1. Product Overview B18Z-1B1 non-standard single-row open deep groove ball bearing, dimension 18.7mm inner × 38mm outer × 10mm narrow width. Suffix Z stands for ultra-smooth superfinished raceway, suffix 1B1 represents matched precision structural design. Fully interchangeable with original NSK B18Z-1B1, specially used for Asian passenger car steering column assembly. Open design without rubber sealing lips, stamped low-carbon steel cage, standard C0 clearance, C3 clearance