New formulas are developed for the torque-tension relationship, various torque components, and breakaway torque values in threaded fastener applications. The three-dimensional aspects of the lead helix and thread profile angles and the kinetic and static friction coefficients are all taken into account. Two scenarios of the contact pressure between threads and under the turning fastener head are considered, namely, uniformly distributed and linearly distributed contact pressure scenarios. The effect of thread pitch, lead helix and thread profile angles, friction coefficients, and fastener geometry is discussed. Results from the new formulas are compared with the approximate torque-tension relationship provided in the literature. A percentage difference analysis indicates that the new formulas provide a significant improvement that would enhance the reliability and safety of bolted connections, especially in critical applications.
Skip Nav Destination
Article navigation
November 2007
Research Papers
Novel Formulation of the Tightening and Breakaway Torque Components in Threaded Fasteners
Sayed A. Nassar,
Sayed A. Nassar
Fastening and Joining Research Institute, Department of Mechanical Engineering,
Oakland University
, Rochester, MI 48309
Search for other works by this author on:
Xianjie Yang
Xianjie Yang
Fastening and Joining Research Institute, Department of Mechanical Engineering,
Oakland University
, Rochester, MI 48309
Search for other works by this author on:
Sayed A. Nassar
Fastening and Joining Research Institute, Department of Mechanical Engineering,
Oakland University
, Rochester, MI 48309
Xianjie Yang
Fastening and Joining Research Institute, Department of Mechanical Engineering,
Oakland University
, Rochester, MI 48309J. Pressure Vessel Technol. Nov 2007, 129(4): 653-663 (11 pages)
Published Online: September 12, 2006
Article history
Received:
December 10, 2005
Revised:
September 12, 2006
Citation
Nassar, S. A., and Yang, X. (September 12, 2006). "Novel Formulation of the Tightening and Breakaway Torque Components in Threaded Fasteners." ASME. J. Pressure Vessel Technol. November 2007; 129(4): 653–663. https://doi.org/10.1115/1.2767354
Download citation file:
Get Email Alerts
Lateral and Transverse Stiffness Requirements for Supports of Pipeline Systems Conveying Fluids
J. Pressure Vessel Technol
Evaluation of the Structural Suitability of Lifting Trunnions in Large Pressure Vessels
J. Pressure Vessel Technol (June 2025)
Related Articles
Thread Friction Torque in Bolted Joints
J. Pressure Vessel Technol (November,2005)
An Experimental Study of Bearing and Thread Friction in Fasteners
J. Tribol (April,2005)
Contact Mechanics Approach to Determine Effective Radius in Bolted Joints
J. Tribol (January,2005)
Related Proceedings Papers
Related Chapters
Materials
Design and Application of the Worm Gear
Understanding the Problem
Design and Application of the Worm Gear
Frictional Torque Transfer Behaviors of Friction Pads in Wet Clutch Engagement
Advances in Multidisciplinary Engineering