DIN 178 Machine Keys | McMaster-Carr

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Specifications Met

DIN Standard

DIN 178

System of Measurement

Width

Material

Height

Tolerance Rating

Key Type

Length

Minimum Hardness

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	000000000	00000
		5 mm × 5 mm	Oversized	0.000 to 0.076	0.000 to 0.076	Rockwell B82	DIN 178	000000000	0000
		6 mm × 6 mm	Oversized	0.000 to 0.076	0.000 to 0.076	Rockwell B82	DIN 178	000000000	00000
		7 mm × 7 mm	Oversized	0.000 to 0.076	0.000 to 0.076	Rockwell B82	DIN 178	000000000	00000
		7 mm × 7 mm	Undersized	-0.090 to 0.000	-0.090 to 0.000	Rockwell B82	DIN 178	000000000	00000
		8 mm × 8 mm	Oversized	0.000 to 0.076	0.000 to 0.076	Rockwell B82	DIN 178	000000000	00000
		8 mm × 12 mm	Oversized	0.000 to 0.076	0.000 to 0.076	Rockwell B82	DIN 178	000000000	00000
		10 mm × 10 mm	Oversized	0.000 to 0.076	0.000 to 0.076	Rockwell B82	DIN 178	000000000	00000
		10 mm × 10 mm	Undersized	-0.090 to 0.000	-0.090 to 0.000	Rockwell B82	DIN 178	000000000	00000
		12 mm × 12 mm	Oversized	0.000 to 0.076	0.000 to 0.076	Rockwell B82	DIN 178	000000000	00000
		14 mm × 14 mm	Oversized	0.000 to 0.076	0.000 to 0.076	Rockwell B82	DIN 178	000000000	00000
		16 mm × 16 mm	Oversized	0.000 to 0.076	0.000 to 0.076	Rockwell B82	DIN 178	000000000	00000
		18 mm × 18 mm	Oversized	0.000 to 0.076	0.000 to 0.076	Rockwell B82	DIN 178	000000000	00000
		20 mm × 20 mm	Oversized	0.000 to 0.076	0.000 to 0.076	Rockwell B82	DIN 178	000000000	000000
		22 mm × 22 mm	Oversized	0.000 to 0.076	0.000 to 0.076	Rockwell B82	DIN 178	000000000	000000
		24 mm × 24 mm	Oversized	0.000 to 0.076	0.000 to 0.076	Rockwell B82	DIN 178	000000000	000000