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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 Stainless Steel
Threaded Pipe Nipples and Pipe
Designed for low-pressure flow applications, this pipe is also known as Schedule 40.
304 stainless steel pipe offers very good corrosion resistance. 316 stainless steel pipe has excellent corrosion resistance.
Seamless pipe has a smooth interior for unrestricted flow and is stronger than welded pipe. Welded pipe has a weld bead on the inside.
For technical drawings and 3-D models, click on a part number.
NPT Threaded on One End—304/304L Stainless Steel
- For Use With: Natural Gas, Oil, Steam, Water, Air
- Specifications Met: ASTM A733, ANSI/ASME B1.20.1, ASTM A312
- Fittings: Use Class 150 or Schedule 40 stainless steel
- Flanges: Use Class 150 stainless steel
| Lg. | Construction | Each | |
1/8 Pipe Size | |||
|---|---|---|---|
| 1" | Seamless | 0000000 | 00000 |
| 1 1/2" | Seamless | 0000000 | 0000 |
| 2" | Seamless | 0000000 | 0000 |
| 2 1/2" | Seamless | 0000000 | 0000 |
| 3" | Seamless | 0000000 | 0000 |
| 3 1/2" | Seamless | 000000 | 0000 |
| 4" | Seamless | 0000000 | 0000 |
| 4 1/2" | Seamless | 00000000 | 0000 |
| 5" | Seamless | 00000000 | 0000 |
| 5 1/2" | Seamless | 00000000 | 0000 |
| 6" | Seamless | 0000000 | 0000 |
| 8" | Seamless | 00000000 | 0000 |
| 10" | Seamless | 00000000 | 0000 |
| 12" | Seamless | 00000000 | 0000 |
1/4 Pipe Size | |||
| 1" | Seamless | 0000000 | 0000 |
| 1 1/2" | Seamless | 0000000 | 0000 |
| 2" | Seamless | 0000000 | 0000 |
| 2 1/2" | Seamless | 0000000 | 0000 |
| 3" | Seamless | 0000000 | 0000 |
| 3 1/2" | Seamless | 0000000 | 0000 |
| 4" | Seamless | 0000000 | 0000 |
| 4 1/2" | Seamless | 00000000 | 0000 |
| 5" | Seamless | 00000000 | 0000 |
| 5 1/2" | Seamless | 00000000 | 0000 |
| 6" | Seamless | 0000000 | 0000 |
| 8" | Seamless | 00000000 | 0000 |
| 10" | Seamless | 00000000 | 0000 |
| 12" | Seamless | 00000000 | 0000 |
3/8 Pipe Size | |||
| 1" | Seamless | 0000000 | 0000 |
| 1 1/2" | Seamless | 0000000 | 0000 |
| 2" | Seamless | 0000000 | 0000 |
| 2 1/2" | Seamless | 0000000 | 0000 |
| 3" | Seamless | 0000000 | 0000 |
| 3 1/2" | Seamless | 0000000 | 0000 |
| 4" | Seamless | 0000000 | 0000 |
| 4 1/2" | Seamless | 00000000 | 0000 |
| 5" | Seamless | 00000000 | 0000 |
| 5 1/2" | Seamless | 00000000 | 0000 |
| 6" | Seamless | 0000000 | 0000 |
| 8" | Seamless | 00000000 | 0000 |
| 10" | Seamless | 00000000 | 0000 |
| 12" | Seamless | 00000000 | 00000 |
1/2 Pipe Size | |||
| 1" | Welded | 0000000 | 0000 |
| 1 1/2" | Welded | 0000000 | 0000 |
| 2" | Welded | 0000000 | 0000 |
