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 Fittings
Use these fittings in a low-pressure pipe line.
Fittings that meet ANSI/MSS SP-114 adhere to high-quality standards for heat treating, material thickness, and marking. 304 stainless steel fittings have very good corrosion resistance. 316 stainless steel fittings have excellent corrosion resistance.
Threaded female x butt weld straight adapters are also known as half couplings. Adapters with weld end allow for a permanent connection.
- For Use With: Air, Natural Gas, Oil, Steam, Water
- Pressure Class: 150
- Fabrication: Heat Treated
- Specifications Met:
NPT × Butt Weld: ANSI/MSS SP-114, ASTM A351
BSPT × Butt Weld: ANSI/MSS SP-114 - Pipe Nipples and Pipe: Use Schedule 40 stainless steel
- Flanges: Use Class 150 stainless steel
304 Stainless Steel | 316 Stainless Steel | |||||
|---|---|---|---|---|---|---|
Pipe Size | Max. Pressure | Max. Steam Pressure | Each | Each | ||
NPT Female × Butt Weld | ||||||
| 1/8 | 300 psi @ 72° F | 150 psi @ 350° F | 00000000 | 00000 | 00000000 | 00000 |
| 1/4 | 300 psi @ 72° F | 150 psi @ 350° F | 00000000 | 0000 | 00000000 | 0000 |
| 3/8 | 300 psi @ 72° F | 150 psi @ 350° F | 00000000 | 0000 | 00000000 | 0000 |
| 1/2 | 300 psi @ 72° F | 150 psi @ 350° F | 00000000 | 0000 | 00000000 | 0000 |
| 3/4 | 300 psi @ 72° F | 150 psi @ 350° F | 00000000 | 0000 | 00000000 | 0000 |
| 1 | 300 psi @ 72° F | 150 psi @ 350° F | 00000000 | 0000 | 00000000 | 0000 |
| 1 1/4 | 300 psi @ 72° F | 150 psi @ 350° F | 00000000 | 0000 | 00000000 | 00000 |
| 1 1/2 | 300 psi @ 72° F | 150 psi @ 350° F | 00000000 | 00000 | 00000000 | 00000 |
| 2 | 300 psi @ 72° F | 150 psi @ 350° F | 00000000 | 00000 | 00000000 | 00000 |
| 2 1/2 | 300 psi @ 72° F | 150 psi @ 350° F | 00000000 | 00000 | 00000000 | 00000 |
| 3 | 300 psi @ 72° F | 150 psi @ 350° F | 00000000 | 00000 | 00000000 | 00000 |
| 4 | 300 psi @ 72° F | 150 psi @ 350° F | 00000000 | 00000 | 00000000 | 00000 |
BSPT Female × Butt Weld | ||||||
| 1/8 | 300 psi @ 72° F | 150 psi @ 350° F | 00000000 | 0000 | 000000 | 00 |
| 1/4 | 300 psi @ 72° F | 150 psi @ 350° F | 00000000 | 0000 | 000000 | 00 |
| 3/8 | 300 psi @ 72° F | 150 psi @ 350° F | 00000000 | 0000 | 000000 | 00 |
| 1/2 | 300 psi @ 72° F | 150 psi @ 350° F | 00000000 | 0000 | 000000 | 00 |
| 3/4 | 300 psi @ 72° F | 150 psi @ 350° F | 00000000 | 0000 | 000000 | 00 |
| 1 | 300 psi @ 72° F | 150 psi @ 350° F | 00000000 | 00000 | 000000 | 00 |
| 1 1/2 | 300 psi @ 72° F | 150 psi @ 350° F | 00000000 | 00000 | 000000 | 00 |
| 2 | 300 psi @ 72° F | 150 psi @ 350° F | 00000000 | 00000 | 000000 | 00 |
Premium Low-Pressure Stainless Steel Threaded Pipe Fittings with Certification
Unlike other stainless steel fittings, these are made in the U.S.A. for superior quality. As another marker of quality, they come with a certificate with a traceable lot number and test report that guarantees material composition. All fittings except 1/4" and 3/8" plugs and plugs with hex drive adhere to ANSI/MSS SP-114 standards for heat treating, material thickness, and marking. It’s the highest quality standard for Pressure Class 150 low-pressure stainless steel fittings. They also meet either ASTM A351 or A479 requirements for parts that will be used in pressure systems.
