Variable Pitch V-Belt Pulley Bore Diameter 1 1/8 in For Belt Trade Size 3L 4L 5L A AX B BX For V-Belt Type Classical Cogged Material Cast Iron Maximum Pitch Diameter 3.5 in (3L) 3.8 in (4L A) 4.1 in (5L B) Number of Grooves 1 Outside Diameter 4.15 in 3L Pitch Diameter (Maximum) 3.5 in 3L Pitch Diameter (Minimum) 2.7 in 3V Pitch Diameter (Maximum) Not Applicable 3V Pitch Diameter (Minimum) Not Applicable 3VX Pitch Diameter (Maximum) Not Applicable