10mm Keys | McMaster-Carr

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	System of Measurement System of Measurement

Metric

	Width Width	Show

10mm

	Width Width	Hide

	Overall Length Overall Length

	Height Height

	Material Material

Stainless Steel

Steel

	Key Type Key Type


Straight	Rounded

Woodruff	Tapered

	Tolerance Rating Tolerance Rating

Undersized

Oversized

	Specifications Met Specifications Met

	Minimum Hardness Minimum Hardness

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

DFARS Specialty Metals
Compliant

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant

	For Keyway Diameter For Keyway Diameter

28mm

32mm

45mm

	Thread Size Thread Size

	Thread Pitch Thread Pitch

0.5 mm

	Finish Finish

Zinc Plated

Zinc Yellow-Chromate Plated

	Head Length Head Length

10mm

	For Maximum Keyway Diameter Tolerance For Maximum Keyway Diameter Tolerance

0.000mm

	For Minimum Keyway Diameter Tolerance For Minimum Keyway Diameter Tolerance

-0.200mm

	Head Height Head Height

12mm

	End Height End Height

7.480mm

	Rate of Taper Rate of Taper

1 mm per 100 mm

	For Machine Table T-Slot Width For Machine Table T-Slot Width

10mm

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Rounded Machine Keys

When installed, these keys fill oval keyways completely, reducing stress on the key and shaft. Using them in a closed keyway keeps them from sliding along the shaft axis. The rounded ends make it easy to slide gears, hubs, and other components into place. These are also known as feather keys. 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.

316 stainless steel keys have excellent corrosion resistance, but aren't as strong as steel keys. They may be mildly magnetic.

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

Undersized metric keys meet DIN 6885 dimensional standards.

For technical drawings and 3-D models, click on a part number.

