Shaft Collar, System of Measurement Inch, Shaft Locking Type - Couplings 2 Piece Clamp, Bore Type - Collars Plain Bore, Bore Dia. 2 in, Material - Collars Stainless Steel, Outside Dia. 3 in, Width 11/16 in, Clearance Dia. 3.312 in, Screw Size 5/16 In.-24, Screw Material Stainless Steel, Operating Temp. Range -40 Degrees to 800 Degrees F