Bronze Sprockets | McMaster-Carr

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Roller Chain Trade Number

Number of Teeth

System of Measurement

Shaft Diameter

Pitch

Bearing Type

Material

Bore Type

Shaft Type

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Shaft Mount Type

Bearing Material

Hub Diameter

Width

Overall Width

Chain Standard

Chain Type

Component

Export Control Classification Number (ECCN)

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Idler

DFARS Specialty Metals

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50 Products

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

Sleeve Bearing—With no moving parts, sleeve bearings are best for dirty environments. They generate more friction than ball bearings, making them less suitable for high-speed applications. Made of porous bronze embedded with oil, all are self-lubricating.

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
Sleeve Bearing







				Steel

				35	ANSI	3/8"	15	1/2"	2"	Bronze	0000000	000000


				35	ANSI	3/8"	21	7/8"	2 11/16"	Bronze	0000000	00000
				40	ANSI	1/2"	13	1/2"	2 5/16"	Bronze	0000000	00000
				40	ANSI	1/2"	19	7/8"	3 5/16"	Bronze	0000000	00000
				50	ANSI	5/8"	13	1/2"	2 15/16"	Bronze	0000000	00000
				50	ANSI	5/8"	17	7/8"	3 3/4"	Bronze	0000000	00000
				60	ANSI	3/4"	15	7/8"	4"	Bronze	0000000	00000
				60	ANSI	3/4"	17	1 1/8"	4 7/16"	Bronze	0000000	000000
				80	ANSI	1"	15	1 1/8"	5 5/16"	Bronze	0000000	000000




						Wear-Resistant Steel with Hardened Teeth

						35	ANSI	3/8"	20	1/2"	2 9/16"	Bronze	0000000	00000


						40, 41	ANSI	1/2"	15	1/2"	2 5/8"	Bronze	0000000	00000
						50	ANSI	5/8"	15	1/2"	3 5/16"	Bronze	0000000	00000
						60	ANSI	3/4"	14	1/2"	3 3/4"	Bronze	0000000	00000


						Needle-Roller Bearing







										Wear-Resistant Steel with Hardened Teeth

										25	ANSI	1/4"	19	1/2"	1 5/8"	Bronze	0000000	00000


										35	ANSI	3/8"	13	1/2"	1 3/4"	Bronze	0000000	00000
										35	ANSI	3/8"	19	1"	2 1/2"	Bronze	0000000	00000
										40	ANSI	1/2"	19	1"	3 5/16"	Bronze	0000000	00000
										41	ANSI	1/2"	19	1"	3 5/16"	Bronze	0000000	00000
										50	ANSI	5/8"	17	1"	3 3/4"	Bronze	0000000	000000
										60	ANSI	3/4"	17	1"	4 7/16"	Bronze	0000000	000000
										80	ANSI	1"	13	1"	4 11/16"	Bronze	0000000	000000
										100	ANSI	1 1/4"	11	1 1/2"	5"	Bronze	00000000	000000
										120	ANSI	1 1/2"	11	1 1/2"	6"	Bronze	00000000	000000
										140	ANSI	1 3/4"	11	1 1/2"	7"	Bronze	00000000	000000


										160	ANSI	2"	9	1 1/2"	6 11/16"	Bronze	00000000	000000

Metal Worms and Worm Gears

Worm and

Gear Sold

Separately

Worm gears use screw threads to make large reductions to shaft speed while transmitting motion at a right angle. They transmit motion from worm to gear and cannot be reversed. For gears and worms to mesh correctly, they must have the same pressure angle, pitch/module, number of thread starts, and thread direction. These worms are compatible with plastic worm gears.

Gears

Bronze—Bronze gears have low friction and dissipate heat better than cast iron gears to provide a long service life for both the gear and the worm. They’re also more corrosion resistant than cast iron gears.

Speed Ratio—Speed ratio is the ratio by which output shaft speed is reduced. As speed decreases, torque increases.

												Hub
	Gear Module	Gear Pitch	Speed Ratio	No. of Teeth	Pressure Angle	Gear Pitch Dia.	For No. of Thread Starts	OD	Face Wd.	Overall Wd.	For Shaft Dia.	Dia.	Wd.	Material	For Thread Direction	Tooth Heat Treatment	Tooth Mechanical Finish		Each
Round Bore—Bronze



		—	12	20:1	20	14 1/2°	1.67"	1	1.87"	1/2"	1"	1/2"	1.25"	0.5"	Bronze	Right Hand	Not Hardened	Unfinished	000000000	0000000