		Tolerance
Lg.	Tolerance Rating	Ht.	Wd.	Specifications Met	Pkg. Qty.		Pkg.
1008-1045 Carbon Steel
8mm × 10mm
20mm	Undersized	-0.090mm to 0.000mm	-0.036mm to 0.000mm	DIN 6885	5	000000000	00000
22mm	Undersized	-0.090mm to 0.000mm	-0.036mm to 0.000mm	DIN 6885	5	000000000	0000
25mm	Undersized	-0.090mm to 0.000mm	-0.036mm to 0.000mm	DIN 6885	5	000000000	0000
28mm	Undersized	-0.090mm to 0.000mm	-0.036mm to 0.000mm	DIN 6885	5	000000000	0000
30mm	Undersized	-0.090mm to 0.000mm	-0.036mm to 0.000mm	DIN 6885	5	000000000	0000
32mm	Undersized	-0.090mm to 0.000mm	-0.036mm to 0.000mm	DIN 6885	5	000000000	0000
36mm	Undersized	-0.090mm to 0.000mm	-0.036mm to 0.000mm	DIN 6885	5	000000000	0000
38mm	Undersized	-0.036mm to 0.000mm	-0.036mm to 0.000mm	DIN 6885	5	000000000	0000
40mm	Undersized	-0.090mm to 0.000mm	-0.036mm to 0.000mm	DIN 6885	5	000000000	0000
45mm	Undersized	-0.090mm to 0.000mm	-0.036mm to 0.000mm	DIN 6885	5	000000000	00000
48mm	Undersized	-0.036mm to 0.000mm	-0.036mm to 0.000mm	DIN 6885	5	000000000	00000
50mm	Undersized	-0.090mm to 0.000mm	-0.036mm to 0.000mm	DIN 6885	5	000000000	00000
55mm	Undersized	-0.036mm to 0.000mm	-0.036mm to 0.000mm	DIN 6885	5	000000000	00000
56mm	Undersized	-0.036mm to 0.000mm	-0.036mm to 0.000mm	DIN 6885	5	000000000	00000
60mm	Undersized	-0.036mm to 0.000mm	-0.036mm to 0.000mm	DIN 6885	5	000000000	00000
63mm	Undersized	-0.036mm to 0.000mm	-0.036mm to 0.000mm	DIN 6885	5	000000000	00000
70mm	Undersized	-0.036mm to 0.000mm	-0.036mm to 0.000mm	DIN 6885	5	000000000	00000
80mm	Undersized	-0.036mm to 0.000mm	-0.036mm to 0.000mm	DIN 6885	5	000000000	00000
90mm	Undersized	-0.036mm to 0.000mm	-0.036mm to 0.000mm	DIN 6885	5	000000000	00000
100mm	Undersized	-0.036mm to 0.000mm	-0.036mm to 0.000mm	DIN 6885	5	000000000	00000
110mm	Undersized	-0.036mm to 0.000mm	-0.036mm to 0.000mm	DIN 6885	5	000000000	00000
316 Stainless Steel
8mm × 10mm
16mm	Undersized	-0.036mm to 0.000mm	-0.036mm to 0.000mm	DIN 6885	1	00000000	0000
25mm	Undersized	-0.036mm to 0.000mm	-0.036mm to 0.000mm	DIN 6885	1	00000000	0000
28mm	Undersized	-0.036mm to 0.000mm	-0.036mm to 0.000mm	DIN 6885	1	00000000	0000
30mm	Undersized	-0.036mm to 0.000mm	-0.036mm to 0.000mm	DIN 6885	1	00000000	0000
35mm	Undersized	-0.036mm to 0.000mm	-0.036mm to 0.000mm	DIN 6885	1	00000000	0000
36mm	Undersized	-0.036mm to 0.000mm	-0.036mm to 0.000mm	DIN 6885	1	00000000	0000
40mm	Undersized	-0.036mm to 0.000mm	-0.036mm to 0.000mm	DIN 6885	1	00000000	0000
45mm	Undersized	-0.036mm to 0.000mm	-0.036mm to 0.000mm	DIN 6885	1	00000000	00000
50mm	Undersized	-0.036mm to 0.000mm	-0.036mm to 0.000mm	DIN 6885	1	00000000	00000
56mm	Undersized	-0.036mm to 0.000mm	-0.036mm to 0.000mm	DIN 6885	1	00000000	00000
60mm	Undersized	-0.036mm to 0.000mm	-0.036mm to 0.000mm	DIN 6885	1	00000000	00000
70mm	Undersized	-0.036mm to 0.000mm	-0.036mm to 0.000mm	DIN 6885	1	00000000	00000
75mm	Undersized	-0.036mm to 0.000mm	-0.036mm to 0.000mm	DIN 6885	1	00000000	00000
80mm	Undersized	-0.036mm to 0.000mm	-0.036mm to 0.000mm	DIN 6885	1	00000000	00000
100mm	Undersized	-0.036mm to 0.000mm	-0.036mm to 0.000mm	DIN 6885	1	00000000	00000
110mm	Undersized	-0.036mm to 0.000mm	-0.036mm to 0.000mm	DIN 6885	1	00000000	00000
125mm	Undersized	-0.036mm to 0.000mm	-0.036mm to 0.000mm	DIN 6885	1	00000000	00000

Woodruff Keys

Side View

Woodruff keys work well near shaft shoulders, where a standard open keyway would create too much stress. They are also often used on tapered shafts. These keys have a rounded shape that makes them easy to remove when parts need to be taken apart frequently, such as for maintenance or prototyping. Because they're usually shorter than standard machine keys, they work best in light duty applications. Use them to connect gears and other components to shafts. Also known as half moon keys.

Steel keys offer good strength.

Metric keys conform to DIN 6888 standards.

For technical drawings and 3-D models, click on a part number.

				Tolerance
Wd.	For Keyway Dia.	Ht.	Lg.	Wd.	Specifications Met	Pkg. Qty.		Pkg.
1018-1045 Carbon Steel
10mm	28mm	11mm	27.35mm	-0.030mm to 0.000mm	DIN 6888	5	000000000	00000
10mm	32mm	13mm	31.4mm	-0.036mm to 0.000mm	DIN 6888	5	000000000	00000
10mm	45mm	16mm	43.1mm	-0.036mm to 0.000mm	DIN 6888	5	000000000	00000

Machine Keys

Straight keys, with a square or rectangular cross section, are the most common type of key. Install them in keyways to transmit torque from shafts to gears and other components. 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.

Steel keys are strong and easy to machine. Since steel is the most common material, these keys work in many applications. Steel keys rust when exposed to moisture, so they should only be used in dry environments. Slightly smaller than the size listed in the table, undersized keys are the choice when you need a slightly looser fit or when you have an inconsistent keyway. Use them when parts need to be taken apart frequently, such as for maintenance or prototyping.

For technical drawings and 3-D models, click on a part number.

