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Flare fittings
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| NPT-ThreadSizes.htm | |||
| Nom. Tube OD Inch | 37° Flare Straight Thread | Nom. Pipe Size Inch | SAE St. Threads Union and Bulkhead | Fittings with Pipe Thread |
|---|---|---|---|---|
| 1/8 | 5/16 x 24 | 1/8 | 5000 | 5000 |
| 3/16 | 3/8 x 24 | 1/8 | 5000 | 5000 |
| 1/4 | 7/16 x 20 | 1/8 | 5000 | 5000 |
| 5/16 | 1/2 x 20 | 1/8 | 5000 | 5000 |
| 3/8 | 9/16 x 18 | 1/4 | 5000 | 5000 |
| 1/2 | 3/4 x 16 | 3/8 | 4500 | 4000 |
| 5/8 | 7/8 x 14 | 1/2 | 3500 | 3000 |
| 3/4 | 7-1/76 x 12 | 3/4 | 3500 | 3000 |
| 7/8 | 1-3/16 x 12 | 3/4 | 3000 | 2500 |
| 1 | 1-5/16 x 12 | 1 | 3000 | 2000 |
Japanese Industrial Standard JIS 300 Flare
The male half has a 30° seat with a straight thread, while the female has a 300 seat with a straight thread as well. This connection and the 37° Flare are alike, however it's 30° seat and BSPP-like thread dimensions make it different from the American 37° Flare.
| Inch size | Dash size | Thread Size | Male Thread O.D. (in) | Female thread O.D (in) | ||
| 1⁄8 | -2 | 1⁄8 - 28 | 3⁄8 | 0.38 | 11⁄32 | 0.35 |
| 1⁄4 | -4 | 1⁄4 - 19 | 33⁄64 | 0.52 | 15⁄32 | 0.47 |
| 3⁄8 | -6 | 3⁄8 - 19 | 21⁄32 | 0.65 | 19⁄32 | 0.60 |
| 1⁄2 | -8 | 1⁄2 - 14 | 13⁄16 | 0.82 | 3⁄4 | 0.75 |
| 5⁄8 | -10 | 5⁄8 - 14 | 7⁄8 | 0.88 | 13⁄16 | 0.80 |
| 3⁄4 | -12 | 3⁄4 - 14 | 1 1⁄32 | 1.04 | 31⁄32 | 0.97 |
| 1 | -16 | 1 - 11 | 1 5⁄16 | 1.30 | 1 7⁄32 | 1.22 |
| 1 1⁄4 | -20 | 1 1⁄4 - 11 | 1 21⁄32 | 1.65 | 1 9⁄16 | 1.56 |
| 1 1⁄2 | -24 | 1 1⁄2 - 11 | 1 7⁄8 | 1.88 | 1 25⁄32 | 1.79 |
| 2 | -32 | 2 - 11 | 2 11⁄32 | 2.35 | 2 1⁄4 | 2.26 |