A490M Heavy Hex Bolt
M16-M27
A490M Heavy Hex Bolt is a metric high-strength structural bolt with a larger-than-standard hex head, designed for heavy steel connections in construction and bridge applications.
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Product Name：A490M Heavy Hex Bolt
The Hexagon head bolts A490M are high-strength fasteners manufactured under ASTM A490M (now incorporated into ASTM F3125/F3125M), designed specifically for critical steel structure connections. As a Grade10.9 high-strength hexagon bolt, they achieve a minimum tensile strength of 1040 MPa for diameters M12 through M36, delivering excellent load-bearing capacity after quenching and tempering heat treatment. These bolts feature a heavy hex head geometry that offers a larger bearing surface and thicker head height compared to standard hexagon bolts, making them ideal as A490M heavy hex structural bolts for bridges, high-rise buildings, industrial plants, and other demanding applications. They are available in Type 1 (alloy steel for general use) and Type 3 (weathering steel for atmospheric corrosion resistance). Proper installation requires hardened washers and matching high-strength nuts (e.g., ASTM A563M Grade 10S or 10S3), while hot-dip galvanizing is generally not recommended due to the risk of hydrogen embrittlement.
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