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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FM-Approved Low-Pressure Cast Iron Threaded Pipe Fittings
Suitable for use in fire-protection applications, these pipe fittings are made of cast iron, so they are brittle and can be quickly opened with the strike of a sledge hammer. 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.
- For Use With: Air, Steam, Oil, Water, Natural Gas
- Pressure Class: 125
- Specifications Met: FM Approved, UL Listed, ASTM A126, ASME B1.20.1, ASME B16.4
- Pipe Nipples and Pipe: Use Schedule 40 steel
Pipe Size | Plug Construction | Max. Pressure | Max. Steam Pressure | Material | Each | |
NPT Male | ||||||
|---|---|---|---|---|---|---|
| 1 | Solid | 175 psi @ 72° F | 125 psi @ 350° F | Iron | 000000000 | 000000 |
| 1 1/4 | Solid | 175 psi @ 72° F | 125 psi @ 350° F | Iron | 000000000 | 00000 |
| 1 1/2 | Solid | 175 psi @ 72° F | 125 psi @ 350° F | Iron | 000000000 | 00000 |
| 2 | Solid | 175 psi @ 72° F | 125 psi @ 350° F | Iron | 000000000 | 00000 |
| 2 1/2 | Solid | 175 psi @ 72° F | 125 psi @ 350° F | Iron | 000000000 | 00000 |
| 3 | Solid | 175 psi @ 72° F | 125 psi @ 350° F | Iron | 000000000 | 00000 |
| 4 | Solid | 175 psi @ 72° F | 125 psi @ 350° F | Iron | 000000000 | 000000 |
- For Use With: Air, Steam, Oil, Water, Natural Gas
- Pressure Class: 125
- Specifications Met: FM Approved, UL Listed, ASTM A126, ASME B1.20.1, ASME B16.4
- Pipe Nipples and Pipe: Use Schedule 40 steel
| Pipe Size | Plug Construction | Max. Pressure | Max. Steam Pressure | Material | Each | |
NPT Male | ||||||
|---|---|---|---|---|---|---|
| 1 | Solid | 175 psi @ 72° F | 125 psi @ 350° F | Iron | 000000000 | 00000 |
| 1 1/4 | Solid | 175 psi @ 72° F | 125 psi @ 350° F | Iron | 000000000 | 0000 |
| 1 1/2 | Solid | 175 psi @ 72° F | 125 psi @ 350° F | Iron | 000000000 | 0000 |
| 2 | Solid | 175 psi @ 72° F | 125 psi @ 350° F | Iron | 000000000 | 0000 |
| 2 1/2 | Solid | 175 psi @ 72° F | 125 psi @ 350° F | Iron | 000000000 | 00000 |
| 3 | Solid | 175 psi @ 72° F | 125 psi @ 350° F | Iron | 000000000 | 00000 |
| 4 | Solid | 175 psi @ 72° F | 125 psi @ 350° F | Iron | 000000000 | 00000 |
FM-Approved Low-Pressure Cast Iron Unthreaded Pipe Flanges
- For Use With: Air, Diesel Fuel, Gasoline, Natural Gas, Oil, Steam, Water
- Pressure Class: 125
- Specifications Met: ASME B1.20.1, ASME B16.1, ASTM A126, FM Approved
- Pipe Nipples and Pipe: Use Schedule 40 steel
- Fittings: Use Class 125 or 150 iron and steel
FM-approved for fire protection applications, these flanges are cast iron, so they're brittle and can be quickly opened by hitting them with a sledge hammer. Bolt them together with a gasket (not included) to create an access point within a low-pressure pipe line. All are cap flanges, which are also known as blind flanges. Use them in noncorrosive environments.
For technical drawings and 3-D models, click on a part number.
Bolt Hole | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Pipe Size | Flange OD | For Bolt Dia. | Dia. | No. of | Bolt Circle Dia. | Max. Pressure | Max. Steam Pressure | Each | |
| 1 | 4 1/4" | 1/2" | 5/8" | 4 | 3 1/8" | 200 psi @ 72° F | 165 psi @ 300° F | 0000000 | 000000 |
| 1 1/2 | 5" | 1/2" | 5/8" | 4 | 3 7/8" | 200 psi @ 72° F | 165 psi @ 300° F | 0000000 | 00000 |
| 2 | 6" | 5/8" | 3/4" | 4 | 4 3/4" | 200 psi @ 72° F | 165 psi @ 300° F | 0000000 | 00000 |
| 2 1/2 | 7" | 5/8" | 3/4" | 4 | 5 1/2" | 200 psi @ 72° F | 165 psi @ 300° F | 0000000 | 00000 |
| 3 | 7 1/2" | 5/8" | 3/4" | 4 | 6" | 200 psi @ 72° F | 165 psi @ 300° F | 0000000 | 00000 |
| 3 1/2 | 8 1/2" | 5/8" | 3/4" | 8 | 7" | 200 psi @ 72° F | 165 psi @ 300° F | 0000000 | 000000 |
| 4 | 9" | 5/8" | 3/4" | 8 | 7 1/2" | 200 psi @ 72° F | 165 psi @ 300° F | 0000000 | 000000 |
| 6 | 11" | 3/4" | 7/8" | 8 | 9 1/2" | 200 psi @ 72° F | 165 psi @ 300° F | 0000000 | 000000 |
Grooved-End Iron Pipe Fittings
The grooved ends on these fittings connect to pipe with a clamp to easily install piping systems. Since there’s no heat or threading required, they provide quick access to a pipe line for routine maintenance. Fittings are also known as Victaulic fittings. They are for use in noncorrosive applications.
For technical drawings and 3-D models, click on a part number.
- For Use With: Air, Water
- Temperature Range: -30° to 250° F
- Specifications Met: UL Listed, FM Approved, ASTM A536
| Pipe Size | Max. Pressure | Color | Material | Each | |
| 2 | 750 psi @ 72° F | Orange | Enamel-Coated Ductile Iron | 0000000 | 000000 |
| 2 1/2 | 750 psi @ 72° F | Orange | Enamel-Coated Ductile Iron | 00000000 | 00000 |
| 3 | 750 psi @ 72° F | Orange | Enamel-Coated Ductile Iron | 0000000 | 00000 |
| 4 | 750 psi @ 72° F | Orange | Enamel-Coated Ductile Iron | 0000000 | 00000 |
| 6 | 750 psi @ 72° F | Orange | Enamel-Coated Ductile Iron | 00000000 | 000000 |