flange hex bolt , Iran

The flange hex bolt features a standard hexagonal head with an integrated circular flange directly beneath the head. The flange is designed with an angle of 15 to 30 degrees relative to the bolt axis for uniform stress distribution. Flange diameter for size M10 reaches approximately 22 millimeters while size M20 reaches about 38 millimeters. Flange thickness is typically equivalent to 0.2 to 0.3 times the nominal bolt diameter. The material is carbon steel manufactured in grades 5.6, 8.8, 10.9, and 12.9 according to ISO 898-1 standards. Quenching and tempering heat treatment is mandatory for grades above 8.8 to achieve proper mechanical properties. Anti-corrosion coatings include hot-dip galvanizing with 40 to 80 microns thickness or electroplated zinc white with 5 to 12 microns thickness.

The elimination of a separate washer due to the integrated flange reduces installation torque by up to 15 percent. This design also completely eliminates the risk of losing washers on assembly lines during high-speed production. Ultimate tensile strength for grade 8.8 in size M12 reaches 840 megapascals with a yield torque of approximately 120 Newton-meters. The underside surface of the flange features radial or spiral serrations for locking against vibration and loosening. Serration angle is typically 60 degrees with a height of 0.2 to 0.4 millimeters for optimal grip. Clamping force generated by these bolts is approximately 20 percent higher compared to standard bolts with separate washers. Primary applications include flange-to-flange connections in automotive vehicles, construction machinery, and pre-engineered steel structures. Recommended installation torque for size M16 grade 8.8 equals 300 Newton-meters under dry threaded conditions.You can order and buy flange hex bolt from Iran by contacting us through whatsaap and email.
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