Method of making threaded fasteners

Details Method of making threaded fasteners Method of making threaded fasteners

1989-06-30

1990-07-17

Combs, E. Michael

Metal deforming

By use of tool acting during relative rotation between tool...

During rotation of work

10 27R, B21H 302, B21K 146, B21K 156

Patent

active

049413376

ABSTRACT:
A threaded fastener is made by a method which involves forming a portion having an external thread form and a shank portion. The shank portion has at least one substantially circumferential groove the depth of which is such that the effective stress area thereby produced is less than the minimum effective stress area of the external thread form and is also such that yield of the threaded fastener occurs in use in the region of the or each groove at a predetermined load. The depth of the or each groove may be such that the diameter of the shank portion at the base of the or each groove is in accordance with the relationship: ##EQU1## where D is the diameter at the base of the or each groove (m)

REFERENCES:
patent: 2895368 (1959-07-01), Place
patent: 3966341 (1976-06-01), Bailey et al.
patent: 4018132 (1977-04-01), Abe
patent: 4338054 (1982-07-01), Dahl
patent: 4786226 (1988-11-01), Jende

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