7/8 27 Tpi Coupler

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Threaded pipe and elbow. The pipe has a male NPT thread, while the elbow is female.

American National Standard Pipe Thread standards, often called national pipe thread standards for short, are U.S. national technical standards for screw threads used on threaded pipes and pipe fittings. They include both tapered and straight thread series for various purposes including rigidity, pressure-tight sealing, or both.[1] The various types are each named with a symbol and a full name; examples of the symbols include NPT, NPS, NPTF, NPSC, and others.

MIP is an acronym for male iron pipe, and FIP is an acronym for female iron pipe.[2]

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Outside the United States, some US pipe threads are found, as well as many British Standard Pipe threads and ISO 7-1, 7-2, 228-1, and 228-2 threads.

  • 3Specifications
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Types[edit]

The various types are each named with a symbol and a full name, as follows:[3]

Abbreviation[3]Shorthand expansionFull name[3]Comment[3]
NPTNational pipe taperAmerican National Standard Taper Pipe ThreadTapered for sealing, often without any thread sealant; for connections in nearly every type of service
NPSNational pipe straightAmerican National Standard Straight Pipe ThreadFor rigidity; sealable only with sealant; sometimes male straight enclosed by female tapered for low-pressure sealing
NPSCNational pipe straight–couplingAmerican National Standard Straight Pipe Thread for CouplingsFor general couplings
NPSFNational pipe straight–fuelDryseal USA (American) Standard Fuel Internal Straight Pipe ThreadInternal only, straight
NPSHNational pipe straight–hoseAmerican National Standard Straight Pipe Thread for Hose CouplingsFor hose couplings
NPSINational pipe straight–intermediateDryseal USA (American) Standard Intermediate Internal Straight Pipe ThreadSimilar to NPSF but slightly larger; internal only, straight
NPSLNational pipe straight–locknutAmerican National Standard Straight Pipe Thread for Loose-fitting Mechanical Joints with LocknutsFor use with locknuts
NPSMNational pipe straight–mechanicalAmerican National Standard Straight Pipe Thread for Free-fitting Mechanical JointsFor various rigid mechanical uses
NPTFNational pipe taper–fuelDryseal USA (American) Standard Taper Pipe ThreadFor dryseal connections in nearly every type of service, especially fuel connections
NPTRNational pipe taper–railingAmerican National Standard Taper Pipe Thread for Railing JointsFor railings
PTF-SAE SHORTPipe taper, fuel, SAE, shortDryseal SAE Short Taper Pipe ThreadNamed after SAE International; similar to NPTF but one turn shorter

Use[edit]

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Threaded pipes can provide an effective seal for pipes transporting liquids, gases, steam, and hydraulic fluid. These threads are now used in materials other than steel and brass, including PTFE,[4]PVC, nylon, bronze, and cast iron.

The taper on NPT threads allows them to form a seal when torqued as the flanks of the threads compress against each other, as opposed to parallel/straight thread fittings or compression fittings in which the threads merely hold the pieces together and do not provide the seal. The various types of pipe threads are designed for use both with or without thread sealants,[1] as particular applications demand. The sealants, where used, are typically thread seal tape or pipe dope (sometimes plumber's putty). As the thread body is tapered (0.75 in/ft or 62.5 mm/m), a larger diameter keeps compressing into a smaller diameter and finally forms a seal (no clearance remains between the crests and roots of the threads because of the taper). This means that NPT fittings should be burr-free and lubricated using a lubricant like lubricating paste or thread seal tape. The use of tape also helps to limit corrosion on the threads, which otherwise can make future disassembly nearly impossible.

Commonly used sizes are ​18, ​14, ​38, ​12, ​34, 1, ​114, ​112, and 2 inch, appearing on pipes and fittings by most U.S. suppliers. Sizes smaller than ​18 inch are occasionally used for compressed air, while sizes larger than 2 inches are uncommon, due to the use of alternative methods of joining that are used with these larger sizes.

Specifications[edit]

NPT is defined by ANSI/ASME standard B1.20.1.[5]

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. The angle between the taper and the center axis of the pipe is tan−1(​132) = 1.7899° = 1° 47′ 24″.

The standard for Nominal Pipe Size (often abbreviated NPS, which should not be confused with the symbol NPS for the straight thread form standard) is loosely related to the inside diameter of Schedule 40 series of sizes. Because of the pipe wall thickness of Schedule pipe, the actual diameter of the NPT threads is larger than the Nominal Pipe Size outside diameter, and considerably so for small sizes. Pipe of a given size in a different Schedule than Schedule 40 provides a different wall thickness, while maintaining the same outside diameter and thread profile as Schedule 40. Thus the inside diameter of a given size of Schedule pipe differs from the Nominal Pipe Size, while outside diameters for a given nominal Schedule size are the same between Schedules.

