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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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Low-Pressure Brass and Bronze Threaded Pipe Fittings
Use these fittings in low-pressure flow applications. They have good corrosion resistance. Fittings rated for use with drinking water meet NSF/ANSI 61 safety standards.
Locknuts thread onto the male end of a fitting to provide extra holding power so the fitting won’t loosen from vibration. Locknuts that meet DIN 431 adhere to international standards for locknut dimensions.
NPSL (National Pipe Straight Locknut) threads are compatible with NPT threads.
For technical drawings and 3-D models, click on a part number.
- For Use With: See table
- Class: See table
- Specifications Met: See table
- Pipe Nipples and Pipe: See table
- Flanges: See table
For Pipe | For Flange | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size | Max. Pressure | Class | Material | Schedule | Material | Class | Material | For Use With | Specifications Met | Each | |
NPSL Female | |||||||||||
| 1/8 | 200 psi @ 72° F | 125 | Brass | 40 | Brass | 150 | Brass | Air, Drinking Water, Natural Gas, Oil | ANSI/ASME B16.15, NSF/ANSI 61 | 00000000 | 00000 |
| 1/4 | 200 psi @ 72° F | 125 | Brass | 40 | Brass | 150 | Brass | Air, Drinking Water, Natural Gas, Oil | ANSI/ASME B16.15, NSF/ANSI 61 | 00000000 | 0000 |
| 3/8 | 200 psi @ 72° F | 125 | Brass | 40 | Brass | 150 | Brass | Air, Drinking Water, Natural Gas, Oil | ANSI/ASME B16.15, NSF/ANSI 61 | 00000000 | 0000 |
| 1/2 | 200 psi @ 72° F | 125 | Brass | 40 | Brass | 150 | Brass | Air, Drinking Water, Natural Gas, Oil | ANSI/ASME B16.15, NSF/ANSI 61 | 00000000 | 0000 |
| 3/4 | 200 psi @ 72° F | 125 | Brass | 40 | Brass | 150 | Brass | Air, Drinking Water, Natural Gas, Oil | ANSI/ASME B16.15, NSF/ANSI 61 | 00000000 | 0000 |
| 1 | 200 psi @ 72° F | 125 | Brass | 40 | Brass | 150 | Brass | Air, Drinking Water, Natural Gas, Oil | ANSI/ASME B16.15, NSF/ANSI 61 | 00000000 | 0000 |
| 1 1/4 | 200 psi @ 72° F | 125 | Brass | 40 | Brass | 150 | Brass | Air, Drinking Water, Natural Gas, Oil | ANSI/ASME B16.15, NSF/ANSI 61 | 00000000 | 00000 |
| 1 1/2 | 200 psi @ 72° F | 125 | Brass | 40 | Brass | 150 | Brass | Air, Drinking Water, Natural Gas, Oil | ANSI/ASME B16.15, NSF/ANSI 61 | 00000000 | 00000 |
| 2 | 200 psi @ 72° F | 125 | Brass | 40 | Brass | 150 | Brass | Air, Drinking Water, Natural Gas, Oil | ANSI/ASME B16.15, NSF/ANSI 61 | 00000000 | 00000 |
| 2 1/2 | 200 psi @ 72° F | 125 | Brass | 40 | Brass | 150 | Brass | Air, Natural Gas, Oil | ANSI/ASME B16.15 | 00000000 | 00000 |
| 3 | 200 psi @ 72° F | 125 | Brass | 40 | Brass | 150 | Brass | Air, Natural Gas, Oil | ANSI/ASME B16.15 | 00000000 | 00000 |
| 4 | 200 psi @ 72° F | 125 | Brass | 40 | Brass | 150 | Brass | Air, Natural Gas, Oil | ANSI/ASME B16.15 | 00000000 | 000000 |
BSPP Female | |||||||||||
| 1/8 | Not Rated | __ | Brass | __ | Brass | __ | Brass | Air, Natural Gas, Oil | DIN 431 | 0000000 | 0000 |
| 1/4 | Not Rated | __ | Brass | __ | Brass | __ | Brass | Air, Natural Gas, Oil | DIN 431 | 0000000 | 0000 |
| 3/8 | Not Rated | __ | Brass | __ | Brass | __ | Brass | Air, Natural Gas, Oil | DIN 431 | 0000000 | 0000 |
| 1/2 | Not Rated | __ | Brass | __ | Brass | __ | Brass | Air, Natural Gas, Oil | DIN 431 | 0000000 | 0000 |
| 3/4 | Not Rated | __ | Brass | __ | Brass | __ | Brass | Air, Natural Gas, Oil | DIN 431 | 0000000 | 0000 |
| 1 | Not Rated | __ | Brass | __ | Brass | __ | Brass | Air, Natural Gas, Oil | DIN 431 | 0000000 | 00000 |
| 1 1/4 | Not Rated | __ | Brass | __ | Brass | __ | Brass | Air, Natural Gas, Oil | DIN 431 | 0000000 | 00000 |
| 1 1/2 | Not Rated | __ | Brass | __ | Brass | __ | Brass | Air, Natural Gas, Oil | DIN 431 | 0000000 | 00000 |
Low-Pressure Chrome-Plated Brass Threaded Pipe Fittings
The polished chrome plating not only has a shiny appearance, but also improves corrosion resistance. Also known as Class 125 fittings, these are for use in low-pressure pipe lines.
Locknuts thread onto the male end of a fitting to provide extra holding power so the fitting won’t loosen from vibration.
For technical drawings and 3-D models, click on a part number.
- For Use With: Air, Natural Gas, Oil, Steam, Water
- Class: 125
- Specifications Met: ASTM B456
- Pipe Nipples and Pipe: Use Schedule 40 brass
| Pipe Size | Max. Pressure | Max. Steam Pressure | Each | |
NPT Female | ||||
|---|---|---|---|---|
| 1/8 | 200 psi @ 72° F | 125 psi @ 400° F | 00000000 | 00000 |
| 1/4 | 200 psi @ 72° F | 125 psi @ 400° F | 00000000 | 0000 |
| 3/8 | 200 psi @ 72° F | 125 psi @ 400° F | 00000000 | 0000 |
| 1/2 | 200 psi @ 72° F | 125 psi @ 400° F | 00000000 | 00000 |
| 3/4 | 200 psi @ 72° F | 125 psi @ 400° F | 00000000 | 00000 |
| 1 | 200 psi @ 72° F | 125 psi @ 400° F | 00000000 | 00000 |
High-Pressure Brass Threaded Pipe Fittings
These fittings have the strength to handle high-pressure applications. They are brass for good corrosion resistance.
Locknuts thread onto the male end of a fitting to provide extra holding power so the fitting won’t loosen from vibration.
For technical drawings and 3-D models, click on a part number.
