Martin AK30-H FHP Sheave, MST Bushed, 3L/4L Belt Section, 1 Groove, 1-5/8" Bore, Class 30 Gray Cast Iron, 3.05" OD, 8134 max rpm, 2.46" Pitch Diameter/2.8 Datum Classical V-belt sheave fits widely available, classical profile V-belts suitable for use in many existing drive designs Class 30 gray cast iron for resistance to wear and galling 3L/4L or A belt or cross section One groove for single belt use