+31 (0)35-5882450 Extreme duty torque wrenches for heavy-duty applications

SDM gearboxes

Max torque: 680 Nm

For applications where tool access to the bolt is limited, The SDM (Small Diameter Multiplier) Gearboxes can provide you with a solution.

Based on RAD’s long experience with planetary gear reduction technology, the SDM Gearboxes were originally designed for confined space applications in the aerospace industry. However, these versatile tools are suitable for many industries where difficult to reach bolts need to be tightened.

The SDM Gearboxes can be combined with standard industry nutrunners (pneumatic, battery, electric) and have a maximum torque output up to 680 Nm. Final torque and RPM depend on the chosen SDM gearbox model, its ratio and the capacity of the chosen nutrunner. Torque accuracy and repeatability will depend on the chosen nutrunner.


All SDM Gearboxes are delivered with:

  • SDM gearbox
  • Standard tombstone mounting plate
  • Calibration certificate


  • Mostly, bespoke reaction arms are needed for SDM applications. Therefore, reaction arms are not included.



Product range linedrawing_sdm
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🠋 28490SDM Gearbox 3401:23340 Nm¼"½"0,3 Kg55 mm48 mm48 mmn/a
🠋 28530SDM Gearbox 3401:23340 Nm⅜"½"0,3 Kg55 mm48 mm48 mmn/a
🠋 28520SDM Gearbox 3401:23340 Nm¼"¾"0,3 Kg55 mm48 mm48 mmn/a
🠋 28570SDM Gearbox 6801:23680 Nm⅜"¾"0,4 Kg55 mm48 mm48 mmn/a
🠋 28550SDM Gearbox 3401:65340 Nm¼"½"0,3 Kg69 mm48 mm48 mmn/a
🠋 28560SDM Gearbox 3401:65340 Nm⅜"½"0,3 Kg69 mm48 mm48 mmn/a
🠋 28480SDM Gearbox 6801:65680 Nm¼"¾"0,4 Kg69 mm48 mm48 mmn/a
🠋 28510SDM Gearbox 6801:65680 Nm⅜"¾"0,4 Kg69 mm48 mm48 mmn/a
🠋 28470SDM Gearbox 6801:93680 Nm¼"¾"0,4 Kg69 mm48 mm48 mmn/a
🠋 28500SDM Gearbox 6801:93680 Nm⅜"¾"0,4 Kg69 mm48 mm48 mmn/a


RAD also offers the SDM Gearboxes as a complete toolkit. This is a turnkey SDM combined with an angled battery nutrunner. Please take a look at SDM Battery Series for more information.