Pin for a fastener, and method of making same

Details Pin for a fastener, and method of making same Pin for a fastener, and method of making same

1987-01-28

1988-01-05

Stallard, Wayland

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

Headed fastener element with nut, washer, securing means or cap

Deformable securing means

148 12B, 148 121, 148 124, C21D 900

Patent

active

047173009

ABSTRACT:
A headed steel pin for a multi-grip fastener of the pin and swageable collar type has a homogeneous microstructure, and consists substantially entirely of sorbitic tempered martensite. Suitable coarse-grained medium carbon steel is shaped to form a headed pin having a plurality of identical, regularly spaced, annular, combination grooves each able to function alternatively as a locking groove, a pulling groove, or a breaker groove. The shaped pin is heat treated, the steel rendered homogeneously martensitic and then tempered at a temperature approaching as closely as practicable to the lower critical temperature of the steel, to convert the martensitic steel entirely to sorbite. The finished pin has a suitable balance of brittleness, toughness, ductility and impact strength, and tends to break cleanly and reliably at a selected one of the combination grooves when the fastener is installed in a workpiece.

REFERENCES:
patent: 3344817 (1967-10-01), Connard
patent: 3532560 (1970-10-01), Tomioka et al.
patent: 4519736 (1985-05-01), Sigmund
patent: 4531871 (1985-07-01), Sigmund
patent: 4540447 (1985-09-01), Mercer
patent: 4584032 (1986-04-01), Isokawa
patent: 4653969 (1987-03-01), Summerlin

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