STS zero backlash free couplings and reducer for torque transmission combined with high torsional stiffness, low moment of inertia and compensation for radial, axial and angular misalignment. Caters to torque capacity from 0. 4 nm to 5000 nm with bore diameters from 3mm to 85 mm in divergent models, including plain bore/key way, side and top clamping, internal and external conical hubs. Hubs are of aluminum & steel (based on torque) while the central flexible element is of stainless steel to transmit power and provide flexibility. Specials (on request) are also designed to suit individual requirements. STS gmbh, a new comer to direct marketing has been the main sub-contractor for the past decade or so to a leading and reputed coupling manufacturer. Successfully working in varied applications, all over the country. STS also manufactures the entire range of servo-insert couplings, magnetic couplings and safety couplings.