C2318K/C4 - SKF CARB Toroidal Roller Bearing - 90x190x64mm N319-EC-M a surface hardened stamped steel

a surface hardened stamped steel cage and a standard radial internal clearance

N 2 08 E M1 Two Flanges On Inner Ring and No Flanges On Outer Ring Light Series 40mm - Bore Size Increased Capacity Design Solid Brass Cage

nu 10 18 Single row cylindrical roller with no flanges on inner ring Extra Light Series 90mm - Bore Size Steel Cage Normal Internal Clearance

The NUP209ECJ/C3 SKF bearing features a cylindrical roller design

C2318K/C4 - SKF CARB Toroidal Roller Bearing - 90x190x64mm N319-EC-M a surface hardened stamped steelc23 18 k c4 CARB Toroidal Roller Bearings 90mm Bore Size Tapered Bore Stamped Steel Cage Internal Clearance Greater than C3