Flat head internal and external high strength bolts price

High-strength bolts are made of high-strength materials. The screws, nuts and washers of high-strength bolts are made of high-strength steel, such as commonly used steel, boron steel, manganese-titanium-boron steel, etc. Ordinary bolts are commonly made of (equivalent to the past) steel.
From the perspective of strength level: High-strength bolts are increasingly used. Commonly used are two strength levels: . and . Among them, . is the most common. The lower strength grades of ordinary bolts are generally ., ., . and .
From the perspective of stress characteristics: high-strength bolts exert pre-tension force and transmit external force by friction. Ordinary bolt connections rely on the shear resistance of the bolt rod and the pressure bearing of the hole wall to transmit the shear force. When tightening the nut, the pre-tension force is very small and its impact can be ignored. However, in addition to the high material strength of the high-strength bolt, it also exerts a large pre-tension force on the bolt to make the connection The extrusion force is generated between the components, resulting in a large friction force perpendicular to the screw direction, and the pretension force, anti-slip coefficient and steel type all directly affect the bearing capacity of high-strength bolts.
Bolt material: Steel bolt specifications: ~. Since this type of steel easily forms a passivation film on the surface, and this passivation film will prevent the bolt from obtaining a chemical nickel phosphorus layer with good adhesion, special pretreatment measures must be taken to remove the film first and measures should be taken to prevent its regeneration. Only by doing this can we ensure a good bonding force between the plated coating and the substrate. At the same time, the geometric dimensions of the bolt make it more difficult to inspect the quality of the nickel-phosphorus plating treatment and process.
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