The WJ081210 is an imperial needle roller and cage assembly with a bore (inner) diameter of 1/2 inch (12.7 mm), an outside diameter of 3/4 inch (19.05 mm), and a width/height of 5/8 inch (15.875 mm). 
Dimensions Overview
  • Bore Diameter (d): 1/2 in (12.7 mm)
  • Outside Diameter (D): 3/4 in (19.05 mm)
  • Width (B): 5/8 in (15.875 mm