1. Product Overview X-134398.H single-row non-standard thin-wall deep groove ball bearing. Suffix H stands for high-temperature reinforced structure with optimized heat resistance and dimensional stability under sustained high oil temperature. Fully interchangeable with NSK X-134398.H, specially matched for miniature hydraulic valve control shafts inside Asian passenger car automatic transmissions.Three seal configurations available: Open type, ZZ metal shield, 2RS double