Caterpillar-style premium aftermarket track-shoe bolt. Part reference 372-3875. Size/application: Track Bolt 1 1/8 – 7 D10R D10T2 D10 D10T. Corresponding track nut reference: 2J3507. High-strength undercarriage fastener for the specified track-shoe assembly. Brand compatibility: Caterpillar and premium aftermarket systems built to the matching Caterpillar specification. Match thread, shank length and machine model before installation.