After sales

Welcome to the area dedicated to after-sales, a service created to ensure a high standard in response time.

A direct channel of communication by e-mail is active: for STM gearboxes or for GSM gearboxes.

Download, fill in and send the following forms to or


STM & GSM manufacture very high quality products but, should anything go wrong, a very detailed and efficient pre and after-sales assistance is guaranteed 24 hours a day, all over the world. A qualified network of salesmen and technicians is ready to solve any problem in the shortest time and in the best way.


              STM                GSM
STM: After sales form   GSM: After sales form