We can supply all kinds of Thrust Ball Bearings: Series Item NO. Bore Diameter(mm) 51100 51100~51148 10~240 51200 51200~51250 10~250 51300 51305~51344 25~220 51400 51404~51436 25~180 52200 52202~52244 15~220 52300 52305~52340 25~200 52400 52405~52436 25~180 2900 2900~2918 10~90 Inch & Non-standard 9.525~254.00 (3/8"~10") REMARKS: The serieses of 51200,51300,51400,52200,52300 and 52400 can be divided into the Plain type, the Align typeand the Housing type.