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Technical specifications: Material: Aluminum alloy hubs and elastomeric polyurethane spider Product Type: Clamp style jaw coupling without keyway Dimensions: large bore: 8mm(5/16 inch), small bore: 5mm(13/64 inch), outer diameter: 25mm(63/64 inch), overall length: 30mm(1-3/16 inch) Cap Screw: M3-4 Nuber of Screws: 2 ea Angular Misalignment: ≤ 1° Parallel Misalignment: +0.20mm/-0.20mm Rated Torque: 2.0Nm Maximum Torque: 5.0Nm Maximun Rotatonal Speed: 6500RPM Application: It is mainly applicable for motors, stepper motors, encoders and serco machines. Notes Note 1: Performance ratings are for guidance only. The user must determine suitability for a particular application. Note 2: Torque ratings for the couplings are based on the physical limitations/failure point of the spiders. Under normal/typical conditions the hubs are capable of holding up to the rated torque of the machined beams. In some cases, especially when the smallest standard bores are used or where shafts are undersized, slippage on the shaft is possible below the nominal torque of the spiders.