You searched for "parallel misalignment"
Ruland
Ruland Beam Coupling, 16mm Outside Diameter, 5mm Bore, 25.4mm Length Coupler
Part: FCMR16-6-5-A
Precision beam coupling for small equipment with misalignment compensation capability.
Ruland
Ruland Beam Coupling, 16mm Outside Diameter, 6mm Bore, 25.4mm Length Coupler
Part: FCMR16-6-6-A
Small flexible beam coupling for connecting rotating shafts with slight misalignment tolerance.