• PATENTED high efficiency right angle helical gearbox
  • Ratios from 8/1 up to 148/1
  • Various mounting options
  • Accepts standard IEC flange and shaft
  • From 0.08kw up to 4kw
  • Strong, robust design

The STM SM – Skew Helical Gearbox range offers robust design and endurance. Features include a high efficiency right angle gearbox design that is patented to STM Spa.

With ratios from 8/1 through to 148/1, a selection of mounting positions and capacity of 0.08kw to 4kw, the SM – Skew Helical Gearbox is a practical solution to many applications. This STM gearbox range also accepts IEC flanges and shaft motors.

Perfect for weighty applications, its monolithic structure adds rigidity and strength.

Each SM – Skew Helical Gearbox incorporates two cylindrical helical reduction stages with skew axis.

STM produces housings and flanges from aluminium SG-ALSi UNI 1706 from state of the art CNC centres operating with numerical control to ensure optimum accuracy in construction.

Input shaft – steel 18NiCrMo5 UN EN 7846/ Fe 52 Uni7070
Gears – steel 18NiCrMo5 UNI 7486

A breather plug is enclosed with each gearbox size and before use, must be installed.

STM UK supplies each gearbox with a hollow output shaft. Accessories available include solid output shafts and torque arms – please contact our technical team for more details.


For further information, including Catalogues, Installation Manuals, Parts Lists or 2D/3D drawings please follow the link below:


Enquire Now

The latest tweet

Posted 4 days ago

Good luck @hoistuk https://t.co/APbtqi6uSO

Follow us

The latest news

Gearboxes for harsh environments

Posted by Andrew Ralston | Posted on 11.06.19

We really enjoy developing gearbox solutions for tricky applications.  We recently worked with a customer whose gearbox was located within a…

Keep Reading

Download our guide containing details and specification of our most popular products.