Idler Sprockets

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Roller Chain Trade Number

Number of Teeth

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Overall Width

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Export Control Classification Number (ECCN)

Sprocket Type

REACH

RoHS

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Teeth Heat Treatment

Performance

85 Products

Bearing Type

Ball

Roll nearly friction-free to handle high speeds

60 products

Roller

Rotate smoothly under your heaviest loads

12 products

Plain Bearing Type

Sleeve

No moving parts for low-speed jobs in dirty environments

13 products

Performance

Wear Resistant

Hardened teeth for a long service life

38 products

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—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.

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
Ball Bearing







				Steel

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


				35	ANSI	3/8"	19	3/8"	2.47"	Steel	0000000	00000
				35	ANSI	3/8"	19	1/2"	2.47"	Steel	0000000	00000
				40	ANSI	1/2"	18	1/2"	3.14"	Steel	0000000	00000
				40	ANSI	1/2"	18	5/8"	3.14"	Steel	0000000	00000
				41	ANSI	1/2"	18	1/2"	3.14"	Steel	0000000	00000
				41	ANSI	1/2"	18	5/8"	3.14"	Steel	0000000	00000
				50	ANSI	5/8"	17	1/2"	3.72"	Steel	0000000	00000
				50	ANSI	5/8"	17	5/8"	3.72"	Steel	0000000	00000
				60	ANSI	3/4"	15	1/2"	3.98"	Steel	0000000	00000
				60	ANSI	3/4"	15	5/8"	3.98"	Steel	0000000	00000


				80	ANSI	1"	12	3/4"	4.33"	Steel	0000000	00000
				100	ANSI	1 1/4"	11	3/4"	5.01"	Steel	00000000	000000
				120	ANSI	1 1/2"	10	1"	5.52"	Steel	00000000	000000
				05B	ISO	8 mm	23	16 mm	62 mm	Steel	0000000	00000
				06B	ISO	3/8"	21	16 mm	68 mm	Steel	0000000	00000
				08B	ISO	1/2"	16	16 mm	69.5 mm	Steel	0000000	00000
				08B	ISO	1/2"	18	16 mm	78 mm	Steel	0000000	00000
				10B	ISO	5/8"	15	16 mm	93 mm	Steel	0000000	00000
				10B	ISO	5/8"	17	16 mm	93 mm	Steel	0000000	00000
				12B	ISO	3/4"	15	16 mm	100 mm	Steel	0000000	00000


				16B	ISO	1"	12	20 mm	109 mm	Steel	000000	00000




						Wear-Resistant Steel with Hardened Teeth

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


						35	ANSI	3/8"	19	3/8"	2.47"	Steel	00000000	00000
						35	ANSI	3/8"	19	1/2"	2.47"	Steel	000000	00000
						35	ANSI	3/8"	20	5/8"	2.59"	Steel	0000000	00000
						40	ANSI	1/2"	17	5/8"	2.98"	Steel	0000000	00000
						40	ANSI	1/2"	18	1/2"	3.14"	Steel	00000000	00000
						40	ANSI	1/2"	18	5/8"	3.14"	Steel	00000000	00000
						40	ANSI	1/2"	25	5/8"	4.26"	Steel	00000000	00000
						40	ANSI	1/2"	35	5/8"	5.86"	Steel	00000000	00000
						40	ANSI	1/2"	48	5/8"	7.93"	Steel	00000000	00000
						41	ANSI	1/2"	18	1/2"	3.14"	Steel	000000	00000


						41	ANSI	1/2"	18	5/8"	3.14"	Steel	000000	00000
						50	ANSI	5/8"	15	5/8"	3.32"	Steel	0000000	00000
						50	ANSI	5/8"	17	1/2"	3.72"	Steel	00000000	00000
						50	ANSI	5/8"	17	5/8"	3.72"	Steel	00000000	00000
						50	ANSI	5/8"	25	3/4"	5.32"	Steel	00000000	00000
						50	ANSI	5/8"	39	3/4"	8.12"	Steel	00000000	000000
60						ANSI	3/4"	12	5/8"	3.25"	Steel	00000000	00000
60	ANSI					3/4"	13	5/8"	3.49"	Steel	0000000	00000
60	ANSI					3/4"	15	5/8"	3.98"	Steel	00000000	00000
60	ANSI					3/4"	17	5/8"	4.46"	Steel	00000000	000000


