Bolt having spherically tipped thread free cylindrical column

Details Bolt having spherically tipped thread free cylindrical column Bolt having spherically tipped thread free cylindrical column

1991-11-29

1993-05-11

Wilson, Neill R.

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

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

Pilot end having means enhancing fastening or installation

411424, F16B 2500

Patent

active

052096220

ABSTRACT:
Disclosed is a bolt which comprises a short column portion formed at the extreme end of the thread portion thereof, wherein the short column portion has a diameter larger than the root diameter of the thread portion and smaller than the thread diameter thereof and the extreme end thereof is formed to a spherical portion and a method of manufacturing the bolt by which a thread portion and a spherical surface portion are simultaneously rolled. The bolt arranged as described above has an excellent guide property to a nut.

REFERENCES:
patent: 3156152 (1964-11-01), Reed
patent: 4232497 (1980-11-01), Meschnig
patent: 4261402 (1981-04-01), Stanaitis

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