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The Effectiveness of Non-Loosening Fasteners

[+] Author Affiliations
Yasumasa Shoji

YS Corporation LLC, Musashino, Japan

Paper No. PVP2017-65291, pp. V002T02A022; 6 pages
  • ASME 2017 Pressure Vessels and Piping Conference
  • Volume 2: Computer Technology and Bolted Joints
  • Waikoloa, Hawaii, USA, July 16–20, 2017
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 978-0-7918-5793-9
  • Copyright © 2017 by ASME


Many people know that bolted fasteners are loosened and they sometimes suffer from the loosening. It is also the case for any plants who have hundreds of thousands of bolts.

Any of these bolts may cause serious problems when they are loosened.

Many countermeasures are proposed to prevent bolt loosening, but few of them are really effective.

So far, only three bolting systems passed NAS 3350 tests. They are Eccentric nuts, based on nut eccentricity, Lock’n bolt, based on outer expansion of bolt threads, and L/R nut, whose principle is not open.

As L/R nut is unknown how it works, this paper addresses the effectiveness of the Eccentric nuts and Lock’n bolts and compare them in simulation.

The author have been working in bolt system loosening for a long time and succeeded the simulation of the phenomenon. This paper is the continuous work of this research.

Copyright © 2017 by ASME
Topics: Fasteners



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