1.Product Overview B57Z-7A non-standard deep groove ball bearing, dimension 57.7×80×13mm, upgraded version of B57Z-7 for car automatic transmission auxiliary shafts. Double-sided stamped Z metal dust shields without rubber seals, matched stamped steel cage and C0 standard clearance. It bears radial load and minor bidirectional axial load, runs stably and low-noise under long-term high-speed shifting vibration. Made of fully quenched high-purity GCr15 chrome steel with tighter