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2. Screw thread - Wikipedia

   en.wikipedia.org/wiki/Screw_thread

   The axle nuts, or less commonly, lug nuts on the left side of some automobiles; The securing nut on some circular saw blades – the large torque at startup should tend to tighten the nut; The spindle on brushcutter and line trimmer heads, so that the torque tends to tighten rather than loosen the connection

3. Nut (hardware) - Wikipedia

   en.wikipedia.org/wiki/Nut_(hardware)

   An M4 nut threaded onto an Allen key socket head screw. ... Four-sided nut. ... Left to right: Slotted, square (upper), T-nut (lower), cap ...

4. List of screw and bolt types - Wikipedia

   en.wikipedia.org/wiki/List_of_screw_and_bolt_types

   A fastener comprising a mated pair of screw and post (binding barrel), which are a machine screw and a nut that is barrel-shaped. The nut has a flange and a protruding boss that is internally threaded. The bolt (mated pair, screw and post) sits within the components being fastened, and the flange provides the bearing surface.

5. Screw - Wikipedia

   en.wikipedia.org/wiki/Screw

   Most screws are tightened by clockwise rotation, which is called a right-hand thread. [4] [5] Screws with a left-hand thread are used in exceptional cases, such as where the screw will be subject to counterclockwise torque, which would tend to loosen a right-hand screw. For this reason, the left-side pedal of a bicycle has a left-hand thread. [6]

6. Screw mechanism - Wikipedia

   en.wikipedia.org/wiki/Screw_mechanism

   Therefore, most threaded parts and fasteners have right-handed threads. One explanation for why right-handed threads became standard is that for a right-handed person, tightening a right-handed screw with a screwdriver is easier than tightening a left-handed screw, because it uses the stronger supinator muscle of the arm rather than the weaker ...

7. Bolt (fastener) - Wikipedia

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

   Hanger bolt - Bolt that has no head, machine threaded body followed by a wood threaded screw tip. Allow nuts to be attached to what is really a screw. Hex bolt - Bolt with a hexagonal head and threaded shank. Section immediately under head may be unthreaded for fastening thicker materials. J bolt - Bolt shaped like the letter J, used for tie downs.