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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High-Pressure Galvanized Steel Threaded Pipe Fittings
A galvanized finish gives these fittings better corrosion resistance than our plain steel high-pressure fittings. Also known as Pressure Class 3000 fittings, they have excellent strength to handle high-pressure applications.
For technical drawings and 3-D models, click on a part number.
- For Use With: Air, Hydraulic Fluid, Natural Gas, Oil, Steam, Water
- Pressure Class: 3000
- Specifications Met: ASME B1.20.1, ASME B16.11, ASTM A105, ASTM B633
- Pipe Nipples and Pipe: Use Schedule 160 steel
Pipe Size | Dash Size | Max. Pressure | Max. Steam Pressure | Each | |
NPT Female | |||||
|---|---|---|---|---|---|
| 1/8 | 02 | 3,000 psi @ 72° F | 300 psi @ 360° F | 00000000 | 00000 |
| 1/4 | 04 | 3,000 psi @ 72° F | 300 psi @ 360° F | 00000000 | 0000 |
| 3/8 | 06 | 3,000 psi @ 72° F | 300 psi @ 360° F | 00000000 | 0000 |
| 1/2 | 08 | 3,000 psi @ 72° F | 300 psi @ 360° F | 00000000 | 0000 |
| 3/4 | 12 | 3,000 psi @ 72° F | 300 psi @ 360° F | 00000000 | 0000 |
| 1 | 16 | 3,000 psi @ 72° F | 300 psi @ 360° F | 00000000 | 00000 |
| 1 1/4 | 20 | 3,000 psi @ 72° F | 300 psi @ 360° F | 00000000 | 00000 |
| 1 1/2 | 24 | 3,000 psi @ 72° F | 300 psi @ 360° F | 00000000 | 00000 |
| 2 | 32 | 3,000 psi @ 72° F | 300 psi @ 360° F | 00000000 | 00000 |
- For Use With: Air, Hydraulic Fluid, Natural Gas, Oil, Steam, Water
- Specifications Met: ASME B1.20.1, ASME B16.11, ASTM A105, ASTM B633
- Pipe Nipples and Pipe: Use Schedule 160 steel
| Pressure Class | Pipe Size | Dash Size | Plug Construction | Max. Pressure | Max. Steam Pressure | Each | |
NPT Male | |||||||
|---|---|---|---|---|---|---|---|
| 3000 | 1/8 | 02 | Solid | 3,000 psi @ 72° F | 300 psi @ 360° F | 00000000 | 00000 |
| 3000 | 1/4 | 04 | Solid | 3,000 psi @ 72° F | 300 psi @ 360° F | 00000000 | 0000 |
| 3000 | 3/8 | 06 | Solid | 3,000 psi @ 72° F | 300 psi @ 360° F | 00000000 | 0000 |
| 3000 | 1/2 | 08 | Solid | 3,000 psi @ 72° F | 300 psi @ 360° F | 00000000 | 0000 |
| 3000 | 3/4 | 12 | Solid | 3,000 psi @ 72° F | 300 psi @ 360° F | 00000000 | 0000 |
| 3000 | 1 | 16 | Solid | 3,000 psi @ 72° F | 300 psi @ 360° F | 00000000 | 0000 |
| 3000 | 1 1/4 | 20 | Solid | 3,000 psi @ 72° F | 300 psi @ 360° F | 00000000 | 0000 |
| 3000 | 1 1/2 | 24 | Solid | 3,000 psi @ 72° F | 300 psi @ 360° F | 00000000 | 00000 |
| 3000 | 2 | 32 | Solid | 3,000 psi @ 72° F | 300 psi @ 360° F | 00000000 | 00000 |
Medium-Pressure Galvanized Iron and Steel Threaded Pipe Fittings
A galvanized finish gives these fittings fair corrosion resistance. They have the strength to handle medium-pressure applications.
