Oct 06, 2009 · Designed as high torque, tight space drives, Bison Gear's new FlexTorq™ 762 series hollow shaft offset AC gearmotors feature either a 1.25" (31.75 mm) I.D. hollow shaft or a 1.25" diameter solid shaft in either the u-shaped or s-shaped configuration. Driven by 1/20, 1/4, or 1/2 hp (37, 186, or 373 W) single and three phase 115 and 230 volt AC