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)more

Unit of Measure

Specifications

Description 

 RT-F-38-TENSNR MM

Type

 Chain/Belt Tensioner

Element Material

 Natural Rubber

Style

 Elastomeric

Color

 Black

Dimensional Data

Tensioner

 RT F38-M

Mounting Bolt Size

 M12

Outside Diameter (Dim D)

 95 mm3.74 in

Overall Length (Dim E)

 140 mm5.51 in

Dimension T

 20.5 mm

Dimension L

 205 mm8.07 in

Dimension J-1

 175 mm6.89 in

Dimension J-2

 140 mm5.51 in

Dimension M

 16 mm

Dimension R

 17 mm

Dimension G

 10 mm0.39 in

Dimension O

 15 mm0.59 in

Dimension P

 12.5 mm0.49 in

Dimension K

 60 mm2.36 in

Performance Data

Normal Temperature Range

 -40 to 180 ºC-40 to 80 ºF

Mounting Bolt Torque

 210 N·m1859 in·lb

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

 730 N164.1 lb

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

 60 mm2.4 in

Notes

Notes 
  • 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).