Aluminum Alloy Coupler Sourcing Map 4mm To 4mm Aluminum Alloy Shaft Coupling Motor Connector For Encoders For little torque shaft connect. Wide Range of Applications: Whether you need to connect motors, pumps, generators, or other rotating equipment, this aluminium alloy shaft coupling provides a reliable connection for efficient power transmission Absorption of parallel, angular misalignments and shaft end-play by spring action. Package Content - 5pcs Shaft Coupler Diameter 4mm To 10mm, Come With A Key Wrench For Convenient Use. Coupler Size · View More Details Zero backlash. Material: Aluminum alloy; Connection Diameter: 4mm to 6mm; Total Length: 25mm /0., 98 inch; Outside Diameter : 19mm/ 0., 75 inch , Zero backlash. Widely used in drive systems for encoders, instrumentation,lead screws, small pumps, feed rollers and anywhere light to medium duty, torsionally flexible coupling is required.