1/4" Gears | McMaster-Carr

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System of Measurement

Shaft Diameter

Roller Chain Trade Number

Number of Teeth

Pitch

Shaft Type

Bore Type

Shaft Mount Type

Material

Overall Width

Hub Diameter

Strand Type

Chain Standard

Keyway Width

Width

Sprocket Type

Keyway Depth

Chain Type

Bearing Type

DFARS Specialty Metals

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REACH

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Not Compliant

Export Control Classification Number (ECCN)

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Bearing Seal Type

199 Products

Sprockets

For Single Strand

Sprocket teeth mesh with your roller chain to smoothly transmit power. These U.S.-made sprockets have machined teeth for a more precise fit than flame-cut or punched teeth, allowing them to glide in and out of the chain to reduce wear and extend chain life.

Steel—Steel is strong, but best for dry environments since moisture will cause it to rust.

Corrosion-Resistant 18-8 Stainless Steel—Won't corrode from frequent washdowns and mild chemicals, including ammonia often found in cleaning solutions.

Finished Bore—Mount these sprockets onto your shaft and secure with a set screw—no machining required.

Plain Bore—Plain bore sprockets give you options—machine a custom bore, weld, or press-fit them in place. They're sized to the minimum shaft diameter listed and are machinable up to the maximum.

	For Roller Chain							Keyway
	Trade No.	Std.	Pitch	No. of Teeth	OD	Bore Type	For Shaft Dia.	Wd.	Dp.		Each
For Single Strand







				Steel

				25	ANSI	1/4"	9	0.84"	Finished	1/4"	—	—	000000	000000


				25	ANSI	1/4"	9	0.84"	Plain	1/4"	—	—	000000	00000
				25	ANSI	1/4"	10	0.92"	Finished	1/4"	—	—	000000	00000
				25	ANSI	1/4"	10	0.92"	Plain	1/4"	—	—	000000	00000
				25	ANSI	1/4"	11	1"	Finished	1/4"	—	—	000000	00000
				25	ANSI	1/4"	11	1"	Finished	3/8"	3/32"	3/64"	00000000	000000
				25	ANSI	1/4"	11	1"	Plain	1/4" to 5/16"	—	—	000000	00000
				25	ANSI	1/4"	12	1.08"	Finished	1/4"	—	—	00000000	00000
				25	ANSI	1/4"	12	1.08"	Finished	3/8"	—	—	00000000	00000
				25	ANSI	1/4"	12	1.08"	Plain	1/4" to 3/8"	—	—	000000	00000
				25	ANSI	1/4"	13	1.17"	Finished	1/4"	—	—	00000000	00000


				25	ANSI	1/4"	13	1.17"	Finished	3/8"	—	—	00000000	00000
				25	ANSI	1/4"	13	1.17"	Finished	1/2"	1/8"	1/16"	00000000	000000
				25	ANSI	1/4"	13	1.17"	Plain	1/4" to 7/16"	—	—	000000	00000
				25	ANSI	1/4"	14	1.25"	Finished	1/4"	—	—	00000000	00000
				25	ANSI	1/4"	14	1.25"	Finished	3/8"	—	—	00000000	00000
				25	ANSI	1/4"	14	1.25"	Finished	1/2"	—	—	00000000	00000
				25	ANSI	1/4"	14	1.25"	Plain	1/4" to 9/16"	—	—	000000	00000
				25	ANSI	1/4"	15	1.33"	Finished	1/4"	—	—	00000000	00000
				25	ANSI	1/4"	15	1.33"	Finished	3/8"	—	—	00000000	00000
				25	ANSI	1/4"	15	1.33"	Finished	1/2"	—	—	00000000	00000


