Tensioner Sprockets | McMaster-Carr

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113 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

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 3/4"	Steel	6663K11	000000


				35	ANSI	3/8"	19	3/8"	2 1/2"	Steel	6663K21	00000
				35	ANSI	3/8"	19	1/2"	2 1/2"	Steel	6663K22	00000
				40	ANSI	1/2"	18	1/2"	3 1/8"	Steel	6663K41	00000
				40	ANSI	1/2"	18	5/8"	3 1/8"	Steel	6663K42	00000
				41	ANSI	1/2"	18	1/2"	3 1/8"	Steel	6663K31	00000
				41	ANSI	1/2"	18	5/8"	3 1/8"	Steel	6663K32	00000
				50	ANSI	5/8"	17	1/2"	3 3/4"	Steel	6663K51	00000
				50	ANSI	5/8"	17	5/8"	3 3/4"	Steel	6663K52	00000
				60	ANSI	3/4"	15	1/2"	4"	Steel	6663K61	00000
				60	ANSI	3/4"	15	5/8"	4"	Steel	6663K62	00000


				80	ANSI	1"	12	3/4"	4 5/16"	Steel	6663K63	00000
				100	ANSI	1 1/4"	11	3/4"	5"	Steel	6663K291	000000
				120	ANSI	1 1/2"	10	1"	5 1/2"	Steel	6663K292	000000
				05B	ISO	8 mm	23	16 mm	62 mm	Steel	4182N11	00000
				06B	ISO	3/8"	21	16 mm	68 mm	Steel	4182N12	00000
				08B	ISO	1/2"	16	16 mm	70 mm	Steel	4182N15	00000
				08B	ISO	1/2"	18	16 mm	78 mm	Steel	4182N16	00000
				10B	ISO	5/8"	15	16 mm	93 mm	Steel	4182N17	00000
				10B	ISO	5/8"	17	16 mm	93 mm	Steel	4182N18	00000
				12B	ISO	3/4"	15	16 mm	100 mm	Steel	4182N19	00000


				16B	ISO	1"	12	20 mm	109 mm	Steel	4182N2	00000




						Wear-Resistant Steel with Hardened Teeth

						25	ANSI	1/4"	20	3/8"	1 3/4"	Steel	6663K191	00000


						35	ANSI	3/8"	19	3/8"	2 1/2"	Steel	6663K192	00000
						35	ANSI	3/8"	19	1/2"	2 1/2"	Steel	6663K1	00000
						35	ANSI	3/8"	20	5/8"	2 9/16"	Steel	6663K23	00000
						40	ANSI	1/2"	17	5/8"	3"	Steel	6663K43	00000
						40	ANSI	1/2"	18	1/2"	3 1/8"	Steel	6663K193	00000
						40	ANSI	1/2"	18	5/8"	3 1/8"	Steel	6663K194	00000
						40	ANSI	1/2"	25	5/8"	4 1/4"	Steel	6663K201	00000
						40	ANSI	1/2"	35	5/8"	5 7/8"	Steel	6663K202	00000
						40	ANSI	1/2"	48	5/8"	7 15/16"	Steel	6663K203	00000
						41	ANSI	1/2"	18	1/2"	3 1/8"	Steel	6663K2	00000


						41	ANSI	1/2"	18	5/8"	3 1/8"	Steel	6663K3	00000
						50	ANSI	5/8"	15	5/8"	3 5/16"	Steel	6663K44	00000
						50	ANSI	5/8"	17	1/2"	3 3/4"	Steel	6663K195	00000
						50	ANSI	5/8"	17	5/8"	3 3/4"	Steel	6663K196	00000
						50	ANSI	5/8"	25	3/4"	5 5/16"	Steel	6663K204	00000
						50	ANSI	5/8"	39	3/4"	8 1/8"	Steel	6663K205	000000
60						ANSI	3/4"	12	5/8"	3 1/4"	Steel	6663K206	00000
60	ANSI					3/4"	13	5/8"	3 1/2"	Steel	6663K53	00000
60	ANSI					3/4"	15	5/8"	4"	Steel	6663K197	00000
60	ANSI					3/4"	17	5/8"	4 7/16"	Steel	6663K198	000000


