McMaster-Carr

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	Roller Chain Trade Size Roller Chain Trade Size

06B

08B

	Mounting Orientation Mounting Orientation

Vertical

Horizontal

	Tension Force Tension Force

2-4 lbs.

5-30 lbs.

7-13 lbs.

13-19 lbs.

13-29 lbs.

15-40 lbs.

20-60 lbs.

30-200 lbs.

45-100 lbs.

	Material Material

Steel

Plastic

	Housing Material Housing Material

Stainless Steel

Aluminum

Steel

	For Roller Chain Strand Type For Roller Chain Strand Type

Single

Double

Triple

	Thread Size Thread Size

1/2"-13

5/8"-11

3/4"-10

	Overall Depth Overall Depth

	Mounting Plate Height Mounting Plate Height

3 1/8"

	Tension Arm Length Tension Arm Length

3 13/16"

	Mounting Plate Width Mounting Plate Width

3 1/2"

	Overall Height Overall Height

	Overall Width Overall Width

	Roller Chain Standard Roller Chain Standard

ANSI

ISO

	Number of Mounting Holes Number of Mounting Holes

	Mounting Hole Diameter Mounting Hole Diameter

	Arm Rotation Arm Rotation

180°

360°

	Travel Height Travel Height

	Maximum Temperature Maximum Temperature

140° F

180° F

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76 Products

Spring-Loaded Adjustable-Arm
Roller Chain and Belt Tensioners

Vertical Mount

Horizontal Mount

Replacement Spring

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.

For technical drawings and 3-D models, click on a part number.

		Mounting Plate
Thread Size	Tension Force, lbs.	Ht.	Wd.	Tension Arm Lg.	Overall Dp.	Material	Arm Rotation	Includes		Each
Vertical Mount
1/2"-13	45	5"	3 1/2"	5"	2 7/8"	Steel	180°	Idler Shaft	00000000	0000000
5/8"-11	45	5"	3 1/2"	5"	2 7/8"	Steel	180°	Idler Shaft	00000000	000000
3/4"-10	45	5"	3 1/2"	5"	2 7/8"	Steel	180°	Idler Shaft	00000000	000000
Horizontal Mount
1/2"-13	45	3 1/8"	4"	5"	2 1/2"	Steel	180°	Idler Shaft	00000000	000000
5/8"-11	45	3 1/8"	4"	5"	2 1/2"	Steel	180°	Idler Shaft	00000000	000000
3/4"-10	45	3 1/8"	4"	5"	2 1/2"	Steel	180°	Idler Shaft	00000000	000000

Replacement Spring

00000000

Each

000000

Heavy Duty Belt and Roller Chain Tensioners

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. Idler shaft (sold separately) is required.

For technical drawings and 3-D models, click on a part number.

Tensioners

Tensioner Shown with Idler Shaft (Sold Separately)

Side View of Tensioner Shown with Idler Shaft (Sold Separately)

				Mounting Plate
Tension Force, lbs.	For Idler Bore Size	Tension Arm Lg.	Wd.	Lg.	Ht.	Material	Includes		Each
22	1"	5"	3"	8 11/16"	3 1/8"	Steel	Internal Spring	000000	0000000
44	1"	5"	3"	8 11/16"	3 1/8"	Steel	Internal Spring	000000	000000

Idler Shafts

(A)	(B)	Dia.	Thread Size	Thread Lg.	Material	Fabrication		Each
1 1/4"	2 1/8"	1"	3/4"-16	7/8"	Steel	Ground, Hardened	000000	000000
2 1/4"	3 1/8"	1"	3/4"-16	7/8"	Steel	Ground, Hardened	000000	00000
3 1/4"	4 1/8"	1"	3/4"-16	7/8"	Steel	Ground, Hardened	000000	00000

Adjustable-Arm Roller Chain and Belt Tensioners

Vertical Mount

Horizontal Mount

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

For technical drawings and 3-D models, click on a part number.

