Bolted assemblies with steel or aluminium hubs connecting through laminated steel flex packs. To connect two fixed shafts a double flexing design with two packs is needed. If one shaft is floating, a single flexing design is possible. Different models suit shafts from 4 to 150 mm, torques up to 9000Nm. Metal disc couplings are torsionally stiff, backlash free and maintenance free. Spacer versions up to 5m long are possible.