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DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense AcquisitionRegulations Supplement) |
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REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration,Evaluation, Authorization and Restriction of Chemicals) |
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RoHS (Restriction of Hazardous Substances) RoHS (Restriction ofHazardous Substances) |
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Fabrication Fabrication |
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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.
More
Low-Pressure Iron and Steel Threaded Pipe Fittings
Use these fittings for low-pressure applications in noncorrosive environments.
For technical drawings and 3-D models, click on a part number.
Plugs with Square Drive

- For Use With: Air, Steam, Oil, Water, Natural Gas
- Presure Class:
Steel: 150
Iron: 125 - Pipe Nipples and Pipe: Use Schedule 40 steel
Pipe Size | Plug Construction | Max. Pressure | Max. Steam Pressure | Material | Each | |
NPT Male | ||||||
---|---|---|---|---|---|---|
2 1/2 | Hollow | 175 psi @ 72° F | 125 psi @ 350° F | Black-Coated Iron | 000000000 | 000000 |
3 | Hollow | 175 psi @ 72° F | 125 psi @ 350° F | Black-Coated Iron | 000000000 | 00000 |
3 1/2 | Hollow | 175 psi @ 72° F | 125 psi @ 350° F | Black-Coated Iron | 000000000 | 00000 |
4 | Hollow | 175 psi @ 72° F | 125 psi @ 350° F | Black-Coated Iron | 000000000 | 000000 |
Low-Pressure Cast Iron Threaded Pipe Fittings
Made of cast iron, these fittings are brittle and can be quickly opened with the strike of a sledge hammer in case of an emergency. They are also known as Pressure Class 125 fittings. Use in noncorrosive environments.
For technical drawings and 3-D models, click on a part number.
Plugs with Square Drive

- For Use With: Air, Steam, Oil, Water, Natural Gas
- Pressure Class: 125
- Specifications Met: ASME B16.14, ASME B16.4, ASTM A126, ASME B1.20.1
- Pipe Nipples and Pipe: Use Schedule 40 steel
Pipe Size | Plug Construction | Max. Pressure | Max. Steam Pressure | Material | Each | |
NPT Male | ||||||
---|---|---|---|---|---|---|
1 | Solid | 125 psi @ 72° F | 125 psi @ 350° F | Iron | 000000000 | 00000 |
1 1/4 | Solid | 125 psi @ 72° F | 125 psi @ 350° F | Iron | 000000000 | 0000 |
1 1/2 | Solid | 125 psi @ 72° F | 125 psi @ 350° F | Iron | 000000000 | 0000 |
2 | Solid | 125 psi @ 72° F | 125 psi @ 350° F | Iron | 000000000 | 00000 |
2 1/2 | Solid | 125 psi @ 72° F | 125 psi @ 350° F | Iron | 000000000 | 00000 |
3 | Solid | 125 psi @ 72° F | 125 psi @ 350° F | Iron | 000000000 | 00000 |
4 | Solid | 125 psi @ 72° F | 125 psi @ 350° F | Iron | 000000000 | 00000 |