The coupling connects the drive pin of the axis to the motor pin. An elastic polymer insert, in the centre of the coupling transfers the motor torque. This dampening element compensates for radial and axial clearance.
 
Type code (not configurable, serves only for explanation))
Part number: COU-AR-K-050-000-25-26-B-AAAB
 
1st place (COU): Product type
2nd place (AR): igus internal
3rd place (K): Product definition
4th place (050): Hole diameter 1/d1/Motor
5th place (000): Hole diameter 2/d2/axis
6th place (25): Coupling outer diameter
7th place (26): Coupling length
8th place (B): Coupling inner ring
9th place (AAAB): Hole type (AAAA = round, AAAB = square)