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.
Reducing flanges allow you to transition your system to a smaller pipe size; attach to a flange with a larger pipe size but with the same flange dimensions.
- For Use With:
1/4 Pipe Size: Air, Natural Gas, Oil, Water
All other sizes: Air, Natural Gas, Oil, Steam, Water - Specifications Met:
1/4 Pipe Size: ASTM A105, MSS SP-6
All other sizes: ASME B16.5, ASTM A105, MSS SP-25, MSS SP-6 - Fittings: Use Class 125 or 150 iron and steel
- Pipe Nipples and Pipe: Use Schedule 40 Steel
Bolt Hole | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
Pipe Size | For Flange Pipe Size | Flange OD | For Bolt Dia. | Dia. | No. of | Bolt Circle Dia. | Max. Pressure | Material | Each | |
NPT | ||||||||||
| 1/4 | 1 | 4 1/4" | 1/2" | 5/8" | 4 | 3.12" | Not Rated | Steel | 0000000 | 000000 |
Low-Pressure Iron and Steel Threaded Pipe Fittings
Use these fittings for low-pressure applications in noncorrosive environments.
Adapters for tanks create an inlet or outlet connection on the surface of any tank, pressure vessel, or drum. Adapters with weld end allow for a permanent connection. Adapters with extension fit tightly into the hole, which keeps the fitting steady during welding.
- For Use With: Diesel Fuel, Gasoline, Oil, Water
- Specifications Met: ASTM A105, ASTM A181
| Pipe Size | For Hole Dia. | OD | Lg. | Material | Each | |
NPT Female × Weld | ||||||
|---|---|---|---|---|---|---|
| 1/4 | 3/4" | 1 1/4" | 5/16" | Carbon Steel | 00000000 | 00000 |
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. 316 stainless steel flanges have excellent corrosion resistance.
Forged flanges have better strength than cast flanges. They are also called ANSI flanges.
Reducing flanges allow you to transition your system to a smaller pipe size; attach to a flange with a larger pipe size but with the same flange dimensions.
- For Use With: Air, Natural Gas, Oil, Steam, Water
- Pressure Class: 150
- Specifications Met: ASTM A182, ASME B16.5
- Pipe Nipples and Pipe: Use Schedule 40 stainless steel
- Fittings: Use Class 150 stainless steel
Bolt Hole | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size | For Flange Pipe Size | Flange OD | For Bolt Dia. | Dia. | No. of | Bolt Circle Dia. | Max. Pressure | Max. Steam Pressure | Each | |
304/304L Stainless Steel | ||||||||||
NPT | ||||||||||
| 1/4 | 1 | 4 1/4" | 1/2" | 0.62" | 4 | 3 1/8" | 230 psi @ 72° F | 150 psi @ 360° F | 000000000 | 000000 |
316/316L Stainless Steel | ||||||||||
NPT | ||||||||||
| 1/4 | 1 | 4 1/4" | 1/2" | 0.62" | 4 | 3 1/8" | 230 psi @ 72° F | 150 psi @ 360° F | 00000000 | 00000 |
Low-Pressure Stainless Steel Threaded Pipe Fittings
Use these fittings in a low-pressure pipe line. 316 stainless steel fittings have excellent corrosion resistance. Adapters with weld end allow for a permanent connection.
Adapters for tanks create an inlet or outlet connection on the surface of any tank, pressure vessel, or drum. Adapters with extension fit tightly into the hole, which keeps the fitting steady during welding.
- For Use With: Water, Oil, Gasoline, Diesel Fuel
- Specifications Met: ASTM A182, ASME B1.20.1
316 Stainless Steel | |||||
|---|---|---|---|---|---|
| Pipe Size | For Hole Dia. | OD | Lg. | Each | |
NPT Female × Weld | |||||
| 1/4 | 15/16" | 1 1/2" | 5/16" | 0000000 | 000000 |
Low-Pressure Aluminum Threaded Pipe Fittings
In addition to being lightweight, these aluminum fittings offer good corrosion resistance. Use them in low-pressure flow applications. To prevent cracking, do not tighten more than a 1/4-turn past hand tight.
Adapters for tanks weld onto the surface of any tank, pressure vessel, or drum to create a permanent inlet or outlet connection. Adapters with extended lip fit tightly into the hole, which keeps the fitting steady during welding.
- For Use With: Water, Oil, Gasoline, Diesel Fuel
- Specifications Met: ASTM B221
- Pipe Nipples and Pipe: Use Schedule 40 aluminum
| Pipe Size | For Hole Dia. | OD | Lg. | Each | |
NPT Female × Weld | |||||
|---|---|---|---|---|---|
| 1/4 | 7/8" | 1 5/16" | 1/4" | 0000000 | 000000 |
Spin-Weld Through-Wall Plastic Tank Fittings
Create a leak-free, durable connection in plastic tanks, walls, or panels without gaskets or sealants. As you spin these fittings with a handheld electric router, they melt into the surface of your tank for a seal without any joints. To hold these fittings in your router, you’ll need the installation tool (sold separately).
For proper installation, you’ll want to use a hole saw to drill a hole that matches the For Hole Diameter listed and check that your router meets the speed and power requirements shown in the table.
- For Use With: Oil, Water
- Temperature Range: 40° to 140° F
For Tank | For Router | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size | For Hole Dia. | For Min. Wall Thick. | Lg. | Material | Material | Surface | Color | Power | Speed, rpm | Each | |
NPT Female Threaded Pipe × Weld | |||||||||||
| 1/4 | 0.88" | 3/16" | 15/16" | LDPE Plastic | LDPE Plastic | Flat | White | 1 1/2 | 18,000-25,000 | 0000000 | 00000 |
| For Pipe Size | Shank Dia. | Overall Lg. | Material | Shank Type | For Tool Type | Each | |
For Pipe Connection | |||||||
|---|---|---|---|---|---|---|---|
| 1/4 | 1/4" | 1 5/8" | Aluminum | Straight | Hand Router | 000000 | 0000000 |