		—	12	30:1	30	14 1/2°	2 1/2"	1	2.7"	1/2"	1.12"	1/2"	1.19"	0.62"	Bronze	Right Hand	Not Hardened	Unfinished	000000000	000000
		—	12	40:1	40	14 1/2°	3.33"	1	3.54"	1/2"	1.12"	5/8"	1.44"	0.62"	Bronze	Right Hand	Not Hardened	Unfinished	000000000	000000
		—	10	20:1	20	14 1/2°	2"	1	2.24"	5/8"	1.245"	1/2"	1.25"	0.62"	Bronze	Right Hand	Not Hardened	Unfinished	000000000	000000
		—	10	30:1	30	14 1/2°	3"	1	3.24"	5/8"	1.245"	5/8"	1.69"	0.62"	Bronze	Right Hand	Not Hardened	Unfinished	000000000	000000
		—	10	40:1	40	14 1/2°	4"	1	4.24"	5/8"	1.245"	5/8"	1.69"	0.62"	Bronze	Right Hand	Not Hardened	Unfinished	000000000	000000
		—	10	50:1	50	14 1/2°	5"	1	5.24"	5/8"	1.375"	3/4"	1.94"	0.75"	Bronze	Right Hand	Not Hardened	Unfinished	000000000	000000
		0.5	—	10:1	20	20°	10 mm	2	11 mm	5 mm	12 mm	4 mm	9 mm	7 mm	Bronze	Right Hand	Not Hardened	Unfinished	000000000	00000
		0.5	—	15:1	30	20°	15 mm	2	16 mm	5 mm	12 mm	4 mm	12 mm	7 mm	Bronze	Right Hand	Not Hardened	Unfinished	000000000	00000
		0.5	—	20:1	20	20°	10 mm	1	11 mm	5 mm	12 mm	4 mm	9 mm	7 mm	Bronze	Right Hand	Not Hardened	Unfinished	000000000	00000
		0.5	—	30:1	30	20°	15 mm	1	16 mm	5 mm	12 mm	4 mm	12 mm	7 mm	Bronze	Right Hand	Not Hardened	Unfinished	000000000	00000


		0.5	—	40:1	40	20°	20 mm	1	21 mm	5 mm	12 mm	5 mm	15 mm	7 mm	Bronze	Right Hand	Not Hardened	Unfinished	000000000	00000
		0.5	—	50:1	50	20°	25 mm	1	26 mm	5 mm	12 mm	5 mm	20 mm	7 mm	Bronze	Right Hand	Not Hardened	Unfinished	000000000	00000
		0.5	—	60:1	60	20°	30 mm	1	31 mm	5 mm	12 mm	5 mm	25 mm	7 mm	Bronze	Right Hand	Not Hardened	Unfinished	000000000	00000
		0.8	—	10:1	20	20°	16 mm	2	17.6 mm	9 mm	18 mm	5 mm	12 mm	9 mm	Bronze	Right Hand	Not Hardened	Unfinished	000000000	00000
		0.8	—	20:1	20	20°	16 mm	1	17.6 mm	9 mm	18 mm	5 mm	12 mm	9 mm	Bronze	Right Hand	Not Hardened	Unfinished	000000000	00000
		0.8	—	30:1	30	20°	24 mm	1	25.6 mm	9 mm	18 mm	5 mm	18 mm	9 mm	Bronze	Right Hand	Not Hardened	Unfinished	000000000	00000
		0.8	—	40:1	40	20°	32 mm	1	33.6 mm	9 mm	18 mm	6 mm	20 mm	9 mm	Bronze	Right Hand	Not Hardened	Unfinished	000000000	00000
		1	—	10:1	20	20°	20 mm	2	23 mm	10 mm	20 mm	6 mm	16 mm	10 mm	Bronze	Right Hand	Not Hardened	Unfinished	000000000	00000
		1	—	30:1	30	20°	30 mm	1	33 mm	10 mm	20 mm	6 mm	20 mm	10 mm	Bronze	Right Hand	Not Hardened	Unfinished	000000000	00000
		1.25	—	20:1	20	20°	25 mm	1	28.75 mm	10 mm	20 mm	6 mm	20 mm	10 mm	Bronze	Right Hand	Not Hardened	Unfinished	000000000	00000


		1.5	—	10:1	20	20°	30 mm	2	34.5 mm	12 mm	22 mm	8 mm	22 mm	10 mm	Bronze	Right Hand	Not Hardened	Unfinished	000000000	00000
		1.5	—	15:1	30	20°	45 mm	2	49.5 mm	12 mm	22 mm	10 mm	30 mm	10 mm	Bronze	Right Hand	Not Hardened	Unfinished	000000000	00000
		1.5	—	20:1	20	20°	30 mm	1	34.5 mm	12 mm	22 mm	8 mm	22 mm	10 mm	Bronze	Right Hand	Not Hardened	Unfinished	000000000	00000
		1.5	—	30:1	30	20°	45 mm	1	49.5 mm	12 mm	22 mm	10 mm	30 mm	10 mm	Bronze	Right Hand	Not Hardened	Unfinished	000000000	00000