Common standards and types of 12.9 grade screws

Common standards and types of 12.9 grade screws

Kind

According to the items, it can be divided into 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), 12.9-grade hexagon socket plug screws and other types. According to the thread is divided into coarse teeth, fine teeth, metric system, imperial system, American system, etc.

Grade 12.9 is a relatively hard variety of screws, with high hardness and tensile strength. Its Rockwell hardness (HRC) can reach 39-44, and its tensile strength can reach 1220N/mm2. However, due to the different shapes of screws, countersunk head hexagon socket head screws (flat cups) and semicircular head hexagon socket head screws (round cups) produced from the same material can only reach the tensile strength of grade 10.9. It can also fully meet the high requirements of special occasions and components of industrial and mining enterprises for fasteners.

The production of good 12.9 grade screws mainly depends on three aspects: raw materials, heat treatment, laboratory

Folding and editing the three elements of this paragraph

Folding Edit Common Standards in this Paragraph

Grade 12.9 hexagon socket screws are commonly used in high-strength bolt series: Grade 12.9 hexagon socket screws are generally used in occasions with high mechanical performance requirements. Such as injection molding machinery, hydraulic equipment, mold assembly and other places. The surface hardness of grade 12.9 hexagon socket screws can reach 39-44 degrees after heat treatment. The production standards of grade 12.9 hexagon socket head cap screws refer to German standard DIN912, national standard GB/T70.1, American standard and English standard. The supply range of US-made 12.9 grade hexagon socket head cap screws is from #4-1-1/2, and the supply range of English-made 12.9 grade hexagon socket head cap screws is from 1/4-1-1/2 and other common specifications are sold from stock.