Stainless steel drill screw

Details Stainless steel drill screw Stainless steel drill screw

1978-07-20

1980-11-18

Britts, Ramon S.

Metal treatment

Stock

Ferrous

148 38, 148136, 408226, F16B 2500

Patent

active

042338808

ABSTRACT:
A drilling and tapping screw constructed from a 300 series stainless steel material which has the corrosive resistance of the high chromium high nickel content stainless steel while still being capable of drilling through carbon steel materials or the like. The product is constructed by forging the point at very slow forging speeds, resulting in a drill screw which is a predominantly martensitic structure at the drill point while predominantly austenitic in the shank and head regions.

REFERENCES:
patent: 3235378 (1966-02-01), Jennings
patent: 3241426 (1966-03-01), Gutshall
patent: 3253908 (1966-05-01), Tanczyn
patent: 3318182 (1967-05-01), Carlson
patent: 3957545 (1976-05-01), Mimino et al.
patent: 4022586 (1977-05-01), Espy
patent: 4039356 (1977-08-01), Schumacher et al.

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