Chain Coupling Sprocket Chain Number 40 Bore Diameter 7/8 in Bore Type Round Keyed Horsepower @ 100 RPM 4.14 hp Outside Diameter with Chain 3 in Hub Diameter 1 3/8 in For Chain Pitch 1/2 in Keyway Depth 3/32 in Keyway Width 3/16 in Maximum Angular Misalignment 1 Degrees Number of Teeth 16 Parallel Misalignment 0.005 in System of Measurement Inch Axial Motion 0.06 in For Cover Part Number AL40 Horsepower @ Maximum RPM 16.9 hp @ 4 000 RPM