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  2. National pipe thread - Wikipedia

    en.wikipedia.org/wiki/National_pipe_thread

    [4] The taper rate for all NPT threads is 1 inch of diameter in 16 inches of length (34 inch per foot or 62.5 millimeters per meter) measured by the change of diameter (of the pipe thread) over distance of thread.

  3. Multilevel groundwater monitoring systems - Wikipedia

    en.wikipedia.org/wiki/Multilevel_groundwater...

    The ports are connected using 3/4" NPT stainless couplings and 3/4" NPT steel drive pipe extensions. A Drive-Point Tip threads onto the first extension, or port, to be driven into the ground. The ports have a dual barbed stem that allows the connection of either 3/8" OD or 1/4" OD polyethylene or PTFE-lined tubing to create up to 3 or 6 ...

  4. Piping and plumbing fitting - Wikipedia

    en.wikipedia.org/wiki/Piping_and_plumbing_fitting

    Piping or tubing is usually inserted into fittings to make connections. Connectors are assigned a gender, abbreviated M or F. An example of this is a "34-inch female adapter NPT", which would have a corresponding male connection of the same size and thread standard (in this case also NPT).

  5. 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 ...

  6. List of drill and tap sizes - Wikipedia

    en.wikipedia.org/wiki/List_of_drill_and_tap_sizes

    Many thread sizes have several possible tap drills, because they yield threads of varying thread depth between 50% and 100%. Usually thread depths of 60% to 75% are desired. People frequently use a chart such as this to determine the proper tap drill for a certain thread size or the proper tap for an existing hole.

  7. Engineering drawing abbreviations and symbols - Wikipedia

    en.wikipedia.org/wiki/Engineering_drawing...

    Naval Primary Standard [3] (Not to be confused with annotating strait pipe as "NPS", which should instead be annotated NPSM, NPSL, or NPSH [4]) NPT: National Pipe Taper: A subset series of the Unified Thread Standard. NS: National Special; near side: 1. National Special, a screw thread series; see Unified Thread Standard. An extensible series ...

  8. Screw thread - Wikipedia

    en.wikipedia.org/wiki/Screw_thread

    For example, tables of caliper measurements show 0.69 female ID and 0.75 male OD for the standards of "3/4 SAE J512" threads and "3/4-14 UNF JIS SAE-J514 ISO 8434-2". [6] Note the female threads are identified by the corresponding male major diameter (3/4 inch), not by the actual measurement of the female threads.

  9. 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.

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