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 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
- For Use With: Air, Steam, Oil, Water, Natural Gas
- Presure Class:
Steel: 150
Iron: 125 - Pipe Nipples and Pipe: Use Schedule 40 steel
Pipe Size | Plug Construction | Max. Pressure | Max. Steam Pressure | Material | Each | |
NPT Male | ||||||
---|---|---|---|---|---|---|
3 1/2 | Hollow | 175 psi @ 72° F | 125 psi @ 350° F | Iron | 000000000 | 0000000 |
- For Use With:
NPT and BSPT: Air, Natural Gas, Oil, Steam, Water
NPTF: Air, Natural Gas, Steam, Water - Pressure Class:
NPT Iron: 125
BSPT Iron: 150 - Specifications Met:
See table - Pipe Nipples and Pipe:
NPT and BPST: Use Schedule 40 steel
Pipe Size | Plug Construction | Max. Pressure | Max. Steam Pressure | Material | Each | |
NPT Male | ||||||
---|---|---|---|---|---|---|
3 1/2 | Hollow | 175 psi @ 72° F | 125 psi @ 350° F | Iron | 000000000 | 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 | |
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 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 |
- For Use With: Air, Steam, Oil, Water, Natural Gas
- Pressure Class: See table
- Specifications Met:
NPT Steel: SAE J531
NPT Iron: ASME B1.20.1, ASME B16.14, ASTM A126, UL Listed
BSPT: ASTM A197, DIN EN 10226 - Pipe Nipples and Pipe: Use Schedule 40 steel
- Flanges: Use Class 150 galvanized steel
Pipe Size | Plug Construction | Pressure Class | Max. Pressure | Max. Steam Pressure | Material | Each | |
NPT Male | |||||||
---|---|---|---|---|---|---|---|
3 1/2 | Hollow | 125 | 125 psi @ 72° F | 125 psi @ 350° F | Galvanized Iron | 00000000 | 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
Vacuum Fittings for Steel Tubing
- For Use With: Air, Glass, Plastic Pellets, Resins, Wood Chips
- Temperature Range: -10° to 180° F
- Tubing: Galvanized Steel: Use with steel, galvanized steel
Steel: Use with steel
Use these fittings to create an air vacuum system without the hassle of brazing and welding. Insert two fittings into a clamp (sold separately) and tighten to form a secure seal.
Galvanized steel fittings have fair corrosion resistance. Fittings without a finish should only be used in noncorrosive environments.
For technical drawings and 3-D models, click on a part number.
Tapered Caps
These flexible plastic caps are tapered to fit a variety of unthreaded and threaded objects.
For technical drawings and 3-D models, click on a part number.
For OD | For Pipe Size | Inside Ht. | Max. Temp., °F | Color | Pkg. Qty. | Pkg. | |
Flexible Polyethylene Plastic | |||||||
---|---|---|---|---|---|---|---|
3.71"-3.84" | 3 1/2 | 3/4" | 150° | Red | 25 | 00000000 | 000000 |
Hollow Tapered Plugs
The hollow construction allows these plugs to compress for a snug fit in threaded and unthreaded holes of varying diameters. Use the flange to remove them with ease.
For technical drawings and 3-D models, click on a part number.
For Pipe Size | For ID | Ht. | Flange Dia. | Max. Temp., °F | Hardness | Color | Pkg. Qty. | Pkg. | |
Polyethylene Plastic | |||||||||
---|---|---|---|---|---|---|---|---|---|
For NPT Tapered-Thread Pipe | |||||||||
3 1/2 | 3.79"-3.92" | 3/4" | 4 1/8" | 150° | Durometer 45D | Red | 25 | 00000000 | 000000 |
Cleanout Plugs
Close off your drain cleanout pipe with these threaded plugs. Note: If you do not know your pipe size, measure the OD of your existing cleanout plug or the ID of your cleanout fitting and match to the value listed.