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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. Hydraulic torque wrench - Wikipedia

   en.wikipedia.org/wiki/Hydraulic_torque_wrench

   Four narrow-clearance hydraulic torque wrenches on a flange. 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 ...

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-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 ...

6. Wrench size - Wikipedia

   en.wikipedia.org/wiki/Wrench_size

   Width across flats is the distance between two parallel surfaces on the head of a screw or bolt, or a nut, mostly for torque transmission by positive locking. The term width across flats (AF) is used for the following forms: 2-socket = round material with two surfaces; 4-socket = profile square section; 6-socket, 8-square = regular polygons

7. List of DIN standards - Wikipedia

   en.wikipedia.org/wiki/List_of_DIN_standards

   Prevailing torque type hexagon nuts with flange and with non-metallic insert: Withdrawn: DIN EN 1663, DIN EN 1666: ISO 7043 (modified), ISO 12125 (modified) DIN 6927: Prevailing torque type all-metal nuts with flange: Withdrawn: DIN EN 1664, DIN EN 1667: ISO 7044 (modified), ISO 12126 (modified) DIN 6935: Cold bending of flat rolled steel: Active

8. 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.

9. Mechanical joint - Wikipedia

   en.wikipedia.org/wiki/Mechanical_joint

   Joints are easily assembled/ disassembled by using a torque wrench or other fastener tooling. [7] Clamped members can be axially tensioned at variable preloads. Disadvantage: Threaded components can fail from fatigue failure. [8] Joints can come loose, requiring re-torqueing. [9] Application: Pipe flanges; Automotive engines; Foundation bolts [10]