Reasons And Countermeasures Of Stainless Steel Screw Locking

When assembling stainless steel bolts and nuts, we often lock them. What is lock? Locking, also known as occlusion, refers to the phenomenon that bolts and nuts are stuck and locked during the tightening process. It usually occurs between stainless steel bolts and stainless steel nuts, so it is also called stainless steel screw locking or stainless steel screw jamming.

1. The locking force of stainless steel is too large and the thermal conductivity is low, which is easy to cause thread locking. Stainless steel nuts are heated due to friction during rotation. The thermal conductivity of stainless steel is relatively low. When the pressure and heat generated destroy the chromium oxide layer (a stainless steel oxide layer that is not easy to rust), the metal teeth will directly block/shear and the stainless steel will become soft.

2. Both the inclination of the thread fit and the softness of stainless steel can cause jamming. During the installation process, the uneven or inclined force will make the central axis of the screw and nut incline greatly, which will easily damage the tooth shape and cause occlusion; if the iron is rubbed during the locking process, the hardness of the stainless steel screw is relatively soft.