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RunRight® RT F tensioners are designed for front mounting applications where access to back side or rear mounting surfaces is not possible. A single threaded hole is required to mount these tensioners. These tensioners include a special mounting screw and spacer bushing. They are manufactured with powder metal or cast iron housings, cast iron arms and inner square, come with the standard Tensys™ 10 rubber inserts, and can be used for applications operating within a -40° to 180°F (-40° to 80°C) temperature range.

Unit of Measure





N/A Chain/Belt Tensioner

Element Material

N/A Natural Rubber


N/A Elastomeric


N/A Black

UPC Number

N/A 85029

Dimensional Data


N/A RT F38-M

Mounting Bolt Size

N/A M12

Outside Diameter (Dim D)

N/A 95 mm3.74 in

Overall Length (Dim E)

N/A 140 mm5.51 in

Dimension T

N/A 20.5 mm

Dimension L

N/A 205 mm8.07 in

Dimension J-1

N/A 175 mm6.89 in

Dimension J-2

N/A 140 mm5.51 in

Dimension M

N/A 16 mm

Dimension R

N/A 17 mm

Dimension G

N/A 10 mm0.39 in

Dimension O

N/A 15 mm0.59 in

Dimension P

N/A 12.5 mm0.49 in

Dimension K

N/A 60 mm2.36 in

Performance Data

Normal Temperature Range

N/A -40 to 180 ºC-40 to 80 ºF

Mounting Bolt Torque

N/A 210 N·m1859 in·lb

Force at 20° Angle of Pretension (Normal Force Level) (Dimension F)

N/A 730 N164.1 lb

Distance at 20° Angle of Pretension (Normal Force Level) (Dimension S)

N/A 60 mm2.4 in



  • The recommended angle of pretension is 20°. This provides the tensioner a maximum capability to absorb vibrations and shock loads, while also maintaining a range of motion to address the system’s belt or chain stretch.
  • Mounting accessories into the “Hard” Position results in approximately 25% higher tensioning force over the “normal” position.
  • Metric standard tensioner units all come with a mounting screw, but do not come with the sprocket idler bolt (which is supplied instead with RunRight metric idler sprockets).
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