		Tolerance
Lg.	Tolerance Rating	Ht.	Wd.	Minimum Hardness	Specifications Met	Pkg. Qty.		Pkg.
1008-1045 Carbon Steel
8mm × 10mm
20mm	Undersized	-0.036mm to 0.000mm	-0.036mm to 0.000mm	Not Rated	DIN 6885	5	000000000	00000
25mm	Undersized	-0.036mm to 0.000mm	-0.036mm to 0.000mm	Not Rated	DIN 6885	5	000000000	0000
30mm	Undersized	-0.036mm to 0.000mm	-0.036mm to 0.000mm	Not Rated	DIN 6885	5	000000000	0000
32mm	Undersized	-0.036mm to 0.000mm	-0.036mm to 0.000mm	Not Rated	DIN 6885	5	000000000	0000
36mm	Undersized	-0.036mm to 0.000mm	-0.036mm to 0.000mm	Not Rated	DIN 6885	5	000000000	0000
40mm	Undersized	-0.036mm to 0.000mm	-0.036mm to 0.000mm	Not Rated	DIN 6885	5	000000000	0000
45mm	Undersized	-0.036mm to 0.000mm	-0.036mm to 0.000mm	Not Rated	DIN 6885	5	000000000	0000
48mm	Undersized	-0.036mm to 0.000mm	-0.036mm to 0.000mm	Not Rated	DIN 6885	5	000000000	00000
50mm	Undersized	-0.036mm to 0.000mm	-0.036mm to 0.000mm	Not Rated	DIN 6885	5	000000000	00000
55mm	Undersized	-0.036mm to 0.000mm	-0.036mm to 0.000mm	Not Rated	DIN 6885	5	000000000	00000
60mm	Undersized	-0.036mm to 0.000mm	-0.036mm to 0.000mm	Not Rated	DIN 6885	5	000000000	00000
63mm	Undersized	-0.036mm to 0.000mm	-0.036mm to 0.000mm	Not Rated	DIN 6885	5	000000000	00000
70mm	Undersized	-0.036mm to 0.000mm	-0.036mm to 0.000mm	Not Rated	DIN 6885	5	000000000	00000
80mm	Undersized	-0.036mm to 0.000mm	-0.036mm to 0.000mm	Not Rated	DIN 6885	5	000000000	00000
100mm	Undersized	-0.036mm to 0.000mm	-0.036mm to 0.000mm	Not Rated	DIN 6885	5	000000000	00000
110mm	Undersized	-0.036mm to 0.000mm	-0.036mm to 0.000mm	Not Rated	DIN 6885	5	000000000	00000
316 Stainless Steel
8mm × 10mm
45mm	Undersized	-0.036mm to 0.000mm	-0.036mm to 0.000mm	Not Rated	DIN 6885	1	000000000	0000
50mm	Undersized	-0.036mm to 0.000mm	-0.036mm to 0.000mm	Not Rated	DIN 6885	1	000000000	0000
55mm	Undersized	-0.036mm to 0.000mm	-0.036mm to 0.000mm	Not Rated	DIN 6885	1	000000000	0000
56mm	Undersized	-0.036mm to 0.000mm	-0.036mm to 0.000mm	Not Rated	DIN 6885	1	000000000	0000
70mm	Undersized	-0.036mm to 0.000mm	-0.036mm to 0.000mm	Not Rated	DIN 6885	1	000000000	00000
90mm	Undersized	-0.036mm to 0.000mm	-0.036mm to 0.000mm	Not Rated	DIN 6885	1	000000000	00000
125mm	Undersized	-0.036mm to 0.000mm	-0.036mm to 0.000mm	Not Rated	DIN 6885	1	000000000	00000

Tapered Gib Keys

These keys have a tapered body that wedges in to the keyway for a more secure fit than standard machine keys. The gib head makes these keys easy to remove when parts need to be taken apart frequently, such as for maintenance or prototyping. Keys are tapered along their length. Use them to connect gears and other components with tapered keyways to shafts. Keys are made of steel.

The height of metric keys decreases by 1 mm for every 100 mm of length. They meet DIN 6887, an international standard for machine keys.

For technical drawings and 3-D models, click on a part number.

