Drilling and tapping screw

Details Drilling and tapping screw Drilling and tapping screw

F - Mech Eng,Light,Heat,Weapons

16

B

85/107

F16B 25/00 (2006.01) F16B 25/10 (2006.01)

Patent

CA 1096209

TITLE OF THE INVENTION DRILLING AND TAPPING SCREW ABSTRACT OF THE DISCLOSURE A screw having drilling, tapping and fastening functions at the same time comprises a slender shank having a tool receiving head formed at the rear end of the shank, a drill portion integral with the front end of the shank and a helical cutting screw thread on the outer periphery of the shank. The drill portion is flat or platelike in cross section and is tapered toward its tip to provide a pair of sharp drilling edges. A pair of ribs extending longitudinally of the shank are formed on the opposite long side portions of the drill portion in symmetrical arrangement. The ribs prevent break of the drill portion during cutting while permitting smooth removal of chips.

317121

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