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  2. 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 ...

  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. Hydraulic torque wrench - Wikipedia

    en.wikipedia.org/wiki/Hydraulic_torque_wrench

    A hydraulic torque wrench is a power tool designed to exert torque on a fastener to achieve proper tightening or loosening of a connection through the use of hydraulics. A torque wrench is applied to the nut either directly or in conjunction with an impact socket. Hydraulic torque wrenches apply a predetermined, controlled amount of torque to a ...

  5. 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 ...

  6. 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 ...

  7. Norbar Torque - Wikipedia

    en.wikipedia.org/wiki/Norbar_Torque

    Norbar Torque Tools Ltd specialises in the manufacture and worldwide distribution of torque tools for torque tightening, measurement and calibration. The primary office and factory location is in Banbury, United Kingdom and there are also Norbar sales, service and calibration facilities in Australia, United States, New Zealand, Singapore, China and India.

  8. Torque tester - Wikipedia

    en.wikipedia.org/wiki/Torque_tester

    A torque tester is a quality control device to test or calibrate torque -controlled tools. This includes electronic torque wrenches, click torque wrenches, dial torque wrenches, electric screwdrivers, air screwdrivers, pulse tools, cordless screwdrivers, nutrunners, and torque screwdrivers. Advanced torque testers include the ability to measure ...

  9. 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 ...

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