These stainless steel fittings are more corrosion resistant than steel fittings, and almost as strong. 304 stainless steel fittings hold up in humid, damp, and washdown environments but will corrode if exposed to salt water or chemicals. 316 stainless steel fittings are the most corrosion resistant. They stand up to wet environments, just like 304 stainless steel fittings, but unlike 304 stainless steel, they will not corrode from salt water, chlorine solutions, and chemicals.
Certificates with a traceable lot number are available for these products. Download certificates from ORDER HISTORY after your order ships.
- For Use With: Air, Natural Gas, Oil, Steam, Water
- Pressure Class: See table
- Fabrication: Heat Treated
- Specifications Met: See table
- Certification: Material Certificate with Traceable Lot Number
- Pipe Nipples and Pipe: Use Schedule 40 stainless steel
- Flanges: Use Class 150 stainless steel
| Pipe Size | Pressure Class | Max. Pressure | Max. Steam Pressure | Specifications Met | Each | |
304 Stainless Steel | ||||||
|---|---|---|---|---|---|---|
NPT Female × Butt Weld | ||||||
| 1 1/2 | 150 | 300 psi @ 72° F | 150 psi @ 350° F | ANSI/MSS SP-114, ASTM A351 | 000000000 | 000000 |
| 2 | 150 | 300 psi @ 72° F | 150 psi @ 350° F | ANSI/MSS SP-114, ASTM A351 | 000000000 | 00000 |
| 3 | 150 | 300 psi @ 72° F | 150 psi @ 350° F | ANSI/MSS SP-114, ASTM A351 | 000000000 | 000000 |
| 4 | 150 | 300 psi @ 72° F | 150 psi @ 350° F | ANSI/MSS SP-114, ASTM A351 | 000000000 | 000000 |
316 Stainless Steel | ||||||
NPT Female × Butt Weld | ||||||
| 1 1/2 | 150 | 300 psi @ 72° F | 150 psi @ 350° F | ANSI/MSS SP-114, ASTM A351 | 000000000 | 00000 |
| 2 | 150 | 300 psi @ 72° F | 150 psi @ 350° F | ANSI/MSS SP-114, ASTM A351 | 000000000 | 00000 |
| 3 | 150 | 300 psi @ 72° F | 150 psi @ 350° F | ANSI/MSS SP-114, ASTM A351 | 000000000 | 000000 |
| 4 | 150 | 300 psi @ 72° F | 150 psi @ 350° F | ANSI/MSS SP-114, ASTM A351 | 000000000 | 000000 |
Medium-Pressure Stainless Steel Threaded Pipe Fittings
Choose these fittings when you want the same high-quality found in our low-pressure pipe fittings, but need more strength to handle higher pressures.
Fittings that meet ANSI/MSS SP-114 adhere to high-quality standards for heat treating, material thickness, and marking.
304 stainless steel fittings have very good corrosion resistance.
316 stainless steel fittings have excellent corrosion resistance.
Threaded female x butt weld straight adapters are also known as half couplings.
