ASME B17.1 Class 2 Machine Keys

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1008-1045 Carbon Steel

1018-1045 Carbon Steel

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53 Products

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.

1008-1045 Carbon Steel—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.

Zinc-Plated 1008-1045 Carbon Steel— Zinc-plated steel keys resist corrosion in wet environments.

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

ASME B17.1 Class 2—Keys that meet ASME B17.1 specifications conform to ASME standards for dimensions and tolerances.

			Tolerance
	Lg.	Tolerance Rating	Ht.	Wd.	Min. Hardness	Specs. Met	Pkg. Qty.		Pkg.
1008-1045 Carbon Steel







				1/8" × 1/8"

				1/2"	Oversized	0.000" to 0.001"	0.000" to 0.001"	Not Rated	ASME B17.1 Class 2	5	98870A232	00000


				3/4"	Oversized	0.000" to 0.001"	0.000" to 0.001"	Not Rated	ASME B17.1 Class 2	5	98870A333	0000
				1"	Oversized	0.000" to 0.001"	0.000" to 0.001"	Not Rated	ASME B17.1 Class 2	5	98870A337	0000




						3/16" × 3/16"

						1"	Oversized	0.000" to 0.001"	0.000" to 0.001"	Not Rated	ASME B17.1 Class 2	5	98870A357	0000


						1 1/4"	Oversized	0.000" to 0.001"	0.000" to 0.001"	Not Rated	ASME B17.1 Class 2	5	98870A421	0000
						2"	Oversized	0.000" to 0.001"	0.000" to 0.001"	Not Rated	ASME B17.1 Class 2	5	98870A486	0000




								1/4" × 1/4"

								3/4"	Oversized	0.000" to 0.001"	0.000" to 0.001"	Not Rated	ASME B17.1 Class 2	5	98870A527	0000


								1"	Oversized	0.000" to 0.001"	0.000" to 0.001"	Not Rated	ASME B17.1 Class 2	5	98870A552	0000
								1 1/4"	Oversized	0.000" to 0.001"	0.000" to 0.001"	Not Rated	ASME B17.1 Class 2	5	98870A690	0000
								1 1/2"	Oversized	0.000" to 0.001"	0.000" to 0.001"	Not Rated	ASME B17.1 Class 2	5	98870A699	0000
								1 3/4"	Oversized	0.000" to 0.001"	0.000" to 0.001"	Not Rated	ASME B17.1 Class 2	5	98870A728	0000
								2"	Oversized	0.000" to 0.001"	0.000" to 0.001"	Not Rated	ASME B17.1 Class 2	5	98870A836	0000
								2 1/2"	Oversized	0.000" to 0.001"	0.000" to 0.001"	Not Rated	ASME B17.1 Class 2	5	98870A949	0000




										1/2" × 1/2"

										1 1/2"	Oversized	0.000" to 0.001"	0.000" to 0.001"	Not Rated	ASME B17.1 Class 2	1	98870A959	0000


										1 5/8"	Oversized	0.000" to 0.001"	0.000" to 0.001"	Not Rated	ASME B17.1 Class 2	1	98870A969	0000
										2 1/2"	Oversized	0.000" to 0.001"	0.000" to 0.001"	Not Rated	ASME B17.1 Class 2	1	98870A697	0000


										Zinc-Plated 1008-1045 Carbon Steel







														1/8" × 1/8"

														1/2"	Oversized	0.000" to 0.001"	0.000" to 0.001"	Not Rated	ASME B17.1 Class 2	5	95053A379	00000


1"	Oversized													0.000" to 0.001"	0.000" to 0.001"	Not Rated	ASME B17.1 Class 2	5	95053A292	00000




		3/16" × 3/16"

		1/2"	Oversized											0.000" to 0.002"	0.000" to 0.002"	Rockwell B50	ASME B17.1 Class 2	5	95053A313	0000


		3/4"	Oversized											0.000" to 0.002"	0.000" to 0.002"	Rockwell B50	ASME B17.1 Class 2	5	95053A934	0000
		1"	Oversized											0.000" to 0.001"	0.000" to 0.001"	Not Rated	ASME B17.1 Class 2	5	95053A314	00000




				1/4" × 1/4"

				1"	Oversized									0.000" to 0.001"	0.000" to 0.001"	Not Rated	ASME B17.1 Class 2	5	95053A278	00000


				1 1/2"	Oversized									0.000" to 0.001"	0.000" to 0.001"	Not Rated	ASME B17.1 Class 2	5	95053A231	00000

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.

Oversized Tolerance—Oversized keys create a tight fit. They conform to ASME B17.1 Class 2 standards for dimensions and tolerances.

