1. Product Overview X-133400D single-row non-standard thin-wall deep groove ball bearing. Suffix D stands for reinforced internal anti-deformation optimized structure, with enhanced rigidity under frequent alternating micro torque load. Fully interchangeable with NSK X-133400D, customized for miniature hydraulic valve control shafts inside Asian passenger car automatic transmissions.Three seal configurations available: Open type, ZZ metal shield, 2RS double rubber seal.