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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. List of drill and tap sizes - Wikipedia

    en.wikipedia.org/wiki/List_of_drill_and_tap_sizes

    Regarding the proportion of tap drill to thread major diameter, for standard V threads (ISO V thread and UTS V thread), there are several rules of thumb with strong predictive power: A good tap drill is 85% (± 2 pp ) of major diameter for coarse threads, and 90% (± 2 pp ) of major diameter for fine threads.

  4. List of thread standards - Wikipedia

    en.wikipedia.org/wiki/List_of_thread_standards

    Microscope Objective Thread: V Thread Form ASME B1.13M-2005 (R2015) Metric Screw Threads: M Profile: V Thread Form ASME B1.15-1995 (R2003) Unified Inch Screw Threads (UNJ Thread Form) V Thread Form ASME B1.20.1-2013: Pipe Threads, General Purpose (Inch) Pipe Thread Form ANSI B1.20.3-1976 (R2013) Dryseal Pipe Threads (Inch) Pipe Thread Form

  5. 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 ...

  6. Buttress thread - Wikipedia

    en.wikipedia.org/wiki/Buttress_thread

    In oil field tubing, buttress thread is a pipe thread form designed to provide a tight hydraulic seal. The thread form is similar to that of Acme thread [10] but there are two distinct threaded portions of differing diameters and profiles, the larger having a wedging profile, with a tapered sealing portion in between the larger and smaller diameters.

  7. Pipe (fluid conveyance) - Wikipedia

    en.wikipedia.org/wiki/Pipe_(fluid_conveyance)

    The most common pipe thread in North America is the National Pipe Thread (NPT) or the Dryseal (NPTF) version. Other pipe threads include the British Standard Pipe Thread (BSPT), the garden hose thread (GHT), and the fire hose coupling (NST). Copper pipes are typically joined by soldering, brazing, compression fittings, flaring, or crimping.

  8. Talk:National pipe thread - Wikipedia

    en.wikipedia.org/wiki/Talk:National_pipe_thread

    Stephen Charles Thompson 17:57, 30 December 2008 (UTC) NPT is the acronym for national pipe taper which is 3/4"/ft. NPTF is the acronym for national pipe taper fuel. The threads are the same basic dimension as NPT, but minor differences allow the threads to "bottom out" diametrically which creates a dry fit seal without using any sealing ...

  9. Threading (manufacturing) - Wikipedia

    en.wikipedia.org/wiki/Threading_(manufacturing)

    In manufacturing, threading is the process of creating a screw thread.More screw threads are produced each year than any other machine element. [1] There are many methods of generating threads, including subtractive methods (many kinds of thread cutting and grinding, as detailed below); deformative or transformative methods (rolling and forming; molding and casting); additive methods (such as ...

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