NPT

Glossary Term: NPT

Meaning: National Pipe Taper

Quick Search ► on the term "NPT"


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 tape for sealing.  NPT is a U.S. standard.

 
Pipe Size
Pitch  (Threads/Inch)
NPT/NPS
BSP
 1/16"
27
---
 1/8"
27
28
 1/4"
18
19
 3/8"
18
19
 1/2"
14
14
 5/8"
---
14

 
Pipe Size
Pitch  (Threads/Inch)
NPT/NPS
BSP
 3/4"
14
14
1"
11 1/2
11
1 1/4"
11 1/2
11
1 1/2"
11 1/2
11
2"
11 1/2
11
2 1/2"
8
11

 
Pipe Size
Pitch  (Threads/Inch)
NPT/NPS
BSP
3"
8
11
3 1/2"
8
11
4"
8
11
5"
8
11
6"
8
11
8"
8
---