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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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. 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.
For technical drawings and 3-D models, click on a part number.
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: 150
- 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
316 Stainless Steel | ||||||
|---|---|---|---|---|---|---|
| Pipe Size  | Drive Size | Max. Pressure | Max. Steam Pressure | Specifications Met | Each | |
NPTF Male | ||||||
| 1/4 | 1/4" | 270 psi @ 72° F | 150 psi @ 350° F | ASME B16.14, ASTM A479, SAE J405 | 0000000 | 00000 |
| 3/8 | 5/16" | 270 psi @ 72° F | 150 psi @ 350° F | ASME B16.14, ASTM A479, SAE J405 | 0000000 | 0000 |
| 1/2 | 3/8" | 270 psi @ 72° F | 150 psi @ 350° F | ASME B16.14, ASTM A479, SAE J405 | 0000000 | 0000 |
| 3/4 | 9/16" | 270 psi @ 72° F | 150 psi @ 350° F | ASME B16.14, ASTM A479, SAE J405 | 0000000 | 00000 |
| 1 | 5/8" | 270 psi @ 72° F | 150 psi @ 350° F | ASME B16.14, ASTM A276, ASTM A479 | 0000000 | 00000 |
| 1 1/4 | 3/4" | 270 psi @ 72° F | 150 psi @ 350° F | ASME B16.14, ASTM A276, ASTM A479 | 0000000 | 00000 |
| 1 1/2 | 1" | 270 psi @ 72° F | 150 psi @ 350° F | ASME B16.14, ASTM A276, ASTM A479 | 0000000 | 00000 |
| 2 | 1" | 270 psi @ 72° F | 150 psi @ 350° F | ASME B16.14, ASTM A276, ASTM A479 | 0000000 | 00000 |
- 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
316 Stainless Steel | |||||||
|---|---|---|---|---|---|---|---|
| Pipe Size | Drive Size | Pressure Class | Max. Pressure | Max. Steam Pressure | Specifications Met | Each | |
NPTF Male | |||||||
| 1/4 | 9/16" | 150 | 270 psi @ 72° F | 150 psi @ 350° F | ASTM A479, SAE J405, SAE J531 | 0000000 | 00000 |
| 3/8 | 11/16" | 150 | 270 psi @ 72° F | 150 psi @ 350° F | ASTM A479, SAE J405, SAE J531 | 0000000 | 0000 |
| 1/2 | 7/8" | 1000 | 1,000 psi @ 72° F | 650 psi @ 350° F | ANSI/MSS SP-114, ASTM A276, ASTM A479 | 0000000 | 00000 |
| 3/4 | 1 1/16" | 1000 | 1,000 psi @ 72° F | 650 psi @ 350° F | ANSI/MSS SP-114, ASTM A276, ASTM A479 | 0000000 | 00000 |
| 1 | 1 5/16" | 1000 | 1,000 psi @ 72° F | 650 psi @ 350° F | ANSI/MSS SP-114, ASTM A276, ASTM A479 | 0000000 | 00000 |
| 1 1/4 | 1 3/4" | 1000 | 1,000 psi @ 72° F | 650 psi @ 350° F | ANSI/MSS SP-114, ASTM A276, ASTM A479 | 0000000 | 00000 |
| 1 1/2 | 2" | 1000 | 1,000 psi @ 72° F | 650 psi @ 350° F | ANSI/MSS SP-114, ASTM A276, ASTM A479 | 0000000 | 00000 |
| 2 | 2 1/2" | 1000 | 1,000 psi @ 72° F | 650 psi @ 350° F | ANSI/MSS SP-114, ASTM A276, ASTM A479 | 0000000 | 00000 |
- 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
316 Stainless Steel | ||||||
|---|---|---|---|---|---|---|
| Pipe Size | Pressure Class | Max. Pressure | Max. Steam Pressure | Specifications Met | Each | |
NPTF Male | ||||||
| 1/4 | 150 | 270 psi @ 72° F | 150 psi @ 350° F | ASME B16.14, ASTM A479, SAE J405 | 0000000 | 00000 |
| 3/8 | 150 | 270 psi @ 72° F | 150 psi @ 350° F | ASME B16.14, ASTM A479, SAE J405 | 0000000 | 0000 |
| 1/2 | 1000 | 1,000 psi @ 72° F | 650 psi @ 350° F | ANSI/MSS SP-114, ASME B16.14, ASTM A479, SAE J405 | 0000000 | 00000 |
| 3/4 | 1000 | 1,000 psi @ 72° F | 650 psi @ 350° F | ANSI/MSS SP-114, ASME B16.14, ASTM A479, SAE J405 | 0000000 | 00000 |
| 1 | 1000 | 1,000 psi @ 72° F | 650 psi @ 350° F | ANSI/MSS SP-114, ASME B16.14, ASTM A276, ASTM A479 | 0000000 | 00000 |
| 1 1/4 | 1000 | 1,000 psi @ 72° F | 650 psi @ 350° F | ANSI/MSS SP-114, ASME B16.14, ASTM A276, ASTM A479 | 0000000 | 00000 |
| 1 1/2 | 1000 | 1,000 psi @ 72° F | 650 psi @ 350° F | ANSI/MSS SP-114, ASME B16.14, ASTM A276, ASTM A479 | 0000000 | 00000 |
| 2 | 1000 | 1,000 psi @ 72° F | 650 psi @ 350° F | ANSI/MSS SP-114, ASME B16.14, ASTM A276, ASTM A479 | 0000000 | 00000 |
Extreme-Pressure Stainless Steel Threaded Pipe Fittings
With the strength to handle extreme pressures, these fittings can be used to connect equipment in hydraulic fluid lines. 316 stainless steel fittings have excellent corrosion resistance.
