Belt conveyor backstop

Mechanical safety components for belt conveyors, bucket elevators, shovel wheels, stackers and screens; also for hoists and crushers in the mining sector. > more

Société Industrielle d’Applications Mécaniques

SIAM RINGSPANN S.A., based in Lyon, has been renowned for its expertise in industrial freewheels since it was founded in 1932. It developed the first freewheels with ramps for the safe handling of heavy loads.

It became part of the RINGSPANN GmbH Group (Bad Homburg, Germany) in 1978.


Designer and manufacturer of mechanical transmission components, push-pull cables and precision clamping fixtures. Major supplier of freewheels and backstops, disc brakes, drum brakes, hydraulic brakes, shrink discs, shaft-hub connections, couplings, overload clutches and precision clamping fixtures.


A force for innovation, the company owes its leading position in France to the quality of the Group's products, the skills of its team of technical experts and its organisation focused on service and availability. Certificat ISO 9001:2015.

SIAM RINGSPANN is developing an active, personalised partnership with its manufacturer customers to provide innovative, sustainable solutions tailored to Industry 4.0.

Contact us




23 rue Saint-Simon

69009 Lyon


+33 478 83 59 01




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