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Threaded Plumbing Fitting Identification Guide

How to identify AN, NPT and BSP plumbing fittings.

AN (JIC) 37° Flare Fittings
(same thread used on O-ring ports)
Typical AN (JIC) 37° Male Fitting Profile
 
AN Size
Thread Size
3AN 3/8 - 24
4AN 7/16 - 20
6AN 9/16 - 18
8AN 3/4 - 16
10AN 7/8 - 14
12AN 1 1/16 - 12
16AN 1 5/16 - 12

 
NPT Pipe Fittings (tapered thread)
(American Standard Pipe)
Typical NPT Male Fitting Profile
 
Nominal Size
Approx. Dia. at
middle of taper
Threads per inch
1/8 NPT 0.40 inch 27
1/4 NPT 0.53 inch 18
3/8 NPT 0.67 inch 18
1/2 NPT 0.83 inch 14
3/4 NPT 1.04 inch 14
1" NPT 1.30 inch 11 1/2

 
BSP Pipe Fittings (straight thread)
(British Standard Pipe)
Typical BSP Male Fitting Profile
 
Nominal Size
Thread Diameter
Threads per inch
1/8 BSP 0.38 inch 28
1/4 BSP 0.51 inch 19
3/8 BSP 0.66 inch 19
1/2 BSP 0.81 inch 14
5/8 BSP 0.90 inch 14
3/4 BSP 1.04 inch 14

 
Plumbing Products - Major Product Category

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