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Title:
THREADED FASTENER, MANUFACTURING METHOD OF MALE THREADED FASTENER AND ROLLED DIES
Document Type and Number:
Japanese Patent JP2007132398
Kind Code:
A
Abstract:

To provide a threaded fastener capable of significantly improving maximum fastening torque and holding force which is unlikely to loosen, a manufacturing method of a male threaded fastener and rolled dies.

In the threaded fastener, a follow side flank angle β of the male screw part 5 or a female screw part is set to be zero or a negative angle or a positive angle not larger than one third of a lead angle or a positive angle not larger than 4°. In the case of manufacturing the male threaded fastener 1 of the threaded fastener with the male screw part 5, a blank is provided between a plurality of rolled dies of which follow side flank angle of a thread forming groove is set to be zero or a negative angle or a positive angle not larger than one third of the lead angle or a positive angle not larger than 4°, the blank is rolled between the rolled dies and a thread 8 of the male screw part 5 is formed by rolling.


Inventors:
NOJIGAWA TERUFUMI
Application Number:
JP2005324534A
Publication Date:
May 31, 2007
Filing Date:
November 09, 2005
Export Citation:
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Assignee:
CROWN SEIMITSU KOGYO KK
International Classes:
F16B33/02; B21H3/06
Attorney, Agent or Firm:
Izumi Omori



 
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