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  2. Trapezoidal thread form - Wikipedia

    en.wikipedia.org/wiki/Trapezoidal_thread_form

    Basic Acme thread profile. The Acme thread form has a 29° thread angle with a thread height half of the pitch; the apex (or crest) and valley (or root) are flat.This shape is easier to machine (faster cutting, longer tool life) than a square thread.

  3. Perm (hairstyle) - Wikipedia

    en.wikipedia.org/wiki/Perm_(hairstyle)

    There are two parts to a perm: the physical action of wrapping the hair, and the chemical phase. Both of these can affect the result. Important physical variables involved are what type of rod is used, how the hair is wrapped and how end papers are used. The two most common types of rods are straight and concave; each giving a different curl ...

  4. British Standard Pipe - Wikipedia

    en.wikipedia.org/wiki/British_Standard_Pipe

    British Standard Pipe (BSP) is a set of technical standards for screw threads that has been adopted internationally for interconnecting and sealing pipes and fittings by mating an external thread with an internal (female) thread.

  5. List of drill and tap sizes - Wikipedia

    en.wikipedia.org/wiki/List_of_drill_and_tap_sizes

    For both of these rules of thumb (85%/90% and major minus pitch), the tap drill size yielded is not necessarily the only possible one, but it is a good one for general use. The 85% and 90% rules works best in the range of 1 ⁄ 4 –1 in (6.4–25.4 mm), the sizes most important on many shop floors. Some sizes outside that range have different ...

  6. JST connector - Wikipedia

    en.wikipedia.org/wiki/JST_connector

    It is very common in blogs and websites to incorrectly name a specific connector only by the name of the manufacturer. To minimize confusion, it is best to describe a connector using: the manufacturer's name, exact connector series, and optionally the pitch, such as "JST-XH" or "JST-XH-2.50mm" or "2.50mm JST XH-series" or other variations.

  7. IEC 60309 - Wikipedia

    en.wikipedia.org/wiki/IEC_60309

    The pilot pin is located in the centre of main contact circle on 4- and 5-pin connectors. On 3-pin (2P+E) connectors, it is located on the contact circle opposite the ground pin. The other connectors are located 105° on either side of the earth pin, rather than 120° as in the smaller variants, to make room for the pilot pin.

  8. Threaded rod - Wikipedia

    en.wikipedia.org/wiki/Threaded_rod

    A threaded rod, also known as a stud, is a relatively long rod that is threaded on both ends; the thread may extend along the complete length of the rod. [1] They are designed to be used in tension. [2] Threaded rod in bar stock form is often called all-thread (ATR); other names include fully-threaded rod, redi-rod, continuously-threaded rod ...

  9. IEC metric screw sized connectors - Wikipedia

    en.wikipedia.org/wiki/IEC_metric_screw_sized...

    IEC metric screw sized connectors is a family of electrical connectors defined by IEC that are named according to their ISO metric screw thread, namely M5, M8 and M12. [1] The number gives their outer screw thread diameter in millimeters as with the identically named screws.

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