	Tolerance		Head
Lg.	Ht.	Wd.	Ht.	Lg.	End Ht.	Rate of Taper	Specifications Met		Each
1018-1045 Carbon Steel
8mm × 10mm
60mm	0.000mm to 0.200mm	-0.036mm to 0.000mm	12mm	10mm	7.480mm	1 mm per 100 mm	DIN 6887	000000000	000000

Tapped Rounded Machine Keys

Thread a screw through the tapped hole to pop these keys out of a keyway. When installed, they fill oval keyways completely, reducing stress on the key and shaft. Using them in a closed keyway keeps them from sliding along the shaft axis. The rounded ends make it easy to slide gears, hubs, and other components into place. To install, press them in to place. Use them for permanent or high-torque applications, or to replace a key in a worn keyway. Keys are made of steel.

Undersized keys are good when you need a slightly looser fit or when you have an inconsistent keyway. Use them with parts you take apart frequently, such as for maintenance or prototyping. They meet DIN 6885 dimensional standards for undersized keys.

For technical drawings and 3-D models, click on a part number.

		Tolerance
Lg.	Tolerance Rating	Ht.	Wd.	Thread Size	Specifications Met		Each
1018-1045 Carbon Steel
8 mm × 10 mm
20mm	Undersized	-0.036mm to 0.000mm	-0.036mm to 0.000mm	M3 × 0.5 mm	DIN 6885	000000000	00000
30mm	Undersized	-0.036mm to 0.000mm	-0.036mm to 0.000mm	M3 × 0.5 mm	DIN 6885	000000000	0000
36mm	Undersized	-0.036mm to 0.000mm	-0.036mm to 0.000mm	M3 × 0.5 mm	DIN 6885	000000000	0000
40mm	Undersized	-0.036mm to 0.000mm	-0.036mm to 0.000mm	M3 × 0.5 mm	DIN 6885	000000000	0000
50mm	Undersized	-0.036mm to 0.000mm	-0.036mm to 0.000mm	M3 × 0.5 mm	DIN 6885	000000000	0000
56mm	Undersized	-0.036mm to 0.000mm	-0.036mm to 0.000mm	M3 × 0.5 mm	DIN 6885	000000000	0000

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.

Steel key stock is an economical choice with good strength. Zinc-plated steel key stock resists corrosion in wet environments. 4140 alloy steel key stock has greater strength and toughness after hardening than carbon steel, making it useful for high-stress applications.

Stainless steel key stock is more corrosion resistant than steel key stock. 18-8 stainless steel key stock offers a balance of strength and corrosion resistance. It may be mildly magnetic. 304 stainless steel key stock offers a good balance of strength, corrosion resistance, and machinability. 316 stainless steel key stock has the best corrosion resistance of our stainless steel key stock and may be mildly magnetic. 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. 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.

Key stock that meets DIN 6880 conforms to DIN standards for undersized keys.

For technical drawings and 3-D models, click on a part number.

1008-1045 Carbon Steel

		Tolerance
Ht. × Wd.	Tolerance Rating	Ht.	Wd.	Minimum Hardness	Specifications Met		Each
305mm Lg.
6mm × 10mm	Oversized	0.000mm to 0.076mm	0.000mm to 0.076mm	Rockwell B87	__	000000000	000000
6mm × 10mm	Undersized	-0.030mm to 0.000mm	-0.036mm to 0.000mm	Rockwell B87	DIN 6880	000000000	0000
8mm × 10mm	Oversized	0.000mm to 0.076mm	0.000mm to 0.076mm	Rockwell B87	__	000000000	0000
8mm × 10mm	Undersized	-0.036mm to 0.000mm	-0.043mm to 0.000mm	Rockwell B87	DIN 6880	000000000	0000
10mm × 10mm	Oversized	0.000mm to 0.076mm	0.000mm to 0.076mm	Rockwell B87	__	000000000	00000
10mm × 10mm	Undersized	-0.036mm to 0.000mm	-0.036mm to 0.000mm	Rockwell B87	DIN 6880	000000000	0000
1,000mm Lg.
6mm × 10mm	Undersized	-0.030mm to 0.000mm	-0.036mm to 0.000mm	Rockwell B87	DIN 6880	000000000	00000
8mm × 10mm	Undersized	-0.036mm to 0.000mm	-0.036mm to 0.000mm	Rockwell B87	DIN 6880	000000000	00000
10mm × 10mm	Undersized	-0.036mm to 0.000mm	-0.036mm to 0.000mm	Rockwell B87	DIN 6880	000000000	00000

