4 mm x 9 mm x 4 mm SKF W638/4-2Z deep groove ball bearings

4 mm x 9 mm x 4 mm SKF W638/4-2Z deep groove ball bearings SEARCH - Whether it's agriculture or construction equipment your working on, SKF Wheel Bearings DEVELOP MFG.CORP. Has the4x9x4 Bearing 4 mm x 9 mm x 4 mm you need.

What is W638/4-2Z bearing cross reference？