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Bolt M.r Iran

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09121933785

bolt m.r

The cylindrical screw features a perfectly uniform body diameter with a fully threaded or partial thread shank design. The head geometry is precisely machined as either hexagon or hex socket (Allen) type with tight tolerances. Nominal diameter sizes range from M1.6 up to M64 millimeters according to standardized thread profiles. Thread pitch options include coarse (standard) and fine series for specific vibration-resistant applications. The thread angle measures exactly 60 degrees with sharp crest and root radius for optimal load distribution. Pitch diameter tolerance classes include 6g for external threads and 6H for internal threads. The head height to diameter ratio follows a fixed proportion of 0.7 to 0.8 for hexagon heads. Socket head versions have a cylindrical head with 0.5 to 1.5 millimeters chamfer on top edge.

Cylindrical screws are manufactured in property classes 4.6, 5.6, 8.8, 10.9, and 12.9 for steel versions. Class 8.8 screws have minimum tensile strength of 800 Newtons per square millimeter with 640 yield strength. Class 10.9 screws achieve 1040 tensile strength for high-stress bolted connections. Class 12.9 represents the highest strength grade with 1220 Newtons per square millimeter tensile capacity. Stainless steel grades A2 (304) and A4 (316) provide corros


rahmati-co	09121933785

rahmati-co

Iran

09121933785

bolt m.r

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.