3/4" x 52mm x 21mm Ball Bearing - Sealed Outer Diameter - 3 9/16 inch (3.5625") the 6220NRBNLS outer diameter is

the 6220NRBNLS outer diameter is 180mm

6218 2RSJ EM inner diameter is 90mm

S6206ZZ high-temp stainless bearing

the 6240 outer diameter is 360mm

3/4" x 52mm x 21mm Ball Bearing - Sealed Outer Diameter - 3 9/16 inch (3.5625") the 6220NRBNLS outer diameter is3 4" x 52mm x 21mm Ball Bearing Sealed Deep Groove Chrome Steel Bearing This single bearing measures 3 4 inch (ID) x 52mm (OD) x 21mm (width), making it a handy fit for industrial machines, automation gear, and mechanical tools. Built from tough chrome steel, its sealed on both sides with rubber to help keep out dust and grime, so it lasts longer and rolls smoother. Deep groove design for steady operation Sealed with rubber on both sides for extra