Hole-drilling self-tapping screw

Details Hole-drilling self-tapping screw Hole-drilling self-tapping screw

1978-01-17

1981-03-24

Bonck, Rodney H.

Expanded, threaded, driven, headed, tool-deformed, or locked-thr

Externally threaded fastener element, e.g., bolt, screw, etc.

Pilot end having means enhancing fastening or installation

408228, 408231, F16B 2500

Patent

active

042573076

ABSTRACT:
A self-tapping screw whose stainless steel shank has a slotted free end in which a plate-shaped, carbide drill bit is fastened, the bit being dimensioned and arranged to drill a hole smaller than the major diameter of the tapping threads.

REFERENCES:
patent: 1104987 (1914-07-01), Grimes
patent: 1327566 (1920-01-01), Morris
patent: 2266892 (1941-12-01), Mullen
patent: 2364733 (1944-12-01), McCollum
patent: 2627292 (1953-02-01), Kronwall
patent: 3699841 (1972-10-01), Lanius
patent: 3715952 (1973-02-01), Fischer
patent: 3718067 (1973-02-01), Fischer
patent: 3924508 (1975-12-01), De Caro
patent: 4016795 (1977-04-01), Gill
patent: 4022099 (1977-05-01), Ballantyne

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