To provide a two-piece nut satisfying required torque specification even if fluctuation in tolerance exists between the nut and a bolt in the two-piece nut.
In a threaded fastener with the two-piece nut member and the bolt with the nut member having a threaded nut member and a base member, the threaded nut member has a body portion and a neck portion, the neck portion engaging with a transition beginning engagement on the base member. The base member includes a transition portion, the diameter of the transition portion increasing radially as it extends axially from a cylindrical through bore portion to an increased diameter at an outer planer surface of the base member. Movement of the neck portion into the based member results in the threaded form having a compressive engagement with engaged threads of the bolt to provide the prevailing torque structure. The threaded nut member and the base member may be made of dissimilar materials, and is more flexible in use with various bearing surfaces.
FIELDS WILLIAM O JR
MONTSERRAT ERNEST
SILVER DAVID
| JP2003156022A | 2003-05-30 | |||
| JPS61150513A | 1986-07-09 | |||
| JP2002195236A | 2002-07-10 | |||
| JP2001003915A | 2001-01-09 |
Kosaku Sugimura
Kiyoshi Kuruma
Shiro Fujitani
Tatsuya Sawada
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