Document Type and Number:
Japanese Patent JPS54124865
Kind Code:
U
Abstract:
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.
Application Number:
JP2125378U
Publication Date:
August 31, 1979
Filing Date:
February 20, 1978
Export Citation:
International Classes:
F16B25/10; (IPC1-7): F16B25/00; B23B51/02
Domestic Patent References:
| JPS46306A |