Union Butterfield 470225/32 counterbore body, 25/32", 3 flutes. Part number 6210048. Counterbore body for use with interchangeable pilots.

Interchangeable pilot-counterbore body with 3-flutes, diameter 25/32" with an overall length of 5.3/8" and a flute length of 1.1/2" and 5/8" straight shank, according to ANSI standard to produce a flat bottom seat for socket-head cap screws with the aid of a pilot with a shank diameter of 1/4" and a maximum pilot guide diameter of 23/32", HSS with standard bright finish for machining free machining and plain carbon steel, wrought and copper or copper alloys.