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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. 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. [9] 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.

4. List of thread standards - Wikipedia

   en.wikipedia.org/wiki/List_of_thread_standards

   Pipe Thread Form ANSI B1.20.3-1976 (R2013) 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 ...

5. 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.

6. AN thread - Wikipedia

   en.wikipedia.org/wiki/AN_thread

   For example, AN6 bolt has a 3 ⁄ 8-24 thread [3] whereas an -6 AN fitting has a 9 ⁄ 16-18 thread. [ 4 ] Originally parts were made compliant to the specification MIL-F-5509, but they are now controlled under SAE AS (Aerospace Standards) specifications AS4841 through AS4843 and AS4875.

7. Talk:National pipe thread - Wikipedia

   en.wikipedia.org/wiki/Talk:National_pipe_thread

   Does anyone have a good source on how to install NPT fittings? Evand 19:21, 8 February 2006 (UTC) The key standard is ANSI/ASME B1.20.1 "Pipe Threads, General Purpose (Inch)". Table 2 of that reference calls for 3 threads of make-up from hand-tight for pipes 2" and under (nominal), and 2 threads for pipes with nominal sizes over 2 inches.

8. Thread angle - Wikipedia

   en.wikipedia.org/wiki/Thread_angle

   National Pipe Thread NPT 60° ASME B1.20.-1983 Pipe Threads, General Purpose, Inch Knuckle thread [2] [3] [4] Round thread; Rd 30° [5] DIN 405 / DIN 20400 Acme ...

9. 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.