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How to Identify and Measure Fittings
Pipe size is an industry designation, not the actual size. View information about how to measure threaded and unthreaded pipe and pipe fittings.
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Low-Pressure Iron and Steel Threaded Pipe Fittings
Use these fittings for low-pressure applications in noncorrosive environments.
Adapters for tanks create an inlet or outlet connection on the surface of any tank, pressure vessel, or drum. Adapters with weld end allow for a permanent connection. Adapters with extension fit tightly into the hole, which keeps the fitting steady during welding.
For technical drawings and 3-D models, click on a part number.
- For Use With: Diesel Fuel, Gasoline, Oil, Water
- Specifications Met: ASTM A181, ANSI/ASME B1.20.1
| Pipe Size | For Hole Dia. | OD | Lg. | Material | Each | |
NPT Female × Weld | ||||||
|---|---|---|---|---|---|---|
| 1/8 | 15/16" | 1 5/16" | 3/8" | Steel | 00000000 | 00000 |
| 1/8 | 15/16" | 1 1/2" | 9/16" | Steel | 00000000 | 0000 |
| 1/4 | 15/16" | 1 5/16" | 3/8" | Steel | 00000000 | 0000 |
| 1/4 | 15/16" | 1 1/2" | 9/16" | Steel | 00000000 | 0000 |
| 3/8 | 15/16" | 1 5/16" | 3/8" | Steel | 00000000 | 0000 |
| 3/8 | 15/16" | 1 1/2" | 9/16" | Steel | 00000000 | 0000 |
| 1/2 | 1 1/8" | 1 5/8" | 7/16" | Steel | 00000000 | 0000 |
| 1/2 | 1 1/8" | 1 3/4" | 5/8" | Steel | 00000000 | 0000 |
| 3/4 | 1 5/16" | 1 15/16" | 1/2" | Steel | 00000000 | 0000 |
| 3/4 | 1 3/8" | 2 1/8" | 11/16" | Steel | 00000000 | 0000 |
| 1 | 1 5/8" | 2 3/8" | 3/4" | Steel | 00000000 | 0000 |
| 1 | 1 11/16" | 2 1/4" | 9/16" | Steel | 00000000 | 0000 |
| 1 1/4 | 2" | 2 9/16" | 9/16" | Steel | 00000000 | 0000 |
| 1 1/4 | 2" | 2 11/16" | 3/4" | Steel | 00000000 | 0000 |
| 1 1/2 | 2 1/4" | 2 13/16" | 9/16" | Steel | 00000000 | 0000 |
| 1 1/2 | 2 1/4" | 3" | 3/4" | Steel | 00000000 | 0000 |
| 2 | 2 5/8" | 3 3/8" | 5/8" | Steel | 00000000 | 0000 |
| 2 | 2 5/8" | 3 1/2" | 27/32" | Steel | 00000000 | 00000 |
| 2 1/2 | 3 1/8" | 4 1/16" | 1" | Steel | 00000000 | 00000 |
| 3 | 3 5/8" | 4 5/8" | 1" | Steel | 00000000 | 00000 |
| 4 | 4 11/16" | 5 13/16" | 1 7/32" | Steel | 00000000 | 00000 |
- For Use With: Diesel Fuel, Gasoline, Oil, Water
- Specifications Met: ANSI/ASME SA105, ANSI/ASME SA181-70
| Pipe Size | For Hole Dia. | OD | Lg. | Material | Each | |
NPT Female × Weld | ||||||
|---|---|---|---|---|---|---|
| 1/4 | 3/4" | 1 1/4" | 5/16" | Steel | 00000000 | 00000 |
| 3/8 | 15/16" | 1 1/4" | 3/8" | Steel | 00000000 | 0000 |
| 1/2 | 1 1/8" | 1 1/2" | 1/2" | Steel | 00000000 | 0000 |
| 3/4 | 1 3/8" | 1 3/4" | 5/8" | Steel | 00000000 | 0000 |
| 1 | 1 11/16" | 2 1/8" | 5/8" | Steel | 00000000 | 0000 |
| 1 1/4 | 2" | 2 1/2" | 3/4" | Steel | 00000000 | 0000 |
| 1 1/2 | 2 3/8" | 3" | 3/4" | Steel | 00000000 | 0000 |
| 2 | 2 7/8" | 3 1/2" | 13/16" | Steel | 00000000 | 00000 |
| 2 1/2 | 3 1/2" | 4 1/4" | 1" | Steel | 00000000 | 00000 |
| 3 | 4 1/8" | 4 3/4" | 1" | Steel | 00000000 | 00000 |
| 4 | 5 1/8" | 5 3/4" | 1 3/16" | Steel | 00000000 | 00000 |
Low-Pressure Stainless Steel Threaded Pipe Fittings
Use these fittings in a low-pressure pipe line.
316 stainless steel fittings have excellent corrosion resistance.
Adapters for tanks create an inlet or outlet connection on the surface of any tank, pressure vessel, or drum. Adapters with weld end allow for a permanent connection. Adapters with extension fit tightly into the hole, which keeps the fitting steady during welding.
For technical drawings and 3-D models, click on a part number.
- For Use With: Water, Oil, Gasoline, Diesel Fuel
- Specifications Met: ANSI/ASME B1.20.1, ASTM A182
316 Stainless Steel | |||||
|---|---|---|---|---|---|
| Pipe Size | For Hole Dia. | OD | Lg. | Each | |
NPT Female × Weld | |||||
| 1/4 | 15/16" | 1 1/2" | 5/16" | 0000000 | 000000 |
| 3/8 | 15/16" | 1 1/2" | 5/16" | 0000000 | 00000 |
| 1/2 | 1 1/8" | 1 3/4" | 3/8" | 0000000 | 00000 |
| 3/4 | 1 3/8" | 2 1/8" | 7/16" | 0000000 | 00000 |
| 1 | 1 5/8" | 2 3/8" | 1/2" | 0000000 | 00000 |
| 1 1/4 | 2" | 2 11/16" | 1/2" | 0000000 | 00000 |
| 1 1/2 | 2 1/4" | 3" | 1/2" | 0000000 | 00000 |
| 2 | 2 5/8" | 3 1/2" | 9/16" | 0000000 | 00000 |
| 2 1/2 | 3 1/8" | 4 1/16" | 13/16" | 0000000 | 000000 |
| 3 | 3 5/8" | 4 5/8" | 13/16" | 0000000 | 000000 |
| 4 | 4 7/8" | 5 3/4" | 1 3/16" | 0000000 | 000000 |