Stainless Steel Screws And Nuts Are Prone To Galling Or Seizing During Assembly Due To The Following Main Reasons

Material Properties:

Stainless steel is relatively soft and ductile, making it susceptible to deformation under pressure. The heat and pressure generated during tightening can damage the protective oxide layer on the surface, leading to direct metal-to-metal contact and adhesion between threads.

Thermal Expansion and Deformation:
After fastening, slight deformation of the threads may occur. Over time, this can result in "fusion," making disassembly increasingly difficult.

Operational Factors:
Excessive force, overly rapid tightening, or the presence of foreign particles (such as metal debris or dirt) in the threads can significantly increase the risk of seizing.

Methods to Prevent Seizing:

• Use nuts made of different materials (e.g., brass nuts).
• Apply lubricants (such as grease or molybdenum disulfide).
• Use washers to distribute pressure evenly.
• Control tightening force and speed; preferably use a torque wrench.
• Ensure the nut is screwed on perpendicular to the screw axis to avoid misalignment.

Due to their lower hardness and higher susceptibility to deformation, stainless steel fasteners are more prone to seizing compared to carbon steel counterparts. Proper operation and lubrication can effectively reduce the occurrence of this issue.