 mm	Oversized	0.000 to 0.076	0.000 to 0.076	Rockwell B82	DIN 178	98810A110	0000
		6 mm × 6 mm	Oversized	0.000 to 0.076	0.000 to 0.076	Rockwell B82	DIN 178	98810A120	0000
		7 mm × 7 mm	Oversized	0.000 to 0.076	0.000 to 0.076	Rockwell B82	DIN 178	98810A130	0000
		7 mm × 7 mm	Undersized	-0.090 to 0.000	-0.090 to 0.000	Rockwell B82	DIN 178	98810A812	00000
		8 mm × 8 mm	Oversized	0.000 to 0.076	0.000 to 0.076	Rockwell B82	DIN 178	98810A150	0000
		8 mm × 12 mm	Oversized	0.000 to 0.076	0.000 to 0.076	Rockwell B82	DIN 178	98810A155	00000
		10 mm × 10 mm	Oversized	0.000 to 0.076	0.000 to 0.076	Rockwell B82	DIN 178	98810A170	00000
		10 mm × 10 mm	Undersized	-0.090 to 0.000	-0.090 to 0.000	Rockwell B82	DIN 178	98810A332	00000
		12 mm × 12 mm	Oversized	0.000 to 0.076	0.000 to 0.076	Rockwell B82	DIN 178	98810A180	00000
		14 mm × 14 mm	Oversized	0.000 to 0.076	0.000 to 0.076	Rockwell B82	DIN 178	98810A200	00000


		16 mm × 16 mm	Oversized	0.000 to 0.076	0.000 to 0.076	Rockwell B82	DIN 178	98810A210	00000
		18 mm × 18 mm	Oversized	0.000 to 0.076	0.000 to 0.076	Rockwell B82	DIN 178	98810A220	00000
		20 mm × 20 mm	Oversized	0.000 to 0.076	0.000 to 0.076	Rockwell B82	DIN 178	98810A230	00000
		22 mm × 22 mm	Oversized	0.000 to 0.076	0.000 to 0.076	Rockwell B82	DIN 178	98810A240	00000
		24 mm × 24 mm	Oversized	0.000 to 0.076	0.000 to 0.076	Rockwell B82	DIN 178	98810A250	000000