Variable Pitch V-Belt Pulley Bore Diameter 5/8 in Standards ISO 9001 2008 For Belt Trade Size 3L 4L 5L A AX B BX For V-Belt Type Classical Cogged Material Cast Iron Maximum Pitch Diameter 3.90 in (3L) 4.3 in (4L A AX) 4.4 in (5L B BX) Number of Grooves 1 Outside Diameter 4 in Set Screw Location 180 Degrees from Keyway 90 Degrees Apart 3L Pitch Diameter (Maximum) 3.9 in 3L Pitch Diameter (Minimum) 3.1 in 4L Pitch Diameter (Maximum) 4.3 in