42 Teeth Sprockets | McMaster-Carr

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72 Products

Sprockets


For Single Strand	For Double 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.

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

				40	ANSI	1/2"	42	7"	Finished	3/4"	3/16"	3/32"	00000000	000000


				40	ANSI	1/2"	42	7"	Finished	7/8"	3/16"	3/32"	00000000	00000
				40	ANSI	1/2"	42	7"	Finished	1"	1/4"	1/8"	00000000	00000
				40	ANSI	1/2"	42	7"	Finished	1 1/8"	1/4"	1/8"	00000000	00000
				40	ANSI	1/2"	42	7"	Finished	1 3/16"	1/4"	1/8"	00000000	00000
				40	ANSI	1/2"	42	7"	Finished	1 1/4"	1/4"	1/8"	00000000	00000
				40	ANSI	1/2"	42	7"	Finished	1 3/8"	5/16"	5/32"	00000000	00000
				40	ANSI	1/2"	42	7"	Finished	1 7/16"	3/8"	3/16"	00000000	00000
				40	ANSI	1/2"	42	7"	Finished	1 1/2"	3/8"	3/16"	00000000	00000
				41	ANSI	1/2"	42	7"	Finished	3/4"	3/16"	3/32"	00000000	00000
				41	ANSI	1/2"	42	7"	Finished	1"	1/4"	1/8"	00000000	00000


				41	ANSI	1/2"	42	7"	Finished	1 1/4"	1/4"	1/8"	00000000	00000
				41	ANSI	1/2"	42	7"	Finished	1 1/2"	3/8"	3/16"	00000000	00000
				50	ANSI	5/8"	42	8 3/4"	Finished	3/4"	3/16"	3/32"	00000000	000000
				50	ANSI	5/8"	42	8 3/4"	Finished	7/8"	3/16"	3/32"	00000000	000000
				50	ANSI	5/8"	42	8 3/4"	Finished	1"	1/4"	1/8"	00000000	000000
				50	ANSI	5/8"	42	8 3/4"	Finished	1 1/8"	1/4"	1/8"	00000000	000000
				50	ANSI	5/8"	42	8 3/4"	Finished	1 3/16"	1/4"	1/8"	00000000	000000
				50	ANSI	5/8"	42	8 3/4"	Finished	1 1/4"	1/4"	1/8"	00000000	000000
				50	ANSI	5/8"	42	8 3/4"	Finished	1 3/8"	5/16"	5/32"	00000000	000000
				50	ANSI	5/8"	42	8 3/4"	Finished	1 7/16"	3/8"	3/16"	00000000	000000


				50	ANSI	5/8"	42	8 3/4"	Finished	1 1/2"	3/8"	3/16"	00000000	000000
				50	ANSI	5/8"	42	8 3/4"	Finished	1 5/8"	3/8"	3/16"	00000000	000000
				50	ANSI	5/8"	42	8 3/4"	Finished	1 3/4"	3/8"	3/16"	00000000	000000
				50	ANSI	5/8"	42	8 3/4"	Finished	1 15/16"	1/2"	1/4"	00000000	000000
				60	ANSI	3/4"	42	10 7/16"	Finished	1"	1/4"	1/8"	00000000	000000
				60	ANSI	3/4"	42	10 7/16"	Finished	1 1/8"	1/4"	1/8"	00000000	000000
				60	ANSI	3/4"	42	10 7/16"	Finished	1 3/16"	1/4"	1/8"	00000000	000000
				60	ANSI	3/4"	42	10 7/16"	Finished	1 1/4"	1/4"	1/8"	00000000	000000
				60	ANSI	3/4"	42	10 7/16"	Finished	1 3/8"	5/16"	5/32"	00000000	000000
				60	ANSI	3/4"	42	10 7/16"	Finished	1 7/16"	3/8"	3/16"	00000000	000000


				60	ANSI	3/4"	42	10 7/16"	Finished	1 1/2"	3/8"	3/16"	00000000	000000
				60	ANSI	3/4"	42	10 7/16"	Finished	1 5/8"	3/8"	3/16"	00000000	000000
				60	ANSI	3/4"	42	10 7/16"	Finished	1 3/4"	3/8"	3/16"	00000000	000000
				60	ANSI	3/4"	42	10 7/16"	Finished	1 15/16"	1/2"	1/4"	00000000	000000
				60	ANSI	3/4"	42	10 7/16"	Finished	2"	1/2"	1/4"	00000000	000000
				60	ANSI	3/4"	42	10 7/16"	Finished	2 3/16"	1/2"	1/4"	00000000	000000
				60	ANSI	3/4"	42	10 7/16"	Finished	2 7/16"	5/8"	5/16"	00000000	000000


				For Double Strand







	Steel

	08B-2						ISO	1/2"	42	177 mm	Plain	20 mm to 73 mm	—	—	0000000	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


14 1/2° Pressure Angle, Round Bore	14 1/2° Pressure Angle, Keyed Bore

14 1/2° Pressure Angle—A former industry standard, 14½° pressure angle gears are often found in older machinery.

