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These "extend" the length of the socket and allow access to nuts or bolts that are difficult to reach. Extensions are typically 1 ⁄ 2 to 20 inches (15 to 510 mm) in length in roughly 1-to-3-inch (25 to 75 mm) increments. They are sometimes attached together to get a needed length extension, and often have a knurled section for added grip.
The overtorqueing sometimes results in the failure (breakage and forceful scattering) of any of the items in the jury rig (e.g., socket, breaker bar, wrench, pipe) or of the components being worked on (e.g., nut, bolt, loadbinder), and when it does so, the fragments can injure workers in the line-of-fire. [2] [3]
Multi-jackbolt tensioners (MJTs), registered under the trademark Superbolt or Supernut, are designed to decrease the torque required to tighten large bolted joints. One of the major problems associated with traditional bolt tightening methods is as the diameter of the bolt increases, the amount of torque required to tighten it increases in the third power of the diameter. [1]
Breaker bar. A breaker bar (also known as a power bar) is a long non-ratcheting bar that is used with socket wrench-style sockets.They are used to break loose very tight fasteners because their additional length allows the same amount of force to generate significantly more torque than a standard length socket wrench.
Thread engagement is the length or number of threads that are engaged between the screw and the female threads. Bolted joints are designed so that the bolt shank fails in tension before the threads fail in shear, but for this to hold true, a minimum thread engagement must be achieved. The following equation defines this minimum thread ...
Stud bolt A threaded rod , also known as a stud , is a relatively long rod that is threaded on both ends; the thread may extend along the complete length of the rod. [ 1 ] They are designed to be used in tension . [ 2 ]