Drive Chain Tensioners | McMaster-Carr

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97 Products

Adjustable-Screw Roller Chain and Belt Tensioners

Tensioners take up slack and allow you to adjust tension on your roller chain or belt. Precisely apply tension in a straight line by moving the adjustment screw. They are for use with idler sprockets or pulleys.

		Mounting Plate
Tension Force	For Idler ID	Ht.	Wd.	Overall Dp.	Material	Includes		Each







			Vertical Mount/Horizontal Mount

			Not Rated	1/4"	5 7/8"	1 1/2"	3 1/8"	Steel	Idler Shaft	6265K111	0000000


			Not Rated	3/8"	5 7/8"	1 1/2"	3 1/8"	Steel	Idler Shaft	6265K112	000000
			Not Rated	1/2"	5 7/8"	1 1/2"	3 1/8"	Steel	Idler Shaft	6265K5	000000
			Not Rated	5/8"	9"	2"	4 5/16"	Steel	Idler Shaft	6265K113	000000
			Not Rated	3/4"	9"	2"	4 5/16"	Steel	Idler Shaft	6265K114	000000
			Not Rated	7/8"	9"	2"	4 5/16"	Steel	Idler Shaft	6265K1	000000
			Not Rated	1 1/8"	13"	3"	6"	Steel	Idler Shaft	6265K2	000000

Adjustable-Arm Roller Chain and Belt Tensioners


Vertical Mount Shown with Sprocket (Not Included)	Horizontal Mount Shown with Sprocket (Not Included)

Tensioners take up slack and allow you to adjust tension on your roller chain or belt. Position the adjustment arm to control tension in a 360° arc. They are for use with idler sprockets or pulleys.

		Mounting Plate
Thread Size	Tension Force	Ht.	Wd.	Tension Arm Lg.	Overall Dp.	Material	Arm Rotation	Includes		Each







			Vertical Mount

			3/8"-16	Not Rated	3 1/4"	2"	2 1/2"	1 3/8"	Steel	360°	Idler Shaft	60225K11	0000000


			1/2"-13	Not Rated	5"	3 1/2"	3 13/16"	2"	Steel	360°	Idler Shaft	60225K12	000000
			5/8"-11	Not Rated	5"	3 1/2"	3 13/16"	2"	Steel	360°	Idler Shaft	60225K13	000000
			3/4"-10	Not Rated	5"	3 1/2"	3 13/16"	2"	Steel	360°	Idler Shaft	60225K25	000000




					Horizontal Mount

					3/8"-16	Not Rated	2 1/8"	2 1/4"	2 5/16"	2"	Steel	360°	Idler Shaft	60225K14	000000


					1/2"-13	Not Rated	3 5/16"	4"	3 13/16"	3 3/8"	Steel	360°	Idler Shaft	60225K15	000000
					5/8"-11	Not Rated	3 1/4"	4"	3 13/16"	3 3/8"	Steel	360°	Idler Shaft	60225K16	000000
					3/4"-10	Not Rated	3 5/16"	4"	3 13/16"	3 3/8"	Steel	360°	Idler Shaft	60225K26	000000
					1"-14	Not Rated	7 3/8"	7 1/2"	6 1/2"	11 1/4"	Cast Iron	360°	Idler Shaft	60225K311	000000

Floating Roller Chain Tensioners

Mount these tensioners directly onto your chain drive. They have adjustable straps that take up slack and apply constant tension. Because they engage with the side plates instead of the rollers, they increase the life of your roller chain.

UHMW Polyethylene—UHMW polyethylene tensioners are stronger and more durable than PTFE tensioners.

PTFE—PTFE tensioners handle temperatures up to 450° F, more than twice as high as UHMW and titanium models.

Titanium—Titanium tensioners stand up to harsh and dirty environments. They're stronger and more durable than plastic tensioners. And with a low coefficient of friction, they work with chain that has little or no lubrication.

