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Pipe & Tubing Size Help

To assist you in finding the parts that are right for you, we've compiled a list of terms that are commonly used to describe plumbing pipes, tubes, and fittings.
Abbreviations:
OD: The Outside Diameter of tube or pipe. OD for pipes remains constant regardless of what weight or grade of pipe is used.
ID: The Inside Diameter of tube or pipe.
IPS: Stands for Iron Pipe Size. Commonly used to measure brass and galvanized piping. Sized at the fitting, by its Inside Diameter.
FIP: Female Iron Pipe. Threaded on the inside of the pipe.
MIP: Male Iron Pipe. Threaded on the outside of the pipe.
NPT: National Pipe Thread. Tapered pipe used on threaded pipes and fittings.
Sizes and Conversions for Brass Pipe:
1/16" ID
=
0.31" OD  
1/8" ID
=
0.41" OD  
1/4" ID
=
0.54" OD  
3/8" ID
=
0.68" OD  
1/2" ID
=
0.84" OD  
3/4" ID
=
1.05" OD  
1" ID
=
1.32" OD  
1-1/4" ID
=
1.66" OD  
1-1/2" ID
=
1.90" OD  
2" ID
=
2.37" OD  
2-1/2" ID
=
2.87" OD  
3" ID
=
3.50" OD  
   

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