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SpeedShopUK has created this guide by reworking images and text that were originally downloaded from
Earls Performance Products
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
National
Pipe Threads are the next most popular thread size used in “Competition Plumbing.” We can actually find a resemblance
between the size call outs and the I.D. (inside diameter) of the fitting as shown in the chart below.
Some of the most popular adapter fittings
shown in our catalog are AN to
NPT adapters. While many variations
are offered, column four in the chart
shows which AN size corresponds to
each NPT size when inside diameters
(flow dimensions) are considered.
All Earl’s Swivel-Seal™ hose ends are
designed to provide little or no restriction
when used with the corresponding
AN fitting size.
We also offer a number of Metric
threads to AN fitting adapters.
| 1/16" |
27 |
1/16” |
- |
| 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 |
| 1-1/2” |
11-1/2 |
1-1/2” |
24 |
| 1-1/4” |
11-1/2 |
2” |
32 |
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