Patent ID: 9333564
Filing Date: 2016-05-10
CPC Classification: B23B,B23P,Y10T

Claim Text:
1. An elongated drill bit with a longitudinal axis comprising: a shank at a first end having a nominal diameter that is between 13/64 inch and ¼ inch, between 17/64 inch and 21/64 inch, or between 11/32 inch and ½ inch; a working end at a second end; a flute portion between the shank and the working end, with the shank, the working end and the flute portion continuous with one another, the flute portion including at least one flute at a helix angle of approximately 30° to 35°, the working end comprises a pilot tip with a first cutting portion and a second cutting portion axially spaced from the first cutting portion, at a terminus of the flute portion, and including a pair of cutting edges on opposing sides of the pilot tip; and a tapered web formed in the flute portion, where a thickness of the web at the tip of the working end is between 13% and 14% of the nominal diameter if the nominal diameter is between 13/64 inch and ¼ inch, is between 11% and 12% of the nominal diameter if the nominal diameter is between 17/64 inch and 21/64 inch, or is between 9% and 10% of the nominal diameter if the nominal diameter is between 11/32 inch and ½ inch.