	Mounting Plate
Thread Size	Ht.	Wd.	Tension Arm Lg.	Overall Dp.	Material	Arm Rotation	Includes		Each
Vertical Mount
3/4"-10	5"	3 1/2"	3 13/16"	2"	Steel	360°	Idler Shaft	00000000	0000000
Horizontal Mount
3/4"-10	3 1/8"	4"	4"	3 3/8"	Steel	360°	Idler Shaft	00000000	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.

For technical drawings and 3-D models, click on a part number.

			Overall					Mounting Holes
For Roller Chain Trade Size	Tension Force, lbs.	Travel Ht.	Ht.	Wd.	Dp.	Material	Housing Material	Dia., mm	No. of	Mounting Fasteners Included	Max. Temperature, ° F		Each
For Single-Strand ANSI Roller Chain
Vertical/Horizontal Mount
35	2-4	0.6"	2 9/16"	2"	19/32"	Plastic	304 Stainless Steel	5	2	No	140°	000000	000000
35	13-19	0.6"	2 9/16"	2"	19/32"	Plastic	304 Stainless Steel	5	2	No	140°	0000000	00000

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.

For technical drawings and 3-D models, click on a part number.

			Overall					Mounting Holes
For Roller Chain Trade Size	Tension Force, lbs.	Travel Ht.	Ht.	Wd.	Dp.	Material	Housing Material	Dia.	No. of	Mounting Fasteners Included	Max. Temperature, ° F		Each
For Single-Strand ANSI Roller Chain
Vertical/Horizontal Mount
35	15-40	1.05"	5 15/32"	2 5/16"	1"	Plastic	Aluminum	3/8"	1	No	180°	0000000	0000000
35	15-40	1.05"	5 5/8"	2 5/16"	1"	Plastic	Aluminum	3/8"	1	No	180°	0000000	000000
40	15-40	1.05"	5 15/32"	2 5/16"	1"	Plastic	Aluminum	3/8"	1	No	180°	0000000	000000
40	15-40	1.05"	5 5/8"	2 5/16"	1"	Plastic	Aluminum	3/8"	1	No	180°	0000000	000000
50	20-60	1.2"	6 13/32"	2 31/32"	1 3/16"	Plastic	Aluminum	7/16"	1	No	180°	0000000	000000
50	20-60	1.2"	6 15/32"	2 31/32"	1 3/16"	Plastic	Aluminum	7/16"	1	No	180°	0000000	000000
60	20-60	1.2"	6 13/32"	2 31/32"	1 3/16"	Plastic	Aluminum	7/16"	1	No	180°	0000000	000000
60	20-60	1.2"	6 15/32"	2 31/32"	1 3/16"	Plastic	Aluminum	7/16"	1	No	180°	0000000	000000
80	45-100	1.5"	7 1/2"	3 9/16"	1 13/32"	Plastic	Aluminum	1/2"	1	No	180°	0000000	000000
80	45-100	1.5"	7 25/32"	3 9/16"	1 3/8"	Plastic	Aluminum	1/2"	1	No	180°	0000000	000000
81X	45-100	1.5"	7 1/2"	3 9/16"	1 11/32"	Plastic	Aluminum	1/2"	1	No	180°	0000000	000000
100	45-100	1.5"	7 1/2"	3 9/16"	1 11/32"	Plastic	Aluminum	1/2"	1	No	180°	0000000	000000
100	45-100	1.5"	7 25/32"	3 9/16"	1 3/8"	Plastic	Aluminum	1/2"	1	No	180°	0000000	000000
For Double-Strand ANSI Roller Chain
Vertical/Horizontal Mount
35	15-40	1.05"	5 15/32"	2 5/16"	1"	Plastic	Aluminum	3/8"	1	No	180°	0000000	000000
35	15-40	1.05"	5 5/8"	2 5/16"	1"	Plastic	Aluminum	3/8"	1	No	180°	0000000	000000
40	15-40	1.05"	5 15/32"	2 5/16"	1"	Plastic	Aluminum	3/8"	1	No	180°	0000000	000000
40	15-40	1.05"	5 5/8"	2 5/16"	1"	Plastic	Aluminum	3/8"	1	No	180°	0000000	000000
50	20-60	1.2"	6 13/32"	2 31/32"	1 3/16"	Plastic	Aluminum	7/16"	1	No	180°	0000000	000000
50	20-60	1.2"	6 15/32"	2 31/32"	1 3/16"	Plastic	Aluminum	7/16"	1	No	180°	0000000	000000
60	20-60	1.2"	6 13/32"	2 31/32"	1 3/16"	Plastic	Aluminum	7/16"	1	No	180°	0000000	000000
