Oil Impregnated Spider Insert Coupling Size FC15 Outside Diameter 1 1/4 in System of Measurement Inch Maximum Speed 1 750 RPM Horsepower @ 100 RPM 0.79 hp Spider Material Bost-Bronz Maximum Torque 500 in-lb Parallel Misalignment 0.001 in Angular Misalignment 0.5 Degrees Color Bronze Compatible Hub Manufacturer Part Number FC15 Fail Safe Yes For Misalignment Type Angular Parallel Horsepower @ RPM 9.1 hp @ 1150 RPM Maximum Operating Temperature 250 Degrees F