			Overall
	For Roller Chain Trade No.	For Strand Type	Ht.	Wd.	Dp.	Housing Material	Strap Material	Max. Temp., ° F		Each
For ANSI Chain







				UHMW Polyethylene

				25	Single	12"	2 1/2"	1 3/32"	304 Stainless Steel	HDPE	180	5973K1	000000


				35	Single	12"	2 1/2"	1 3/32"	304 Stainless Steel	HDPE	180	5973K2	00000
				40, 41, 52, 25-2	Single, Double	12"	3"	2 11/16"	304 Stainless Steel	HDPE	180	5973K3	00000
				50	Single	12"	3 1/2"	2 7/8"	304 Stainless Steel	HDPE	180	5973K4	000000
				60, 35-2, 40-2, 35-3	Single, Double, Triple	12"	4"	3 1/8"	304 Stainless Steel	HDPE	180	5973K5	000000
				76, 100, 60-2, 40-3	Single, Double, Triple	16"	5"	4 1/16"	304 Stainless Steel	HDPE	180	5973K7	000000
				80, 50-2, 35-4	Single, Double, Quadruple	16"	4 1/2"	3 3/4"	304 Stainless Steel	HDPE	180	5973K6	000000
				120, 80-2, 50-3, 40-4	Single, Double, Triple, Quadruple	16"	5 1/2"	4 13/16"	304 Stainless Steel	HDPE	180	5973K8	000000
				200, 100-2, 80-3, 60-4, 50-5, 40-6	Single, Double, Triple, Quadruple, Fivefold, Sixfold	24"	7 1/2"	6"	304 Stainless Steel	HDPE	180	5973K204	000000




						PTFE

						35	Single	12"	2 1/2"	1 3/32"	304 Stainless Steel	Galvanized Steel	450	5973K211	000000


						40, 41, 52, 25-2	Single, Double	12"	3"	2 11/16"	304 Stainless Steel	Galvanized Steel	450	5973K212	000000
						50	Single	12"	3 1/2"	2 7/8"	304 Stainless Steel	Galvanized Steel	450	5973K213	000000
						60, 35-2, 40-2, 35-3	Single, Double, Triple	12"	4"	3 1/8"	304 Stainless Steel	Galvanized Steel	450	5973K214	000000




								Titanium

								25	Single	12"	2 1/2"	1 3/32"	304 Stainless Steel	HDPE	180	5973K224	000000


								35	Single	12"	2 1/2"	1 3/32"	304 Stainless Steel	HDPE	180	5973K225	000000
								40, 41, 52, 25-2	Single, Double	12"	3"	2 11/16"	304 Stainless Steel	HDPE	180	5973K226	000000
								50	Single	12"	3 1/2"	2 7/8"	304 Stainless Steel	HDPE	180	5973K227	000000
								60, 35-2, 40-2, 35-3	Single, Double, Triple	12"	4"	3 1/8"	304 Stainless Steel	HDPE	180	5973K228	000000
								76, 100, 60-2, 40-3	Single, Double, Triple	16"	5"	4 1/16"	304 Stainless Steel	HDPE	180	5973K231	000000
								80, 50-2, 35-4	Single, Double, Quadruple	16"	4 1/2"	3 3/4"	304 Stainless Steel	HDPE	180	5973K229	000000
								120, 80-2, 50-3, 40-4	Single, Double, Triple, Quadruple	16"	5 1/2"	4 13/16"	304 Stainless Steel	HDPE	180	5973K232	000000

Heavy Duty Spring-Loaded Adjustable-Arm Roller Chain and Belt Tensioners


Tensioner Shown with Idler Shaft (Sold Separately)

Maintain correct drive tension to ensure smooth operation for maximum power and a long service life. Designed for use on large belt and chain drives, tensioners are spring loaded to provide constant tension and automatic adjustments for pulsating loads. Adjust the arm to control tension in a 360° arc. Idler shaft (sold separately) is required.

			Mounting Plate
Tension Force, lbf	For Idler ID	Wd.	Lg.	Ht.	Tension Arm Lg.	Deflection Angle	Material	Arm Rotation	Includes		Each



	22	1"	3"	8 11/16"	3 1/8"	5"	-90° to 90°	Steel	360°	Internal Spring	1816K1	0000000


	44	1"	3"	8 11/16"	3 1/8"	5"	-45° to 45°	Steel	360°	Internal Spring	1816K2	000000

Idler Shafts

			Overall		Thread
	Dia.	Lg.	Lg.	Dia.	Size	Lg.	Edge Type	Fabrication	Hardness Rating	Hardness	Includes		Each
Shaft Collar End







				1215 Carbon Steel

				1"	1 1/2"	3 3/8"	1 1/2"	3/4"-16	7/8"	Chamfered	Hardened	Extra Hard	Rockwell C58	Grease Fitting	1816K3	000000


