For twist-off tension-control bolt assemblies, how far should the end of the bolt be from the outer face of the nut when properly installed?

In the case of twist-off tension-control bolt assemblies, the end of the bolt should be flush with the outer face of the nut when properly installed. This requirement ensures that the bolt has been tightened to the correct tension level, as the design of the assembly allows for visual confirmation of proper installation. When the bolt end is flush with the nut, it indicates that the necessary amount of twist has occurred, effectively breaking off the tension control feature of the bolt and confirming that the bolt is adequately tensioned.

This flush condition plays a critical role in structural applications, as it ensures the joint's integrity and load-bearing capacity. With proper installation, there's consistency in the performance of the joint and reduced risk of connection failure due to inadequate tensioning. Factors such as manufacturing tolerances and bolt length are also designed to accommodate this flush condition. Properly installed bolted connections contribute to the overall safety and reliability of the structural steel assembly.