60	20-60	1.2"	6 15/32"	2 31/32"	1 3/16"	Plastic	Aluminum	7/16"	1	No	180°	0000000	000000
80	45-100	1.5"	7 1/2"	3 9/16"	1 11/32"	Plastic	Aluminum	1/2"	1	No	180°	0000000	000000
80	45-100	1.5"	7 25/32"	3 9/16"	1 3/8"	Plastic	Aluminum	1/2"	1	No	180°	0000000	000000
For Triple-Strand ANSI Roller Chain
Vertical/Horizontal Mount
35	15-40	1.05"	5 15/32"	2 5/16"	1"	Plastic	Aluminum	3/8"	1	No	180°	0000000	000000
35	15-40	1.05"	5 5/8"	2 5/16"	1"	Plastic	Aluminum	3/8"	1	No	180°	0000000	000000
40	15-40	1.05"	5 15/32"	2 5/16"	1"	Plastic	Aluminum	3/8"	1	No	180°	0000000	000000
40	15-40	1.05"	5 5/8"	2 5/16"	1"	Plastic	Aluminum	3/8"	1	No	180°	0000000	000000
50	20-60	1.2"	6 13/32"	2 31/32"	1 3/16"	Plastic	Aluminum	7/16"	1	No	180°	0000000	000000
50	20-60	1.2"	6 15/32"	2 31/32"	1 3/16"	Plastic	Aluminum	7/16"	1	No	180°	0000000	000000
For Single-Strand ISO Roller Chain
Vertical/Horizontal Mount
06B	5-30	1.05"	5 15/32"	2 5/16"	1"	Plastic	Aluminum	3/8"	1	No	180°	0000000	000000
06B	5-30	1.05"	5 5/8"	2 5/16"	1"	Plastic	Aluminum	3/8"	1	No	180°	0000000	000000
06B	15-40	1.05"	5 15/32"	2 5/16"	1"	Plastic	Aluminum	3/8"	1	No	180°	0000000	000000
06B	15-40	1.05"	5 5/8"	2 5/16"	1"	Plastic	Aluminum	3/8"	1	No	180°	0000000	000000
08B	15-40	1.05"	5 15/32"	2 5/16"	1"	Plastic	Aluminum	3/8"	1	No	180°	0000000	000000
08B	15-40	1.05"	5 5/8"	2 5/16"	1"	Plastic	Aluminum	3/8"	1	No	180°	0000000	000000
10B	20-60	1.2"	6 13/32"	2 31/32"	1 3/16"	Plastic	Aluminum	7/16"	1	No	180°	0000000	000000
10B	20-60	1.2"	6 15/32"	2 31/32"	1 3/16"	Plastic	Aluminum	7/16"	1	No	180°	0000000	000000
12B	20-60	1.2"	6 13/32"	2 31/32"	1 3/16"	Plastic	Aluminum	7/16"	1	No	180°	0000000	000000
12B	20-60	1.2"	6 15/32"	2 31/32"	1 3/16"	Plastic	Aluminum	7/16"	1	No	180°	0000000	000000
16B	45-100	1.5"	7 1/2"	3 9/16"	1 11/32"	Plastic	Aluminum	1/2"	1	No	180°	0000000	000000
16B	45-100	1.5"	7 25/32"	3 9/16"	1 3/8"	Plastic	Aluminum	1/2"	1	No	180°	0000000	000000
20B	30-200	1"	7 1/2"	3 9/16"	1 11/32"	Plastic	Aluminum	1/2"	1	No	180°	0000000	000000
20B	45-100	1.5"	7 1/2"	3 9/16"	1 11/32"	Plastic	Aluminum	1/2"	1	No	180°	0000000	000000
For Double-Strand ISO Roller Chain
Vertical/Horizontal Mount
06B	15-40	1.05"	5 15/32"	2 5/16"	1"	Plastic	Aluminum	3/8"	1	No	180°	0000000	000000
06B	15-40	1.05"	5 5/8"	2 5/16"	1"	Plastic	Aluminum	3/8"	1	No	180°	0000000	000000
08B	15-40	1.05"	5 15/32"	2 5/16"	1"	Plastic	Aluminum	3/8"	1	No	180°	0000000	000000
08B	15-40	1.05"	5 5/8"	2 5/16"	1"	Plastic	Aluminum	3/8"	1	No	180°	0000000	000000
10B	20-60	1.2"	6 13/32"	2 31/32"	1 3/16"	Plastic	Aluminum	7/16"	1	No	180°	0000000	000000
10B	20-60	1.2"	6 15/32"	2 31/32"	1 3/16"	Plastic	Aluminum	7/16"	1	No	180°	0000000	000000
12B	20-60	1.2"	6 15/32"	2 31/32"	1 3/16"	Plastic	Aluminum	7/16"	1	No	180°	0000000	000000
16B	45-100	1.5"	7 1/2"	3 9/16"	1 11/32"	Plastic	Aluminum	1/2"	1	No	180°	0000000	000000
16B	45-100	1.5"	7 25/32"	3 9/16"	1 3/8"	Plastic	Aluminum	1/2"	1	No	180°	0000000	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.

