Rigid Coupling: for aligned shafts
1)Sleeve or Muff Coupling
2)Clamp or Split Muff / Compression Coupling
3)Flange Coupling : (a) Unprotected type, (b) Protected type

Flexible Coupling: for non-aligned shafts
1)Bush Pin type Flange coupling
2)Oldham’s Coupling
3)Universal Coupling or Hooke’s Joint