Jaw Coupling Hub, Coupling Size L050, Outside Diameter 1 5/64 in, Coupling Overall Length 1 23/32 in, System of Measurement Inch, Hub Material Carbon Steel, Maximum Speed 18,000 RPM, Horsepower @ 100 RPM 0.042 hp (Buna-N Spider), 0.06 hp (Urethane Spider), 0.08 hp (Hytrel Spider), Bore Diameter 1/4 in, Shaft Locking Type Set Screw, Bore Type Round Bore, Jaw Profile Straight, Compatible Center Element Manufacturer Part Number L050H, L050N, L050U, Screw Thread Size 1/4 In.-20 UNC Providing a reliable solution for uniform to heavy shock loads, this durable jaw coupling hub is directly interchangeable with industry standard couplings. It's designed for extreme conditions, and is ideal for use with variable-speed and variable-torque applications. No lubrication or maintenance is required.