Self-tapping or thread-forming screw

Details Self-tapping or thread-forming screw Self-tapping or thread-forming screw

1976-09-14

1978-08-01

Hunt, Brooks H.

Stock material or miscellaneous articles

All metal or with adjacent metals

Intermediate article

428583, 428584, 85 47, 85 48, B21H 302, B21H 310

Patent

active

041044460

ABSTRACT:
An improved self-tapping or thread-forming screw where the thread configuration on the screw end swages or forms the thread in an object to be threaded rather than cutting and removing a portion of the material of the object. The screw is provided with a threaded shank terminating in a tapered thread-forming end having four equi-spaced flattened surfaces separated by four threaded lobes or corners, and each corner is provided with a leading flattened surface in place of a portion of the radius to provide a partially threaded relief area in addition to the full relief areas formed by the flattened sides.

REFERENCES:
patent: 2703419 (1955-03-01), Barth
patent: 3218905 (1965-11-01), Reiland
patent: 3530760 (1970-09-01), Lindstrom

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