Coupling Answers | Where the World Turns for Coupling Knowledge: Should I rotate shaft keyways 180° apart when installing a coupling?
Metal MRC-15-KW 15mm ID Rigid Steel w/key Shaft Coupling
Hot Sale High Precision Aluminum Couplings Keyed Shaft Coupling Types of Shaft - China Customized Part for Home Furniture, Shaft for Sofa | Made-in-China.com