Self-drilling, self-tapping fastener

Details Self-drilling, self-tapping fastener Self-drilling, self-tapping fastener

1982-05-03

1987-09-15

Gall, Lloyd A.

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

408224, F16B 2500

Patent

active

046936548

ABSTRACT:
A self-drilling, self-tapping screw has a drill tip formed by a pair of conical segments. Each segment has a flat side and a rounded tip with one segment being longitudinally offset with respect to the other. The shorter, offset segment may have a greater included angle. At least a portion of the flat side of the second segment is coplanar with the flatside of the first segment. The screw preferably includes a quad-lead thread having two crests with a first diameter and two crests with a second larger diameter.

REFERENCES:
patent: 2174578 (1939-10-01), Graham
patent: 2562516 (1951-07-01), Williams
patent: 3093028 (1963-06-01), Mathie
patent: 3207023 (1965-09-01), Knohl
patent: 3207024 (1965-09-01), Sommer
patent: 3221588 (1965-12-01), Wieber
patent: 3438299 (1969-04-01), Gotshall
patent: 3682038 (1972-08-01), Lejdegard
patent: 3710676 (1973-01-01), Ringland
patent: 3724315 (1973-04-01), Sybnator
patent: 3942405 (1976-03-01), Wagner
patent: 4222689 (1980-09-01), Fujiwara

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