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Resources: The Greatest Invention - Class 150 vs 3000 Fittings - NPT Size Chart - Aluminum Info - Stainless Steel Info
| Pipe Thread Size | Thread Diameter | Outside Diameter | Total Length |
| 1/8" NPT | 0.405" | 0.62" | 0.75" |
| 1/4" NPT | 0.540" | 0.75 | 1.0" |
| 3/8" NPT | 0.675" | 0.88 | 1.0" |
| 1/2" NPT | 0.840" | 1.12" | 1.25" |
| 3/4" NPT | 1.050" | 1.38" | 1.44" |
| 1" NPT | 1.315" | 1.75" | 1.62" |
| 1-1/4" NPT | 1.66" | 2.25" | 1.75" |
| 1-1/2" NPT | 1.90" | 2.50" | 1.75" |
| 2" NPT | 2.375" | 3.0" | 1.88" |
| 2-1/2" NPT | 2.875" | 3.62" | 2.38" |
| 3" NPT | 3.5" | 4.25" | 2.56" |