Pin for a fastener and method of making same

C - Chemistry – Metallurgy – 21 – D

Patent

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C21D 9/00 (2006.01) F16B 19/05 (2006.01)

Patent

CA 1287758

P.309 ABSTRACT A headed steel pin (10) for a multi-grip fastener of the pin and swageable collar (12) 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 (10) having a plurality of identical, regularly spaced, annular, combination grooves (22) each able to function alternatively as a locking groove, a pulling groove, or a breaker groove. The shaped pin (10) is heat treated, the steel being 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 (10) 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 (22) when the fastener is installed in a workpiece (60, 62).

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