Bronze Sprockets | McMaster-Carr

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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	6663K81	000000


				35	ANSI	3/8"	21	7/8"	2 11/16"	Bronze	6663K82	00000
				40	ANSI	1/2"	13	1/2"	2 5/16"	Bronze	6663K85	00000
				40	ANSI	1/2"	19	7/8"	3 5/16"	Bronze	6663K86	00000
				50	ANSI	5/8"	13	1/2"	2 15/16"	Bronze	6663K87	00000
				50	ANSI	5/8"	17	7/8"	3 3/4"	Bronze	6663K88	00000
				60	ANSI	3/4"	15	7/8"	4"	Bronze	6663K89	00000
				60	ANSI	3/4"	17	1 1/8"	4 7/16"	Bronze	6663K91	000000
				80	ANSI	1"	15	1 1/8"	5 5/16"	Bronze	6663K92	000000




						Wear-Resistant Steel with Hardened Teeth

						35	ANSI	3/8"	20	1/2"	2 9/16"	Bronze	6663K12	00000


						40, 41	ANSI	1/2"	15	1/2"	2 5/8"	Bronze	6663K13	00000
						50	ANSI	5/8"	15	1/2"	3 5/16"	Bronze	6663K14	00000
						60	ANSI	3/4"	14	1/2"	3 3/4"	Bronze	6663K15	00000


						Needle-Roller Bearing







										Wear-Resistant Steel with Hardened Teeth

										25	ANSI	1/4"	19	1/2"	1 5/8"	Bronze	6663K71	00000


										35	ANSI	3/8"	13	1/2"	1 3/4"	Bronze	6663K72	00000
										35	ANSI	3/8"	19	1"	2 1/2"	Bronze	6663K73	00000
										40	ANSI	1/2"	19	1"	3 5/16"	Bronze	6663K75	00000
										41	ANSI	1/2"	19	1"	3 5/16"	Bronze	6663K74	00000
										50	ANSI	5/8"	17	1"	3 3/4"	Bronze	6663K76	000000
										60	ANSI	3/4"	17	1"	4 7/16"	Bronze	6663K77	000000
										80	ANSI	1"	13	1"	4 11/16"	Bronze	6663K78	000000
										100	ANSI	1 1/4"	11	1 1/2"	5"	Bronze	6663K207	000000
										120	ANSI	1 1/2"	11	1 1/2"	6"	Bronze	6663K208	000000
										140	ANSI	1 3/4"	11	1 1/2"	7"	Bronze	6663K209	000000


										160	ANSI	2"	9	1 1/2"	6 11/16"	Bronze	6663K211	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	57545K231	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	57545K232	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	57545K233	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	57545K234	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	57545K235	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	57545K236	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	57545K237	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	57545K735	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	57545K737	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	57545K734	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	57545K736	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	57545K738	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	57545K739	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	57545K741	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	57545K743	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	57545K742	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	57545K744	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	57545K746	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	57545K764	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	57545K765	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	57545K749	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	57545K757	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	57545K759	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	57545K756	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	57545K758	00000