1. Product Overview T451-902A1 belongs to TTHD series single direction thrust tapered roller bearing, standard inch metric dual dimension 114.3mm inner bore × 250.825mm outer diameter × 53.975mm total width, heavy-duty one-way axial thrust bearing specially developed for heavy industrial equipment.Model Code Explanation: T451: Basic base model of thrust tapered roller bearing 902A1: Complete assembly part number including shaft washer, brass cage and tapered roller set TTHD: