Self-tapping screw

Details Self-tapping screw Self-tapping screw

1977-12-06

1979-07-17

Holko, Thomas J.

F16B 2500, F16B 3302

Patent

active

041611322

ABSTRACT:
A self-tapping screw, particularly for use in hard materials, such as bricks, concrete and rock, having a screw thread comprising a plurality of circumferentially successive thread portions between which there are voids, wherein at least the front end of each such thread portion is smoothly rounded from the central essentially cylindrical core portion of the screw and rearwardly toward the apex of the screw thread portion.

REFERENCES:
patent: 1088892 (1914-03-01), Foreman
patent: 2703419 (1955-03-01), Barth
patent: 3200691 (1965-08-01), Neuschotz
patent: 3209383 (1965-10-01), Carlson
patent: 3362281 (1968-01-01), Finlay

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