90 mm x 190 mm x 43 mm NKE 6318-RSR deep groove ball bearings

LET SKF Wheel Bearings DEVELOP MFG.CORP. OUR 90 mm x 190 mm x 43 mm 90 mm x 190 mm x 43 mm NKE 6318-RSR deep groove ball bearings EXPERTS Metric Inch - Metric GET YOU THE PARTS YOU NEED.

What is 6318-RSR bearing cross reference？