Technical Parameters of Anti-loosening Nuts

The technical parameters of anti-loosening nuts serve as key indicators for ensuring their performance and effectiveness in application. These parameters primarily encompass the following aspects:

 

Dimensional Specifications: The dimensional specifications of anti-loosening nuts cover parameters such as nominal diameter, thread pitch, and thread length. Nominal diameters typically include various sizes-such as M6, M8, M10, and M12-with different specifications suited to different connection scenarios.

 

Mechanical Property Class: The mechanical property class is a crucial metric for assessing a nut's strength and hardness. Common classes include 4.8, 8.8, and 10.9; a higher numerical value indicates greater strength and hardness, signifying the nut's capacity to withstand heavier loads.

 

Hardness: Hardness reflects a nut's resistance to localized deformation-specifically, its ability to withstand plastic deformation, indentation, or scratching. It is typically measured using metrics such as Rockwell Hardness (HR) or Brinell Hardness (HB).

 

Anti-loosening Performance Indicators: Anti-loosening performance constitutes the core characteristic of anti-loosening nuts, primarily comprising the torque coefficient and the anti-loosening torque. The torque coefficient illustrates the relationship between the applied torque and the axial preload force during the tightening process; it is typically required to fall within the range of 0.1 to 0.2. The anti-loosening torque refers to the specific torque required to initiate the loosening of the nut; a higher value for this parameter indicates superior anti-loosening effectiveness.

 

Surface Treatment: The method of surface treatment directly impacts a nut's corrosion resistance and service life. Common treatment methods include zinc plating, blackening, and Dacromet coating. Zinc plating provides excellent rust-prevention properties and is suitable for general industrial environments, whereas Dacromet coating offers superior corrosion resistance, making it ideal for use in harsh environments such as marine or chemical settings.