Allen screw , Iran

Allen screws are manufactured from medium carbon alloy steel grade AISI 4140 or stainless steel series A2/AISI 304. Their tensile strength typically falls into classes 8.8 min 800 MPa to 12.9 min 1200 MPa. Common thread diameters range from M1.6 to M36 with fine or standard ISO metric pitch. The depth of the internal hex socket is typically 0.7 to 1 times the nominal screw diameter. The head angle for cap screws is precisely 90 degrees. These screws undergo quench and temper heat treatment. This process achieves a hardness of 32 to 39 Rockwell C. Common coatings include zinc dichromate with a thickness of 4 to 8 microns for corrosion resistance.

The fastener structure features a fully or partially threaded shank with a cylindrical head. The screw length, per DIN 912 or ISO 4762, ranges from 6 to 200 mm. Head diameter tolerance is ±0.1 mm and length tolerance is ±0.5 mm. Allowable tightening torque varies from 0.15 to 2000 Newton-meters depending on size and strength class. The modern design includes an underhead radius of at least 0.1 mm. This design reduces stress concentration. Thread geometric accuracy is within tolerance grade 6g or 6H. The dichromate coating can enhance salt spray resistance up to 500 hours.You can order and buy Allen screw from Iran by contacting us through whatsaap and email.
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