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 Use With: Natural Gas, Oil, Steam, Water, Air
- Specifications Met: ASTM A733, ASME B1.20.1
- Fittings: Use Class 150 stainless steel
- Flanges: Use Class 150 stainless steel
| Lg. | Construction | Each | |
1/4 Pipe Size  | |||
|---|---|---|---|
| 54" | Seamless | 00000000 | 000000 |
3/8 Pipe Size | |||
| 54" | Seamless | 00000000 | 00000 |
1/2 Pipe Size | |||
| 54" | Welded | 00000000 | 00000 |
3/4 Pipe Size | |||
| 54" | Welded | 00000000 | 000000 |
1 Pipe Size | |||
| 54" | Welded | 00000000 | 000000 |
1 1/4 Pipe Size | |||
| 54" | Welded | 0000000 | 000000 |
1 1/2 Pipe Size | |||
| 54" | Welded | 00000000 | 000000 |
2 Pipe Size | |||
| 54" | Welded | 00000000 | 000000 |
- For Use With: Natural Gas, Steam, Oil, Water, Air
- Specifications Met: ASTM A733, ASME B1.20.1
- Fittings: Use Class 150 stainless steel
- Flanges: Use Class 150 stainless steel
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.
- 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
- 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
Underground PVC Pipe for Drain, Waste, and Vent
- For Use With: Water
- Max. Temperature: 140° F
- Specifications Met: ASTM D2729
This pipe has thinner walls than Schedule 40 pipe, so it’s lighter in weight and has more space on the inside for high-flow applications, such as underground gravity-flow sewer and storm drainage lines. Pipe is PVC, which has good corrosion resistance. Connect to unthreaded female socket-connect fittings using a PVC primer and cement (also known as solvent weld). Pipe meets ASTM D2729 specifications and testing requirements for material quality.
Warning: Never use plastic pipe fittings and pipe with compressed air or gas.