80	ANSI	1"	12			3/4"	4.33"	Steel	000000	000000


Sleeve Bearing







						Steel

						35	ANSI	3/8"	15	1/2"	1.99"	Bronze	0000000	00000


						35	ANSI	3/8"	21	7/8"	2.71"	Bronze	0000000	00000
						40	ANSI	1/2"	13	1/2"	2.33"	Bronze	0000000	00000
						40	ANSI	1/2"	19	7/8"	3.29"	Bronze	0000000	00000
						50	ANSI	5/8"	13	1/2"	2.91"	Bronze	0000000	00000
						50	ANSI	5/8"	17	7/8"	3.72"	Bronze	0000000	00000
						60	ANSI	3/4"	15	7/8"	3.98"	Bronze	0000000	000000
						60	ANSI	3/4"	17	1 1/8"	4.46"	Bronze	0000000	000000
						80	ANSI	1"	15	1 1/8"	5.3"	Bronze	0000000	000000




								Wear-Resistant Steel with Hardened Teeth

								35	ANSI	3/8"	20	1/2"	2.59"	Bronze	0000000	00000


								40, 41	ANSI	1/2"	15	1/2"	2.65"	Bronze	0000000	00000
				50				ANSI	5/8"	15	1/2"	3.32"	Bronze	0000000	00000
				60	ANSI			3/4"	14	1/2"	3.74"	Bronze	0000000	00000


				Needle-Roller Bearing







										Wear-Resistant Steel with Hardened Teeth

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


										35	ANSI	3/8"	13	1/2"	1.75"	Bronze	0000000	000000
										35	ANSI	3/8"	19	1"	2.47"	Bronze	0000000	000000
										40	ANSI	1/2"	19	1"	3.29"	Bronze	0000000	000000
										41	ANSI	1/2"	19	1"	3.29"	Bronze	0000000	000000
										50	ANSI	5/8"	17	1"	3.72"	Bronze	0000000	000000
										60	ANSI	3/4"	17	1"	4.46"	Bronze	0000000	000000
										80	ANSI	1"	13	1"	4.66"	Bronze	0000000	000000
										100	ANSI	1 1/4"	11	1 1/2"	5.01"	Bronze	00000000	000000
										120	ANSI	1 1/2"	11	1 1/2"	6.01"	Bronze	00000000	000000
										140	ANSI	1 3/4"	11	1 1/2"	7.01"	Bronze	00000000	000000


										160	ANSI	2"	9	1 1/2"	6.7"	Bronze	00000000	000000

For Double Strand

Ball 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.

Steel—Steel is strong, but 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

				35-2	ANSI	3/8"	19	1/2"	2.47"	Steel	000000	0000000


				35-2	ANSI	3/8"	19	5/8"	2.47"	Steel	000000	000000
				40-2	ANSI	1/2"	18	1/2"	3.14"	Steel	000000	000000
				40-2	ANSI	1/2"	18	5/8"	3.14"	Steel	000000	000000
				50-2	ANSI	5/8"	17	1/2"	3.72"	Steel	000000	000000
				50-2	ANSI	5/8"	17	5/8"	3.72"	Steel	000000	000000
				60-2	ANSI	3/4"	15	1/2"	3.98"	Steel	000000	000000
				60-2	ANSI	3/4"	15	5/8"	3.98"	Steel	000000	000000
				80-2	ANSI	1"	12	3/4"	4.33"	Steel	000000	000000

Plastic Idler 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. All of these sprockets maintain constant tension on your roller chain to reduce wear and vibration. They 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—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.

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



		40	ANSI	1/2"	17	5/8"	3"	Steel	0000000	000000


		40	ANSI	1/2"	17	3/4"	3"	Steel	0000000	00000
		50	ANSI	5/8"	15	5/8"	3.34"	Steel	0000000	00000
		50	ANSI	5/8"	15	3/4"	3.34"	Steel	0000000	00000
		60	ANSI	3/4"	13	5/8"	3.5"	Steel	0000000	00000
		60	ANSI	3/4"	13	3/4"	3.5"	Steel	0000000	00000
		80	ANSI	1"	12	5/8"	4.4"	Steel	0000000	00000