Bolt , Iran

Round head screws are typically made from low-carbon steel Grade 2 or 4.6 with an electro-galvanized coating. Common thread diameters range from M3 to M16 with standard ISO metric pitch. The dome head height is approximately 0.5 to 0.7 times the nominal screw diameter. The fillet radius at the head base is typically 1.2 times the screw diameter. Their tensile strength is a minimum of 400 MPa for Class 4.6. The effective thread depth is designed at about 0.65 times the nominal diameter. A zinc coating with a thickness of 5 to 15 microns is applied. This coating provides corrosion resistance for up to 120 hours in salt spray tests. The allowable tightening torque for an M8 screw is about 10 to 15 Nm. The thread angle is precisely 60 degrees according to ISO 68-1.

The screw structure features a smooth, rounded dome head and a fully or partially threaded shank. The head diameter is about 1.5 to 2 times the nominal screw diameter. The head edges are fully rounded and free of sharp burrs. This design minimizes the risk of injury and surface damage. The overall length of standard screws ranges from 6 to 100 mm. The screw end is typically flat or slightly rounded. Its primary application is in aesthetic joints and high-traffic areas. Thread accuracy is manufactured to Class 6g for general use. Production from A2-70 stainless steel is also possible. These screws are used in furniture, automotive, and sports equipment industries.You can order and buy Bolt from Iran by contacting us through whatsaap and email.
WEBSITE: Bolt Iran