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 Stainless Steel Threaded Pipe Flanges
Also known as Pressure Class 150 flanges, these are designed for low-pressure pipe applications. Bolt two flat-surface flanges or two raised-surface flanges of the same size together with a gasket (sold separately) to create an access point within a line.
304 stainless steel flanges have very good corrosion resistance.
Forged flanges have better strength than cast flanges. They are also called ANSI flanges.
For technical drawings and 3-D models, click on a part number.
- For Use With: Air, Natural Gas, Oil, Steam, Water
- Pressure Class: 150
- Specifications Met:
Alloy 20 flanges: ASME B16.5
All other flanges: ASME B16.5, ASTM A182 - Fittings: Use Class 150 stainless steel
- Pipe Nipples and Pipe: Use Schedule 40 stainless steel
Bolt Hole | 304/304L Stainless Steel | ||||||||
|---|---|---|---|---|---|---|---|---|---|
Pipe Size | Flange OD | For Bolt Dia. | Dia. | No. of | Bolt Circle Dia. | Max. Pressure | Max. Steam Pressure | Each | |
BSPT | |||||||||
| 1/2 | 3 1/2" | 1/2" | 0.62" | 4 | 2 3/8" | 230 psi @ 72° F | 150 psi @ 360° F | 0000000 | 000000 |
| 3/4 | 3 7/8" | 1/2" | 0.62" | 4 | 2 3/4" | 230 psi @ 72° F | 150 psi @ 360° F | 0000000 | 00000 |
| 1 | 4 1/4" | 1/2" | 0.62" | 4 | 3 1/8" | 230 psi @ 72° F | 150 psi @ 360° F | 0000000 | 00000 |
| 2 | 6" | 5/8" | 0.75" | 4 | 4 3/4" | 230 psi @ 72° F | 150 psi @ 360° F | 0000000 | 000000 |
Low-Pressure Steel Threaded Pipe Flanges
Use these flanges for low-pressure applications in noncorrosive environments. Bolt two flanges of the same size together with a gasket (sold separately) to create an access point within a line.
For technical drawings and 3-D models, click on a part number.
- For Use With: Air, Natural Gas, Oil, Steam, Water
- Pressure Class: 150
- Specifications Met:
NPT: ASME B16.5, ASTM A105, MSS SP-25
BSPT: ASTM A105 - Fittings: Use Class 125 or 150 iron and steel
- Pipe Nipples and Pipe: Use Schedule 40 steel
Bolt Hole | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size | Flange OD | For Bolt Dia. | Dia. | No. of | Bolt Circle Dia. | Max. Pressure | Max. Steam Pressure | Material | Each | |
BSPT | ||||||||||
| 1/2 | 3 1/2" | 1/2" | 5/8" | 4 | 2 3/8" | 285 psi @ 72° F | 230 psi @ 300° F | Steel | 0000000 | 000000 |
| 3/4 | 3 7/8" | 1/2" | 5/8" | 4 | 2 3/4" | 285 psi @ 72° F | 230 psi @ 300° F | Steel | 0000000 | 00000 |
| 1 | 4 1/4" | 1/2" | 5/8" | 4 | 3 1/8" | 285 psi @ 72° F | 230 psi @ 300° F | Steel | 0000000 | 00000 |
| 1 1/4 | 4 5/8" | 1/2" | 5/8" | 4 | 3 1/2" | 285 psi @ 72° F | 230 psi @ 300° F | Steel | 0000000 | 00000 |
| 1 1/2 | 5" | 1/2" | 5/8" | 4 | 3 7/8" | 285 psi @ 72° F | 230 psi @ 300° F | Steel | 0000000 | 00000 |
| 2 | 6" | 5/8" | 3/4" | 4 | 4 3/4" | 285 psi @ 72° F | 230 psi @ 300° F | Steel | 0000000 | 000000 |
| 2 1/2 | 7" | 5/8" | 3/4" | 4 | 5 1/2" | 285 psi @ 72° F | 230 psi @ 300° F | Steel | 0000000 | 000000 |
| 3 | 7 1/2" | 5/8" | 3/4" | 4 | 6" | 285 psi @ 72° F | 230 psi @ 300° F | Steel | 0000000 | 000000 |
| 4 | 9" | 5/8" | 3/4" | 8 | 7 1/2" | 285 psi @ 72° F | 230 psi @ 300° F | Steel | 0000000 | 000000 |
| 6 | 11" | 3/4" | 7/8" | 8 | 9 1/2" | 285 psi @ 72° F | 230 psi @ 300° F | Steel | 0000000 | 000000 |
Low-Pressure Galvanized Steel Threaded Pipe Flanges
- For Use With: Air, Natural Gas, Oil, Steam, Water
- Pressure Class: 150
- Specifications Met: ASTM A123, ASTM A105, ASME B16.5
- Pipe Nipples and Pipe: Use Schedule 40 galvanized steel
- Fittings: Use Class 125 or 150 galvanized iron and galvanized steel
The galvanized finish on these flanges provides fair corrosion resistance. Also known as Pressure Class 150 flanges, they are for use in low-pressure applications. Bolt two same-size flanges together with a gasket (sold separately) to create an access point within a line.
