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| Size | Basic O.D. (Male Part) |
Threads (per inch) |
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Straight Pipe Thread (NPSH) |
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| 1/8 | .3990 | 27 |
| 1/4 | .5270 | 18 |
| 3/8 | .6640 | 18 |
| 1/2 | .8248 | 14 |
| 3/4 | 1.0353 | 14 |
| 1 | 1.291 | 11 1/2 |
| 1 1/4 | 1.6399 | 11 1/2 |
| 1 1/2 | 1.8788 | 11 1/2 |
| 2 | 2.3528 | 11 1/2 |
| 2 1/2 | 2.8410 | 8 |
| 3 | 3.4670 | 8 |
| 3 1/2 | 3.9680 | 8 |
| 4 | 4.4660 | 8 |
| 4 1/2 | 4.9850 | 8 |
| 5 | 5.5281 | 8 |
| 6 | 6.5848 | 8 |
| 8 | 8.5790 | 8 |
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*National Standard Thread (NH) |
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| 3/4 | 1.3750 | 8 |
| 1 | 1.3750 | 8 |
| 1 1/4 | 1.6718 | 9 |
| 1 1/2 | 1.9900 | 9 |
| 2 | 2.5156 | 8 |
| 2 1/2 | 3.0686 | 7 1/2 |
| 3 | 3.6239 | 6 |
| 3 1/2 | 4.2439 | 6 |
| 4 | 5.0109 | 4 |
| **4-SPL | 4.9082 | 6 |
| 4 1/2 | 5.7609 | 4 |
| 5 | 6.260 | 4 |
| 6 | 7.025 | 4 |
| Size | Basic O.D. (Male Part) |
Threads (per inch) |
|
New York City Fire Dept Thread (NYFD) |
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| 1 | 1.660 | 8 |
| 1 1/2 | 2.100 | 8 |
| 2 | 2.530 | 8 |
| 2 1/2 | 3.030 | 8 |
| 3 | 3.630 | 8 |
| 3 1/2 | 4.070 | 8 |
| 4 | 4.610 | 8 |
| 4 1/2 | 5.800 | 4 |
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New York Corporation Thread (NYC) |
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| 1 1/2 | 2.093 | 11 1/2 |
| 2 | 2.547 | 11 |
| 2 1/2 | 3.000 | 8 |
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Chicago Hose Thread |
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| 3/4 | 1.0810 | 11 1/2 |
| 1 | 1.2951 | 11 1/2 |
| 1 1/4 | 1.7050 | 11 1/2 |
| 2 | 2.5220 | 8 |
| 2 1/2 | 3.0430 | 7 |
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Chicago Fire Dept. Thread |
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| 1 | 1.2951 | 11 1/2 |
| 1 1/2 | 1.9375 | 11 1/2 |
| 2 1/2 | 3.0165 | 7 1/2 |
| 3 1/2 | 4.0700 | 8 |
| 4 | 5.000 | 4 |
| 4 1/2 | 5.7500 | 4 |
| 5 | 6.0570 | 4 |
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*New Chicago Fire Dept Thread |
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| 1 1/2 | 1.933 | 11 1/2 |
| 2 1/2 | 2.990 | 7 1/2 |
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Pacific Coast Thread |
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| 3/4 | 1.065 | 11 |
| 1 | 1.3125 | 11 1/2 |
| 1 1/4 | 1.8600 | 11 |
| 1 1/2 | 2.1000 | 11 |
| 2 | 2.5500 | 10 |
| 2 1/2 | 3.0350 | 7 1/2 |
| Size | Basic O.D. (male part) |
Threads (per inch) |
|
Eastern Hose Thread |
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| 3/4 | 1.0781 | 11 |
| 1 | 1.4219 | 11 |
| 1 1/4 | 1.6875 | 11 1/2 |
| 1 1/2 | 2.1250 | 11 |
| 2 | 2.6719 | 7 1/2 |
| 2 1/2 | 3.0000 | 8 |
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Underwater Tip Thread (UPT) |
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| 1 1/2 | 2.1875 | 12 |
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Garden Hose Thread (GHT) |
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| 3/4 | 1.0625 | 11 1/2 |
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Buffalo, N.Y. |
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| 2 1/2 | 3.0625 | 8 |
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Cleveland, Ohio & Omaha Neb. |
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| 2 1/2 | 3.0781 | 8 |
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Cincinnati Ohio (Old) |
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| 2 1/2 | 3.0937 | 6 |
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Cincinnati Ohio (New) |
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| 2 1/2 | 3.058 | 6 |
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Detroit, Mich. |
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| 2 1/2 | 3.125 | 7 1/2 |
| Denver, Colorado | ||
| 2 1/2 | 3.0938 | 8 |
| Pittsburg, PA | ||
| 2 1/2 | 3.0625 | 6 |
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Toledo, Ohio |
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| 2 1/2 | 3.000 | 8 |
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Canadian Standards Assoc. |
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| 1 1/2 | 1.8788 | 11 1/2 |
| 2 1/2 | 3.1250 | 5 |
| Suction Hose Thread | ||||||||
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4" |
4 1/2" |
5" |
6" |
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| ODM | TPI | ODM | TPI | ODM | TPI | ODM | TPI | |
| American LaFrance | 5.085 | 4 | 5.750 | 4 | 6.150 | 4 | 7.000 | 4 |
| Appliance Corp. | 4.975 | 4 | 6.225 | 4 | 6.975 | 4 | ||
| Buffalo Fire | 4.975 | 4 | 6.225 | 4 | 6.975 | 4 | ||
| Hale Fire Pump | 5.000 | 4 | 5.750 | 4 | 6.250 | 4 | 7.000 | 4 |
| Mack | 4.999 | 4 | 5.7609 | 4 | 6.2059 | 4 | 6.9559 | 4 |
| Maxim | 5.000 | 4 | 5.750 | 4 | 6.250 | 4 | 7.000 | 4 |
| Ward LaFrance | 5.000 | 5.709 | 4 | 6.250 | 4 | 7.250 | 4 | |
| Waterous Fire Pump | 5.0109 | 4 | 5.709 | 4 | 6.260 | 4 | 7.025 | 4 |
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