180 mm x 250 mm x 21 mm NSK 54236X thrust ball bearings

We 180 mm x 250 mm x 21 mm Single Row Number of Rows of Balls Provide Extensive 180 mm x 250 mm x 21 mm NSK 54236X thrust ball bearings NTN BEARING CORP.OF AMERICA Selection And Competitive Wholesale Pricing.

What is 54236X bearing cross reference？