Editing National pipe thread (section)

==Types==
The various types are each named with an abbreviation and a full name, as follows:{{sfnp|Machinery's Handbook|1996|pages=1776–1778}}

{| class="wikitable sortable" border="1"
|-
! scope="col" style="width: 16%;" | Abbreviation{{sfnp|Machinery's Handbook|1996|pages=1776–1778}}
! scope="col" style="width: 25%;" | Shorthand expansion
! scope="col" style="width: 24%;" | Full name{{sfnp|Machinery's Handbook|1996|pages=1776–1778}}
! scope="col" style="width: 35%;" | Comment{{sfnp|Machinery's Handbook|1996|pages=1776–1778}}
|-
| NPT || National pipe taper || American National Standard Taper Pipe Thread || Tapered and needs thread sealant; for connections in nearly every type of service 
|-
| NPS || National pipe straight || American National Standard Straight Pipe Thread || For rigidity; sealable with o-ring or gasket; sometimes male straight is mated with female tapered for low-pressure sealing{{fact|date=February 2025}}
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| NPSC || National pipe straight–coupling ||  American National Standard Straight Pipe Thread for Couplings || For general [[coupling]]s
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| NPSF || National pipe straight–fuel and oil || Dryseal USA (American) Standard Fuel Internal Straight Pipe Thread  || Internal only, straight
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| NPSH || National pipe straight–hose || American National Standard Straight Pipe Thread for Hose Couplings || For [[hose coupling]]s 
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| NPSI || National pipe straight–intermediate || Dryseal USA (American) Standard Intermediate Internal Straight Pipe Thread || Similar to NPSF but slightly larger; internal only, straight
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| NPSL || National pipe straight–locknut ||  American National Standard Straight Pipe Thread for Loose-fitting Mechanical Joints with Locknuts || For use with [[locknut]]s
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| NPSM || National pipe straight–mechanical ||  American National Standard Straight Pipe Thread for Free-fitting Mechanical Joints || For various rigid mechanical uses 
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| NPTF || National pipe taper–fuel and oil || Dryseal USA (American) Standard Taper Pipe Thread || For dryseal connections in nearly every type of service, especially [[fuel]] connections
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| NPTR || National pipe taper–railing || American National Standard Taper Pipe Thread for Railing Joints  || For [[handrail|railing]]s
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| PTF-SAE SHORT || Pipe taper, fuel, SAE, short || Dryseal SAE Short Taper Pipe Thread || Named after [[SAE International]]; similar to NPTF but one turn shorter
|}