STUDY ON LOOSENING TORQUE OF THREADLOCKED BONDS

One of the most important parameters of threadlocked bonds is loosening torque, which is a result of complex, time dependent chemical and physical, static and dynamical processes. Compliance of a threadlocker for a certain technical solution basically depends on it. In this paper we demonstrate results of experimental investigations on widely used threadlockers: Loctite 2400, 2700 and AJett 126.Loosening torque as function of curing time was measured on 8.8 galvanized steel screrws with three different threadlocker. Comprehension between thread surface cleaning, thread size, curing time and strength of thread bond was studied. It can be concluded that sensitivity of threadlockers for prior decontamination show significant difference, furthermore environmentally conscious materials saves costs of treatment, but may cause longer curing time, so deeper quantitative understanding of their functioning is needed for a competitive production design and optimization.