| 2 1/2" | Welded | 0000000 | 0000 |
| 3" | Welded | 0000000 | 0000 |
| 3 1/2" | Welded | 0000000 | 0000 |
| 4" | Welded | 0000000 | 0000 |
| 4 1/2" | Welded | 00000000 | 0000 |
| 5" | Welded | 00000000 | 0000 |
| 5 1/2" | Welded | 00000000 | 0000 |
| 6" | Welded | 0000000 | 0000 |
| 8" | Welded | 00000000 | 0000 |
| 10" | Welded | 00000000 | 00000 |
| 12" | Welded | 00000000 | 00000 |
3/4 Pipe Size | |||
| 1" | Welded | 0000000 | 0000 |
| 1 1/2" | Welded | 0000000 | 0000 |
| 2" | Welded | 0000000 | 0000 |
| 2 1/2" | Welded | 0000000 | 0000 |
| 3" | Welded | 0000000 | 0000 |
| 3 1/2" | Welded | 0000000 | 0000 |
| 4" | Welded | 0000000 | 0000 |
| 4 1/2" | Welded | 00000000 | 0000 |
| 5" | Welded | 00000000 | 0000 |
| 5 1/2" | Welded | 00000000 | 0000 |
| 6" | Welded | 0000000 | 0000 |
| 8" | Welded | 00000000 | 00000 |
| 10" | Welded | 00000000 | 00000 |
| 12" | Welded | 00000000 | 00000 |
1 Pipe Size | |||
| 1 1/2" | Welded | 0000000 | 0000 |
| 2" | Welded | 0000000 | 0000 |
| 2 1/2" | Welded | 0000000 | 0000 |
| 3" | Welded | 0000000 | 0000 |
| 3 1/2" | Welded | 0000000 | 0000 |
| 4" | Welded | 0000000 | 0000 |
| 4 1/2" | Welded | 00000000 | 0000 |
| 5" | Welded | 00000000 | 0000 |
| 5 1/2" | Welded | 00000000 | 0000 |
| 6" | Welded | 0000000 | 00000 |
| 8" | Welded | 00000000 | 00000 |
| 10" | Welded | 00000000 | 00000 |
| 12" | Welded | 00000000 | 00000 |
1 1/4 Pipe Size | |||
| 1 1/2" | Welded | 0000000 | 0000 |
| 2" | Welded | 0000000 | 0000 |
| 2 1/2" | Welded | 0000000 | 0000 |
| 3" | Welded | 0000000 | 0000 |
| 3 1/2" | Welded | 0000000 | 0000 |
| 4" | Welded | 0000000 | 0000 |
| 4 1/2" | Welded | 00000000 | 00000 |
| 5" | Welded | 00000000 | 00000 |
| 5 1/2" | Welded | 00000000 | 00000 |
| 6" | Welded | 0000000 | 00000 |
| 8" | Welded | 00000000 | 00000 |
| 10" | Welded | 00000000 | 00000 |
| 12" | Welded | 00000000 | 00000 |
1 1/2 Pipe Size | |||
| 1 1/2" | Welded | 0000000 | 0000 |
| 2" | Welded | 0000000 | 0000 |
| 2 1/2" | Welded | 0000000 | 0000 |
| 3" | Welded | 0000000 | 0000 |
| 3 1/2" | Welded | 0000000 | 0000 |
| 4" | Welded | 0000000 | 00000 |
| 4 1/2" | Welded | 00000000 | 00000 |
| 5" | Welded | 00000000 | 00000 |
| 5 1/2" | Welded | 00000000 | 00000 |
| 6" | Welded | 0000000 | 00000 |
| 8" | Welded | 00000000 | 00000 |
| 10" | Welded | 00000000 | 00000 |
| 12" | Welded | 00000000 | 00000 |
2 Pipe Size | |||
| 2" | Welded | 0000000 | 0000 |
| 2 1/2" | Welded | 0000000 | 0000 |
| 3" | Welded | 0000000 | 00000 |
| 3 1/2" | Welded | 0000000 | 00000 |
| 4" | Welded | 0000000 | 00000 |
| 4 1/2" | Welded | 00000000 | 00000 |
| 5" | Welded | 00000000 | 00000 |