			Tolerance
	Lg.	Tolerance Rating	Ht.	Wd.	Min. Hardness	Thread Size	Specs. Met		Each
1018-1045 Carbon Steel







				3/16" × 3/16"

				1/2"	Oversized	0.000" to 0.001"	0.000" to 0.001"	Not Rated	4-40	ASME B17.1 Class 2	90164A231	00000


				3/4"	Oversized	0.000" to 0.001"	0.000" to 0.001"	Not Rated	4-40	ASME B17.1 Class 2	90164A314	0000
				1"	Oversized	0.000" to 0.001"	0.000" to 0.001"	Not Rated	4-40	ASME B17.1 Class 2	90164A315	0000
				1 1/2"	Oversized	0.000" to 0.001"	0.000" to 0.001"	Not Rated	4-40	ASME B17.1 Class 2	90164A407	0000
				1 3/4"	Oversized	0.000" to 0.001"	0.000" to 0.001"	Not Rated	4-40	ASME B17.1 Class 2	90164A481	0000
				2"	Oversized	0.000" to 0.001"	0.000" to 0.001"	Not Rated	4-40	ASME B17.1 Class 2	90164A569	0000




						1/4" × 1/4"

						3/4"	Oversized	0.000" to 0.001"	0.000" to 0.001"	Not Rated	6-32	ASME B17.1 Class 2	90164A625	0000


						1"	Oversized	0.000" to 0.001"	0.000" to 0.001"	Not Rated	6-32	ASME B17.1 Class 2	90164A635	0000
						1 1/4"	Oversized	0.000" to 0.001"	0.000" to 0.001"	Not Rated	6-32	ASME B17.1 Class 2	90164A655	0000
						1 1/2"	Oversized	0.000" to 0.001"	0.000" to 0.001"	Not Rated	6-32	ASME B17.1 Class 2	90164A746	0000
						1 3/4"	Oversized	0.000" to 0.001"	0.000" to 0.001"	Not Rated	6-32	ASME B17.1 Class 2	90164A797	0000
						2"	Oversized	0.000" to 0.001"	0.000" to 0.001"	Not Rated	6-32	ASME B17.1 Class 2	90164A801	0000
						2 1/2"	Oversized	0.000" to 0.001"	0.000" to 0.001"	Not Rated	6-32	ASME B17.1 Class 2	90164A807	0000




								3/8" × 3/8"

								1 1/2"	Oversized	0.000" to 0.001"	0.000" to 0.001"	Not Rated	10-24	ASME B17.1 Class 2	90164A862	0000


								2"	Oversized	0.000" to 0.001"	0.000" to 0.001"	Not Rated	10-24	ASME B17.1 Class 2	90164A871	0000




										1/2" × 1/2"

										2"	Oversized	0.000" to 0.001"	0.000" to 0.001"	Not Rated	1/4"-20	ASME B17.1 Class 2	90164A901	0000

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.

Zinc-Plated 1008-1045 Carbon Steel— Zinc-plated steel keys resist corrosion in wet environments.

ASME B17.1 Class 2—Keys that meet ASME B17.1 specifications conform to ASME standards for dimensions and tolerances.

			Tolerance
	Lg.	Tolerance Rating	Ht.	Wd.	Min. Hardness	Specs. Met	Pkg. Qty.		Pkg.
1008-1045 Carbon Steel







				3/16" × 3/16"

				1 3/8"	Oversized	0.000" to 0.001"	0.000" to 0.001"	Not Rated	ASME B17.1 Class 2	5	98870A322	00000




						1/4" × 1/4"

						3"	Oversized	0.000" to 0.001"	0.000" to 0.001"	Not Rated	ASME B17.1 Class 2	5	98870A332	0000


						5"	Oversized	0.000" to 0.001"	0.000" to 0.001"	Not Rated	ASME B17.1 Class 2	5	98870A334	0000




								5/16" × 5/16"

								1 1/4"	Oversized	0.000" to 0.001"	0.000" to 0.001"	Not Rated	ASME B17.1 Class 2	5	98870A324	0000




										3/8" × 3/8"

										1 1/2"	Oversized	0.000" to 0.001"	0.000" to 0.001"	Not Rated	ASME B17.1 Class 2	5	98870A323	0000


										2 1/2"	Oversized	0.000" to 0.001"	0.000" to 0.001"	Not Rated	ASME B17.1 Class 2	5	98870A331	0000




												1/2" × 1/2"

												2 1/2"	Oversized	0.000" to 0.001"	0.000" to 0.001"	Not Rated	ASME B17.1 Class 2	5	98870A325	00000


												Zinc-Plated 1008-1045 Carbon Steel







																3/16" × 3/16"

																1 3/8"	Oversized	0.000" to 0.002"	0.000" to 0.002"	Rockwell B50	ASME B17.1 Class 2	10	4732N12	00000

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.

8630 Alloy Steel

8630 alloy steel key stock is an economical choice with good strength.

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.

ASME B17.1 Class 2—Key stock that meets ASME B17.1 Class 2 specifications conforms to ASME standards for dimensions and tolerances.

			Tolerance
	Ht. × Wd.	Tolerance Rating	Ht.	Wd.	Min. Hardness	Specs. Met		Each
12" Long



		1/8" × 1/8"	Oversized	0.000" to 0.001"	0.000" to 0.001"	Rockwell B50	ASME B17.1 Class 2	99020A415	00000


		3/16" × 3/16"	Oversized	0.000" to 0.001"	0.000" to 0.001"	Rockwell B50	ASME B17.1 Class 2	99020A420	0000
		1/4" × 1/4"	Oversized	0.000" to 0.001"	0.000" to 0.001"	Rockwell B50	ASME B17.1 Class 2	99020A425	0000
		5/16" × 5/16"	Oversized	0.000" to 0.001"	0.000" to 0.001"	Rockwell B50	ASME B17.1 Class 2	99020A430	0000
		3/8" × 3/8"	Oversized	0.000" to 0.001"	0.000" to 0.001"	Rockwell B50	ASME B17.1 Class 2	99020A435	0000
		1/2" × 1/2"	Oversized	0.000" to 0.001"	0.000" to 0.001"	Rockwell B50	ASME B17.1 Class 2	99020A440	0000