While building a monitoring system for my heating oil tank, I discovered the madness of pipe dimensions. I had in my hands a fitting of some sort with the following written on it: 2x1 1/2. I measured about every possible angles on this fitting without anything coming close to 2 or 1.5 inches. Here is a table to help me/you find the right piece to the puzzle. Sources:
| Nominal NPT Size |
O.D. | I.D. | Thickness | TPI | Pitch |
|---|---|---|---|---|---|
| 1/16" | 0.3125" (7.94 mm) | 27 | 0.03704" (0.94082 mm) | ||
| 1/8" | 0.405" | 27 | 0.03704" (0.94082 mm) | ||
| 1/4" | 0.540" | 0.364" | 0.088" | 18 | 0.05556" (1.41122 mm) |
| 3/8" | 0.675" | 0.493" | 0.091" | 18 | 0.05556" (1.41122 mm) |
| 1/2" | 0.840" | 0.622" | 0.109" | 14 | 0.07143" (1.81432 mm) |
| 3/4" | 1.050" | 0.824" | 0.113" | 14 | 0.07143" (1.81432 mm) |
| 1" | 1.315" | 1.049" | 0.133" | 11.5 | 0.08696" (2.20878 mm) |
| 1-1/4" | 1.660" | 1.380" | 0.140" | 11.5 | 0.08696" (2.20878 mm) |
| 1-1/2" | 1.900" | 1.610" | 0.145" | 11.5 | 0.08696" (2.20878 mm) |
| 2" | 2.375" | 2.067" | 0.154" | 11.5 | 0.08696" (2.20878 mm) |
| 2-1/2" | 2.875" | 2.468" | 0.204" | 8 | 0.12500" (3.175 mm) |
| 3" | 3.500" (88.90 mm) | 8 | 0.12500" (3.175 mm) |
Last updated: 2010-10-08 20:05:23