70 Teeth Sprockets | McMaster-Carr

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Number of Teeth

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EAR99

DFARS Specialty Metals

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45 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.

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

	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"	70	5 3/4"	Finished	1/2"	—	—	00000000	000000


				25	ANSI	1/4"	70	5 3/4"	Finished	5/8"	3/16"	3/32"	00000000	00000
				25	ANSI	1/4"	70	5 3/4"	Finished	3/4"	3/16"	3/32"	00000000	00000
				25	ANSI	1/4"	70	5 3/4"	Finished	7/8"	3/16"	3/32"	00000000	00000
				25	ANSI	1/4"	70	5 3/4"	Finished	1"	1/4"	1/8"	00000000	00000
				25	ANSI	1/4"	70	5 3/4"	Finished	1 1/4"	1/4"	1/8"	00000000	00000
				25	ANSI	1/4"	70	5 3/4"	Finished	1 3/8"	5/16"	5/32"	00000000	00000
				40	ANSI	1/2"	70	11 7/16"	Finished	3/4"	3/16"	3/32"	00000000	000000
				40	ANSI	1/2"	70	11 7/16"	Finished	7/8"	3/16"	3/32"	00000000	000000
				40	ANSI	1/2"	70	11 7/16"	Finished	1"	1/4"	1/8"	00000000	000000
				40	ANSI	1/2"	70	11 7/16"	Finished	1 1/4"	1/4"	1/8"	00000000	000000


				40	ANSI	1/2"	70	11 7/16"	Finished	1 3/8"	5/16"	5/32"	00000000	000000
				40	ANSI	1/2"	70	11 7/16"	Finished	1 1/2"	3/8"	3/16"	00000000	000000
				41	ANSI	1/2"	70	11 7/16"	Finished	3/4"	3/16"	3/32"	00000000	000000
				41	ANSI	1/2"	70	11 7/16"	Finished	1"	1/4"	1/8"	00000000	000000
				41	ANSI	1/2"	70	11 7/16"	Finished	1 1/4"	1/4"	1/8"	00000000	000000
				41	ANSI	1/2"	70	11 7/16"	Finished	1 1/2"	3/8"	3/16"	00000000	000000
				50	ANSI	5/8"	70	14 5/16"	Finished	1"	1/4"	1/8"	00000000	000000
				50	ANSI	5/8"	70	14 5/16"	Finished	1 1/8"	1/4"	1/8"	00000000	000000
				50	ANSI	5/8"	70	14 5/16"	Finished	1 3/16"	1/4"	1/8"	00000000	000000
				50	ANSI	5/8"	70	14 5/16"	Finished	1 1/4"	1/4"	1/8"	00000000	000000


				50	ANSI	5/8"	70	14 5/16"	Finished	1 3/8"	5/16"	5/32"	00000000	000000
				50	ANSI	5/8"	70	14 5/16"	Finished	1 7/16"	3/8"	3/16"	00000000	000000
				50	ANSI	5/8"	70	14 5/16"	Finished	1 1/2"	3/8"	3/16"	00000000	000000
				50	ANSI	5/8"	70	14 5/16"	Finished	1 5/8"	3/8"	3/16"	00000000	000000
				50	ANSI	5/8"	70	14 5/16"	Finished	1 3/4"	3/8"	3/16"	00000000	000000
				50	ANSI	5/8"	70	14 5/16"	Finished	1 15/16"	1/2"	1/4"	00000000	000000
				60	ANSI	3/4"	70	17 1/8"	Finished	1 3/8"	5/16"	5/32"	00000000	000000
				60	ANSI	3/4"	70	17 1/8"	Finished	1 7/16"	3/8"	3/16"	00000000	000000
				60	ANSI	3/4"	70	17 1/8"	Finished	1 1/2"	3/8"	3/16"	00000000	000000
				60	ANSI	3/4"	70	17 1/8"	Finished	1 5/8"	3/8"	3/16"	00000000	000000


				60	ANSI	3/4"	70	17 1/8"	Finished	1 3/4"	3/8"	3/16"	00000000	000000
				60	ANSI	3/4"	70	17 1/8"	Finished	1 15/16"	1/2"	1/4"	00000000	000000
				60	ANSI	3/4"	70	17 1/8"	Finished	2"	1/2"	1/4"	00000000	000000
				60	ANSI	3/4"	70	17 1/8"	Finished	2 3/16"	1/2"	1/4"	00000000	000000
				60	ANSI	3/4"	70	17 1/8"	Finished	2 7/16"	5/8"	5/16"	00000000	000000

Plastic Spur Gears

Made of plastic, these spur gears run more quietly than metal gears and have good corrosion and chemical resistance. However, they’re not as strong as metal gears, so they’re best for light duty applications. Combine a gear and rack to convert rotary motion into linear motion.

