Bearing model number:R4zz R4 2rs Bearing size: inner diameter 6.35mm * outer diameter 15.875mm * thickness 4.978mm Bearing materials and characteristics: chrome steel / GCr15 (fully hardened type), double-sided steel shielding layer (ZZ) or double-sided rubber seal (2RS/2RZ), both inner and outer rings are finely ground, capable of high-speed operation and low noise ,stable quality and durable. |