Starrett gauge, .228-.040”, tap and drill

Description

Highly useful gauge shows at a glance the correct size tap drill for any common size machine screw tap in “National Fine” or “National Coarse” Thread Series, that will leave the right amount of stock for approximately 65% full thread. The gage also show correct body size drill to use. There are 60 holes marked with no. size and decimal equivalent of the drill that fits each hole. This gage has a black matte finish with information steel stamped on one side and white marked on the reverse side for quick, clear reading. The gage is thoroughly tested for accuracy after hardening. 5/64″ T x 2.5/16″ W x 6.1/4″ L