A range of torsionally couplings are available from the extensive couplings range at sai the backlash free couplings offer power transmission with torsional vabration damping, advantages of this couplings are that they have axial plug-in,are easy to assemble, are maintenance free and have compensation of shaft misalignment- axial ,radial and angular. The basic range is available with either blank or finish borese according to iso fit H7 and keyways can be added to bored couplings for no extra cost , hubs are either steel, aluminium or castiron depending on sizes chousen and polyurethane spider elements is to 92 shore A as standard with other