220 mm x 300 mm x 18.5 mm SKF 81244 M Thrust roller bearing

Thrust Roller Bearing offers a 220 mm x 300 mm x 18.5 mm SKF 81244 M Thrust roller bearing selection of Genuine SNW 38x6.13/16 Adapter sleeve assembly 34.925 mm N1 Thrust Roller Bearing at Wholesale Prices. Jinan Shenglei Bearing Co., Ltd. We are a 220 mm x 300 mm x 18.5 mm SKF 81244 M Thrust roller bearing Certified Parts Retailer

What is bearing cross reference？