For technical drawings and 3-D models, click on a part number.

			Overall					Mounting Holes
For Roller Chain Trade Size	Tension Force, lbs.	Travel Ht.	Ht.	Wd.	Dp.	Material	Housing Material	Dia., mm	No. of	Mounting Fasteners Included	Max. Temperature, ° F		Each
For Single-Strand ANSI Roller Chain
Vertical/Horizontal Mount
25, 35	7-13	1.6"	3 25/32"	2 25/32"	1 1/4"	Plastic	Steel	6	2	No	140°	000000	0000000
25, 35	13-29	1.6"	3 25/32"	2 25/32"	1 1/4"	Plastic	Steel	6	2	No	140°	000000	000000
40	7-13	1.6"	3 25/32"	2 25/32"	1 1/4"	Plastic	Steel	6	2	No	140°	000000	000000
40	13-29	1.6"	3 25/32"	2 25/32"	1 1/4"	Plastic	Steel	6	2	No	140°	000000	000000
50	7-13	1.6"	3 25/32"	2 25/32"	1 1/4"	Plastic	Steel	6	2	No	140°	000000	000000
50	13-29	1.6"	3 25/32"	2 25/32"	1 1/4"	Plastic	Steel	6	2	No	140°	000000	000000
60	7-13	1.6"	3 25/32"	2 25/32"	1 1/4"	Plastic	Steel	6	2	No	140°	000000	000000
60	13-29	1.6"	3 25/32"	2 25/32"	1 1/4"	Plastic	Steel	6	2	No	140°	000000	000000

Terms and Conditions and Privacy Policy

Spring-Loaded Adjustable-ArmRoller Chain and Belt Tensioners

Heavy Duty Belt and Roller Chain Tensioners

Adjustable-Arm Roller Chain and Belt Tensioners

Ultra-Low-Profile Channel-Guided Roller Chain Tensioners

Channel-Guided Roller Chain Tensioners

Low-Profile Channel-Guided Roller Chain Tensioners

Spring-Loaded Adjustable-Arm
Roller Chain and Belt Tensioners