Hexagon screws are similar to countersunk screws, both of which are nails buried in the machine, and the connection strength is relatively large, but the hexagon screws must be installed and disassembled with the corresponding specifications of the hexagon wrench. Hex socket screws are generally used on various machine tools and their accessories. According to the requirements of use, hex socket screws have the following requirements on performance.
The nominal tensile strength of screw material needs to reach 400MPa class.
The bending ratio of screw material is 0.6; The nominal yield strength of screw material should be up to 400×0.6=240MPa class. After heat treatment, the material of high-strength screws with performance grade 10.9 can meet the following requirements:
a. The nominal tensile strength of screw material can reach 1000MPa class.
b. The bending ratio of screw material is 0.9; The nominal yield strength of screw material reaches 1000×0.9=900MPa.
The meaning of hexagon screw performance grade is the international standard, that is, screws with the same performance grade also have the same performance, regardless of the difference in the material and origin.
The classification of hexagon screws is basically what is described above. If the screw grade is different, then the price in the market must be different. General high-strength hex screws must be much more expensive than ordinary hex screws. The commonly used hex socket screws on the market are 4.8, 8.8, 10.9, and 12.9.
Tips: If the head of the hex screw is eccentric or crooked, it may lead to very serious problems. For example, from the appearance of the product, the overall will not be beautiful. And if the screw is installed eccentrically, it is easy to lead the production tool punch needle easy to break. The most serious can also lead to a hexagon screw broke head and a series of problems.
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