Nylon—Nylon gears are wear resistant, but will swell and weaken over time when wet.

						Hub				Keyway
	Gear Pitch	No. of Teeth	Gear Pitch Dia.	OD	Face Wd.	Dia.	Wd.	Bore Type	For Shaft Dia.	Wd.	Dp.	Color		Each
14 1/2° Pressure Angle







				Nylon

				48	42	7/8"	0.91"	1/8"	0.438"	0.25"	Round Bore	1/4"	—	—	White	00000000	000000


				16	42	2 5/8"	2.75"	5/8"	1.375"	0.25"	Keyed Bore	13/32"	0.125"	0.063"	White	00000000	00000

Gear Racks

14 1/2° 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.

Nylon—Nylon gear racks are wear resistant, but will swell and weaken over time when wet.

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

	Ht.	Face Wd.	Fabrication	Color		Each
14 1/2° Pressure Angle—Rectangular







	Nylon

	48	1	0.109"	1/8"	1/8"	Molded	White	00000000	00000


	16	1	0.25"	5/16"	5/16"	Molded	White	00000000	00000
	16	4	0.438"	1/2"	1/2"	Machined	Green	00000000	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


20° Pressure Angle Round Bore	Gear with Round or Round/Machinable Bore	Gear with Keyed 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.

14 1/2° Pressure Angle—A former industry standard, 14½° pressure angle gears are often found in older machinery.

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

Stainless Steel—Stainless steel gears resist rust in damp and wet environments, so they're commonly used in food-processing plants and other areas with frequent cleaning.

Plain Bore—Gears with a plain bore have a large hub diameter so you can machine them to fit your shaft.

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







				Steel

				—	1.5	42	63 mm	66 mm	15 mm	45 mm	10 mm	Round Bore	12 mm	—	—	Not Hardened	Black-Oxide 1045 Carbon Steel	00000000	000000




						Stainless Steel

						—	1	42	42 mm	44 mm	10 mm	35 mm	10 mm	Round Bore	10 mm	—	—	Not Hardened	303 Stainless Steel	00000000	00000


						14 1/2° Pressure Angle







										Steel

										12	—	42	3 1/2"	3.67"	3/4"	2.5"	0.625"	Round/Plain Bore	5/8" to 1 1/2"	—	—	Not Hardened	1144 Carbon Steel	000000	00000


										12	—	42	3 1/2"	3.67"	3/4"	2.5"	0.625"	Keyed Bore with Set Screw	5/8"	0.188"	0.094"	Not Hardened	1144 Carbon Steel	0000000	000000

Gear Racks


20° Pressure Angle—Rectangular	20° Pressure Angle—Round

14 1/2° 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.

Stainless Steel—Stainless steel gear racks resist rust in damp and wet environments, so they're commonly used in food-processing plants and other areas with frequent cleaning.

Hardened—Gear racks with hardened teeth have better wear resistance than racks with teeth that are not hardened.

	Pitch Ht.	Ht.	Face Wd.	Dia., mm	Tooth Heat Treatment	Material	Features	No. of Mounting Holes		Each
20° Pressure Angle—Rectangular







	Steel

	—	1.5	100 mm	18.5 mm	20 mm	15 mm	—	Not Hardened	Black-Oxide 1045 Carbon Steel	—	—	00000000	000000


	—	1.5	300 mm	18.5 mm	20 mm	15 mm	—	Not Hardened	Black-Oxide 1045 Carbon Steel	—	—	00000000	00000
	—	1.5	500 mm	13.3 mm	14.8 mm	15 mm	—	Not Hardened	1045 Carbon Steel	—	—	00000000	000000
	—	1.5	1,000 mm	13.3 mm	14.8 mm	15 mm	—	Not Hardened	1045 Carbon Steel	—	—	00000000	000000
	—	1.5	1,000 mm	13.5 mm	15 mm	15 mm	—	Not Hardened	Black-Oxide 1045 Carbon Steel	Machined Ends	—	00000000	000000




