Tension control bolt

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A tension control bolt (TC bolt) is a heavy duty bolt used in steel frame construction. The head is usually domed and is not designed to be driven. The end of the shank has a spline on it which is engaged by a special power wrench which prevents the bolt from turning while the nut is tightened. When the appropriate tension is reached the spline shears off.{{Cite web | url=https://lejeunebolt.com/lbc/wp-content/uploads/2016/07/howthetcboltworks.pdf | title=Tension Control Bolts | website=lejeunebolt.com}}