Size specification of flat round head hexagon screw
The materials of ISO flat round head hexagon screw: Hex screws with flat round head are divided into carbon steel flat round head hex screws and stainless steel flat round head hex screws according to the materials. Carbon steel flat round head hex screws according to the performance grade is divided into 8.8, 10.9, 12.9, belong to the high-strength and high-grade hex screws.
Generally, the carbon content of carbon steel is used to distinguish the chemical composition and heat treatment of low carbon steel, medium carbon steel, high carbon steel and alloy carbon steel, refer to the table below:
Carbon steel material needs surface treatment to achieve the effect of aesthetic and corrosion resistance.
The common surface treatment methods are electroplating and blackening. Electroplating has zinc plating (blue white zinc and color zinc), nickel plating, chromium plating, selenium plating and so on, can be selected according to user requirements.
Stainless steel flat round head hexagon screws are mostly austenitic stainless steel A2, A4。Austenitic stainless steel has better heat resistance, corrosion resistance and weldability. The most widely used materials are SUS304 and SUS316.
The difference between SUS304 and SUS316 is: After cold processing, the magnetic properties of SUS316 are lower than that of SUS304, and the corrosion resistance of material 316 is also higher than that of material 304.
The chemical composition of stainless steel A2 and A4 refer to the following table:
ISO7380 flat round head hexagon screw’s mechanical capability: Different materials and different performance levels, its mechanical capability are also different.
Carbon steel flat round head hex screw’s mechanical property:
ISO7380 flat round head hexagon screw’s mechanical capability: Different materials and different performance levels, its mechanical capability are also different.
Carbon steel flat round head hex screw’s mechanical property:
flat round head hexagon screw performance grade conforms to the international standard, the same capability grade of flat round head hexagon screw, although the material and origin are different, its performance is the same, we only need to choose according to the capability grade.
Stainless steel flat round head hexagon screw’s mechanical capability:
Stainless steel flat round head hexagon screws are relatively resistant to corrosion, but their hardness and strength are not as good as carbon steel flat round head hexagon screws under normal conditions. Therefore, in the use of stainless steel flat round head hexagon screw, pay attention to the maintenance of its surface finish and accuracy. Do not strike or knock at will. Because of the ductility of stainless steel that the steel scrap generated during use, which are easy to stick to the thread level of the nut, and easy to lead to lock. Although carbon steel flat round head hexagon screw may have steel scrap when used, it is not easy to lock.
The application scope of the flat round head hexagon screw: ISO7380 flat round head hexagon screws are similar to countersunk head screws. The head can be embedded in the parts of the countersunk hole, with smooth appearance and compact structure. Inner hexagon can bear large tightening torque, high connection strength, can be used instead of hexagon bolts.
The flat round head hexagon screws are easier to be tightened, usually with the hexagon wrench to tighten
The hexagon wrench looks like this:
Of course, other installation tools can also be used. The flat round head hexagon screws are generally used on flat surfaces and are mostly used for fixing protective doors and windows. It can also be applied for motors, household appliances, furniture, electronic equipment, etc. Yijin Hardware specializes in the production of flat round head hexagon screws and other fasteners. The quality requirements and delivery are all world-leading. Believe that Yijin Hardware can bring you an unprecedented purchasing experience and meet all your needs!
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