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 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 | |
NPT | ||||||||||
3 1/2 | 8 1/2" | 5/8" | 3/4" | 8 | 7" | 285 psi @ 72° F | 230 psi @ 300° F | Steel | 000000000 | 0000000 |
Low-Pressure Iron and Steel Threaded Pipe Fittings
Use these fittings for low-pressure applications in noncorrosive environments.
For technical drawings and 3-D models, click on a part number.
- For Use With: Air, Steam, Oil, Water, Natural Gas
- Pressure Class: See table
- Pipe Nipples and Pipe: Use Schedule 40 steel
- Specifications Met: See table
Pipe Size | ||||||||
---|---|---|---|---|---|---|---|---|
(A) | (B) | Pressure Class | Max. Pressure | Max. Steam Pressure | Material | Specifications Met | Each | |
NPT Male × NPT Female | ||||||||
3 1/2 | 1 | 125 | 175 psi @ 72° F | 125 psi @ 350° F | Iron | ASME B16.14 | 000000000 | 000000 |
3 1/2 | 1 1/4 | 125 | 175 psi @ 72° F | 125 psi @ 350° F | Iron | ASME B16.14 | 000000000 | 00000 |
3 1/2 | 1 1/2 | 125 | 175 psi @ 72° F | 125 psi @ 350° F | Iron | ASME B16.14 | 000000000 | 00000 |
3 1/2 | 2 | 125 | 175 psi @ 72° F | 125 psi @ 350° F | Iron | ASME B16.14 | 000000000 | 00000 |
3 1/2 | 2 1/2 | 125 | 175 psi @ 72° F | 125 psi @ 350° F | Iron | ASME B16.14 | 000000000 | 00000 |
3 1/2 | 3 | 125 | 175 psi @ 72° F | 125 psi @ 350° F | Iron | ASME B16.14 | 000000000 | 00000 |
4 | 3 1/2 | 150 | 150 psi @ 72° F | 150 psi @ 350° F | Iron | ASME B16.14 | 000000000 | 00000 |
- For Use With: Air, Steam, Oil, Water, Natural Gas
- Pressure Class: 150
- Specifications Met:
NPT: ASME B1.20.1, ASME B16.3, UL Listed
BSPT: DIN EN 10226 - Pipe Nipples and Pipe: Use Schedule 40 steel
Low-Pressure Galvanized Iron and Steel Threaded Pipe Fittings
The galvanized finish on these fittings provides fair corrosion resistance. Fittings are for use in low-pressure applications.
For technical drawings and 3-D models, click on a part number.
- For Use With: Air, Steam, Oil, Water, Natural Gas
- Pressure Class: See table
- Specifications Met: See table
- Pipe Nipples and Pipe: Use Schedule 40 galvanized steel
- Flanges: Use Class 150 galvanized steel
Pipe Size | ||||||||
---|---|---|---|---|---|---|---|---|
(A) | (B) | Pressure Class | Max. Pressure | Max. Steam Pressure | Material | Specifications Met | Each | |
NPT Male × NPT Female | ||||||||
4 | 3 1/2 | 150 | 150 psi @ 72° F | 150 psi @ 350° F | Galvanized Iron | ASME B16.14 | 00000000 | 0000000 |
3 1/2 | 1 | 125 | 125 psi @ 72° F | 125 psi @ 350° F | Galvanized Iron | ASME B1.20.1, ASME B16.14, ASTM A126, UL Listed | 00000000 | 000000 |
3 1/2 | 1 1/4 | 125 | 125 psi @ 72° F | 125 psi @ 350° F | Galvanized Iron | ASME B1.20.1, ASME B16.14, ASTM A126, UL Listed | 00000000 | 000000 |
3 1/2 | 1 1/2 | 125 | 125 psi @ 72° F | 125 psi @ 350° F | Galvanized Iron | ASME B1.20.1, ASME B16.14, ASTM A126, UL Listed | 00000000 | 000000 |
3 1/2 | 2 | 125 | 125 psi @ 72° F | 125 psi @ 350° F | Galvanized Iron | ASME B1.20.1, ASME B16.14, ASTM A126, UL Listed | 00000000 | 000000 |
3 1/2 | 3 | 125 | 125 psi @ 72° F | 125 psi @ 350° F | Galvanized Iron | ASME B1.20.1, ASME B16.14, ASTM A126, UL Listed | 00000000 | 000000 |
FM-Approved Low-Pressure Cast Iron Unthreaded Pipe Flanges
- For Use With: Air, Diesel Fuel, Gasoline, Natural Gas, Oil, Steam, Water
- Pressure Class: 125
- Specifications Met: ASME B1.20.1, ASME B16.1, ASTM A126, FM Approved
- Pipe Nipples and Pipe: Use Schedule 40 steel
- Fittings: Use Class 125 or 150 iron and steel
FM-approved for fire protection applications, these flanges are cast iron, so they're brittle and can be quickly opened by hitting them with a sledge hammer. Bolt them together with a gasket (not included) to create an access point within a low-pressure pipe line. All are cap flanges, which are also known as blind flanges. Use them in noncorrosive environments.
