Analysis of Hexagon Shaped Bolt Backing Out Issues

When it comes to the failure of hexagon shaped bolt, common failure modes can be broadly classified into three categories: bolt fracture, bolt loosening, and bolt backing out. Today, we will primarily focus on the reasons and influencing factors behind the backing out of a hexagon shaped bolt. We hope that this analysis helps you identify and resolve these issues quickly in your work.

What Does Hexagon Shaped Bolt Backing Out Mean?

Hexagon shaped bolt backing out refers to the phenomenon where a hexagon shaped bolt becomes loose during tightening and gradually backs out from the connected components. This results in the loss of the fixed connection, which could potentially lead to safety incidents or partial failure of the entire system. 

Root Causes of Hexagon Shaped Bolt Backing Out

Material Issues

The material used for the hexagon shaped bolt is a key factor determining its performance. If the material lacks sufficient strength, toughness, or wear resistance, the hexagon shaped bolt may undergo plastic deformation when subjected to stress, eventually leading to backing out.

Manufacturing Process Issues

The quality of the manufacturing process also affects the performance of the hexagon shaped bolt. For example, if the heat treatment process is substandard, it can result in the bolt having inadequate or uneven hardness, which impacts its strength and toughness. Additionally, impurities remaining during the casting process can reduce the mechanical properties of the hexagon shaped bolt.

Environmental Factors

Environmental conditions are significant contributors to hexagon shaped bolt backing out. For instance, exposure to extreme temperatures, corrosion, or vibrations can degrade the bolt's performance and cause it to back out.

Assembly and Maintenance Factors

Improper assembly, such as aggressive installation or over-tightening, can damage the hexagon shaped bolt. Furthermore, delayed maintenance, leading to corrosion or wear, is another important factor contributing to backing out.

Solutions to Hexagon Shaped Bolt Backing Out

Tightening Equipment and Tool Issues

• The precision of the tightening equipment and tools is out of tolerance.

  
  

• Program settings are inappropriate or incorrect.

  
  

Operational Factors

• The torque monitoring set value is out of tolerance.

  
  

• Operations were not performed according to process requirements, leading to over-tightening or under-tightening.

  
  

Hexagon Shaped Bolt and Connection Component Quality Issue

• Excessive tensile strength.

  
  

• The radius of the head of the hexagon shaped bolt and the mating surface have a gap.

  
  

Hexagon Shaped Bolt Connection Issues

Excessive friction coefficient

• The roughness of the contact surface of the hexagon shaped bolt exceeds tolerance.

  
  

• The roughness of the connecting component's surface exceeds tolerance.

  
  

• The quality of the threads does not meet technical requirements.

Contaminants in the hole of the hexagon shaped bolt (i.e., impurities).