Shaft Collar, System of Measurement Inch, Shaft Locking Type - Couplings 1 Piece Set Screw, Bore Type - Collars Plain Bore, Bore Dia. 3/16 in, Material - Collars Stainless Steel, Outside Dia. 7/16 in, Width 1/4 in, Clearance Dia. 0.438 in, Screw Size #8-32, Screw Material Stainless Steel, Operating Temp. Range -40 Degrees to 800 Degrees F