40 mm x 90 mm x 23 mm KOYO 1308K self aligning ball bearings

The online Nylon Retainer Material 40 mm x 90 mm x 23 mm KOYO 1308K self aligning ball bearings parts store gives SKF BEARING LTD. you immediate access to a selection of more than 1.4 40 mm x 90 mm x 23 mm million new, Nickel-Coated Steel Bearing Insert Material used, remanufactured.

What is 1308K bearing cross reference？