Specification Requirements For Steel Structural Bolts

With the development of economy, the demand for building steel structure buildings is also increasing, so steel structure bolts are an indispensable part of building steel structure. When using bolts correctly, the specified specifications must be followed. The specification requirements of steel structure bolts mainly involve the size, material and specifications of bolts. The size of the bolt should be based on the size of the structure, using the appropriate bolt size to ensure the reliability and fastness of the bolt.

The material of the bolt should be selected according to the performance of the structure, application conditions and environmental requirements, such as concrete structure, stainless steel bolts can be used; Hot forging bolts are often used for small production. If the structural importance is high, the bolt material can be selected high-quality steel, such as 20 carbon steel, 45 carbon steel, etc.

The specifications of bolts also include size, density, shape and coating. The size is generally M16-M40, and the density is five Shang or decimal system; The shape of the bolt should be in accordance with the requirements of the drawing, select the appropriate thread specification; Bolt coating should be selected according to the environment and use requirements, in the use of poor environment conditions, commonly used electroplating or brake film coating. In addition to selecting the material, size, shape and coating of the bolt as required, the method of tightening the bolt is also important. In general, when tightening bolts, manual or mechanical methods can be used; When tightening bolts, pay attention to tightening torque control, such as manual tightening, can be controlled by torque wrench, such as mechanical tightening, according to the requirements of the structure, using different tightening torque control.

In addition, the specification of steel structure bolts also requires the disassembly sequence and disassembly torque. When disassembling, remove the bolts one by one in accordance with the original disassembly sequence; When disassembling, use an appropriate wrench, and the disassembling torque should not be too large to avoid damaging bolts and nuts.

In summary, the use of steel structure bolts should comply with the specified specifications to ensure the reliability and firmness of the bolts. Reasonable use of bolts can not only ensure the stability of the structure during use, but also extend the service life of the structure.