Polyurethane Spider Insert Coupling Size FC38 Outside Diameter 3 3/4 in System of Measurement Inch Maximum Speed 1 750 RPM Horsepower @ 100 RPM 4.30 hp Spider Material Polyurethane Maximum Torque 3 000 in-lb Parallel Misalignment 0.002 in Angular Misalignment 1 Degrees Color Tan Compatible Hub Manufacturer Part Number FC38 Fail Safe Yes For Misalignment Type Angular Parallel Horsepower @ RPM 45.8 hp @ 1150 RPM Maximum Operating Temperature 200 Degrees F