Patent ID: 6435782
Filing Date: 2002-08-20
Classification: B23B,B25B,Y10T

Abstract:
A tool for centering a drill or punch on the broken face of a large stud or bolt and for using the tool to break up and remove a large stud or bolt which comprises a collar having a central bore therethrough having a first portion threaded to mate with the stud or bolt threads and a second portion bored to just slide over the stud or bolt threads and an externally threaded cylindrical shaft which is threadably receivable in the collar, said threads being similar to those of the broken stud or bolt, the shaft having extending longitudinally therethrough a plurality of approximately symmetrically arrayed off-center holes, said holes being adapted to slidably receive an alignment pin or drill bit, said off-center holes being essentially equidistant from the center of the shaft and the inside of said external threads.