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American National Pipe Designations

American National Pipe Designations:

ANPT = Aeronautical National Pipe Taper is very similar NPT and is defined in: ANSI/ASME SAE AS71051.

FNPT = Female National Pipe Thread. Do not use this designation. This designation is not found in any standard, but is being used in some sales catalogs of companies located outside of the USA, to designate Female NPT. This is a totally erroneous practice. I would think twice of purchasing from any company which uses this designation in their sales literature. If they did not take the time to learn and correctly designate the thread in their sales literature, how much time do you think they have taken to learn how to correctly manufacture the product thread.

FPT = Female Pipe Thread. Do not use this designation. This designation is not found in any standard, but is being used in some sales catalogs of companies located outside of the USA, to designate Female NPT. This is a totally erroneous practice. I would think twice of purchasing from any company which uses this designation in their sales literature. If they did not take the time to learn and correctly designate the thread in their sales literature, how much time do you think they have taken to learn how to correctly manufacture the product thread.

NGO = National Gas Outlet is used in safety critical gas connections and is defined by ANSI/ASME CGA V-1.

NGT = National Gas Taper is used in safety critical gas connections and is defined by ANSI/ASME CGA V-1.

NH = National Hose is used in Garden Hose and Fire Hose Connections and is defined by NFPA 1963 and also by ANSI/ASME B1.20.7. Some of the sizes have been moved to NPSH.

NHR = National Hose (Rolled or Round) is used in Garden Hose Connections and is defined by ANSI/ASME B1.20.7.

NPS = National Pipe Straight. This is not enough definition. See below where NPS is followed with a fourth letter (C; F; H; I; L; M). This fourth letter points us to the specific standard which defines the specific thread parameters. Without the fourth letter the minimum and maximum pitch diameters are required in association with the NPS designation, pipe size and threads-per-inch to fully define the thread size.

NPSC = National Pipe Straight Coupling is used as hose coupling screw threads and is defined by ANSI/ASME B1.20.1.

NPSF = National Pipe Straight Fuel is used in Dry Seal Applications and is defined in ANSI/ASME B1.20.3. The NPSF gages are defined in ANSI/ASME B1.20.5.

NPSH = National Pipe Straight Hose is used as hose coupling screw threads and is defined by ANSI/ASME B1.20.7.

NPSI = National Pipe Straight Intermediate is defined by ANSI/ASME B1.20.3.

NPSL = National Pipe Straight Loocknut (or Loose) is used for Locknut applications or Loose-Fitting Mechanical Joint screw threads and is defined by ANSI/ASME B1.20.1.

NPSM = National Pipe Straight Mechanical is the most common Pipe Mechanical Joint screw threads and is defined by ANSI/ASME B1.20.1.

NPT = National Pipe Taper is for non critical applications and is defined by: ANSI/ASME B1.20.1.

NPTF = National Pipe Taper Fuel is also known as a Dry Seal and is defined in ANSI/ASME B1.20.3. The NPTF gages are defined in ANSI/ASME B1.20.5.

MNPT = Male National Pipe Thread. Do not use this designation. This designation is not found in any standard, but is being used in some sales catalogs of companies located outside of the USA, to designate Male NPT. This is a totally erroneous practice. I would think twice of purchasing from any company which uses this designation in their sales literature. If they did not take the time to learn and correctly designate the thread in their sales literature, how much time do you think they have taken to learn how to correctly manufacture the product thread.

MPT = Male Pipe Thread. Do not use this designation. This designation is not found in any standard, but is being used in some sales catalogs of companies located outside of the USA, to designate Male NPT. This is a totally erroneous practice. I would think twice of purchasing from any company which uses this designation in their sales literature. If they did not take the time to learn and correctly designate the thread in their sales literature, how much time do you think they have taken to learn how to correctly manufacture the product thread.

PTF SAE Short = Pipe Taper Fuel is a shortened version of NPTF/Dry Seal and is defined in ANSI/ASME B1.20.3. The PTF SAE Short gages are defined in ANSI/ASME B1.20.5.

PTF SPL Short = Pipe Taper Fuel is a shortened version of NPTF/Dry Seal and is defined in ANSI/ASME B1.20.3. The PTF SPL Short gages are defined in ANSI/ASME B1.20.5.

PTF SPL Extra Short = Pipe Taper Fuel is a shortened version of NPTF/Dry Seal and is defined in ANSI/ASME B1.20.3. The PTF SPL Extra Short gages are defined in ANSI/ASME B1.20.5.

Disclaimer:
This data is provided for general information only. The intention is to provide accurate information; regardless; errors may exist in the supplied information. If accuracy is critical, base your final decisions on the data provided in the root document which is likely a copyrighted document. To purchase a copy visit an Authorized Reseller.  

Comments:
Original Posting: 12/17/2008
Last Revised: 7/9/2015
Comments about the above statements can be sent to: gageguy@gagecrib.com

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