Types of 12.9 grade high strength screws

　12.9 grade high strength screwThe variety is quite rich and can be classified mainly by item and thread.

According to the classification of items, there are mainly 12.9-grade external hexagon screws, 12.9-grade hexagon socket head screws (cup heads), 10.9-grade countersunk head hexagon socket screws (flat cups), 10.9-grade semicircular head hexagon socket screws (round cups), 12.9-grade set screws (machine meters) and 12.9-grade hexagon socket plug screws, etc.

According to the classification of thread, there are mainly coarse teeth, fine teeth, and metric, imperial, American and other types. The high strength of these screws, for example, the surface hardness of grade 12.9 hexagon socket screws after heat treatment can reach 39~44 degrees, which can fully meet the high requirements of special occasions and parts of industrial and mining enterprises for fasteners, such as injection molding machinery, hydraulic equipment, mold assembly and other places.

In addition, from the material point of view, grade 12.9 high-strength screws mainly include carbon steel, stainless steel, and copper. Among them, alloying elements may be added to carbon steel to increase the special properties of steel, such as 35, 40 chromium molybdenum, SCM435, 10B38, etc. Stainless steel is mainly divided into austenite (18% Cr, 8% Ni), which has good heat resistance, corrosion resistance and weldability. Copper is commonly used as brass or zinc-copper alloy.

Please note that the specific selection of screws needs to be considered according to the actual application scenario, material requirements, cost budget and other factors. For more detailed information, it is recommended to consult the screw supplier or manufacturer.