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DFARS Specialty Metals
Adjustable-Arm Roller Chain and Belt Tensioners

Vertical Mount

Horizontal Mount Shown with Sprocket (Not Included)
Mounting Plate | |||||||||
---|---|---|---|---|---|---|---|---|---|
Thread Size | Ht. | Wd. | Tension Arm Lg. | Overall Dp. | Material | Arm Rotation | Includes | Each | |
Vertical Mount | |||||||||
3/8"-16 | 3 1/4" | 2" | 2 1/2" | 1 3/8" | Steel | 360° | Idler Shaft | 00000000 | 0000000 |
1/2"-13 | 5" | 3 1/2" | 3 13/16" | 2" | Steel | 360° | Idler Shaft | 00000000 | 000000 |
5/8"-11 | 5" | 3 1/2" | 3 13/16" | 2" | Steel | 360° | Idler Shaft | 00000000 | 000000 |
3/4"-10 | 5" | 3 1/2" | 3 13/16" | 2" | Steel | 360° | Idler Shaft | 00000000 | 000000 |
Horizontal Mount | |||||||||
3/8"-16 | 2 5/16" | 2 1/4" | 2 1/2" | 2" | Steel | 360° | Idler Shaft | 00000000 | 000000 |
1/2"-13 | 3 1/4" | 4" | 3 13/16" | 3 3/8" | Steel | 360° | Idler Shaft | 00000000 | 000000 |
5/8"-11 | 3 1/4" | 4" | 3 13/16" | 3 3/8" | Steel | 360° | Idler Shaft | 00000000 | 000000 |
3/4"-10 | 3 1/8" | 4" | 4" | 3 3/8" | Steel | 360° | Idler Shaft | 00000000 | 000000 |
1"-14 | 7 3/8" | 7 1/2" | 6 1/2" | 11 1/4" | Cast Iron | 360° | Idler Shaft | 000000000 | 000000 |
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.
For technical drawings and 3-D models, click on a part number.
Mounting Plate | |||||||
---|---|---|---|---|---|---|---|
For Idler ID | Ht. | Wd. | Overall Dp. | Material | Includes | Each | |
Vertical/Horizontal Mount | |||||||
1/4" | 5 7/8" | 1 1/2" | 3 1/8" | Steel | Idler Shaft | 00000000 | 0000000 |
3/8" | 5 7/8" | 1 1/2" | 3 1/8" | Steel | Idler Shaft | 00000000 | 000000 |
1/2" | 5 7/8" | 1 1/2" | 3 1/8" | Steel | Idler Shaft | 000000 | 000000 |
5/8" | 9" | 2" | 4 5/16" | Steel | Idler Shaft | 00000000 | 000000 |
3/4" | 9" | 2" | 4 5/16" | Steel | Idler Shaft | 00000000 | 000000 |
7/8" | 9" | 2" | 4 5/16" | Steel | Idler Shaft | 000000 | 000000 |
1 1/8" | 13" | 3" | 6" | Steel | Idler Shaft | 000000 | 000000 |
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.
Tensioners | |||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Mounting Plate | Replacement Springs | ||||||||||||
Thread Size | Tension Force, lbs. | 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° | 2 7/8" | Steel | 180° | Idler Shaft, Internal Spring | 000000000 | 0000000 | 00000000 | 000000 |
1/2"-13 | 45 | 5" | 3 1/2" | 5" | ±45° | 2 7/8" | Steel | 180° | Idler Shaft, Internal Spring | 00000000 | 000000 | 00000000 | 00000 |
5/8"-11 | 45 | 5" | 3 1/2" | 5" | ±45° | 2 7/8" | Steel | 180° | Idler Shaft, Internal Spring | 00000000 | 000000 | 00000000 | 00000 |
3/4"-10 | 45 | 5" | 3 1/2" | 5" | ±45° | 2 7/8" | Steel | 180° | Idler Shaft, Internal Spring | 00000000 | 000000 | 00000000 | 00000 |
Horizontal Mount | |||||||||||||
3/8"-16 | 45 | 3 1/8" | 4" | 5" | ±45° | 2 1/2" | Steel | 180° | Idler Shaft, Internal Spring | 000000000 | 000000 | 00000000 | 00000 |
1/2"-13 | 45 | 3 1/8" | 4" | 5" | ±45° | 2 1/2" | Steel | 180° | Idler Shaft, Internal Spring | 00000000 | 000000 | 00000000 | 00000 |
5/8"-11 | 45 | 3 1/8" | 4" | 5" | ±45° | 2 1/2" | Steel | 180° | Idler Shaft, Internal Spring | 00000000 | 000000 | 00000000 | 00000 |
3/4"-10 | 45 | 3 1/8" | 4" | 5" | ±45° | 2 1/2" | Steel | 180° | Idler Shaft, Internal Spring | 00000000 | 000000 | 00000000 | 00000 |