American National Pipe Designations:

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

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 Fire Hose Connections and is defined by NFPA 1963. Some of the sizes have been moved to NPSH.

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 NPTF 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 Loose is used for 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.

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.

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