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2. Multi-jackbolt tensioner - Wikipedia

   en.wikipedia.org/wiki/Multi-jackbolt_tensioner

   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]

3. Preload control - Wikipedia

   en.wikipedia.org/wiki/Preload_control

   Preload control. Amount of the no-load tension in the bolted joint (preload) greatly affects the reliability of the joint. Multiple techniques exist for preload control to ensure that the tension in the bolt is close to the one specified in the design (some bolt-to-bolt statistical variations are inevitable): [1] torque-controlled tightening is ...

4. Bolted joint - Wikipedia

   en.wikipedia.org/wiki/Bolted_joint

   The applied torque causes the bolt to "climb" the thread causing a tensioning of the bolt and an equivalent compression in the components being fastened by the bolt. The preload developed in a bolt is due to the applied torque and is a function of the bolt diameter, the geometry of the threads, and the coefficients of friction that exist in the ...

5. Torque wrench - Wikipedia

   en.wikipedia.org/wiki/Torque_wrench

   A click torque wrench. A torque wrench is a tool used to apply a specific torque to a fastener such as a nut, bolt, or lag screw.It is usually in the form of a socket wrench with an indicating scale, or an internal mechanism which will indicate (as by 'clicking', a specific movement of the tool handle in relation to the tool head) when a specified (adjustable) torque value has been reached ...

6. Torque-to-yield fastener - Wikipedia

   en.wikipedia.org/wiki/Torque-to-yield_fastener

   The torque applied to the fastener must be determined such that it does not contribute to a service condition where the fastener enters a low-cycle fatigue regime. In general, the use of torque-to-yield fasteners is deprecated except in cases where the materials and structures comprising the entire assembly are certified to be within tolerances ...

7. Preload (engineering) - Wikipedia

   en.wikipedia.org/wiki/Preload_(engineering)

   The most common usage is to describe the load applied to a fastener as a result of its being installed, i.e., before any external loads are applied (e.g., tightening the nut on a bolt). Preload in such cases is important for several reasons. First, a tightened bolt experiences only a small fraction of any external load that will be applied ...

8. Direct tension indicator - Wikipedia

   en.wikipedia.org/wiki/Direct_tension_indicator

   Functioning. DTIs are a function of induced tension. As a fastener assembly is tightened, the arch-like protrusions are compressed, and the change in distance between the base of the protrusions of the DTI washer and the protrusion apex correlates to a value of tensile force induced into the fastener. This distance can be verified by insertion ...

9. Bolt (fastener) - Wikipedia

   en.wikipedia.org/wiki/Bolt_(fastener)

   Bolt (fastener) Threaded fastener with an external male thread requiring a matching female thread. Bolt with a nut. A bolt is an externally helical threaded fastener capable of being tightened or released by a twisting force (torque) to a matching nut. The bolt has an external male thread requiring a matching nut with a pre-formed female thread.