bolt , Iran

Screws are categorized based on head geometry, thread type, and application. Hex head screws ISO 4017 ranging from M3 to M100 are the most common type. Socket head cap screws Allen ISO 4762 are used in confined spaces. Self-tapping screws for wood and sheet metal feature coarse threads and Pozidriv or Phillips heads. Anchor bolts, such as chemical and mechanical anchors, are designed for concrete. Lag screws with hex heads and tapered threads are used in wood. Socket head and shoulder screws serve precision assembly needs. Their materials range from steel, stainless steel, brass, titanium, and plastic, with strength classes from 3.6 to 14.9. Common coatings include galvanized, nickel, zinc dichromate, and epoxy.

Functionally, screws can be fully threaded, partially threaded, or fine-pitched ISO 965. High-strength structural bolts ISO 898-1 like Grade 10.9 and 12.9 are for heavy loads. Prevailing torque lock screws with integrated washers SEMs are widely used in automotive. Dowel screws have threaded ends on both sides. DIN, ANSI/ASME, and JIS standards define technical specifications. Screw selection depends on tensile/shear load, operating environment, and corrosion resistance requirements. Each screw type requires specific tightening torque and installation methods e.g., preload. Thread accuracy is produced in classes 4h to 8g, with standard lengths from 6 mm to 3 meters.You can order and buy bolt from Iran by contacting us through whatsaap and email.
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