				25	ANSI	1/4"	15	1.33"	Finished	5/8"	3/16"	3/32"	00000000	000000
				25	ANSI	1/4"	15	1.33"	Plain	1/4" to 9/16"	—	—	000000	00000
				25	ANSI	1/4"	16	1.41"	Finished	1/4"	—	—	00000000	00000
				25	ANSI	1/4"	16	1.41"	Finished	3/8"	—	—	00000000	00000
				25	ANSI	1/4"	16	1.41"	Finished	1/2"	—	—	00000000	00000
				25	ANSI	1/4"	16	1.41"	Finished	5/8"	3/16"	3/32"	00000000	000000
				25	ANSI	1/4"	16	1.41"	Plain	1/4" to 9/16"	—	—	000000	00000
				25	ANSI	1/4"	17	1.49"	Finished	1/4"	—	—	00000000	00000
				25	ANSI	1/4"	17	1.49"	Finished	3/8"	—	—	00000000	00000
				25	ANSI	1/4"	17	1.49"	Finished	1/2"	—	—	00000000	00000


				25	ANSI	1/4"	17	1.49"	Finished	5/8"	3/16"	3/32"	00000000	00000
				25	ANSI	1/4"	17	1.49"	Finished	3/4"	3/16"	3/32"	00000000	000000
				25	ANSI	1/4"	17	1.49"	Plain	1/4" to 5/8"	—	—	000000	00000
				25	ANSI	1/4"	18	1.57"	Finished	1/4"	—	—	00000000	00000
				25	ANSI	1/4"	18	1.57"	Finished	3/8"	—	—	00000000	00000
				25	ANSI	1/4"	18	1.57"	Finished	1/2"	—	—	00000000	00000
				25	ANSI	1/4"	18	1.57"	Finished	5/8"	3/16"	3/32"	00000000	00000
				25	ANSI	1/4"	18	1.57"	Finished	3/4"	3/16"	3/32"	00000000	00000
				25	ANSI	1/4"	18	1.57"	Plain	1/4" to 3/4"	—	—	0000000	00000
				25	ANSI	1/4"	19	1.65"	Finished	1/4"	—	—	00000000	00000


