Fittings & Fitments

Meaning: 
National Standard Thread

NST (National Standard Thread) is a definition of actual diametral thread dimensions and pitches for various fittings for adapting nominal hose and pipe sizes.

Meaning: 
National Pipe Taper Railing

NPTR thread is used on stair banister railings and similar mechanical applications.  They are not intended for fluid coupling or piping applications.

Meaning: 
National Pipe Taper

NPT (National Pipe Taper) is a tapered pipe thread used for mechanical joints or where fluid sealing is accomplished at the thread interface.  NPT threads require a joint sealing compond or joint t

Meaning: 
National Pipe Straight Mechanical
Meaning: 
National Pipe Straight Locknut
Meaning: 
National Pipe Straight Hose
Meaning: 
National Pipe Straight

NPS (National Pipe Straight) is a straight thread used for mechanical joints or where fluid sealing is accomplished by an o-ring or washer at the base of the threads.  NPS is a U.S. standard.

Meaning: 
National Hose

NH (National Hose) is a definition of actual diametral thread dimensions and pitches for various fittings for adapting nominal hose and pipe sizes.

Meaning: 
National Aerospace Standard
Meaning: 
Male Pipe Taper (NPT)

MPT is a comonly used shorthand designation for Male Pipe Taper (Male NPT).

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