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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. Bolt (fastener) - Wikipedia

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

    A bolt is an externally helical threaded fastener that fastens objects with unthreaded holes together. This is done by applying 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. [ 1] Unlike a screw, which holds objects together by the restricting motion ...

  4. Tap and die - Wikipedia

    en.wikipedia.org/wiki/Tap_and_die

    A tap is used to cut or form the female portion of the mating pair (e.g. a nut ). A die is used to cut or form the male portion of the mating pair (e.g. a bolt ). The process of cutting or forming threads using a tap is called tapping, whereas the process using a die is called threading . Both tools can be used to clean up a thread, which is ...

  5. Socket wrench - Wikipedia

    en.wikipedia.org/wiki/Socket_wrench

    Socket wrench. A socket wrench (or socket spanner) is a type of spanner (or wrench [ 1] in North American English) that uses a closed socket format, rather than a typical open wrench/spanner to turn a fastener, typically in the form of a nut or bolt. [ 2] The most prevalent form is the ratcheting socket wrench, often informally called a ratchet.

  6. Screw mechanism - Wikipedia

    en.wikipedia.org/wiki/Screw_mechanism

    Screw mechanism. Animation showing the operation of a screw. As the screw shaft rotates, the nut moves linearly along the shaft. This is a type called a lead screw. A machine used in schools to demonstrate the action of a screw, from 1912. It consists of a threaded shaft through a threaded hole in a stationary mount.

  7. Fastener - Wikipedia

    en.wikipedia.org/wiki/Fastener

    A fastener (US English) or fastening (UK English) [ 1] is a hardware device that mechanically joins or affixes two or more objects together. In general, fasteners are used to create non-permanent joints; that is, joints that can be removed or dismantled without damaging the joining components. [ 2] Steel fasteners are usually made of stainless ...

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