Tension Control Bolts (TC Bolts)

Tension control bolts, TC Bolts or Twist Off Bolts, have become one of the world’s most widely used method to tension high strength structural bolts, as they can be used in almost all steelwork connections. As a high strength tension control bolt distributor, AFT offers ASTM A325 and A490 TC bolts in bolt sizes ranging from 5/8” up to 1” and lengths from 1-1/2” up to 7”. The finishes include plain and galvanized for additional corrosion protection.

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TC Bolts Fastening System

TC bolts consist of a three-piece fastening system with 1) a round head bolt with a truncated, flat surface area at the top of the bolt, and a 24-sided tip which protrudes from the opposite end. The tip is calibrated to shear off when the proper tension is applied. 2) a heavy hex nut and, 3) a structural flat washer. 

Tension Control Bolts in Bulk


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