TC bolts use a proprietary lubrication on the nut, to control the clamping force of the bolt and ensure the appropriate tension level is achieved. When the proper tension level has been achieved the spline snaps off giving you a visual indication of proper installation. ![]() They are installed with a specialized electric shear wrench that has an outer socket that turns the nut counterclockwise, while grabbing the spline with the inner socket turning it clockwise. Tension Control Bolts assemblies come with their own built in tension control device (spline) to ensure dependable and repeatable tension levels are achieved with each installation. ![]() Tension Control Bolts, TC Bolts or Twist Off Bolts are now the most popular choice in high-strength structural bolting and formally recognized by the AISC (American Institute of Steel Construction) and the RCSC (Research Council on Structural Connections) as an approved installation method.Ī Tension Control Bolts consists of 1 bolt, 1 nut and 1 washer, pre-assembled and there for they are shown, 1 lot number, on the certification paperwork.
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