Full definition
V-belt with a symmetrical trapezoidal profile on both top and bottom faces, enabling power transmission from either side. Designed for serpentine (multi-pulley) drives where the belt must wrap around pulleys in alternating directions (reverse bending). Standard profiles per RMA: AA (13 mm), BB (17 mm), CC (22 mm). Also designated HAA, HBB, HCC in some catalogs. Cross-section is approximately hexagonal. Used in agricultural machinery (combines, balers), textile looms, and complex multi-shaft industrial drives. Brands: Gates Tri-Power, Optibelt DK, Continental. Belt length measured at neutral line.