Plugs with external hex drive and plugs with round body are also known as bull plugs; the center is hollow, which allows fluid to put pressure on the threads for a tight seal.
For technical drawings and 3-D models, click on a part number.
- For Use With: Air, Natural Gas, Oil, Steam, Water
- Specifications Met: ASME B31.1, ASME B31.3, ASTM A234, ASTM B633, MSS SP-95, ASME B1.20.1
- Pipe Nipples and Pipe: Use Schedule 80 steel
- Flanges: Use Class 300 steel
| Pipe Size | Plug Construction | Material | Each | |
NPT Male | ||||
|---|---|---|---|---|
| 1/8 | Hollow | Galvanized Steel | 0000000 | 000000 |
| 1/4 | Hollow | Galvanized Steel | 0000000 | 00000 |
| 3/8 | Hollow | Galvanized Steel | 0000000 | 00000 |
| 1 1/4 | Hollow | Galvanized Steel | 0000000 | 00000 |
| 1 1/2 | Hollow | Galvanized Steel | 0000000 | 00000 |
| 2 | Hollow | Galvanized Steel | 0000000 | 000000 |
| 4 | Hollow | Galvanized Steel | 0000000 | 000000 |
Extreme-Pressure Steel Threaded Pipe Fittings
The strongest steel fittings we offer, these can withstand extreme-pressure applications.
Galvanized and zinc-plated steel fittings have better corrosion resistance than plain steel fittings. UN/UNF (SAE Straight) male threads have a gasket to protect against leaks. They are also known as O-ring boss threads.
For technical drawings and 3-D models, click on a part number.
(SAE Straight) Male
Threads with Gasket
- For Use With: Air, Hydraulic Fluid, Natural Gas, Oil, Steam, Water
- Temperature Range:
Buna-N Rubber: -20° to 200° F
Fluoroelastomer Rubber: -4° to 400° F - Specifications Met: ASTM B633, SAE J1926
- Pipe Nipples and Pipe: Use Schedule XXH steel
- Flanges: Use Class 1500 steel
Buna-N Rubber Gasket | Fluoroelastomer Rubber Gasket | |||||||
|---|---|---|---|---|---|---|---|---|
| Thread Size | Dash Size | Drive Size | Max. Pressure | Material | Each | Each | ||
UN/UNF (SAE Straight) Male | ||||||||
| 5/16"-24 | 02 | 1/8" | 5,500 psi @ 72° F | Zinc-Plated Steel | 0000000 | 00000 | 0000000 | 00000 |
| 7/16"-20 | 04 | 3/16" | 5,000 psi @ 72° F | Zinc-Plated Steel | 0000000 | 0000 | 0000000 | 0000 |
| 9/16"-18 | 06 | 1/4" | 4,000 psi @ 72° F | Zinc-Plated Steel | 0000000 | 0000 | 0000000 | 0000 |
| 3/4"-16 | 08 | 5/16" | 3,500 psi @ 72° F | Zinc-Plated Steel | 0000000 | 0000 | 0000000 | 0000 |
| 7/8"-14 | 10 | 3/8" | 2,700 psi @ 72° F | Zinc-Plated Steel | 0000000 | 0000 | 0000000 | 0000 |
| 1 1/16"-12 | 12 | 9/16" | 2,200 psi @ 72° F | Zinc-Plated Steel | 0000000 | 0000 | 0000000 | 0000 |
| 1 5/16"-12 | 16 | 5/8" | 2,000 psi @ 72° F | Zinc-Plated Steel | 0000000 | 00000 | 0000000 | 00000 |
| 1 5/8"-12 | 20 | 3/4" | 1,600 psi @ 72° F | Zinc-Plated Steel | 0000000 | 00000 | 0000000 | 00000 |
| 1 7/8"-12 | 24 | 3/4" | 1,200 psi @ 72° F | Zinc-Plated Steel | 0000000 | 00000 | 0000000 | 00000 |