Thread form[edit]

NPT and NPS threads have a 60° included angle and have a Sellers thread form (flattened peaks and valleys).

National pipe taper fuel (NPTF)[edit]

National Pipe Taper Fuel (NPTF), also called Dryseal American National Standard Taper Pipe Thread, defined by ASME B1.20.3, is designed to provide a more leak-free seal without the use of PTFE tape (often referred to by the popular brand name 'Teflon') or other sealant compound. NPTF threads have the same basic shape but with crest and root heights adjusted for an interference fit, eliminating the spiral leakage path.

Standard sizes[edit]

American Society of Mechanical Engineers National Pipe Thread Taper (NPT)[6]
Nominal
pipe size
Thread
density
Thread pitchHand-tight engagement[7]Effective thread[7]Overall
length[7]
Actual outside
diameter, OD
Tap drill
LengthTurnsDiameterLengthTurnsDiameter
inchinch−1inchmminchinchinchinchinchinchmminchmm
116270.037037040.94070.16004.320.281180.26117.050.28750.38960.3137.950
18270.037037040.94070.16154.360.373600.26397.130.380000.39240.40510.2870.3398.6106
14180.055555551.41110.22784.100.491630.40187.230.502500.59460.54013.71671611.113
38180.055555551.41110.24004.320.627010.40787.340.637500.60060.67517.145376414.684
12140.071428571.81430.32004.480.778430.53377.470.791780.78150.84021.3360233218.2563
34140.071428571.81430.33904.750.988870.54577.641.001780.79351.05026.6700596423.4156
111120.086956522.20870.40004.601.238630.68287.851.256310.98451.31533.4010153229.3688
11411120.086956522.20870.42004.831.583380.70688.131.601311.00851.66042.164011238.1000
11211120.086956522.20870.42004.831.822340.72358.321.841311.02521.90048.26001476444.0531
211120.086956522.20870.43605.012.296270.75658.702.316301.05822.37560.3250273256.3563
21280.125000003.17500.68205.462.762161.13759.102.790631.57122.87573.025025866.6750
380.125000003.17500.76606.133.388501.20009.603.415631.63373.50088.900031482.5500
31280.125000003.17500.82106.573.888811.250010.003.915631.68374.000101.600033495.2500
480.125000003.17500.84406.754.387131.300010.404.415631.73374.500114.3000414107.9500
41280.125000003.17505.000127.0000434120.6500
580.125000003.17500.93707.505.449291.406311.255.478631.84005.563141.30025932134.1438
680.125000003.17500.95807.666.505971.512512.106.540631.94626.625168.275061132161.1313
880.125000003.17501.06308.508.500031.712513.708.540632.14628.625219.0750
1080.125000003.17501.21009.6810.620941.925015.4010.665632.358710.750273.0500
1280.125000003.17501.360010.8812.617812.125017.0012.665632.558712.750323.8500
1480.125000003.17501.562012.5013.872632.250018.0013.915632.683714.000355.6000
1680.125000003.17501.812014.5015.875752.450019.6015.915632.883716.000406.4000
1880.125000003.17502.000016.0017.875002.650021.2017.915633.083718.000457.2000
2080.125000003.17502.125017.0019.870312.850022.8019.915633.283720.000508.0000
2480.125000003.17502.375019.0023.860943.250026.0023.915633.683724.000609.6000
Hand-tight and effective thread engagement lengths

History[edit]

In 1864, William Sellers, the president of Franklin Institute, presented a standard for nuts, bolts, and screws. Out of this effort came the first United States Standard threads, including pipe threads.[8] (See also Screw thread § History of standardization.)

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See also[edit]

References[edit]

  1. ^ abMachinery's Handbook (1996), pp. 1772–1781.
  2. ^Cauldwell, Rex (2006). Plumbing. Newtown, CT: Taunton Press. ISBN1561588172.
  3. ^ abcdMachinery's Handbook (1996), pp. 1776–1778.
  4. ^http://www.micromold.com/threaded_piping.html PTFE threaded pipe and fittings manufacturer
  5. ^http://www.hemcogages.com/ansi.htm
  6. ^Engineering toolbox
  7. ^ abchttp://www.piping-designer.com/index.php/disciplines/mechanical/84-stationary-equipment/fastener/1156-national-pipe-thread?title=National_Pipe_Thread
  8. ^https://www.engineerily.com/1304161-bsp-and-npt-threads-detailed-explanation-differences.htm
7/8 27 Tpi Coupler

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Bibliography[edit]

  • Oberg, Erik; Jones, Franklin D.; Horton, Holbrook L.; Ryffel, Henry H. (1996), Green, Robert E.; McCauley, Christopher J. (eds.), Machinery's Handbook (25th ed.), New York, NY, USA: Industrial Press, ISBN978-0-8311-2575-2, OCLC473691581.

External links[edit]

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