				25	ANSI	1/4"	19	1.65"	Finished	3/8"	—	—	00000000	00000
				25	ANSI	1/4"	19	1.65"	Finished	1/2"	—	—	00000000	00000
				25	ANSI	1/4"	19	1.65"	Finished	5/8"	3/16"	3/32"	00000000	00000
				25	ANSI	1/4"	19	1.65"	Finished	3/4"	3/16"	3/32"	00000000	00000
25				ANSI	1/4"	19	1.65"	Plain	1/4" to 13/16"	—	—	0000000	00000
25	ANSI			1/4"	20	1.73"	Finished	1/4"	—	—	00000000	00000
25	ANSI			1/4"	20	1.73"	Finished	3/8"	—	—	00000000	00000
25	ANSI			1/4"	20	1.73"	Finished	1/2"	—	—	00000000	00000
25	ANSI			1/4"	20	1.73"	Finished	5/8"	3/16"	3/32"	00000000	00000
25	ANSI	1/4"		20	1.73"	Finished	3/4"	3/16"	3/32"	00000000	00000
25	ANSI	1/4"	20	1.73"	Finished	7/8"	3/16"	3/32"	00000000	00000
25	ANSI	1/4"	20	1.73"	Plain	1/4" to 7/8"	—	—	0000000	00000
25	ANSI	1/4"	21	1.81"	Finished	1/4"	—	—	00000000	00000
25	ANSI	1/4"	21	1.81"	Finished	3/8"	—	—	00000000	00000
25	ANSI	1/4"	21	1.81"	Finished	1/2"	—	—	00000000	00000
25	ANSI	1/4"	21	1.81"	Finished	5/8"	3/16"	3/32"	00000000	00000
25	ANSI	1/4"	21	1.81"	Finished	3/4"	3/16"	3/32"	00000000	00000
25	ANSI	1/4"	21	1.81"	Finished	7/8"	3/16"	3/32"	00000000	00000
25	ANSI	1/4"	21	1.81"	Plain	1/4" to 7/8"	—	—	0000000	00000
25	ANSI	1/4"	22	1.89"	Finished	1/4"	—	—	00000000	00000
25	ANSI	1/4"	22	1.89"	Finished	3/8"	—	—	00000000	00000
25	ANSI	1/4"	22	1.89"	Finished	1/2"	—	—	00000000	00000
25	ANSI	1/4"	22	1.89"	Finished	5/8"	3/16"	3/32"	00000000	00000
25	ANSI	1/4"	22	1.89"	Finished	3/4"	3/16"	3/32"	00000000	00000
25	ANSI	1/4"	22	1.89"	Finished	7/8"	3/16"	3/32"	00000000	00000
25	ANSI	1/4"	22	1.89"	Plain	1/4" to 15/16"	—	—	0000000	00000
25	ANSI	1/4"	23	1.97"	Finished	1/4"	—	—	00000000	00000
25	ANSI	1/4"	23	1.97"	Finished	3/8"	—	—	00000000	00000
25	ANSI	1/4"	23	1.97"	Finished	1/2"	—	—	00000000	00000
25	ANSI	1/4"	23	1.97"	Finished	5/8"	3/16"	3/32"	00000000	00000
25	ANSI	1/4"	23	1.97"	Finished	3/4"	3/16"	3/32"	00000000	00000
25	ANSI	1/4"	23	1.97"	Finished	7/8"	3/16"	3/32"	00000000	00000
25	ANSI	1/4"	23	1.97"	Finished	1"	1/4"	1/8"	00000000	00000
25	ANSI	1/4"	23	1.97"	Plain	1/4" to 1"	—	—	0000000	00000
25	ANSI	1/4"	24	2.05"	Finished	3/8"	—	—	00000000	00000
25	ANSI	1/4"	24	2.05"	Finished	1/2"	—	—	00000000	00000
25	ANSI	1/4"	24	2.05"	Finished	5/8"	3/16"	3/32"	00000000	00000
25	ANSI	1/4"	24	2.05"	Finished	3/4"	3/16"	3/32"	00000000	00000
25	ANSI	1/4"	24	2.05"	Finished	7/8"	3/16"	3/32"	00000000	00000
25	ANSI	1/4"	24	2.05"	Finished	1"	1/4"	1/8"	00000000	00000
25	ANSI	1/4"	24	2.05"	Plain	3/8" to 1"	—	—	0000000	00000
25	ANSI	1/4"	25	2.13"	Finished	3/8"	—	—	00000000	00000
25	ANSI	1/4"	25	2.13"	Finished	1/2"	—	—	00000000	00000
25	ANSI	1/4"	25	2.13"	Finished	5/8"	3/16"	3/32"	00000000	00000
