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  2. Multi-jackbolt tensioner - Wikipedia

    en.wikipedia.org/wiki/Multi-jackbolt_tensioner

    Multi-jackbolt tensioners (MJTs), registered under the trademark Superbolt or Supernut, are designed to decrease the torque required to tighten large bolted joints. One of the major problems associated with traditional bolt tightening methods is as the diameter of the bolt increases, the amount of torque required to tighten it increases in the third power of the diameter. [1]

  3. Bolted joint - Wikipedia

    en.wikipedia.org/wiki/Bolted_joint

    Bolt preload can also be controlled by torquing the bolt to the point of yielding. Under some circumstances, a skilled operator can feel the drop off of the work required to turn the torque wrench as the material of the bolt begins to yield. At that point the bolt has a preload determined by the bolt area and the yield strength of the bolt ...

  4. Bolt (fastener) - Wikipedia

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

    Bolted joint in vertical section Screw joint. The distinction between a bolt and a screw is poorly defined. The academic distinction, per Machinery's Handbook, [3] is in their intended purpose: bolts are designed to pass through an unthreaded hole in a component and be fastened with the aid of a nut.

  5. Screw - Wikipedia

    en.wikipedia.org/wiki/Screw

    An assortment of screws, and a US quarter for size comparison A wood screw: a) head; b) non-threaded shank; c) threaded shank; d) tip The six classical simple machines. A screw is an externally helical threaded fastener capable of being tightened or released by a twisting force to the head. The most common uses of screws are to hold objects ...

  6. Exclusive-Boeing presses suppliers on tightening bolts after ...

    www.aol.com/news/exclusive-boeing-presses...

    WASHINGTON (Reuters) -Boeing issued a bulletin to its suppliers late last week that laid out practices to ensure bolts are properly torqued after multiple airlines reported loose hardware during ...

  7. Safety wire - Wikipedia

    en.wikipedia.org/wiki/Safety_wire

    For example, if a standard automotive bolt in the U.S. is being secured, then the safety wire when installed should put tension on the bolt in a clockwise direction, since that is the direction that the bolt turns to tighten. [7] When drilling a fastener, the choice of where to drill it depends on the type of fastener and to what it will be wired.

  8. Investigators home in on hardware in probe of midair Alaska ...

    www.aol.com/news/united-finds-bolts-tightening...

    Amid statements from airlines that their technicians found loose bolts on the same model of Boeing plane involved in a midair emergency, federal officials indicated an increasing focus on the ...

  9. Hex key - Wikipedia

    en.wikipedia.org/wiki/Hex_key

    Concerning the dissemination of the screws and wrenches, Hallowell said "the transition from a square head set screw [Hallowell refers here to the then-ubiquitous external-wrenching square drive] to a hexagon socket head hollow set screw[,] for which had to be developed special keys or wrenches for tightening or loosening the screw, was the ...

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