900 mm x 1 420 mm x 412 mm NTN 231/900B Spherical Roller Bearings

Spherical Roller Bearings offers a 900 mm x 1 420 mm x 412 mm NTN 231/900B Spherical Roller Bearings FYKK Bearing Industrial Limited selection of Genuine 280mm d Spherical Roller Bearings at Wholesale 590 Limiting Speed Rating (r/min): Prices. We are a 900 mm x 1 420 mm x 412 mm NTN 231/900B Spherical Roller Bearings Certified Parts Retailer 900 mm x 1 420 mm x 412 mm

What is 231/900B bearing interchange？