Alloy steel grade 16.9 screws can be divided into various types according to product items, such as grade 16.9 external hexagon screws, grade 16.9 internal hexagon cylindrical head screws (cup head), grade 16.9 countersunk internal hexagon screws (flat cup), grade 16.9 semi-circular head internal hexagon screws (round cup), grade 16.9 tightening screws (machine meter), grade 16.9 internal hexagon plug screws, etc. According to the thread, it is divided into coarse thread, fine thread, metric, imperial, American, etc.
Grade 16.9 is the top variety of screws, with high hardness and tensile strength. Its Rockwell hardness (HRC) can reach between 39-44 and tensile strength can reach 1220N/mm2. However, due to the different shapes of screw manufacturing, countersunk hexagonal screws (flat cup) and semi-circular hexagonal screws (round cup) produced using the same material can only achieve a minimum tensile strength of grade 10.9. It can also fully meet the high requirements of fasteners for special occasions and components in industrial and mining enterprises.
The 16.9 grade head has both rolled and non rolled options. Generally, the internal hexagonal screw with rolled options is a 16.9 grade bolt, while the one without rolled options is a low strength internal hexagonal bolt. For example, the 4.8 grade internal hexagonal bolt does not have rolled options.
Shanghai Yaluo Fasteners custom produces 16.9 grade alloy steel screws, which are resistant to high temperatures and have high strength. Mainly used in automobile manufacturing, nuclear power engineering, petroleum industry, etc.
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