Fittings & Fitments

Meaning: 
An Elbow pipe fitting having a female fitment and a male fitment. F-NPT by M-NPT -or- F-BSPT by M-BSPT
Meaning: 
Aerospace Industries Association

AIA is the body that authors the NAS standards. 

Meaning: 
Air Corp

Meaning: 
Air Force-Navy or Army-Navy (no one seems sure of which)

AN, AND, MS, AS

2019
See also: 
Meaning: 
Air Force-Navy Design Standard

AND is a sometimes-used synonym for AN. 

  • An AND fitting is an AN fitting.

For a thorough description, please refer to the glossary item, "AN" (link above).

Meaning: 
Flare Nut; The nut that maintains the attachment of a flare fitting.
Meaning: 
O-Ring Face Seal

ORFS is used primarily in Industrial Hydraulics. Like ORB (O-Ring Boss), it uses an o-ring for the seal.

Meaning: 
Sexless fire hose coupling

The following is from Wikipedia

Meaning: 
Same as BSPT, R

The Rc thread is a designation for BSPT (British Standard Pipe Taper).  For example,

Rc 1/4

Meaning: 
Same as BSPT

The R thread is a designation for BSPT (British Standard Pipe Taper).  For example,

R1/4

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