Martin BK140-H FHP Sheave, MST Bushed, 4L/5L or B Belt Section, 1 Groove, 1-5/8" Bore, Class 30 Gray Cast Iron, 13.75" OD, 1804 max rpm, 13 Datum/13.4 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 4L/5L or B belt or cross section One groove for single belt use