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  2. Screw extractor - Wikipedia

    en.wikipedia.org/wiki/Screw_extractor

    The screw is drilled out with the appropriate drill and drill bushing. The extractor is then hammered into the hole with a brass hammer, because a steel hammer is more likely to cause the extractor to break. The appropriate special nut is then attached to the end of the extractor. The nuts can then be turned with a wrench to remove the screw. [1]

  3. Pipe recovery operations - Wikipedia

    en.wikipedia.org/wiki/Pipe_recovery_operations

    Key Seated Stuck Pipe. Key seating occurs when the drill string becomes off-centered in the wellbore, and the pipe collars become caught on a deviation in the wellbore. If the rig is able to move the drill string freely downhole, but every time the drill string is pulled upward it becomes stuck at the same point, then it is likely that the pipe ...

  4. Hose clamp - Wikipedia

    en.wikipedia.org/wiki/Hose_clamp

    The clamp is put around the hose or tube to be connected, with the loose end being fed into a narrow space between the band and the captive screw. When the screw is turned, it acts as a worm drive pulling the threads of the band, causing the band to tighten around the hose (or when screwed the opposite direction, to loosen). Screw clamps are ...

  5. Breaker bar - Wikipedia

    en.wikipedia.org/wiki/Breaker_bar

    Breaker bar. A breaker bar (also known as a power bar) is a long non-ratcheting bar that is used with socket wrench-style sockets.They are used to break loose very tight fasteners because their additional length allows the same amount of force to generate significantly more torque than a standard length socket wrench.

  6. Fastener - Wikipedia

    en.wikipedia.org/wiki/Fastener

    There are three major steel fasteners used in industries: stainless steel, carbon steel, and alloy steel. The major grade used in stainless steel fasteners: 200 series, 300 series, and 400 series. Titanium, aluminium, and various alloys are also common materials of construction for metal fasteners.

  7. Trapezoidal thread form - Wikipedia

    en.wikipedia.org/wiki/Trapezoidal_thread_form

    The Acme thread was developed in 1894 as a profile well suited to power screws that has various advantages over the square thread, [note 1] which had been the form of choice until then. It is easier to cut with either single-point threading or die than the square thread is (because the latter's shape requires tool bit or die tooth geometry that ...

  8. NASA finally unlocks asteroid sample trapped behind stuck ...

    www.aol.com/news/nasa-unlocks-remainder-asteroid...

    The space agency worked for months to develop tools capable of opening stubborn fasteners that had trapped material collected from the near-Earth asteroid Bennu. NASA finally unlocks asteroid ...

  9. Screw thread - Wikipedia

    en.wikipedia.org/wiki/Screw_thread

    Fasteners such as wood screws, plastic screws, machine screws, nuts, and bolts. Connecting threaded pipes and hoses to each other and to caps and fixtures. Gear reduction via worm drives; Moving objects linearly by converting rotary motion to linear motion, as in the leadscrew of a jack.

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