80	ANSI	1"	12			3/4"	4 5/16"	Steel	6663K4	00000


Sleeve Bearing







						Steel

						35	ANSI	3/8"	15	1/2"	2"	Bronze	6663K81	00000


						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

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 1/2"	Steel	6260K1	000000


				35-2	ANSI	3/8"	19	5/8"	2 1/2"	Steel	6260K2	00000
				40-2	ANSI	1/2"	18	1/2"	3 1/8"	Steel	6260K3	000000
				40-2	ANSI	1/2"	18	5/8"	3 1/8"	Steel	6260K4	000000
				50-2	ANSI	5/8"	17	1/2"	3 3/4"	Steel	6260K5	000000
				50-2	ANSI	5/8"	17	5/8"	3 3/4"	Steel	6260K6	000000
				60-2	ANSI	3/4"	15	1/2"	4"	Steel	6260K7	000000
				60-2	ANSI	3/4"	15	5/8"	4"	Steel	6260K8	000000
				80-2	ANSI	1"	12	3/4"	4 5/16"	Steel	6260K9	000000

Thread-Mount Idler Rotary Shafts


Tensioner Shown with Idler Shaft (Sold Separately)	Shaft Collar End	Retaining-Ring-Grooves End

Shaft Collar End

Retaining-Ring-Grooves End

Thread these shafts into a tapped hole to support idler sprockets and pulleys in tensioning applications.

Shaft Collar End—Shafts with a shaft collar come with a grease fitting for easy lubrication of your pulleys and sprockets. Adjust the collar to the width of your component.

Retaining-Ring-Grooves End—Shafts with retaining ring grooves come with a retaining ring and spacers to position your component and hold it in place.

			Overall		Thread		Groove
	Dia.	Lg.	Lg.	Dia.	Size	Lg.	Wd.	Dia.	End-to-Groove Lg.	Edge Type	Fabrication	Hardness Rating	Hardness		Each
Shaft Collar End—1215 Carbon Steel



		1/2"	1 1/16"	2 9/32"	1"	3/8"-16	7/16"	—	—	—	Chamfered	Hardened	Extra Hard	Rockwell C58	2435K101	000000


		5/8"	1 1/4"	3 3/8"	1 1/8"	1/2"-20	7/8"	—	—	—	Chamfered	Hardened	Extra Hard	Rockwell C58	2435K102	00000
		3/4"	2 7/16"	4 3/8"	1 1/4"	1/2"-20	7/8"	—	—	—	Chamfered	Hardened	Extra Hard	Rockwell C58	2435K103	00000
		1"	1 1/2"	3 3/8"	1 1/2"	3/4"-16	7/8"	—	—	—	Chamfered	Hardened	Extra Hard	Rockwell C58	1816K3	00000
		1"	2 1/2"	4 3/8"	1 1/2"	3/4"-16	7/8"	—	—	—	Chamfered	Hardened	Extra Hard	Rockwell C58	1816K4	00000
		1"	3 1/2"	5 3/8"	1 1/2"	3/4"-16	7/8"	—	—	—	Chamfered	Hardened	Extra Hard	Rockwell C58	1816K5	00000
		1 1/2"	3 1/4"	5 11/16"	2 1/4"	1"-14	1 5/16"	—	—	—	Chamfered	Hardened	Extra Hard	Rockwell C58	2435K104	00000
		1 1/2"	5 1/4"	7 11/16"	2 1/4"	1"-14	1 5/16"	—	—	—	Chamfered	Hardened	Extra Hard	Rockwell C58	2435K105	00000


		Retaining-Ring-Grooves End—Zinc-Plated 1215 Carbon Steel



				1/4"	3/8"	1 1/16"	1/2"	1/4"-20	21/64"	0.029"	0.21"	0.063"	Chamfered	—	Not Rated	Not Rated	2435K1	0000


