5 mm x 11 mm x 5 mm SKF W638/5-2Z deep groove ball bearings

SKF Bearing offers Crossville, TN - DC Manufacturing Plant Location a 5 mm x 11 mm x 5 mm SKF W638/5-2Z deep groove ball bearings selection of Genuine SKF Bearing at Wholesale Prices. Jinan LBR Bearing Co., Ltd. We are a 5 mm x 11 mm x 5 mm Baldor-Dodge Brand 5 mm x 11 mm x 5 mm SKF W638/5-2Z deep groove ball bearings Certified Parts Retailer

What is W638/5-2Z bearing cross reference？