Fastening element

Details Fastening element Fastening element

2008-09-03

2010-11-02

Estremsky, Gary (Department: 3677)

Expanded, threaded, driven, headed, tool-deformed, or locked-thr

Externally threaded fastener element, e.g., bolt, screw, etc.

Thread or shank structure

C411S487000, C411S914000, C411S901000, C470S017000

Reexamination Certificate

active

07824142

ABSTRACT:
A fastening element has a core zone (14) formed of a relatively hard carbon steel, a skin zone (17) located outwardly of the core zone (14) and formed of a first low-carbon austenitic steel alloyed with a first alloy metal, and an intermediate zone (15a, 15b) provided between the core zone (14) and the skin zone (17) and formed of a second low-carbon steel having a smaller hardness than the steel the core zone (14) is formed of.

REFERENCES:
patent: 3884116 (1975-05-01), Hage
patent: 4802807 (1989-02-01), Offenburger et al.
patent: 5417776 (1995-05-01), Yoshino et al.

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