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2. National pipe thread - Wikipedia

   en.wikipedia.org/wiki/National_pipe_thread

   The taper rate for all NPT threads is 1 inch of diameter in 16 inches of length (3 ⁄ 4 inch per foot or 62.5 millimeters per meter) measured by the change of diameter (of the pipe thread) over distance of thread.

3. British Standard Pipe - Wikipedia

   en.wikipedia.org/wiki/British_Standard_Pipe

   the words, Pipe thread, the document number of the standard (e.g., ISO 7 or EN 10226) the symbol for the pipe thread type: G, external and internal parallel (ISO 228) R, external taper (ISO 7) Rp, internal parallel (ISO 7/1) Rc, internal taper (ISO 7) Rs, external parallel; the thread size; Threads are normally right-hand.

4. List of thread standards - Wikipedia

   en.wikipedia.org/wiki/List_of_thread_standards

   Dryseal Pipe Threads (Inch) Pipe Thread Form ASME B1.20.7-1991 (R2013) Hose Coupling Screw Threads - Inch: Pipe Thread Form ASME B1.21M-1997 (R2013) Metric Screw Threads - MJ Profile: V Thread Form BS 84: Tables of BS Whitworth, BS Fine and BS Pipe Threads: V Thread Form (55°) 1 ⁄ 4 ″-20 BSW ISO 68-1:1998: ISO general purpose screw threads ...

5. Nominal Pipe Size - Wikipedia

   en.wikipedia.org/wiki/Nominal_Pipe_Size

   Nominal Pipe Size (NPS) is a North American set of standard sizes for pipes used for high or low pressures and temperatures. [1] " Nominal" refers to pipe in non-specific terms and identifies the diameter of the hole with a non-dimensional number (for example – 2-inch nominal steel pipe" consists of many varieties of steel pipe with the only criterion being a 2.375-inch (60.3 mm) outside ...

6. List of DIN standards - Wikipedia

   en.wikipedia.org/wiki/List_of_DIN_standards

   Pipe threads for tubes and fittings; sizes for taper screw limit plug gauges for parallel internal thread: Withdrawn: DIN EN 10226-3: EN 10226-3: DIN 2999-5: Whitworth Pipe Threads for Tubes and Fittings; Cylindrical Screw Limit Ring Gauges for Gauging Conical External Threads, Sizes: Withdrawn: DIN EN 10226-3: EN 10226-3: DIN 2999-6

7. Unified Thread Standard - Wikipedia

   en.wikipedia.org/wiki/Unified_Thread_Standard

   The letter suffix "A" or "B" denotes whether the threads are external or internal, respectively. Classes 1A, 2A, 3A apply to external threads; Classes 1B, 2B, 3B apply to internal threads. [11] Thread class refers to the acceptable range of pitch diameter for any given thread. The pitch diameter is indicated as Dp in the figure shown above.

8. Threaded pipe - Wikipedia

   en.wikipedia.org/wiki/Threaded_pipe

   A threaded pipe is a pipe with ... Both British standard and National pipe thread standards specify a thread taper of 1:16; the change in diameter is one sixteenth ...

9. British Standard Whitworth - Wikipedia

   en.wikipedia.org/wiki/British_Standard_Whitworth

   These threads are designated by a number between 1/16 and 6 that originates from the nominal internal diameter (i/d) in inches of a steel pipe for which these threads were designed. These pipe thread designations do not refer to any thread diameter. Other threads that used the Whitworth 55° angle include Brass Threads, British Standard Conduit ...