			Stainless Steel

			—	1	500 mm	11 mm	12 mm	10 mm	—	Hardened	304 Stainless Steel	—	—	00000000	000000


			20° Pressure Angle—Round







							Steel

							—	1.5	500 mm	13.5 mm	—	—	15	Not Hardened	Black-Oxide 1045 Carbon Steel	—	—	00000000	000000


							14 1/2° Pressure Angle—Rectangular







											Steel

											12	—	2 ft.	0.417"	1/2"	3/4"	—	Not Hardened	1018 Low-Carbon Steel	—	—	0000000	00000


											12	—	2 ft.	0.667"	3/4"	3/4"	—	Not Hardened	1018 Low-Carbon Steel	—	—	0000000	00000
											12	—	4 ft.	0.417"	1/2"	3/4"	—	Not Hardened	1018 Low-Carbon Steel	—	—	00000000	00000
											12	—	4 ft.	0.667"	3/4"	3/4"	—	Not Hardened	1018 Low-Carbon Steel	—	12	000000	000000
											12	—	4 ft.	0.667"	3/4"	3/4"	—	Not Hardened	1215 Carbon Steel	—	—	00000000	00000
											12	—	6 ft.	0.417"	1/2"	3/4"	—	Not Hardened	1018 Low-Carbon Steel	—	—	00000000	00000
											12	—	6 ft.	0.667"	3/4"	3/4"	—	Not Hardened	1215 Carbon Steel	—	—	00000000	000000

Internal Gears

Image of Product. Front orientation. Internal Spur Gears. Metal Spur Gears.

Save space without losing power. Insert a standard spur gear inside one of these gears for a compact assembly that smoothly transmits 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.

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

	OD, mm	ID, mm	Face Wd., mm	Tooth Heat Treatment	Finished Material		Each
20° Pressure Angle







	Steel

	1.5	100	150	190	147	15	Not Hardened	Black-Oxide 1045 Carbon Steel	0000000	0000000

Timing Belt Pulleys

Finished Bore

Keep your drive system in sync. Trapezoidal teeth mesh with matching belts to synchronize motion. With the original tooth profile, these pulleys handle enough torque for most applications. If you need high torque or precise starts and stops, consider curved tooth profiles, such as GT and HTD pulleys.

Steel—Strong but best for dry environments since moisture will cause them to rust.

Corrosion-Resistant Aluminum—Won't rust in wet environments and one-third the weight of steel and iron. However, aluminum pulleys are not as strong as iron and steel.

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

	Bore Type	For Shaft Dia.	Pitch Dia.	No. of Flanges	Hub Type		Each
For MXL Trade Size







	Corrosion-Resistant Aluminum

	1/8"	0.080"	42	Finished	1/4"	1.07"	2	Standard	0000000	000000


	1/4"	0.080"	42	Finished	1/4"	1.07"	2	Standard	0000000	00000
	3 mm	0.080"	42	Finished	6 mm	27.2 mm	2	Standard	00000000	00000
	6 mm	0.080"	42	Finished	6 mm	27.2 mm	2	Standard	00000000	00000


	For XL Trade Size







					Steel

					3/8"	0.200"	42	Finished	5/16"	2.674"	—	Standard	00000000	00000




							Corrosion-Resistant Aluminum

							3/8"	0.200"	42	Finished	5/16"	2.674"	—	Standard	0000000	00000

Plastic Timing Belt Pulleys

Naturally rust resistant and lightweight, these plastic pulleys are ideal for machines that require frequent washdowns. Trapezoidal teeth, the original tooth profile, mesh with matching belts to transmit power without slipping.

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

Plain Bore—Do it your way—machine the bore to your exact shaft size or add a set screw or keyway.

	Bore Type	For Shaft Dia.	Pitch Dia.	No. of Flanges	Hub Type		Each
For MXL Trade Size







	Polycarbonate

	1/4"	0.080"	42	Plain	1/4"	1.07"	2	Standard	0000000	00000


	For XL Trade Size







					Acetal

					3/8"	0.200"	42	Finished	5/16"	2.674"	2	Standard	00000000	00000


					3/8"	0.200"	42	Finished	10 mm	2.67"	2	Standard	0000000	00000