ASTM F1852 A325 Heavy Hex Twist-Off Bolt Plain Carbon Steel

Unlike the round-head version commonly used in general structural connections, the heavy hex head design offers increased bearing surface and is often specified for projects requiring enhanced load distribution and compatibility with traditional structural steel assemblies. Manufactured from heat-treated alloy steel or high-strength carbon steel, heavy hex torque shear bolts are available in ASTM F1852 and ASTM F2280 grades, providing performance equivalent to A325 and A490 structural bolting systems respectively. Typical sizes range from 1/2 inch to 1-1/8 inch, with metric dimensions available upon request. Surface finishes include plain, black oxide, mechanical galvanized, and hot-dip galvanized coatings for various environmental conditions.

These fasteners are widely used in steel-frame buildings, bridges, industrial plants, power generation facilities, transmission towers, offshore structures, and other critical applications where structural integrity, vibration resistance, and installation efficiency are of paramount importance.