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2. Bolt (fastener) - Wikipedia

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

   Bolt with a nut. A bolt is an externally helical threaded fastener capable of being tightened or released by a twisting force to a matching nut. The bolt has an external male thread requiring a matching nut with a pre-formed female thread. [1]

3. Bolted joint - Wikipedia

   en.wikipedia.org/wiki/Bolted_joint

   The preload achieved by torquing a bolt is caused by the part of the torque that is effective. Friction in the threads and under the nut or bolt head uses up some fraction of the applied torque. Much of the torque applied is lost overcoming friction under the torqued bolt head or nut (50%) and in the threads (40%).

4. Preload control - Wikipedia

   en.wikipedia.org/wiki/Preload_control

   Nut is rotated into position with very small torque applied. Once the external stretching force is removed, the preload is established; heat tightening is based on stretching the bolt by heating it. Once the bolt is expanded, the nut is secured using the turn-of-the-nut method. Upon cooling, a desired preload is achieved as the bolt contracts.

5. Screw thread - Wikipedia

   en.wikipedia.org/wiki/Screw_thread

   Where the rotation of a shaft would cause a conventional right-handed nut to loosen rather than to tighten due to applied torque or to fretting induced precession. Examples include: The left foot pedal on a bicycle [2] The left grinding wheel on a bench grinder; The axle nuts, or less commonly, lug nuts on the left side of some automobiles

6. Nut (hardware) - Wikipedia

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

   Sex bolt: Barrel nut, barrel bolt, binding barrel, Chicago screw, post and screw or connector bolt Has a barrel-shaped flange and protruding boss that is internally threaded Split nut: Split lengthwise into two pieces (opposed halves) so that its female thread may be opened and closed over the male thread of a bolt or leadscrew Sleeve nut ...

7. Preload (engineering) - Wikipedia

   en.wikipedia.org/wiki/Preload_(engineering)

   First, a tightened bolt experiences only a small fraction of any external load that will be applied later, so that a fully tightened bolt can (depending on the exact application) sustain a much greater load than a loosely tightened bolt. Second, a nut that is correctly tightened will resist becoming loose under the influence of vibration ...