Shaft Collar, System of Measurement Inch, Shaft Locking Type - Couplings 2 Piece Clamp, Bore Type - Collars Plain Bore, Bore Dia. 1 3/8 in, Material - Collars Stainless Steel, Outside Dia. 2 1/4 in, Width 9/16 in, Clearance Dia. 2.5 in, Screw Size 1/4 In. -28, Screw Material Stainless Steel, Operating Temp. Range -40 Degrees to 800 Degrees F