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2. Torque screwdriver - Wikipedia

   en.wikipedia.org/wiki/Torque_screwdriver

   Torque screwdriver. A torque screwdriver is a screwdriver with components that ensure tightening to a specified torque, ensuring tightening which is sufficient, but not excessive. An insufficiently tightened screw connection may loosen in operation, and excessive tightening can damage parts; for example, if the nuts holding the wheel of a car ...

3. Bolted joint - Wikipedia

   en.wikipedia.org/wiki/Bolted_joint

   Torque charts are available to specify the required torque for a given fastener based on its property class (fineness of manufacture and fit) and grade (tensile strength). Spring Analogy for a Bolted Joint. When a fastener is tightened, a tension preload is develops in the bolt, while an equal compressive preload forms in the clamped parts.

4. 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 ...

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 ...

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7. 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 ...