ASTM A325 TC bolts
3/4''~1-1/8
A325 Tension Control Bolts (TC bolts) are high-strength structural fasteners with a splined end that snaps off at precise preload during installation. They ensure consistent bolt tension without torque wrenches, commonly used in steel bridges and buildings. ASTM A325 is now covered under ASTM F3125 Grade A325.
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Product Name：ASTM A325 TC bolts
Our ASTM F3125 Grade A325 bolts are high-strength structural fasteners that meet the latest standard covering legacy A325 specifications. These bolts provide a minimum tensile strength of 120 ksi (827 MPa) for diameters 1/2"through 1". Specifically, the ASTM A325 TC bolts feature a splined end designed to shear off at precise preload during installation using a tension-control wrench, ensuring consistent and reliable bolt tension without torque wrenches. As a complete A325 Tension Control Structural Assembly, each bolt comes supplied with a matched heavy hex nut and washer, ready for steel structure connections such as bridge girders, high-rise buildings, industrial plants, and wind towers. The TC assembly eliminates human error in preload application and speeds up installation significantly.
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