1. The fitting angle of the thread is wrong. The fitting between the stainless steel pan head screw and the nut is a clearance fit. Their respective standards and tolerances, so if they are not well designed, the middle axis may not be on this line during assembly. When assembled, it will be inclined. The greater the deflection angle, the smaller the contact and force area between the threads, and the threads are easily damaged, resulting in locking.

2. The stainless steel material is soft and easy to stick. The screw rubs during the locking process, and stainless steel debris falls out. Due to the soft material of stainless steel, it may stick to the internal thread instead of falling out, resulting in the internal thread of the screw. locked in.

3. The thermal conductivity of stainless steel is low. When the screw is assembled with the nut, friction and heat generation also occur, but the thermal conductivity of stainless steel is relatively low. When the pressure and heat generated destroy the oxide layer, it will directly cause the tooth pattern. Blockage occurs, coupled with the softness of stainless steel, it is also prone to sticking.

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