Northfield Precision Instrument Corp. introduces its Model 627-W 6" diameter chuck. This chuck, with .0001 T.I.R., was designed to grip hole saw blanks for turning and tapping. The chuck is a coolant/air blast through, 2-jaw air chuck with a 1" dia. Counter bore for tap clearance.

Special sub-jaws with 2 "Bullet" nosed pins grip the blanks between 2 holes. The jaws are approximately ¾;" wide to fit between 2 hardened and ground full circle segments mounted to the chuck face to support the work piece during machining.