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  2. Fine adjustment screw - Wikipedia

    en.wikipedia.org/wiki/Fine_adjustment_screw

    A fine adjustment screw is a screw with threads between 40 and 100 threads per inch (TPI); 0.5–0.2 mm pitch. An ultra-fine adjustment screw has 100–508 TPI (0.2–0.05 mm pitch). Even though these are non-standard threads, both ISO metric screw thread designations and UNC designations have been used to call out thread dimensions and fit .

  3. Rack unit - Wikipedia

    en.wikipedia.org/wiki/Rack_unit

    Rack with sample component sizes including an A/V half-rack unit. A rack unit (abbreviated U or RU) is a unit of measure defined as 1 + 3 ⁄ 4 inches (44.45 mm). [1] [2] It is most frequently used as a measurement of the overall height of 19-inch and 23-inch rack frames, as well as the height of equipment that mounts in these frames, whereby the height of the frame or equipment is expressed ...

  4. Micrometer (device) - Wikipedia

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

    A screw's lead is the distance it moves forward axially with one complete turn (360°). (In most threads [that is, in all single-start threads], lead and pitch refer to essentially the same concept.) With an appropriate lead and major diameter of the screw, a given amount of axial movement will be amplified in the resulting circumferential ...

  5. M42 lens mount - Wikipedia

    en.wikipedia.org/wiki/M42_lens_mount

    The M42 lens mount is a screw thread mounting standard for attaching lenses to 35 mm cameras, primarily single-lens reflex models. It is more accurately known as the M42 × 1 mm standard, which means that it is a metric screw thread of 42 mm diameter and 1 mm thread pitch.

  6. Lens mount - Wikipedia

    en.wikipedia.org/wiki/Lens_mount

    1 mm Screw Photography Praktiflex: 44 mm 35 mm: M40: 1 mm Screw Photography Praktica: 44.40 mm 35 mm: 42 mm Bayonet Photography Exakta, Topcon RE: 44.7 mm 35 mm: 46 mm Bayonet Photography Zenit M39: 45.2 mm 35 mm: M39: 1 mm Screw Photography M37 45.46 mm 35 mm: 37 mm 1 mm Screw Photography Asahiflex: M42: 45.46 mm 35 mm: 42 mm 1 mm Screw ...

  7. Microphone stand - Wikipedia

    en.wikipedia.org/wiki/Microphone_stand

    Commonly used screw threads (from large to small) are: 5 ⁄ 8 in (16 mm) 27 threads per inch (tpi) Unified Special thread (UNS, U.S. and the rest of the world) 1 ⁄ 2 in (13 mm) 12 threads per inch (tpi) BSW used in older German and European stands; 3 ⁄ 8 in (9.5 mm) 16 threads per inch (tpi) BSW (uncommon in the U.S., used in the rest of ...

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