| Exporter, Wholesale, Manufacturer | |
| Tehran |  |
| +989122003350 | |
- Price :negotiated
4 s bolt , Iran
- Price :To negotiate
- order by whatsapp
Square head bolts are manufactured from AISI 1045 carbon steel or 4140 alloy steel. The ultimate tensile strength of these materials ranges from 700 to 1100 MPa. The nominal diameter typically spans from M12 to M64 with effective lengths up to 300 mm. The strength grade per ISO 898-1 is usually 8.8, 10.9, or 12.9. Coarse thread pitch according to ISO 262 is the most common type. The square head shape and wrench size conform to DIN 557 or ANSI B18.2.4.1M standards. The head depth is typically 0.7 times the wrench width.
Square nuts are made from similar material, matching the bolts strength grade. The standard nut height is approximately 0.8 times the nominal diameter. The width across flats is usually designed at 1.5 times the nominal diameter. Common coatings include hot-dip galvanizing 50-80 microns or dacromet. These coatings provide corrosion resistance for over 500 hours in salt spray test. The allowable preload stress for grade 10.9 is about 70% of the yield stress. These fasteners are commonly used in steel structures and heavy machinery.You can order and buy 4 s bolt from Iran by contacting us through whatsaap and email.
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Primary Applications of Carriage Bolts
The carriage bolt is designed with a domed, square-necked head and a smooth shank. Its primary application is in wood-to-wood and wood-to-metal connections requiring security against loosening. It is used in wooden structures such as scaffolding, railings, wooden bridges, and outdoor furniture. The square section under the head locks into the wood, preventing the bolt from rotating when the nut is tightened. In metal connections, this bolt is typically placed in a pre-made square hole to achieve the same anti-rotation function. It is also used in childrens play equipment, light vehicles, and decorative fittings. Key advantages include easy installation, a clean appearance domed head, and resistance to vibrational loosening. Size and material selection galvanized, stainless steel should match the material thickness and working environment.
