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  2. Jackscrew - Wikipedia

    en.wikipedia.org/wiki/Jackscrew

    The jack is inserting the bar (visible lower left) in the holes at the top and turning. A jackscrew , or screw jack , is a type of jack that is operated by turning a leadscrew . It is commonly used to lift moderate and heavy weights, such as vehicles; to raise and lower the horizontal stabilizers of aircraft; and as adjustable supports for ...

  3. Tripod (surveying) - Wikipedia

    en.wikipedia.org/wiki/Tripod_(surveying)

    Many modern tripods are constructed of aluminum, though wood is still used for legs. The feet are either aluminum tipped with a steel point or steel. The mounting screw is often brass or brass and plastic. The mounting screw is hollow and has two lateral holes to attach a plumb bob to center the instrument e.g. over a corner or other mark on ...

  4. Spacers and standoffs - Wikipedia

    en.wikipedia.org/wiki/Spacers_and_standoffs

    Size 4-40 is used to receive jackscrews securing cable connectors to external computer ports, and size 6-32 is used for motherboard mounts. Dell, Inc. refers to standoffs that receive thumbscrews as "hex nut screws" and measures them with the metric system .

  5. Tripod (photography) - Wikipedia

    en.wikipedia.org/wiki/Tripod_(photography)

    Per ISO 1222:2010, [1] the current tripod bolt thread standard for attaching the camera calls for a 1/4-20 UNC [2] or 3/8-16 UNC thread. [3] Most consumer cameras are fitted with 1/4-20 UNC threads. Larger, professional cameras and lenses may be fitted with 3/8-16 UNC threads, plus a removable 1/4-20 UNC adapter, allowing them to be mounted on ...

  6. Swivel - Wikipedia

    en.wikipedia.org/wiki/Swivel

    First of all, a threaded bar is inherently weaker than a solid bar of the same diameter. Then there is the issue of the welds not holding. When a boat swings on a well-embedded anchor, this can cause strong lateral loads on the swivel, causing its jaws to be pried open - thus disconnecting the chain from the swivel. Hence the above advice from ...

  7. Screw thread - Wikipedia

    en.wikipedia.org/wiki/Screw_thread

    Screw thread, used to convert torque into the linear force in the flood gate.The operator rotates the small vertical bevel gear in the center. Through mechanical advantage this causes the horizontal bevel gears (at far left and far right, with threaded center holes) to rotate.

  8. M39 lens mount - Wikipedia

    en.wikipedia.org/wiki/M39_lens_mount

    The M39 lens mount is a screw thread mounting system for attaching lenses to 35 mm cameras, primarily rangefinder (RF) Leicas. It is also the most common mount for Photographic enlarger lenses. True Leica Thread-Mount (LTM) is 39 mm in diameter and has a thread of 26 turns-per-inch or threads-per-inch (tpi) (approximately 0.977 mm pitch) of ...

  9. Jack (device) - Wikipedia

    en.wikipedia.org/wiki/Jack_(device)

    A 2.5-ton house jack that stands 24 inches from top to bottom fully threaded out. A house jack, also called a screw jack, is a mechanical device primarily used to lift buildings from their foundations for repairs or relocation. A series of jacks is used and then wood cribbing temporarily supports the structure. This process is repeated until ...

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