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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.
At its annual convention at Dallas, TX, the NFPA formally adopted a standard with 2 + 1 ⁄ 2-inch hose with 7.5 threads per inch as the primary standard, with additional sizes of 3 and 3.5 inches (each with 6 threads per inch) and a 4.5 inch coupling with 4 threads per inch, with the fire hydrant standard specifying one 4.5 inch port and two 2 ...
Pipe Threads, General Purpose (Inch) 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 ...
The US standard was defined by NFPA 1963, "Standard for Fire Hose Connections", [2] then later by ANSI-ASME B1.20.7, [3] which specifies 1 + 1 ⁄ 16 inches (27 mm) diameter straight (non-tapered) thread with a pitch of 11.5 threads per inch (TPI). The female thread is abbreviated FHT (for "female hose thread"), and the male part is abbreviated ...
The standard designation for a UTS thread is a number indicating the nominal (major) diameter of the thread, followed by the pitch measured in threads per inch.For diameters smaller than 1 / 4 inch, the diameter is indicated by an integer number defined in the standard; for all other diameters, the inch figure is given.
The major minus pitch technique also works for inch-based threads, but you must first calculate the pitch by converting the fraction of threads-per-inch (TPI) into a decimal. For example, a screw with a pitch of 1/20 in (20 threads per inch) has a pitch of 0.050 in and a 1 ⁄ 13 in pitch (13 threads per inch) has a pitch of 0.077 in.
Royal Microscopical Society (RMS) thread, also known as society thread, is a special 0.8-inch diameter × 36 thread-per-inch (TPI) Whitworth thread form used for microscope objective lenses. Microphone stands: 5 ⁄ 8-inch 27 threads per inch (TPI) Unified Special thread (UNS, USA and the rest of the world)
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 ...