Zinc-Plated 1008-1045 Carbon Steel

		Tolerance
Ht. × Wd.	Tolerance Rating	Ht.	Wd.	Minimum Hardness		Each
305mm Lg.
6mm × 10mm	Oversized	0.000mm to 0.076mm	0.000mm to 0.076mm	Rockwell B87	000000000	000000
8mm × 10mm	Oversized	0.000mm to 0.076mm	0.000mm to 0.076mm	Rockwell B87	000000000	0000
10mm × 10mm	Oversized	0.000mm to 0.076mm	0.000mm to 0.076mm	Rockwell B87	000000000	00000

Zinc Yellow-Chromate Plated 1008-1045 Carbon Steel

		Tolerance
Ht. × Wd.	Tolerance Rating	Ht.	Wd.	Minimum Hardness	Specifications Met		Each
305mm Lg.
8mm × 10mm	Undersized	-0.036mm to 0.000mm	-0.036mm to 0.000mm	Rockwell B87	DIN 6880	000000000	00000
10mm × 10mm	Undersized	-0.036mm to 0.000mm	-0.036mm to 0.000mm	Rockwell B87	DIN 6880	000000000	00000

4140 Alloy Steel

		Tolerance
Ht. × Wd.	Tolerance Rating	Ht.	Wd.	Minimum Hardness	Specifications Met		Each
12" Lg.
8mm × 10mm	Undersized	-0.036mm to 0.000mm	-0.036mm to 0.000mm	Rockwell B90	DIN 6880	000000000	000000
305mm Lg.
8mm × 10mm	Undersized	-0.036mm to 0.000mm	-0.036mm to 0.000mm	Rockwell B90	DIN 6880	000000000	00000

18-8 Stainless Steel

		Tolerance
Ht. × Wd.	Tolerance Rating	Ht.	Wd.	Minimum Hardness	Specifications Met		Each
305mm Lg.
8mm × 10mm	Oversized	0.000mm to 0.076mm	0.000mm to 0.076mm	Rockwell B82	DIN 174	000000000	000000
10mm × 10mm	Oversized	0.000mm to 0.076mm	0.000mm to 0.076mm	Rockwell B82	DIN 178	000000000	00000
10mm × 10mm	Undersized	-0.090mm to 0.000mm	-0.090mm to 0.000mm	Rockwell B82	DIN 178	000000000	00000

304 Stainless Steel

		Tolerance
Ht. × Wd.	Tolerance Rating	Ht.	Wd.	Minimum Hardness	Specifications Met		Each
305mm Lg.
6mm × 10mm	Undersized	-0.030mm to 0.000mm	-0.036mm to 0.000mm	Rockwell B80	DIN 6880	000000000	000000
8mm × 10mm	Undersized	-0.036mm to 0.000mm	-0.036mm to 0.000mm	Rockwell B80	DIN 6880	000000000	00000
1,000mm Lg.
8mm × 10mm	Undersized	-0.036mm to 0.000mm	-0.036mm to 0.000mm	Rockwell B80	DIN 6880	000000000	00000

316 Stainless Steel

		Tolerance
Ht. × Wd.	Tolerance Rating	Ht.	Wd.	Minimum Hardness	Specifications Met		Each
305mm Lg.
8mm × 10mm	Undersized	-0.036mm to 0.000mm	-0.036mm to 0.000mm	Rockwell B86	DIN 6880	000000000	000000
10mm × 10mm	Oversized	0.000mm to 0.076mm	0.000mm to 0.076mm	Not Rated	__	000000000	00000
10mm × 10mm	Undersized	-0.036mm to 0.000mm	-0.036mm to 0.000mm	Rockwell B86	DIN 6880	000000000	00000
1,000mm Lg.
8mm × 10mm	Undersized	-0.036mm to 0.000mm	-0.036mm to 0.000mm	Rockwell B85	DIN 6880	000000000	00000
10mm × 10mm	Undersized	-0.036mm to 0.000mm	-0.036mm to 0.000mm	Rockwell B85	DIN 6880	000000000	00000

Fixture Keys

Rectangular

Sized to fit with precision in machine table T-slots, use these keys to locate fixtures and vises on your machine table. They mount to the underside of your fixture or vise with a socket head cap screw.

For technical drawings and 3-D models, click on a part number.

Metric

Rectangular
For Machine Table T-Slot Wd., mm	Lg., mm	Wd., mm	Ht., mm	Wd. Tolerance, mm	For Mounting Screw Size	Mounting Fasteners Included	Material		Each
10	20	10	8	-0.0009 to 0	M4	No	Steel	0000000	00000