A New Tightening Technique for Threaded Fasteners

[+] Author and Article Information
M. Hagiwara

Department of Systems Engineering, Nagoya Institute of Technology, Nagoya 466, Japan

N. Ohashi

Department of Mechanical Engineering, Shonan Institute of Technology, Fujisawa 251, Japan

J. Offshore Mech. Arct. Eng 116(2), 64-69 (May 01, 1994) (6 pages) doi:10.1115/1.2920134 History: Received December 02, 1992; Revised February 08, 1994; Online June 12, 2008


A new technique for tightening threaded fasteners was proposed aiming to assure the quality and the reliability in the tightening operations. The technique is based on the torque difference and the relative rotation angle in tightening and loosening process, and no preliminary experiment is required. Repeated tightening (and loosening) experiments were performed for different types of lubricant to verify the applicability of this technique. Experimental results show that the preload provided to the joint can be estimated with high accuracy and precision by this technique, and the possibility to boost the reliability of tightening control is confirmed.

Copyright © 1994 by The American Society of Mechanical Engineers
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