| 5 1/2" | Welded | 00000000 | 00000 |
| 6" | Welded | 0000000 | 00000 |
| 8" | Welded | 00000000 | 00000 |
| 10" | Welded | 00000000 | 00000 |
| 12" | Welded | 00000000 | 00000 |
2 1/2 Pipe Size | |||
| 2 1/2" | Welded | 00000000 | 00000 |
| 3" | Welded | 00000000 | 00000 |
| 3 1/2" | Welded | 0000000 | 00000 |
| 4" | Welded | 00000000 | 00000 |
| 4 1/2" | Welded | 00000000 | 00000 |
| 5" | Welded | 00000000 | 00000 |
| 5 1/2" | Welded | 00000000 | 00000 |
| 6" | Welded | 00000000 | 00000 |
| 8" | Welded | 00000000 | 00000 |
| 10" | Welded | 00000000 | 00000 |
| 12" | Welded | 00000000 | 00000 |
3 Pipe Size | |||
| 2 1/2" | Welded | 00000000 | 00000 |
| 3" | Welded | 00000000 | 00000 |
| 3 1/2" | Welded | 000000 | 00000 |
| 4" | Welded | 00000000 | 00000 |
| 4 1/2" | Welded | 00000000 | 00000 |
| 5" | Welded | 00000000 | 00000 |
| 5 1/2" | Welded | 00000000 | 00000 |
| 6" | Welded | 00000000 | 00000 |
| 8" | Welded | 00000000 | 00000 |
| 10" | Welded | 00000000 | 00000 |
| 12" | Welded | 00000000 | 00000 |
4 Pipe Size | |||
| 2 1/2" | Welded | 00000000 | 00000 |
| 3" | Welded | 00000000 | 00000 |
| 3 1/2" | Welded | 0000000 | 00000 |
| 4" | Welded | 00000000 | 00000 |
| 4 1/2" | Welded | 00000000 | 00000 |
| 5" | Welded | 00000000 | 00000 |
| 5 1/2" | Welded | 00000000 | 00000 |
| 6" | Welded | 00000000 | 00000 |
| 8" | Welded | 00000000 | 00000 |
| 10" | Welded | 00000000 | 00000 |
| 12" | Welded | 00000000 | 000000 |
6 Pipe Size | |||
| 3 1/2" | Welded | 0000000 | 000000 |
| 4" | Welded | 00000000 | 000000 |
| 4 1/2" | Welded | 00000000 | 000000 |
| 5" | Welded | 00000000 | 000000 |
| 5 1/2" | Welded | 00000000 | 000000 |
| 6" | Welded | 00000000 | 000000 |
| 8" | Welded | 00000000 | 000000 |
| 10" | Welded | 00000000 | 000000 |
| 12" | Welded | 00000000 | 000000 |
NPT Threaded on One End—316/316L Stainless Steel
- For Use With: Natural Gas, Oil, Steam, Water, Air
- Specifications Met: ASTM A733, ANSI/ASME B1.20.1, ASTM A312
- Fittings: Use Class 150 or Schedule 40 stainless steel
- Flanges: Use Class 150 stainless steel
| Lg. | Construction | Each | |
1/8 Pipe Size | |||
|---|---|---|---|
| 3 1/2" | Seamless | 0000000 | 00000 |
| 4 1/2" | Seamless | 0000000 | 0000 |
| 5" | Seamless | 0000000 | 0000 |
| 5 1/2" | Seamless | 0000000 | 0000 |
| 8" | Seamless | 0000000 | 0000 |
| 10" | Seamless | 0000000 | 0000 |
| 12" | Seamless | 0000000 | 0000 |
1/4 Pipe Size | |||
| 1" | Seamless | 0000000 | 0000 |
| 1 1/2" | Seamless | 0000000 | 0000 |
| 2" | Seamless | 0000000 | 0000 |
| 2 1/2" | Seamless | 0000000 | 0000 |
| 3" | Seamless | 0000000 | 0000 |
| 3 1/2" | Seamless | 0000000 | 0000 |
