Elastomer (Centaflex)
Torsionally soft, absorbs shock, ideal for diesel-engine drives and reciprocating compressors.
Disc / lamina
Torsionally stiff, low-maintenance, ideal for pumps and turbines.
Gear
High torque density, accepts misalignment, needs lubrication.
Bellows / beam (R+W)
Backlash-free, used for servo drives, encoders and metrology.
Torque-limiting (R+W safety)
Ball-detent or friction couplings that release at a set torque to protect downstream equipment.