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  2. Screw thread - Wikipedia

    en.wikipedia.org/wiki/Screw_thread

    A screw thread is a helical structure used to convert between rotational and linear movement or force. A screw thread is a ridge wrapped around a cylinder or cone in the form of a helix, with the former being called a straight thread and the latter called a tapered thread. A screw thread is the essential feature of the screw as a simple machine ...

  3. Thread pitch gauge - Wikipedia

    en.wikipedia.org/wiki/Thread_pitch_gauge

    A thread gauge, [1] also known as a screw gauge[2] or pitch gauge, [3] is used to measure the pitch or lead of a screw thread. Thread pitch gauges are used as a reference tool in determining the pitch of a thread that is on a screw or in a tapped hole. This tool is not used as a precision measuring instrument, rather it allows the user to ...

  4. Lead (engineering) - Wikipedia

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

    Lead is the axial advance of a helix or screw during one complete turn (360°) [1] The lead for a screw thread is the axial travel for a single revolution. [2] Pitch is defined as the axial distance between adjacent threads on a helix or screw. In most screws, called " single start " screws, which have a single helical thread along their length ...

  5. 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 ...

  6. ISO metric screw thread - Wikipedia

    en.wikipedia.org/wiki/ISO_metric_screw_thread

    Designation. A metric ISO screw thread is designated by the letter M followed by the value of the nominal diameter D (the maximum thread diameter) and the pitch P, both expressed in millimetres and separated by a dash or sometimes the multiplication sign, × (e.g. M8-1.25 or M8×1.25). If the pitch is the normally used "coarse" pitch listed in ...

  7. British Standard Whitworth - Wikipedia

    en.wikipedia.org/wiki/British_Standard_Whitworth

    British Standard Whitworth. British Standard Whitworth (BSW) is an imperial-unit -based screw thread standard, devised and specified by Joseph Whitworth in 1841 and later adopted as a British Standard. It was the world's first national screw thread standard, and is the basis for many other standards, such as BSF, BSP, BSCon, and BSCopper.

  8. Gauge (instrument) - Wikipedia

    en.wikipedia.org/wiki/Gauge_(instrument)

    a device used to measure the strain of an object. Thread pitch gauge, also called a threading gauge, pitch gauge, or screw gauge a device used to measure the pitch or lead of screw threads. Vernier height gauge: a measuring device used either for determining the height of something, or for repetitious marking of items to be worked on.

  9. Screw - Wikipedia

    en.wikipedia.org/wiki/Screw

    The tapped hole (or nut) into which the screw fits, has an internal diameter which is the size of the screw minus the pitch of the thread. Thus, an M6 screw, which has a pitch of 1 mm, is made by threading a 6 mm shank, and the nut or threaded hole is made by tapping threads into a hole of 5 mm diameter (6 mm − 1 mm).