| 4" | Seamless | 0000000 | 0000 |
| 4 1/2" | Seamless | 0000000 | 0000 |
| 5" | Seamless | 0000000 | 0000 |
| 5 1/2" | Seamless | 0000000 | 0000 |
| 6" | Seamless | 0000000 | 0000 |
| 8" | Seamless | 00000000 | 0000 |
| 10" | Seamless | 00000000 | 0000 |
| 12" | Seamless | 00000000 | 00000 |
3/8 Pipe Size | |||
| 1" | Seamless | 0000000 | 0000 |
| 1 1/2" | Seamless | 0000000 | 0000 |
| 2" | Seamless | 0000000 | 0000 |
| 2 1/2" | Seamless | 0000000 | 0000 |
| 3" | Seamless | 0000000 | 0000 |
| 3 1/2" | Seamless | 00000000 | 0000 |
| 4" | Seamless | 0000000 | 0000 |
| 4 1/2" | Seamless | 00000000 | 0000 |
| 5" | Seamless | 00000000 | 0000 |
| 5 1/2" | Seamless | 00000000 | 0000 |
| 6" | Seamless | 0000000 | 0000 |
| 8" | Seamless | 00000000 | 0000 |
| 10" | Seamless | 00000000 | 00000 |
| 12" | Seamless | 00000000 | 00000 |
1/2 Pipe Size | |||
| 1" | Welded | 0000000 | 0000 |
| 1 1/2" | Welded | 0000000 | 0000 |
| 2" | Welded | 0000000 | 0000 |
| 2 1/2" | Welded | 0000000 | 0000 |
| 3" | Welded | 0000000 | 0000 |
| 3 1/2" | Welded | 00000000 | 0000 |
| 4" | Welded | 0000000 | 0000 |
| 4 1/2" | Welded | 00000000 | 0000 |
| 5" | Welded | 00000000 | 0000 |
| 5 1/2" | Welded | 00000000 | 0000 |
| 6" | Welded | 0000000 | 0000 |
| 8" | Welded | 00000000 | 00000 |
| 10" | Welded | 00000000 | 00000 |
| 12" | Welded | 00000000 | 00000 |
3/4 Pipe Size | |||
| 1" | Welded | 0000000 | 0000 |
| 1 1/2" | Welded | 0000000 | 0000 |
| 2" | Welded | 0000000 | 0000 |
| 2 1/2" | Welded | 0000000 | 0000 |
| 3" | Welded | 0000000 | 0000 |
| 3 1/2" | Welded | 00000000 | 0000 |
| 4" | Welded | 0000000 | 0000 |
| 4 1/2" | Welded | 00000000 | 0000 |
| 5" | Welded | 00000000 | 0000 |
| 5 1/2" | Welded | 00000000 | 0000 |
| 6" | Welded | 0000000 | 00000 |
| 8" | Welded | 00000000 | 00000 |
| 10" | Welded | 00000000 | 00000 |
| 12" | Welded | 00000000 | 00000 |
1 Pipe Size | |||
| 1 1/2" | Welded | 0000000 | 0000 |
| 2" | Welded | 0000000 | 0000 |
| 2 1/2" | Welded | 0000000 | 0000 |
| 3" | Welded | 0000000 | 0000 |
| 3 1/2" | Welded | 00000000 | 0000 |
| 4" | Welded | 0000000 | 0000 |
| 4 1/2" | Welded | 00000000 | 00000 |
| 5" | Welded | 00000000 | 00000 |
| 5 1/2" | Welded | 00000000 | 00000 |
| 6" | Welded | 0000000 | 00000 |
| 8" | Welded | 00000000 | 00000 |
| 10" | Welded | 00000000 | 00000 |
| 12" | Welded | 00000000 | 00000 |
1 1/4 Pipe Size | |||
| 1 1/2" | Welded | 0000000 | 0000 |
| 2" | Welded | 0000000 | 0000 |
| 2 1/2" | Welded | 0000000 | 0000 |
| 3" | Welded | 0000000 | 0000 |
| 3 1/2" | Welded | 00000000 | 00000 |
| 4" | Welded | 0000000 | 00000 |
| 4 1/2" | Welded | 00000000 | 00000 |
