What are the safety standards for screws?

The safety standards of screws mainly include the following aspects:

Thread specifications: The national standard for screws strictly stipulates the thread specifications, including parameters such as pitch, thread angle, and nominal diameter, to ensure that screws can cooperate well with nuts or bolts and achieve the expected fastening effect.

Material requirements: The standard stipulates the types of materials, chemical composition, and heat treatment requirements for screws, etc., to ensure that screws can maintain stable performance under different working conditions.

Mechanical properties: The standard specifies in detail the indicators such as the tensile strength, shear strength, and torsional strength of screws. These indicators are directly related to the bearing capacity and safety of screws in use.

Surface treatment: The standard stipulates the surface treatment methods of screws, such as the types of coating and thickness requirements, in order to improve their corrosion resistance and aesthetics.

Marking: The standard also stipulates the content and location of the screw marking, so that users can correctly identify and use the screws.