90 mm x 190 mm x 43 mm NACHI 6318Z deep groove ball bearings

90x190x43 Bearing offers a 90 mm x 190 mm x 43 mm 90 mm x 190 mm x 43 mm NACHI 6318Z deep groove ball bearings selection SKF Wheel Bearings DEVELOP MFG.CORP. of Genuine 90x190x43 Bearing at Wholesale Prices. We are a 90 mm x 190 mm x 43 mm NACHI 6318Z deep groove ball bearings Certified Parts Retailer

What is 6318Z bearing cross reference？