Tightly controlled face to bore perpendicularity is maintained (TIR of
.Balanced Collar, 1pc Clamp, Balanced, Bore 34mm, Steel This two-piece shaft collar has a 34mm bore, 57mm OD, and 15mm width. It has a balanced design for better performance in high RPM applications. Ruland clamp style shaft collars do not mar the shaft, are infinitely adjustable, and have superior holding power when compared to set screw collars.