Tension Bolt Assemblies
Tension Fasteners systems are designed to be installed with various types of lightweight portable electric wrenches specifically intended for use with this style of structural fasteners. They can be utilized for any applications where A325 or A490 – Type I or Type III (weathering steel) hex bolts are specified. The installation tool has an inner socket which engages the spline tip of the bolt, while the outer socket engages the nut. The outer socket rotates the nut relative to the bolt spline, and when the tension is sufficient in the fastener, the spline tip simply twists-off, leaving the tightened bolt correctly installed in the connection.
The key advantage of this type of bolt is the installation time savings by eliminating the torque and tension testing requirements of hex bolt installation.