25	ANSI	1/4"	25	2.13"	Finished	3/4"	3/16"	3/32"	00000000	00000
25	ANSI	1/4"	25	2.13"	Finished	7/8"	3/16"	3/32"	00000000	00000
25	ANSI	1/4"	25	2.13"	Finished	1"	1/4"	1/8"	00000000	00000
25	ANSI	1/4"	25	2.13"	Plain	3/8" to 1"	—	—	0000000	00000
25	ANSI	1/4"	26	2.21"	Finished	3/8"	—	—	00000000	00000
25	ANSI	1/4"	26	2.21"	Finished	1/2"	—	—	00000000	00000
25	ANSI	1/4"	26	2.21"	Finished	5/8"	3/16"	3/32"	00000000	00000
25	ANSI	1/4"	26	2.21"	Finished	3/4"	3/16"	3/32"	00000000	00000
25	ANSI	1/4"	26	2.21"	Finished	7/8"	3/16"	3/32"	00000000	00000
25	ANSI	1/4"	26	2.21"	Finished	1"	1/4"	1/8"	00000000	00000
25	ANSI	1/4"	28	2.37"	Finished	3/8"	—	—	00000000	00000
25	ANSI	1/4"	28	2.37"	Finished	1/2"	—	—	00000000	00000
25	ANSI	1/4"	28	2.37"	Finished	5/8"	3/16"	3/32"	00000000	00000
25	ANSI	1/4"	28	2.37"	Finished	3/4"	3/16"	3/32"	00000000	00000
25	ANSI	1/4"	28	2.37"	Finished	7/8"	3/16"	3/32"	00000000	00000
25	ANSI	1/4"	28	2.37"	Finished	1"	1/4"	1/8"	00000000	00000
25	ANSI	1/4"	30	2.53"	Finished	3/8"	—	—	00000000	00000
25	ANSI	1/4"	30	2.53"	Finished	1/2"	—	—	00000000	00000
25	ANSI	1/4"	30	2.53"	Finished	5/8"	3/16"	3/32"	00000000	00000
25	ANSI	1/4"	30	2.53"	Finished	3/4"	3/16"	3/32"	00000000	00000
25	ANSI	1/4"	30	2.53"	Finished	7/8"	3/16"	3/32"	00000000	00000
25	ANSI	1/4"	30	2.53"	Finished	1"	1/4"	1/8"	00000000	00000
25	ANSI	1/4"	30	2.53"	Plain	3/8" to 1"	—	—	0000000	00000
25	ANSI	1/4"	32	2.69"	Finished	3/8"	—	—	00000000	00000
25	ANSI	1/4"	32	2.69"	Finished	1/2"	—	—	00000000	00000
25	ANSI	1/4"	32	2.69"	Finished	5/8"	3/16"	3/32"	00000000	00000
25	ANSI	1/4"	32	2.69"	Finished	3/4"	3/16"	3/32"	00000000	00000
25	ANSI	1/4"	32	2.69"	Finished	7/8"	3/16"	3/32"	00000000	00000
25	ANSI	1/4"	32	2.69"	Finished	1"	1/4"	1/8"	00000000	00000
25	ANSI	1/4"	36	3.01"	Finished	3/8"	—	—	00000000	00000
25	ANSI	1/4"	36	3.01"	Finished	1/2"	—	—	00000000	00000
25	ANSI	1/4"	36	3.01"	Finished	5/8"	3/16"	3/32"	00000000	00000
25	ANSI	1/4"	36	3.01"	Finished	3/4"	3/16"	3/32"	00000000	00000
25	ANSI	1/4"	36	3.01"	Finished	7/8"	3/16"	3/32"	00000000	00000
25	ANSI	1/4"	36	3.01"	Finished	1"	1/4"	1/8"	00000000	00000
25	ANSI	1/4"	40	3.33"	Finished	1/2"	—	—	00000000	00000
25	ANSI	1/4"	40	3.33"	Finished	5/8"	3/16"	3/32"	00000000	00000
25	ANSI	1/4"	40	3.33"	Finished	3/4"	3/16"	3/32"	00000000	00000
25	ANSI	1/4"	40	3.33"	Finished	7/8"	3/16"	3/32"	00000000	00000
25	ANSI	1/4"	40	3.33"	Finished	1"	1/4"	1/8"	00000000	00000
25	ANSI	1/4"	40	3.33"	Finished	1 1/4"	1/4"	1/8"	00000000	00000
25	ANSI	1/4"	40	3.33"	Finished	1 3/8"	5/16"	5/32"	00000000	00000
25	ANSI	1/4"	40	3.33"	Plain	1/2" to 1 3/8"	—	—	0000000	00000
25	ANSI	1/4"	45	3.73"	Finished	1/2"	—	—	00000000	00000
