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Resources: The Greatest Invention - Class 150 vs 3000 Fittings - NPT Size Chart - Aluminum Info - Stainless Steel Info
| Aluminum | 1/8" NPT | 1/4" NPT | 3/8" NPT | 1/2" NPT | 3/4" NPT | 1" NPT |
| 1-1/4" NPT | 1-1/2" NPT | 2" NPT | 2-1/2" NPT | 3" NPT | 4" NPT | 6" NPT |
| Stainless | 1/8" NPT | 1/4" NPT | 3/8" NPT | 1/2" NPT | 3/4" NPT | 1" NPT |
| 1-1/4" NPT | 1-1/2" NPT | 2" NPT | 2-1/2" NPT | 3" NPT | 4" NPT |
| Steel | 1/8" NPT | 1/4" NPT | 3/8" NPT | 1/2" NPT | 3/4" NPT | 1" NPT |
| 1-1/4" NPT | 1-1/2" NPT | 2" NPT | 2-1/2" NPT | 3" NPT | 4" NPT |

Half Coupling weld bungs are often used to weld onto a tank to connect a pipe fitting.
Full Couplings are frequently used to connect two pieces of pipe together.
Flange Weld Bungs are also referred to as Top Hat Bungs or Weld Spuds.
Merchant Couplings and Half Couplings are Low-Pressure Black Steel Straight Pipe Thread Fittings.