| 摘要 |
Disclosed herein is a self-tapping screw having a drill tip for boring an opening in a work piece, wherein the drill tip comprises an axial section of cone attached at its base portion to the shank of the screw. The conical section has a cutting edge along a conical surface thereof, such cutting edge being disposed in a plane which includes the axis of the screw shank, and a chute extending from a position adjacent the cutting edge to a position at the screw shank so that chips of the workpiece are carried out of the bored opening along the path of the chute.
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