Expansion screw is generally used in engineering construction, according to the classification, it will be divided into five grades. Better performance of the expansion screw, its use of materials are after high temperature treatment to achieve. The tensile strength of the material reaches about 1000 level. The bending strength of the material has also reached the corresponding standard, the performance is generally divided according to the international standards. The screw with the same performance level will have different differences whether in material in the place of origin, the working performance is the same. In the design, you just need to choose the performance level.

However, there are still some things to pay attention to when using the expansion screw. What we should pay attention to is the length of the expansion pipe. However, the specific construction process should be carried out according to different depth, residual substances may be produced in the hole, so it is better to carry out the construction in the depth of about 5mm. As long as the size is ensured, the depth of the pipe body is mastered, then the expansion spiral left in the ground will be less than the length of the expansion pipe.

When expansion screws are used, the higher the hardness of the ground is, the better it is. At the same time, it also depends on the stress of fixed objects. The mechanical strength installed in the soil is several times of that of brick. Ensure that the correct way of installation will make the static force to a certain extent on a large basis. It is because the operation is simple the success rate of construction is relatively high, so the expansion screw is widely used. In addition, it won't be disturbed. In addition, there is the value of recycling in use. The high-end design concept combines with the practical application produces good results.