				1"	2 1/2"	4 3/8"	1 1/2"	3/4"-16	7/8"	Chamfered	Hardened	Extra Hard	Rockwell C58	Grease Fitting	1816K4	00000
				1"	3 1/2"	5 3/8"	1 1/2"	3/4"-16	7/8"	Chamfered	Hardened	Extra Hard	Rockwell C58	Grease Fitting	1816K5	00000

Thread-Mount Idler Rotary Shafts


Tensioner Shown with Idler Shaft (Sold Separately)	Shaft Collar End	Shaft Collar 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.

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



		1"	1 1/2"	3 3/8"	1 1/2"	3/4"-16	7/8"	Chamfered	Hardened	Extra Hard	Rockwell C58	1816K3	000000


		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

Spring-Loaded Adjustable-Arm Roller Chain and Belt Tensioners


Vertical Mount	Horizontal Mount	Replacement Springs

Tensioners take up slack and allow you to adjust tension on your roller chain or belt. A built-in spring allows the adjustment arm to apply continuous tension. They are for use with idler sprockets or pulleys.

Tensioners												Replacement Springs
		Mounting Plate
Thread Size	Tension Force, lbf	Ht.	Wd.	Tension Arm Lg.	Deflection Angle	Overall Dp.	Material	Arm Rotation	Includes		Each		Each







			Vertical Mount

			3/8"-16	45	5"	3 1/2"	5"	-45° to 45°	2 7/8"	Steel	180°	Idler Shaft, Internal Spring	60225K191	0000000	60225K29	000000


			1/2"-13	45	5"	3 1/2"	4 7/16"	-45° to 45°	2 7/8"	Steel	180°	Idler Shaft, Internal Spring	60225K21	000000	60225K29	00000
			5/8"-11	45	5"	3 1/2"	4 7/16"	-45° to 45°	2 7/8"	Steel	180°	Idler Shaft, Internal Spring	60225K22	000000	60225K29	00000
			3/4"-10	45	5"	3 1/2"	4 7/16"	-45° to 45°	2 7/8"	Steel	180°	Idler Shaft, Internal Spring	60225K27	000000	60225K29	00000




					Horizontal Mount

					3/8"-16	45	3 1/8"	4"	5"	-45° to 45°	2 1/2"	Steel	180°	Idler Shaft, Internal Spring	60225K192	000000	60225K29	00000


					1/2"-13	45	3 3/8"	3 1/4"	5"	-45° to 45°	4 5/16"	Steel	180°	Idler Shaft, Internal Spring	60225K23	000000	60225K29	00000
					5/8"-11	45	3 3/8"	3 1/4"	5"	-45° to 45°	4 5/16"	Steel	180°	Idler Shaft, Internal Spring	60225K24	000000	60225K29	00000
					3/4"-10	45	3 3/8"	3 1/4"	5"	-45° to 45°	4 5/16"	Steel	180°	Idler Shaft, Internal Spring	60225K28	000000	60225K29	00000

Jaw-End Roller Chain Pullers


Knob Handle	T-Handle

Hook into your roller chain and use the handle to tighten the jaw until the chain ends are close enough to add or remove a link.

					Overall
	For Roller Chain Trade No.	Handle Style	For Roller Chain Pitch	Max. Jaw Cap.	Lg.	Wd.	Material		Each
For Single-Strand ANSI Roller Chain



		25, 35	Knob	1/4" to 3/8"	2"	4 1/4"	2 3/4"	Steel	6052K12	000000


		35, 40, 41, 50, 60	Knob	3/8" to 3/4"	2"	4 1/4"	2 3/4"	Steel	6052K14	00000
		40, 50, 60, 80	T-Handle	1/2" to 1"	3 1/2"	6 5/8"	4"	Steel	6052K18	00000
		80, 100, 120, 140, 160, 180, 200, 240	T-Handle	1" to 3"	5"	8 1/2"	5 3/4"	Steel	6052K16	00000

Roller Chain Tensioning Rings

Install these rings between strands of chain to absorb slack without the need for realignment, lubrication, or tools—good for use in confined spaces where maintenance may be difficult.

