Bando 60-S2M-326 326 inch long 6 inch wide 1.31 inch high Timing Belt with 163 teeth Unique modified curvilinear tooth form enables the STS belt to transmit greater loads than like-sized drives having the standard HTD profile. Smoother tooth engagement and direct contact of belt tooth top with the pulley grooves enables the belt to run quietly even at high speeds. As the tooth meshes with the pulley grooves, the cord lay forms an almost true circle, minimizing the cantilever effect on the cords. Results in reduced bending fatigue and longer service life. No lubrication or re-tensioning required.