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On March 9th, the repaired shied main bearing with the largest size, heaviest weight, widest raceway width, highest accuracy and shortest processing period of the company was rolled off the production line in the Oversize bearing division and passed the user's acceptance. The technical requirements of face runout ≦0.12mm and radial runout ≦ 0.30mm after product assembly were met during processing, and the product was successfully assembled at one time and passed the user's on-site certification.