	Tension Force, lbf	OD	Material	Max. Speed, fpm	Max. Temp., ° F		Each
For Single-Strand ANSI Roller Chain



	35	1	3.539"	Plastic	1,020	155	5896K1	0000000


	For Single-Strand ANSI, ISO Roller Chain



			40, 08B	3	4.154"	Plastic	1,470	155	5896K2	000000


			40, 08B	3	4.783"	Plastic	1,470	155	5896K16	000000
			40, 08B	3	4.783"	Plastic	1,690	155	5896K14	000000
			40, 08B	4	5.413"	Plastic	1,730	155	5896K15	000000
			50, 10B	6	5.055"	Plastic	820	155	5896K4	000000
			50, 10B	10	6.693"	Plastic	1,730	155	5896K18	000000
			60, 12B	7	7.173"	Plastic	1,220	155	5896K7	000000
			60, 12B	8	6.102"	Plastic	1,060	155	5896K6	000000
			60, 12B	15	8.169"	Plastic	1,250	155	5896K19	000000
			80, 16B	21	8.15"	Plastic	1,120	155	5896K8	000000
			100, 20B	18	11.957"	Plastic	1,370	140	5896K22	000000


			For Single-Strand ISO Roller Chain



					05B	0.5	3.012"	Plastic	980	155	5896K111	000000

Channel-Guided Roller Chain Tensioners

Built-in springs put constant tension on roller chain to absorb and buffer shock, reduce vibration, and improve drive performance.

				Overall					Mounting Holes
	For Roller Chain Trade No.	Tension Force, lbf	Travel Ht.	Ht.	Wd.	Dp.	Material	Housing Material	Dia.	No. of	Mounting Fasteners Included	Max. Temp., ° F		Each
For Single-Strand ANSI Roller Chain







				Vertical Mount/Horizontal Mount

				35	15 to 40	1.05"	5 15/32"	2 5/16"	1"	Plastic	Aluminum	3/8"	1	No	180	6233K62	0000000


				35	15 to 40	1.05"	5 19/32"	2 5/16"	1"	Plastic	Aluminum	3/8"	1	No	180	6233K33	000000
				40	15 to 40	1.05"	5 15/32"	2 5/16"	1"	Plastic	Aluminum	3/8"	1	No	180	6233K63	000000
				40	15 to 40	1.05"	5 19/32"	2 5/16"	1"	Plastic	Aluminum	3/8"	1	No	180	6233K34	000000
				50	20 to 60	1.2"	6 13/32"	2 15/16"	1 3/16"	Plastic	Aluminum	7/16"	1	No	180	6233K35	000000
				50	20 to 60	1.2"	6 15/32"	2 15/16"	1 3/16"	Plastic	Aluminum	7/16"	1	No	180	6233K64	000000
				60	20 to 60	1.2"	6 13/32"	2 15/16"	1 3/16"	Plastic	Aluminum	7/16"	1	No	180	6233K36	000000
				60	20 to 60	1.2"	6 15/32"	2 15/16"	1 3/16"	Plastic	Aluminum	7/16"	1	No	180	6233K65	000000
				80	45 to 100	1.5"	7 1/2"	3 17/32"	1 3/8"	Plastic	Aluminum	1/2"	1	No	180	6233K37	000000
				80	45 to 100	1.5"	7 25/32"	3 17/32"	1 3/8"	Plastic	Aluminum	1/2"	1	No	180	6233K66	000000
				100	45 to 100	1.5"	7 1/2"	3 17/32"	1 3/8"	Plastic	Aluminum	1/2"	1	No	180	6233K38	000000


				100	45 to 100	1.5"	7 25/32"	3 17/32"	1 3/8"	Plastic	Aluminum	1/2"	1	No	180	6233K67	000000


				For Double Strand ANSI Chain







								Vertical Mount/Horizontal Mount

								40	15 to 40	1.05"	5 15/32"	2 5/16"	1"	Plastic	Aluminum	3/8"	1	No	180	6233K75	000000


								40	15 to 40	1.05"	5 19/32"	2 5/16"	1"	Plastic	Aluminum	3/8"	1	No	180	6233K43	000000
								60	20 to 60	1.2"	6 15/32"	2 15/16"	1 3/16"	Plastic	Aluminum	7/16"	1	No	180	6233K77	000000


								For Single-Strand ISO Roller Chain







												Vertical Mount/Horizontal Mount

												06B	5 to 30	1.05"	5 19/32"	2 5/16"	1"	Plastic	Aluminum	3/8"	1	No	180	6233K88	000000

Ultra-Low-Profile Channel-Guided Roller Chain Tensioners

Able to fit in tight spots, these tensioners are less than 3" tall. Built-in springs put constant tension on roller chain to absorb and buffer shock, reduce vibration, and improve drive performance.

				Overall					Mounting Holes
	For Roller Chain Trade No.	Tension Force, lbf	Travel Ht.	Ht.	Wd.	Dp.	Material	Housing Material	Dia., mm	No. of	Mounting Fasteners Included	Max. Temp., ° F		Each
For Single-Strand ANSI Roller Chain







				Vertical Mount/Horizontal Mount

				35	2 to 4	0.6"	2 9/16"	2"	19/32"	Plastic	304 Stainless Steel	5	2	No	140	7332K9	0000000


				35	13 to 19	0.6"	2 9/16"	2"	19/32"	Plastic	304 Stainless Steel	5	2	No	140	7332K11	000000

Low-Profile Channel-Guided Roller Chain Tensioners

At less than 4" in height, these tensioners are good for use on low-clearance drives. Built-in springs put constant tension on roller chain to absorb and buffer shock, reduce vibration, and improve drive performance.

				Overall					Mounting Holes
	For Roller Chain Trade No.	Tension Force, lbf	Travel Ht.	Ht.	Wd.	Dp.	Material	Housing Material	Dia., mm	No. of	Mounting Fasteners Included	Max. Temp., ° F		Each
For Single-Strand ANSI Roller Chain







				Vertical Mount/Horizontal Mount

				25, 35	7 to 13	1.6"	3 25/32"	2 25/32"	1 1/4"	Plastic	Steel	6	2	No	140	7332K1	0000000


				25, 35	13 to 29	1.6"	3 25/32"	2 25/32"	1 1/4"	Plastic	Steel	6	2	No	140	7332K5	000000
				40	7 to 13	1.6"	3 25/32"	2 25/32"	1 1/4"	Plastic	Steel	6	2	No	140	7332K2	000000
				40	13 to 29	1.6"	3 25/32"	2 25/32"	1 1/4"	Plastic	Steel	6	2	No	140	7332K6	000000
				50	7 to 13	1.6"	3 25/32"	2 25/32"	1 1/4"	Plastic	Steel	6	2	No	140	7332K3	000000
				50	13 to 29	1.6"	3 25/32"	2 25/32"	1 1/4"	Plastic	Steel	6	2	No	140	7332K7	000000
				60	7 to 13	1.6"	3 25/32"	2 25/32"	1 1/4"	Plastic	Steel	6	2	No	140	7332K4	000000
				60	13 to 29	1.6"	3 25/32"	2 25/32"	1 1/4"	Plastic	Steel	6	2	No	140	7332K8	000000

Heavy Duty Spring-Loaded Roller Chain and Belt Tensioners


Tensioner Shown with Idler Shaft (Sold Separately)

Designed for large belt and chain drives, these tensioners maintain correct drive tension for smooth operation, maximum power, and a long service life. They're spring loaded, which keeps constant tension on a belt or chain and automatically adjusts for changes in loads. An idler shaft (sold separately) is required.

			Mounting Plate		Overall			Mounting Holes
Tension Force, lbf	For Idler ID	Travel Ht.	Ht.	Wd.	Ht.	Dp.	Material	No. of	Lg.	Mounting Fasteners Included		Each



	84	1 1/2"	3"	7"	6"	18 5/16"	3 3/16"	Cast Iron	4	1 7/8"	Yes	5847N11	0000000

Idler Shafts

			Overall		Thread
	Dia.	Lg.	Lg.	Dia.	Size	Lg.	Edge Type	Fabrication	Hardness Rating	Hardness	Includes		Each
Shaft Collar End







				1215 Carbon Steel

				1 1/2"	3 1/4"	5 11/16"	2 1/4"	1"-14	1 5/16"	Chamfered	Hardened	Extra Hard	Rockwell C58	Grease Fitting	2435K104	000000


				1 1/2"	5 1/4"	7 11/16"	2 1/4"	1"-14	1 5/16"	Chamfered	Hardened	Extra Hard	Rockwell C58	Grease Fitting	2435K105	00000