- For Use With: Air, Natural Gas, Oil, Steam, Water
- Pressure Class : 1000
- Specifications Met: ANSI/MSS SP-114, ASTM A182
- Pipe Nipples and Pipe: Use Schedule 40 stainless steel
- Flanges: Use Class 150 stainless steel
304 Stainless Steel | 316 Stainless Steel | |||||
|---|---|---|---|---|---|---|
| Pipe Size | Max. Pressure | Max. Steam Pressure | Each | Each | ||
NPT Female × Butt Weld | ||||||
| 1/8 | 1,000 psi @ 72° F | 650 psi @ 350° F | 00000000 | 00000 | 00000000 | 00000 |
| 1/4 | 1,000 psi @ 72° F | 650 psi @ 350° F | 00000000 | 0000 | 00000000 | 0000 |
| 3/8 | 1,000 psi @ 72° F | 650 psi @ 350° F | 00000000 | 0000 | 00000000 | 0000 |
| 1/2 | 1,000 psi @ 72° F | 650 psi @ 350° F | 00000000 | 0000 | 00000000 | 0000 |
| 3/4 | 1,000 psi @ 72° F | 650 psi @ 350° F | 00000000 | 0000 | 00000000 | 0000 |
| 1 | 1,000 psi @ 72° F | 650 psi @ 350° F | 00000000 | 00000 | 00000000 | 00000 |
| 1 1/4 | 1,000 psi @ 72° F | 650 psi @ 350° F | 0000000 | 00000 | 00000000 | 00000 |
| 1 1/2 | 1,000 psi @ 72° F | 650 psi @ 350° F | 0000000 | 00000 | 00000000 | 00000 |
| 2 | 1,000 psi @ 72° F | 650 psi @ 350° F | 0000000 | 00000 | 00000000 | 00000 |
| 2 1/2 | 1,000 psi @ 72° F | 650 psi @ 350° F | 00000000 | 00000 | 00000000 | 00000 |
| 3 | 1,000 psi @ 72° F | 650 psi @ 350° F | 00000000 | 000000 | 00000000 | 000000 |
| 4 | 1,000 psi @ 72° F | 650 psi @ 350° F | 00000000 | 000000 | 00000000 | 000000 |
High-Pressure Stainless Steel Threaded Pipe Fittings
Use these heavy duty fittings in high-pressure flow applications.
304 stainless steel fittings have very good corrosion resistance. 316 stainless steel fittings have excellent corrosion resistance. Threaded female x butt weld straight adapters are also known as half couplings.
- For Use With: Air, Hydraulic Fluid, Natural Gas, Oil, Steam, Water
- Pressure Class: 3000
- Specifications Met: ASTM A182, ASME B16.11
- Pipe Nipples and Pipe: Use Schedule 80 stainless steel
| Pipe Size | Dash Size | Max. Pressure | Max. Steam Pressure | Each | |
304 Stainless Steel | |||||
|---|---|---|---|---|---|
NPT Female × Butt Weld | |||||
| 1/8 | 02 | 2,500 psi @ 72° F | 1,900 psi @ 350° F | 000000000 | 00000 |
| 1/4 | 04 | 2,500 psi @ 72° F | 1,900 psi @ 350° F | 000000000 | 0000 |
| 3/8 | 06 | 2,500 psi @ 72° F | 1,900 psi @ 350° F | 000000000 | 00000 |
| 1/2 | 08 | 2,500 psi @ 72° F | 1,900 psi @ 350° F | 000000000 | 00000 |
| 3/4 | 12 | 2,500 psi @ 72° F | 1,900 psi @ 350° F | 000000000 | 00000 |
| 1 | 16 | 2,500 psi @ 72° F | 1,900 psi @ 350° F | 000000000 | 00000 |
| 1 1/4 | 20 | 2,500 psi @ 72° F | 1,900 psi @ 350° F | 000000000 | 00000 |
| 1 1/2 | 24 | 2,500 psi @ 72° F | 1,900 psi @ 350° F | 000000000 | 00000 |
| 2 | 32 | 2,500 psi @ 72° F | 1,900 psi @ 350° F | 000000000 | 00000 |
| 2 1/2 | 40 | 2,500 psi @ 72° F | 1,900 psi @ 350° F | 000000000 | 000000 |
| 3 | 48 | 2,500 psi @ 72° F | 1,900 psi @ 350° F | 000000000 | 000000 |
316 Stainless Steel | |||||