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 | |
3 1/2 | 8 1/2" | 5/8" | 3/4" | 8 | 7" | 200 psi @ 72° F | 165 psi @ 300° F | 0000000 | 0000000 |
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.
For technical drawings and 3-D models, click on a part number.
- For Use With:
Brass: Air, Drinking Water, Natural Gas, Oil
Bronze: Air, Natural Gas, Oil, Steam, Water - Pressure Class: 125
- Specifications Met: See table
- Pipe Nipples and Pipe: Use Schedule 40 brass
- Flanges: See table
Low-Pressure Quick-Lock Clamp-On Connectors for Air
- For Use With: Air
- Temperature Range: -30° to 180° F
- For Pipe Material: Stainless Steel, Iron, Steel, Aluminum, Copper, PVC Plastic, CPVC Plastic
A turn of the T-handle will tighten and loosen these connectors, so you can quickly disassemble and reassemble your lines without tools. Use connectors to join pieces of rigid pipe of the same or different materials. They are commonly used in gravity-flow systems and low-pressure air and vacuum conveying systems. Connectors have a metal strip that provides an escape route for electrostatic buildup when used in a fully grounded system.
For technical drawings and 3-D models, click on a part number.
For Pipe OD | For Pipe Size | Lg. | Max. Pressure | Max. Vacuum | Material | Gasket Material | Each | |
4" | 3 1/2 | 4" | 15 psi @ 72° F | 15 in. of Hg @ 72° F | 304 Stainless Steel | Gum Rubber | 0000000 | 000000 |
Low-Pressure Clamp-On Connectors for Air
- For Use With: Air
- Temperature Range:
Neoprene Rubber Gasket: -20° to 190° F
Silicone Rubber Gasket: -100° to 500° F - For Pipe Material: Stainless Steel, Iron, Steel, Aluminum, Copper, PVC Plastic, CPVC Plastic
Tighten the bolts on these connectors to join two pieces of rigid pipe of the same or different materials. They are for use in low-pressure air and vacuum conveying systems, as well as in gravity-flow systems. Connectors have a stainless steel strip that provides an escape route for electrostatic buildup when used in a fully grounded system.
Connectors with sleeve have an inner lining that protects the gasket.
For technical drawings and 3-D models, click on a part number.
For Pipe OD | For Pipe Size | Lg. | No. of Bolts | Max. Pressure | Max. Vacuum | Material | Nut Material | Bolt Material | Each | |
Neoprene Rubber Gasket | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|
Connectors with 304 Stainless Steel Sleeve | ||||||||||
4" | 3 1/2 | 8" | 4 | 15 psi @ 72° F | 15 in. of Hg @ 72° F | Galvanized Steel | Zinc-Plated Steel | Zinc-Plated Steel | 0000000 | 000000 |
Silicone Rubber Gasket | ||||||||||
Connectors with 304 Stainless Steel Sleeve | ||||||||||
4" | 3 1/2 | 8" | 4 | 15 psi @ 72° F | 15 in. of Hg @ 72° F | Galvanized Steel | Zinc-Plated Steel | Zinc-Plated Steel | 0000000 | 00000 |