Combine gears with different numbers of teeth to change speed and torque in your assembly. For components to mesh correctly, they must have the same pressure angle and pitch/module.

Gears

20° Pressure

Angle

20° Pressure Angle—The current industry standard, these 20° pressure angle spur gears have thicker, stronger teeth than 14½° pressure angle gears.

Acetal—Acetal gears absorb less water than nylon gears, so they’re less likely to swell.

						Hub, mm
	Gear Module	No. of Teeth	Gear Pitch Dia., mm	OD, mm	Face Wd., mm	Dia.	Wd.	Bore Type	For Shaft Dia., mm	Color		Each
20° Pressure Angle







				Acetal

				0.5	70	35	36	3	14	5	Round Bore	6	White	00000000	00000


				1	70	70	72	6	18	8	Round Bore	8	White	00000000	00000

Gear Racks

20° Pressure Angle—Rectangular

These racks match with spur gears to convert rotary motion to linear motion. For components to mesh correctly, they must have the same pressure angle and pitch/module.

Acetal—Acetal gear racks absorb less water than nylon racks, so they’re less likely to swell.

Machined—Machined gear racks may be slightly bowed but will straighten out when installed.

	Ht., mm	Face Wd., mm	Fabrication	Color		Each
20° Pressure Angle—Rectangular







	Acetal

	0.5	250	5.9	6.3	4	Molded	Gray	0000000	00000


	1	315	7.9	10	10	Molded	Gray	0000000	0000
	1	500	11	12	10	Machined	White	0000000	000000

Metal Spur Gears

Our strongest spur gears for transferring motion. They’re better than plastic gears for high-load, high-speed, and heavy duty applications. Combine a gear and rack to convert rotary motion into linear motion. To minimize your footprint, mount one or more standard gears inside of an internal gear.

Combine gears with different numbers of teeth to change speed and torque in your assembly. For components to mesh correctly, they must have the same pressure angle and pitch/module.

Gears

Gear with Round

Bore and Set Screw

20° Pressure Angle—The current industry standard, these 20° pressure angle spur gears have thicker, stronger teeth than 14½° pressure angle gears.

Steel—Steel gears have hard, strong, and wear-resistant teeth, although they will rust when exposed to moisture and corrosive chemicals.

Brass—Brass gears are easy to machine, so you can add your own mounting holes and make other alterations. They won't rust when exposed to water.

						Hub, mm
	Gear Module	No. of Teeth	Gear Pitch Dia., mm	OD, mm	Face Wd., mm	Dia.	Wd.	Bore Type	For Shaft Dia., mm	Tooth Heat Treatment	Material		Each
20° Pressure Angle







				Steel

				0.8	70	56	57.6	8	28	8	Round Bore with Set Screw	6	Not Hardened	Black-Oxide 1045 Carbon Steel	00000000	000000




						Brass

						0.5	70	35	36	3	28	7	Round Bore with Set Screw	6	—	Brass	00000000	00000

Gear Racks

20° Pressure Angle—Rectangular

These racks match with spur gears to convert rotary motion to linear motion. For components to mesh correctly, they must have the same pressure angle and pitch/module.

Steel—Steel gear racks have strong and wear-resistant teeth, although they will rust when exposed to moisture and corrosive chemicals.

Brass—Brass gear racks are easy to machine, so you can add your own mounting holes and make other alterations. They won't rust when exposed to water.

	Ht., mm	Face Wd., mm	Tooth Heat Treatment	Material		Each
20° Pressure Angle—Rectangular







	Steel

	0.8	100	11.5	12.3	8	Not Hardened	Black-Oxide 1045 Carbon Steel	00000000	000000




			Brass

			0.5	300	8.5	9	3	—	Brass	00000000	00000