25	ANSI	1/4"	45	3.73"	Finished	5/8"	3/16"	3/32"	00000000	00000
25	ANSI	1/4"	45	3.73"	Finished	3/4"	3/16"	3/32"	00000000	00000
25	ANSI	1/4"	45	3.73"	Finished	7/8"	3/16"	3/32"	00000000	00000
25	ANSI	1/4"	45	3.73"	Finished	1"	1/4"	1/8"	00000000	00000
25	ANSI	1/4"	45	3.73"	Finished	1 1/4"	1/4"	1/8"	00000000	00000
25	ANSI	1/4"	45	3.73"	Finished	1 3/8"	5/16"	5/32"	00000000	00000
25	ANSI	1/4"	45	3.73"	Plain	1/2" to 1 3/8"	—	—	0000000	00000
25	ANSI	1/4"	48	3.96"	Finished	1/2"	—	—	00000000	00000
25	ANSI	1/4"	48	3.96"	Finished	5/8"	3/16"	3/32"	00000000	00000
25	ANSI	1/4"	48	3.96"	Finished	3/4"	3/16"	3/32"	00000000	00000
25	ANSI	1/4"	48	3.96"	Finished	7/8"	3/16"	3/32"	00000000	00000
25	ANSI	1/4"	48	3.96"	Finished	1"	1/4"	1/8"	00000000	00000
25	ANSI	1/4"	48	3.96"	Finished	1 1/4"	1/4"	1/8"	00000000	00000
25	ANSI	1/4"	48	3.96"	Finished	1 3/8"	5/16"	5/32"	00000000	00000
25	ANSI	1/4"	54	4.44"	Finished	1/2"	—	—	00000000	00000
25	ANSI	1/4"	54	4.44"	Finished	5/8"	3/16"	3/32"	00000000	00000
25	ANSI	1/4"	54	4.44"	Finished	3/4"	3/16"	3/32"	00000000	00000
25	ANSI	1/4"	54	4.44"	Finished	7/8"	3/16"	3/32"	00000000	00000
25	ANSI	1/4"	54	4.44"	Finished	1"	1/4"	1/8"	00000000	00000
25	ANSI	1/4"	54	4.44"	Finished	1 1/4"	1/4"	1/8"	00000000	00000
25	ANSI	1/4"	54	4.44"	Finished	1 3/8"	5/16"	5/32"	00000000	00000
25	ANSI	1/4"	60	4.92"	Finished	1/2"	—	—	00000000	00000
25	ANSI	1/4"	60	4.92"	Finished	5/8"	3/16"	3/32"	00000000	00000
25	ANSI	1/4"	60	4.92"	Finished	3/4"	3/16"	3/32"	00000000	00000
25	ANSI	1/4"	60	4.92"	Finished	7/8"	3/16"	3/32"	00000000	00000
25	ANSI	1/4"	60	4.92"	Finished	1"	1/4"	1/8"	00000000	00000
25	ANSI	1/4"	60	4.92"	Finished	1 1/4"	1/4"	1/8"	00000000	00000
25	ANSI	1/4"	60	4.92"	Finished	1 3/8"	5/16"	5/32"	00000000	00000
25	ANSI	1/4"	60	4.92"	Plain	1/2" to 1 3/8"	—	—	0000000	00000
25	ANSI	1/4"	70	5.72"	Finished	1/2"	—	—	00000000	00000
25	ANSI	1/4"	70	5.72"	Finished	5/8"	3/16"	3/32"	00000000	00000
25	ANSI	1/4"	70	5.72"	Finished	3/4"	3/16"	3/32"	00000000	00000
25	ANSI	1/4"	70	5.72"	Finished	7/8"	3/16"	3/32"	00000000	00000
25	ANSI	1/4"	70	5.72"	Finished	1"	1/4"	1/8"	00000000	00000
25	ANSI	1/4"	70	5.72"	Finished	1 1/4"	1/4"	1/8"	00000000	00000
25	ANSI	1/4"	70	5.72"	Finished	1 3/8"	5/16"	5/32"	00000000	00000
25	ANSI	1/4"	72	5.88"	Finished	1/2"	—	—	00000000	00000
25	ANSI	1/4"	72	5.88"	Finished	5/8"	3/16"	3/32"	00000000	00000
25	ANSI	1/4"	72	5.88"	Finished	3/4"	3/16"	3/32"	00000000	00000
25	ANSI	1/4"	72	5.88"	Finished	7/8"	3/16"	3/32"	00000000	00000
25	ANSI	1/4"	72	5.88"	Finished	1"	1/4"	1/8"	00000000	00000
25	ANSI	1/4"	72	5.88"	Finished	1 1/4"	1/4"	1/8"	00000000	00000
25	ANSI	1/4"	72	5.88"	Finished	1 3/8"	5/16"	5/32"	00000000	00000