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 | |
BSPT | |||||||||
| 2 | 6" | 3/4" | 3/4" | 4 | 4 3/4" | 285 psi @ 72° F | 150 psi @ 300° F | 000000 | 0000000 |
Medium-Pressure Aluminum Threaded Pipe Fittings
Designed for medium-pressure applications, these fittings have better strength than our low-pressure aluminum pipe fittings. They are lightweight with good corrosion resistance.
For technical drawings and 3-D models, click on a part number.
- For Use With: Air, Oil, Water
- Pipe Nipples and Pipe: Use Schedule 40 aluminum
- For Use With: Air, Oil, Water
- Specifications Met: ASME B1.20.1, ASTM B241
| Pipe Size | Max. Pressure | Each | |
NPT Female × BSPT Male | |||
|---|---|---|---|
| 1/8 | 150 psi @ 72° F | 0000000 | 000000 |
| 1/4 | 150 psi @ 72° F | 0000000 | 00000 |
| 3/8 | 150 psi @ 72° F | 0000000 | 00000 |
| 1/2 | 150 psi @ 72° F | 0000000 | 00000 |
| 3/4 | 150 psi @ 72° F | 0000000 | 00000 |
BSPT Female × NPT Male | |||
| 1/8 | 150 psi @ 72° F | 000000 | 00000 |
| 1/4 | 150 psi @ 72° F | 000000 | 00000 |
| 3/8 | 150 psi @ 72° F | 000000 | 00000 |
| 1/2 | 150 psi @ 72° F | 000000 | 00000 |
| 3/4 | 150 psi @ 72° F | 000000 | 00000 |
| 1 | 150 psi @ 72° F | 000000 | 00000 |
- For Use With: Air, Oil, Water
- Pipe Nipples and Pipe: Use Schedule 40 aluminum
Pipe Size | ||||
|---|---|---|---|---|
| (A) | (B) | Max. Pressure | Each | |
BSPT Male × BSPT Female | ||||
| 1/4 | 1/8 | 250 psi @ 72° F | 0000000 | 000000 |
| 3/8 | 1/4 | 250 psi @ 72° F | 0000000 | 00000 |
| 1/2 | 1/4 | 250 psi @ 72° F | 0000000 | 00000 |
| 1/2 | 3/8 | 250 psi @ 72° F | 0000000 | 00000 |
| 3/4 | 1/2 | 250 psi @ 72° F | 0000000 | 00000 |
| 1 | 3/4 | 250 psi @ 72° F | 0000000 | 00000 |
| 1 1/2 | 1 | 250 psi @ 72° F | 0000000 | 00000 |
| 2 | 1 1/2 | 250 psi @ 72° F | 0000000 | 00000 |
Low-Pressure Brass and Bronze Threaded Pipe Flanges
- For Use With: Air, Drinking Water, Natural Gas, Oil, Steam, Water
- Pressure Class: 150
- Specifications Met:
NPT: ASME B1.20.1, ASME B16.24, ASTM B584, NSF/ANSI 61
BSPT: ASTM B584, BS21 - Pipe Nipples and Pipe: Use Schedule 40 brass
- Fittings:
NPT: Use Class 125 brass
BSPT: Use Class 125 bronze
Also known as Pressure Class 150 flanges, these are designed for low-pressure applications. Bolt two same-size flanges together with a gasket (sold separately) to create an access point within a line. Flanges have good corrosion resistance. To adhere to safety standards for drinking water systems, use flanges that meet NSF/ANSI 61.
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 | Material | Each | |
BSPT | ||||||||||
| 1/2 | 3 1/2" | 1/2" | 5/8" | 4 | 2 3/8" | 200 psi @ 72° F | 125 psi @ 400° F | Bronze | 00000000 | 000000 |
| 3/4 | 3 7/8" | 1/2" | 5/8" | 4 | 2 3/4" | 200 psi @ 72° F | 125 psi @ 400° F | Bronze | 00000000 | 000000 |
| 1 | 4 1/4" | 1/2" | 5/8" | 4 | 3 1/8" | 200 psi @ 72° F | 125 psi @ 400° F | Bronze | 00000000 | 000000 |
| 1 1/2 | 5" | 1/2" | 5/8" | 4 | 3 7/8" | 200 psi @ 72° F | 125 psi @ 400° F | Bronze | 00000000 | 000000 |
| 2 | 6" | 5/8" | 3/4" | 4 | 4 3/4" | 200 psi @ 72° F | 125 psi @ 400° F | Bronze | 00000000 | 000000 |
Plastic Pipe Fittings for Oil
Made of corrosion-resistant plastic, these fittings won’t deteriorate when used in oil applications. They also have high strength and impact resistance. Apply a non-hardening, plastic-compatible sealant to the male threads to prevent leaks. Tape or sealants with PTFE are not recommended for plastic-to-plastic threaded connections. When making a threaded connection be careful not to overtighten the threads. To prevent cracks and leaks, finger tighten the fitting, then wrench-tighten one to two turns.
Warning: Never use plastic pipe fittings and pipe with compressed air or gas.
For technical drawings and 3-D models, click on a part number.
- For Use With: Oil
- Temperature Range: 0° to 230° F
| Pipe Size | Thread Direction | Material | Color | Maximum Pressure | Each | |
BSPT Threads | ||||||
|---|---|---|---|---|---|---|
| 1/2 | Right Hand | Nylon Plastic | White | 200 psi @ 72° F | 00000000 | 00000 |