NPT Female × Butt Weld | |||||
| 1/8 | 02 | 3,000 psi @ 72° F | 2,800 psi @ 350° F | 00000000 | 00000 |
| 1/4 | 04 | 3,000 psi @ 72° F | 2,800 psi @ 350° F | 00000000 | 00000 |
| 3/8 | 06 | 3,000 psi @ 72° F | 2,800 psi @ 350° F | 00000000 | 00000 |
| 1/2 | 08 | 3,000 psi @ 72° F | 2,800 psi @ 350° F | 00000000 | 00000 |
| 3/4 | 12 | 3,000 psi @ 72° F | 2,800 psi @ 350° F | 00000000 | 00000 |
| 1 | 16 | 3,000 psi @ 72° F | 2,800 psi @ 350° F | 00000000 | 00000 |
| 1 1/4 | 20 | 3,000 psi @ 72° F | 2,800 psi @ 350° F | 00000000 | 00000 |
| 1 1/2 | 24 | 3,000 psi @ 72° F | 2,800 psi @ 350° F | 00000000 | 000000 |
| 2 | 32 | 3,000 psi @ 72° F | 2,800 psi @ 350° F | 00000000 | 000000 |
| 2 1/2 | 40 | 3,000 psi @ 72° F | 2,800 psi @ 350° F | 00000000 | 000000 |
| 3 | 48 | 3,000 psi @ 72° F | 2,800 psi @ 350° F | 00000000 | 000000 |
High-Pressure Socket-Connect Stainless Steel Unthreaded Pipe Fittings
Forged for excellent strength, these heavy duty socket-connect fittings stand up to high-pressure applications. They are easier to weld than butt-weld fittings because the fitting doesn’t need to align perfectly to the pipe. Slide pipe into the socket and weld for a strong, permanent connection.
304 stainless steel fittings have very good corrosion resistance. 316 stainless steel fittings have excellent corrosion resistance.
Socket connect x butt weld straight adapters are also known as half couplings.
- For Use With: Air, Hydraulic Fluid, Natural Gas, Oil, Steam, Water
- Pressure Class: 3000
- Specifications Met: ASME B16.11, ASTM A182
- Pipe Nipples and Pipe: Use Schedule 80 stainless steel
| Pipe Size | Dash Size | Max. Steam Pressure | Max. Pressure | Each | |
304/304L Stainless Steel | |||||
|---|---|---|---|---|---|
Socket Connect × Butt Weld | |||||
| 1/8 | 02 | 1,900 psi @ 350° F | 2,500 psi @ 72° F | 000000000 | 000000 |
| 1/4 | 04 | 1,900 psi @ 350° F | 2,500 psi @ 72° F | 000000000 | 00000 |
| 3/8 | 06 | 1,900 psi @ 350° F | 2,500 psi @ 72° F | 000000000 | 00000 |
| 1/2 | 08 | 1,900 psi @ 350° F | 2,500 psi @ 72° F | 000000000 | 00000 |
| 3/4 | 12 | 1,900 psi @ 350° F | 2,500 psi @ 72° F | 000000000 | 00000 |
| 1 | 16 | 1,900 psi @ 350° F | 2,500 psi @ 72° F | 000000000 | 00000 |
| 1 1/2 | 24 | 1,900 psi @ 350° F | 2,500 psi @ 72° F | 000000000 | 00000 |
| 2 | 32 | 1,900 psi @ 350° F | 2,500 psi @ 72° F | 000000000 | 000000 |
316/316L Stainless Steel | |||||
Socket Connect × Butt Weld | |||||
| 1/8 | 02 | 1,900 psi @ 350° F | 3,000 psi @ 72° F | 000000000 | 00000 |
| 1/4 | 04 | 1,900 psi @ 350° F | 3,000 psi @ 72° F | 000000000 | 00000 |
| 3/8 | 06 | 1,900 psi @ 350° F | 3,000 psi @ 72° F | 000000000 | 00000 |
| 1/2 | 08 | 1,900 psi @ 350° F | 3,000 psi @ 72° F | 000000000 | 00000 |
| 3/4 | 12 | 1,900 psi @ 350° F | 3,000 psi @ 72° F | 000000000 | 00000 |
| 1 | 16 | 1,900 psi @ 350° F | 3,000 psi @ 72° F | 000000000 | 00000 |
| 2 | 32 | 1,900 psi @ 350° F | 3,000 psi @ 72° F | 000000000 | 000000 |