Screw fastener blank

Details Screw fastener blank Screw fastener blank

1987-10-19

1989-03-28

Zimmerman, John J.

Stock material or miscellaneous articles

All metal or with adjacent metals

Intermediate article

428577, 428583, F16B 3500

Patent

active

048163465

ABSTRACT:
A bi-metallic screw fastener blank for a self drilling screw of a given root diameter is disclosed. The screw blank comprises a metallic head and shank member made of a first material that is welded to a metallic slug member that is of equal diameter to the head and shank member but is made of a second material which is heat hardenable. The blank is characterized by an annular groove at the weld interface between the head and shank member and the slug member that has a diameter equal to the given root diameter of the screw.

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patent: 3924508 (1975-12-01), DeCaro
patent: 4003175 (1977-01-01), Patry

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