' Shaft Collar, Standard, Clamp, Number of Pieces 2, 1-3/8 In. Bore Dia., Material Black Oxide Steel, Outside Dia. 2-1/4 In., Width 9/16 In., Clearance Dia. 2.500 In., Screw Size 1/4 In.-28, Screw Material Steel, Operating Temp. Range 0 Degrees to 300 Degrees F '