What are the methods for preventing fasteners from loosening?
Using mechanical fasteners to fix and tighten threaded parts to connected parts or threaded parts to threaded parts
Publish Time:
2025-03-31
1. Non-removable anti-loosening
Using mechanical fasteners to fix and tighten threaded parts to connected parts or threaded parts to threaded parts to prevent loosening. The advantage of this method is its reliable anti-loosening, generally depending on the static or fatigue strength of the mechanical fastener (or the fastener itself, such as a slotted nut). Its disadvantages are increased weight of the fastening connection, manufacturing and installation difficulties, inability for motorized installation, and therefore higher cost. Due to its high anti-loosening reliability, it is still widely used in certain important parts of mechanical products and aerospace products. - Glue screws
Bolt (or screw) head and nut end face punch riveting: After tightening, the bolt (or screw) nut is locally deformed by punch riveting to prevent mutual loosening.
Locking adhesive bonding: Applying epoxy resin or anaerobic adhesive to the mating threaded surfaces. After the adhesive cures, it firmly bonds the mating threads, achieving the purpose of locking and anti-loosening. Different adhesives often have different locking capabilities. Fasteners coated with epoxy resin have very high bonding strength and are non-removable. Although fasteners coated with anaerobic adhesive are removable, the adhesive residue on the threaded surface is difficult to clean after removal, and the threads may be damaged, making the fasteners unsuitable for reuse.
Adhesives can also be used as sealing materials for threads, but they cannot withstand high temperatures.
2. Anti-loosening by increasing friction
Using the method of increasing the friction between threads or between the bolt (screw) head and nut end face, or both, to achieve the purpose of anti-loosening.
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What are the methods for preventing fasteners from loosening?
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2025-03-31