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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.
NPTF (Dryseal) threads, NPSC (National Pipe Straight Coupling) threads, and NPSL (National Pipe Straight Locknut) threads are compatible with NPT threads.
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 |
- For Use With: Diesel Fuel, Gasoline, Oil, Water
- Pipe Nipples and Pipe: Use Schedule 40 steel
Compact Extreme-Pressure Steel Threaded Pipe Fittings
These fittings are strong enough to handle extreme pressures, yet small enough to fit into cramped spaces. They are galvanized steel, which has fair corrosion resistance.
Through-wall fittings are also known as bulkhead couplings; they mount through your wall to create an inlet or outlet. When installing, the gasket should be on the inside of the wall. BSPP and metric male threads have a gasket and washer to prevent leaks.
For technical drawings and 3-D models, click on a part number.
Threads with
Gasket and Washer
- For Use With: Air, Hydraulic Fluid, Oil, Water
- Specifications Met: ISO 1179, ISO 8434-6
