65 mm x 140 mm x 33 mm NKE 1313-K self aligning ball bearings

NKE Bearing offers a 65 mm x 140 mm x 33 mm NKE 1313-K self aligning ball bearings N/A Minimum Buy Quantity selection of Genuine 65 mm x 140 mm x 33 mm NKE Bearing at Wholesale Prices. We are a BEARING PRECISION AXLE CORP. 65 mm x 140 mm x 33 mm NKE 1313-K self aligning ball bearings Certified Parts Retailer

What is 1313-K bearing cross reference？