The Effect of Coating and Tightening Speed on the Torque-Tension Relationship in Threaded Fasteners 2006-01-1252
This study investigates the effect of fastener coating, tightening speed, and repeated tightening on the torque-tension relationship, and on the coefficients of thread and underhead friction. Selected coatings provide three distinctly different levels of friction between threads and under the rotating fastener head; these coatings are assigned a low, medium, or high friction designation. Due to the fact that the torque-tension relationship is highly sensitive to normal variations in friction, the findings of this study would improve the reliability and safety of bolted assemblies, especially in critical applications.
For the three selected coatings, the experimental procedure determines the coefficients of thread and underhead bearing friction as well as the overall fasteners torque-tension relationship at two tightening speeds for three fastener sizes with fine and coarse threads. Additionally, the effect of repeated tightening is examined.
Citation: Nassar, S., Sun, T., and Zou, Q., "The Effect of Coating and Tightening Speed on the Torque-Tension Relationship in Threaded Fasteners," SAE Technical Paper 2006-01-1252, 2006, https://doi.org/10.4271/2006-01-1252. Download Citation
Author(s):
Sayed A. Nassar, Tianshu Sun, Qian (Beth) Zou
Affiliated:
Fastening and Joining Research Institute (FAJRI), Oakland University
Pages: 18
Event:
SAE 2006 World Congress & Exhibition
ISSN:
0148-7191
e-ISSN:
2688-3627
Also in:
Experiments in Automotive Engineering - Experimental Test-SP-2033
Related Topics:
Fasteners
Coatings, colorants, and finishes
Fibers
Fastening
Bearings
Reliability
SAE MOBILUS
Subscribers can view annotate, and download all of SAE's content.
Learn More »