				3/8"	7/16"	1 7/32"	3/4"	1/4"-20	11/32"	0.039"	0.303"	0.125"	Chamfered	—	Not Rated	Not Rated	2435K2	00000
				1/2"	5/8"	1 9/16"	1"	5/16"-18	1/2"	0.046"	0.396"	0.125"	Chamfered	—	Not Rated	Not Rated	2435K3	00000
				5/8"	5/8"	1 19/32"	1 1/8"	5/16"-18	17/32"	0.046"	0.485"	0.125"	Chamfered	—	Not Rated	Not Rated	2435K4	00000
				3/4"	5/8"	1 25/32"	1 1/4"	3/8"-16	45/64"	0.056"	0.58"	0.125"	Chamfered	—	Not Rated	Not Rated	2435K5	00000
				1"	5/8"	2"	1 1/2"	1/2"-13	15/16"	0.056"	0.835"	0.125"	Chamfered	—	Not Rated	Not Rated	2435K6	00000
				8 mm	9 mm	28 mm	15 mm	M6 × 1 mm	8 mm	0.733 mm	6.35 mm	2.56 mm	Chamfered	—	Medium	Rockwell B84	2435K35	0000
				10 mm	11 mm	34 mm	19 mm	M8 × 1.25 mm	10.66 mm	0.99 mm	7.69 mm	3.12 mm	Chamfered	—	Medium	Rockwell B84	2435K36	00000
				12 mm	12 mm	35 mm	22 mm	M8 × 1.25 mm	10.66 mm	0.99 mm	8.71 mm	3.12 mm	Chamfered	—	Medium	Rockwell B84	2435K37	00000
				20 mm	15 mm	45 mm	31 mm	M12 × 1.75 mm	16 mm	1.422 mm	14.73 mm	4.06 mm	Chamfered	—	Medium	Rockwell B84	2435K38	00000

Flange-Mount Idler Rotary Shafts

Mount the flange to a machine or wall to support idler sprockets and pulleys in tensioning applications. They include washers and a nut to position your component and hold it in place.

			Overall		Thread				Mounting Holes
	Dia.	Lg.	Lg.	Dia.	Size	Lg.	Flange Thk.	Bolt Circle Dia.	No. of	Dia.	Edge Type	Hardness Rating	Hardness		Each
Threaded End—Zinc-Plated 1215 Carbon Steel



		1/4"	3/8"	1"	1 1/16"	10-24	11/32"	9/32"	23/32"	4	5/32"	Straight	Not Rated	Not Rated	2435K11	000000


		3/8"	7/16"	1 3/16"	1 1/4"	5/16"-18	15/32"	9/32"	29/32"	4	5/32"	Straight	Not Rated	Not Rated	2435K12	00000
		1/2"	5/8"	1 1/2"	1 7/16"	7/16"-14	19/32"	9/32"	1 3/32"	4	5/32"	Straight	Not Rated	Not Rated	2435K13	00000
		5/8"	5/8"	1 21/32"	1 5/8"	1/2"-13	23/32"	5/16"	1 1/4"	4	5/32"	Straight	Not Rated	Not Rated	2435K14	00000
		3/4"	5/8"	1 27/32"	1 7/8"	5/8"-11	7/8"	11/32"	1 7/16"	4	3/16"	Straight	Not Rated	Not Rated	2435K15	00000
		1"	5/8"	2 1/8"	2 1/4"	7/8"-9	1 3/32"	13/32"	1 3/4"	4	1/4"	Straight	Not Rated	Not Rated	2435K16	00000
		8 mm	9 mm	24 mm	28 mm	M6 × 1 mm	6.6 mm	7 mm	20 mm	4	3 mm	Straight	Medium	Rockwell B84	2435K31	00000
		10 mm	11 mm	28 mm	30 mm	M8 × 1.25 mm	8.26 mm	7 mm	22 mm	4	3 mm	Straight	Medium	Rockwell B84	2435K32	00000
		12 mm	12 mm	33 mm	36 mm	M10 × 1.5 mm	9.9 mm	9 mm	26 mm	4	4 mm	Straight	Medium	Rockwell B84	2435K33	00000
		20 mm	15 mm	46 mm	50 mm	M18 × 2.5 mm	16.56 mm	11 mm	36 mm	4	6 mm	Straight	Medium	Rockwell B84	2435K34	00000

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	8255K11	000000


		40	ANSI	1/2"	17	3/4"	3"	Steel	8255K31	00000
		50	ANSI	5/8"	15	5/8"	3 5/16"	Steel	8255K12	00000
		50	ANSI	5/8"	15	3/4"	3 5/16"	Steel	8255K32	00000
		60	ANSI	3/4"	13	5/8"	3 1/2"	Steel	8255K13	00000
		60	ANSI	3/4"	13	3/4"	3 1/2"	Steel	8255K33	00000
		80	ANSI	1"	12	5/8"	4 3/8"	Steel	8255K14	00000