410J12 Poly-V rib belt. 12 Ribs. 41ā (1041mm) O.C. - PJ1041 Metric belt. āJā Series Poly-V (Micro V) ribbed belts are designed to replace OEM belts on extra heavy-duty applications such as 410J12 sander/planer belts, compressor belts, 410J12 (12-Rib PJ1041) fitness drive belts, and electric motor drive belts. AKA: J12-200 Belt.