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SpeedShopUK has created this guide by reworking images and text that were originally downloaded from
XRP
Please Note: Due to internet browser and printing differences please use the diagram as a comparative scale guide between the sizes only.
NPT Thread Sizes
Use the figures below to determine the NPT
thread size. The table shows the corresponding thread size, threads per inch, inner diameter and closest AN
fitting size for each.
 |
| 1/8” |
27 |
1/8” |
4 |
| 3/8” |
18 |
3/8” |
8 |
| 1/2” |
14 |
1/2” |
10 |
| 3/4” |
14 |
3/4” |
12 |
| 1” |
11-1/2 |
1” |
16 |
| 1-1/4” |
11-1/2 |
1-1/4” |
20 |
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