| 5" | Welded | 00000000 | 00000 |
| 5 1/2" | Welded | 00000000 | 00000 |
| 6" | Welded | 0000000 | 00000 |
| 8" | Welded | 00000000 | 00000 |
| 10" | Welded | 00000000 | 00000 |
| 12" | Welded | 00000000 | 00000 |
1 1/2 Pipe Size | |||
| 1 1/2" | Welded | 0000000 | 0000 |
| 2" | Welded | 0000000 | 0000 |
| 2 1/2" | Welded | 0000000 | 0000 |
| 3" | Welded | 0000000 | 00000 |
| 3 1/2" | Welded | 00000000 | 00000 |
| 4" | Welded | 0000000 | 00000 |
| 4 1/2" | Welded | 00000000 | 00000 |
| 5" | Welded | 00000000 | 00000 |
| 5 1/2" | Welded | 00000000 | 00000 |
| 6" | Welded | 0000000 | 00000 |
| 8" | Welded | 00000000 | 00000 |
| 10" | Welded | 00000000 | 00000 |
| 12" | Welded | 00000000 | 00000 |
2 Pipe Size | |||
| 2" | Welded | 0000000 | 00000 |
| 2 1/2" | Welded | 0000000 | 00000 |
| 3" | Welded | 0000000 | 00000 |
| 3 1/2" | Welded | 00000000 | 00000 |
| 4" | Welded | 0000000 | 00000 |
| 4 1/2" | Welded | 00000000 | 00000 |
| 5" | Welded | 00000000 | 00000 |
| 5 1/2" | Welded | 00000000 | 00000 |
| 6" | Welded | 0000000 | 00000 |
| 8" | Welded | 00000000 | 00000 |
| 10" | Welded | 00000000 | 00000 |
| 12" | Welded | 00000000 | 00000 |
2 1/2 Pipe Size | |||
| 3 1/2" | Welded | 00000000 | 00000 |
| 4 1/2" | Welded | 00000000 | 00000 |
| 5" | Welded | 00000000 | 00000 |
| 5 1/2" | Welded | 00000000 | 00000 |
| 8" | Welded | 00000000 | 00000 |
| 10" | Welded | 00000000 | 00000 |
| 12" | Welded | 00000000 | 00000 |
3 Pipe Size | |||
| 2 1/2" | Welded | 0000000 | 00000 |
| 3" | Welded | 0000000 | 00000 |
| 3 1/2" | Welded | 00000000 | 00000 |
| 4" | Welded | 0000000 | 00000 |
| 4 1/2" | Welded | 00000000 | 00000 |
| 5" | Welded | 00000000 | 00000 |
| 5 1/2" | Welded | 00000000 | 00000 |
| 6" | Welded | 0000000 | 00000 |
| 8" | Welded | 00000000 | 00000 |
| 10" | Welded | 00000000 | 00000 |
| 12" | Welded | 00000000 | 000000 |
4 Pipe Size | |||
| 2 1/2" | Welded | 0000000 | 00000 |
| 3" | Welded | 0000000 | 00000 |
| 3 1/2" | Welded | 00000000 | 00000 |
| 4" | Welded | 0000000 | 00000 |
| 4 1/2" | Welded | 00000000 | 00000 |
| 5" | Welded | 00000000 | 00000 |
| 5 1/2" | Welded | 00000000 | 00000 |
| 6" | Welded | 0000000 | 00000 |
| 8" | Welded | 00000000 | 000000 |
| 10" | Welded | 00000000 | 000000 |
| 12" | Welded | 00000000 | 000000 |
6 Pipe Size | |||
| 3 1/2" | Welded | 00000000 | 000000 |
| 4" | Welded | 00000000 | 000000 |
| 4 1/2" | Welded | 00000000 | 000000 |
| 5" | Welded | 00000000 | 000000 |
| 5 1/2" | Welded | 00000000 | 000000 |
| 6" | Welded | 00000000 | 000000 |
| 8" | Welded | 00000000 | 000000 |
| 10" | Welded | 00000000 | 000000 |
| 12" | Welded | 00000000 | 000000 |