SF Bushing

QTL TAPER BUSHINGS Cast Iron - Made in China "SF" Style Bushing	The suffix letter on the pulley number indicates the bushing style required. Example: 6-3V1060-SF (requires a SF bushing)
Resource: Click here for easy to use pulley lookup web guide
Type and load-bearing capacity A bushing's load-bearing capacity is related with tightening torque and shaft size and the load-bearing capacity increases as the shaft size enlarges. IMPORTANT: Screws must be tightened evenly. Over tightening the screws may cause the hub or sheave to crack.