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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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Standard-Wall Steel Threaded Pipe Nipples and Pipe
Also known as Schedule 40, this pipe is designed for low-pressure applications. Use in noncorrosive applications.
Welded pipe has a weld bead on the inside.
NPT Threaded on Both Ends—1/8 to 1 Pipe Size
- For Use With: Air, Natural Gas, Oil, Steam, Water
- Specifications Met: ASTM A733, ASME B1.20.1, ASTM A53
- Fittings: Use Class 125 or 150 Iron and Steel
NPT Threaded on Both Ends—1 1/4 to 6 Pipe Size
- For Use With: Air, Natural Gas, Oil, Steam, Water
- Specifications Met: ASTM A733, ASME B1.20.1, ASTM A53
- Fittings: Use Class 125 or 150 Iron and Steel
Standard-Wall Galvanized Steel Threaded Pipe Nipples and Pipe
Made of galvanized steel, this Schedule 40 pipe has fair corrosion resistance and is designed for low-pressure applications.
Welded pipe has a weld bead on the inside.
NPT Threaded on Both Ends—1/8 to 1 Pipe Size
- For Use With: Air, Natural Gas, Oil, Steam, Water
- Specifications Met: ASTM A733, ASME B1.20.1, ASTM A53
- Fittings: Use Class 125 or 150 galvanized iron and galvanized steel
- Flanges: Use Class 150 galvanized steel
NPT Threaded on Both Ends—1 1/4 to 6 Pipe Size
- For Use With: Air, Natural Gas, Oil, Steam, Water
- Specifications Met: ASTM A733, ASME B1.20.1, ASTM A53
- Fittings: Use Class 125 or 150 galvanized iron and galvanized steel
- Flanges: Use Class 150 galvanized steel
Thick-Wall Steel Threaded Pipe Nipples and Pipe
Also known as Schedule 80, this pipe has thick walls for good strength in medium-pressure applications.
Welded pipe has a weld bead on the inside.
NPT Threaded on Both Ends
- For Use With: Air, Natural Gas, Oil, Steam, Water
- Specifications Met: See table
- Fittings: Use Class 300 iron or steel
- Flanges: Use Class 300 or 600 steel
| Lg. | Material | Specifications Met | Each | |
Welded | ||||
|---|---|---|---|---|
1/8 Pipe Size | ||||
| 126" | Steel | ASME B1.20.1, ASTM A53, ASTM A733 | 0000000 | 0000000 |
1/4 Pipe Size | ||||
| 126" | Steel | ASME B1.20.1, ASTM A53, ASTM A733 | 0000000 | 000000 |
3/8 Pipe Size | ||||
| 126" | Steel | ASME B1.20.1, ASTM A53, ASTM A733 | 0000000 | 000000 |
1/2 Pipe Size | ||||
| 126" | Steel | ASME B1.20.1, ASTM A53, ASTM A733 | 0000000 | 000000 |
3/4 Pipe Size | ||||
| 126" | Steel | ASME B1.20.1, ASTM A53, ASTM A733 | 0000000 | 000000 |
1 Pipe Size  | ||||
| 126" | Steel | ASME B1.20.1, ASTM A53, ASTM A733 | 0000000 | 000000 |
1 1/4 Pipe Size | ||||
| 126" | Steel | ASME B1.20.1, ASTM A53, ASTM A733 | 0000000 | 000000 |
1 1/2 Pipe Size | ||||
| 126" | Steel | ASME B1.20.1, ASTM A53, ASTM A733 | 0000000 | 000000 |
2 Pipe Size | ||||
| 126" | Steel | ASME B1.20.1, ASTM A53, ASTM A733 | 0000000 | 000000 |