bolt m.r , Iran

The Roll Bolt screw is a specialized fastener designed for hollow sections and thin metal sheets. This screw features stepped threads with variable pitch ranging from 2.0 to 2.5 millimeters and a thread angle of 35 degrees. The sharp needle-shaped tip has a 22-degree angle with three diamond-shaped cutting wings positioned around it. The cutting wings first create a hole with 3 to 4 millimeters diameter through the metal sheet. The stepped threads then form their own mating threads inside the hollow section wall without requiring any nut or rivet. This screw is manufactured from medium carbon steel with case hardening heat treatment producing surface hardness of 550 to 650 Vickers. The three-layer zinc, nickel, and chromium coating with 10 to 12 microns thickness provides excellent corrosion resistance. The maximum installation torque ranges from 8 to 12 Newton meters. Common applications include fastening steel hollow sections, aluminum profiles, and galvanized sheets with total combined thickness up to 5 millimeters.You can order and buy bolt m.r from Iran by contacting us through whatsaap and email.
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