XL=X-Life. C3=Internal Clearance Larger Than Normal. 2S=If Two Or More Bearings Are Located Adjacent To Each Other In A Planet (2, 3 Or 4 Bearings), These Must Be Ordered Using The Suffix 2S, 3S Or 4S So That They Are Sorted Together.
Inner (d) Inch
Outer (D) Inch
Width (B) Inch
Description from Medias
Needle roller bearings NA49, dimension series 49, to DIN 617/ISO 1206