A325 Tension Control Bolts
5/8''~1-1/4''
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：A325 Tension Control Bolts
Our Tension Control Bolts feature a unique splined end that shears off when the precise preload is achieved during installation, eliminating the need for torque wrenches or turn-of-nut methods. The A325 TC Bolt is a high-strength structural fastener conforming to ASTM A325 (now covered under ASTM F3125 Grade A325), offering minimum tensile strength of 120 ksi (827 MPa) for diameters 1/2"through 1". As a Steel Structural Tension Control Bolt, it is widely used in steel frame connections, bridge girders, high-rise buildings, industrial plants, and wind towers. Installation requires a special tension-control wrench, which provides consistent and reliable bolt tension. These bolts are available with heavy hex heads and come in various lengths and diameters. A325 TC bolts are typically furnished with a matched nut and washer.
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