This one-piece shaft collar has a 42mm bore, 73mm OD, and 19mm width.
Shaft Collar,1pc Clamp,Bore 42mm,OD73mm,316 Stainless Steel,MCL-42-ST Tightly controlled face to bore perpendicularity is maintained (TIR of Ruland clamp style shaft collars do not mar the shaft, are infinitely adjustable, and have superior holding power when compared to set screw collars..