A Study of Anti-Loosening Ability of 5/8 BSW Fasteners under Vibration with High Tension Steel and Stainless Steel Bolts

摘要

Threaded fasteners have been popularly utilized for temporary joining of machine elements due to the feature that they provide high clamping force and torque using a simple tool. However, they have the problem of loosening under vibrating conditions which leads to loss of clamping force, and finally failure of the system. In the present experimental work, anti-loosening ability of various fastening elements, such as conventional nut, nylock nut, flat washer, spring washer, inside and outside serrated washer, are tested with conventional 5/8" BSW High Tension Steel (HTS) and Stainless Steel (SS) bolts. The concept of hybrid double nut using a conventional nut and one nylock nut at the outside, and adhesive bonded nut with conventional 5/8" BSW (both HTS and SS) bolt is also tested to obtain enough resistance to loosening. On the basis of the experimental results, hybrid double nut and adhesive bonded nut can be recommended for both HTS and SS 5/8" BSW bolts to apply under vibration conditions, as they resist loss of clamping force effectively.