		Corrosion-Resistant 18-8 Stainless Steel

		25	ANSI	1/4"	10	0.92"	Plain	1/4"	—	—	000000	00000


		25	ANSI	1/4"	12	1.08"	Plain	1/4" to 3/8"	—	—	000000	00000
		25	ANSI	1/4"	13	1.17"	Plain	1/4" to 7/16"	—	—	000000	00000
		25	ANSI	1/4"	14	1.25"	Plain	1/4" to 9/16"	—	—	000000	00000
		25	ANSI	1/4"	15	1.33"	Plain	1/4" to 9/16"	—	—	000000	00000
		25	ANSI	1/4"	16	1.41"	Plain	1/4" to 9/16"	—	—	000000	00000
		25	ANSI	1/4"	18	1.57"	Plain	1/4" to 3/4"	—	—	0000000	00000
		25	ANSI	1/4"	20	1.73"	Plain	1/4" to 7/8"	—	—	0000000	00000
		25	ANSI	1/4"	24	2.05"	Plain	3/8" to 1"	—	—	0000000	00000

Plastic Sprockets

Quiet-running, lightweight, and naturally rust resistant. Choose these sprockets for noise-sensitive areas, designs with weight constraints, and machines that require frequent washdowns. Their teeth mesh with your roller chain to smoothly transmit power. All are made in the U.S.

	For Roller Chain
	Trade No.	Std.	Pitch	No. of Teeth	OD	Bore Type	For Shaft Dia.		Each
For Single Strand



		25	ANSI	1/4"	10	0.92"	Plain	1/4"	00000000	000000


		25	ANSI	1/4"	11	1"	Plain	1/4" to 5/16"	00000000	00000
		25	ANSI	1/4"	12	1.08"	Plain	1/4" to 3/8"	000000000	00000
		25	ANSI	1/4"	13	1.17"	Plain	1/4" to 7/16"	000000000	00000
		25	ANSI	1/4"	14	1.25"	Plain	5/16" to 1/2"	000000000	00000
		25	ANSI	1/4"	15	1.33"	Plain	5/16" to 1/2"	000000000	00000
		25	ANSI	1/4"	16	1.41"	Plain	5/16" to 1/2"	000000000	00000
		25	ANSI	1/4"	17	1.49"	Plain	5/16" to 1/2"	000000000	00000
		25	ANSI	1/4"	18	1.57"	Plain	3/8" to 1/2"	000000000	00000
		25	ANSI	1/4"	24	2.05"	Plain	3/8" to 13/16"	000000000	00000
		25	ANSI	1/4"	25	2.13"	Plain	1/2" to 1"	00000000	00000


		25	ANSI	1/4"	30	2.53"	Plain	1/2" to 7/8"	000000000	00000
		25	ANSI	1/4"	35	2.93"	Plain	1/2" to 1"	00000000	00000
		25	ANSI	1/4"	40	3.33"	Plain	1/2" to 7/8"	00000000	00000
		25	ANSI	1/4"	45	3.73"	Plain	1/2" to 1"	00000000	00000

Idler Sprockets

Maintain constant tension on your roller chain to reduce wear and vibration. These sprockets press against the chain to take up slack and rotate freely on bearings to keep the chain moving smoothly. They’re often paired with roller chain tensioners.

For Single Strand

Ball Bearing

Needle-Roller

Bearing

Ball Bearing—Smoother than smooth—the balls inside these bearings roll nearly friction-free to handle high speeds. All are sealed to keep lubricant in and dust out.

Needle-Roller Bearing—These bearings rotate smoothly under your heaviest loads.

Steel—Steel is strong, but best for dry environments since moisture will cause it to rust.

Wear-Resistant Steel with Hardened Teeth—These sprockets have teeth that are hardened from the tip to the base so they withstand chain contact and wear evenly. That means fewer broken teeth and a longer lifespan than sprockets with unhardened or tip-hardened teeth. Steel is best for dry environments since moisture will cause it to rust.

	For Roller Chain
	Trade No.	Std.	Pitch	No. of Teeth	For Shaft Dia.	OD	Bearing Material		Each
Ball Bearing







				Steel

				25	ANSI	1/4"	20	3/8"	1.73"	Steel	0000000	000000




						Wear-Resistant Steel with Hardened Teeth

						25	ANSI	1/4"	20	3/8"	1.73"	Steel	00000000	00000


						Needle-Roller Bearing







										Wear-Resistant Steel with Hardened Teeth

										25	ANSI	1/4"	19	1/2"	1.65"	Bronze	0000000	00000