NPTF (Dryseal) threads are compatible with NPT threads. UN/UNF (SAE Straight) threads are also known as O-ring boss threads; the male threads have a gasket to prevent leaks.
For technical drawings and 3-D models, click on a part number.
- For Use With:
NPTF: Hydraulic Fluid, Oil, Steam, Water
BSPP and Metric: Hydraulic Fluid, Oil, Water - Specifications Met:
NPTF: ASTM A479
Metric: DIN 7631, ISO 9974
BSPP: ISO 1179, ISO 8434-6
316 Stainless Steel | ||||||
|---|---|---|---|---|---|---|
| Pipe Size | Dash Size | Drive Size | Max. Pressure | Max. Steam Pressure | Each | |
NPTF Male | ||||||
| 1/8 | 02 | 3/16" | 7,200 psi @ 72° F | 7,200 psi @ 300° F | 000000000 | 000000 |
| 1/4 | 04 | 1/4" | 7,200 psi @ 72° F | 7,200 psi @ 300° F | 000000000 | 00000 |
| 3/8 | 06 | 5/16" | 7,200 psi @ 72° F | 7,200 psi @ 300° F | 000000000 | 00000 |
| 1/2 | 08 | 3/8" | 7,200 psi @ 72° F | 7,200 psi @ 300° F | 000000000 | 00000 |
| 3/4 | 12 | 9/16" | 6,600 psi @ 72° F | 6,600 psi @ 300° F | 000000000 | 00000 |
| 1 | 16 | 5/8" | 5,300 psi @ 72° F | 5,300 psi @ 300° F | 000000000 | 00000 |
(SAE Straight) Male
Threads with Gasket
- For Use With:
UN/UNF (SAE Straight) Plugs: Hydraulic Fluid (Petroleum Base),Oil, Water
All Other Plugs: Hydraulic Fluid, Oil Steam, Water - Specifications Met:
NPTF and UN/UNF (SAE Straight): ASTM A479
BSPP and BSPT: ISO 1179, ISO 8434-6
316 Stainless Steel | |||||||
|---|---|---|---|---|---|---|---|
| Pipe Size | Thread Size | Dash Size | Plug Construction | Max. Pressure | Max. Steam Pressure | Each | |
NPTF Male | |||||||
| 1/8 | __ | 02 | Solid | 7,200 psi @ 72° F | 7,200 psi @ 300° F | 000000000 | 00000 |
| 1/4 | __ | 04 | Hollow | 7,200 psi @ 72° F | 7,200 psi @ 300° F | 000000000 | 0000 |
| 3/8 | __ | 06 | Hollow | 7,200 psi @ 72° F | 7,200 psi @ 300° F | 000000000 | 00000 |
| 1/2 | __ | 08 | Hollow | 7,200 psi @ 72° F | 7,200 psi @ 300° F | 000000000 | 00000 |
| 3/4 | __ | 12 | Hollow | 6,600 psi @ 72° F | 6,600 psi @ 300° F | 000000000 | 00000 |
| 1 | __ | 16 | Hollow | 5,400 psi @ 72° F | 5,400 psi @ 300° F | 000000000 | 00000 |
UN/UNF (SAE Straight) Male | |||||||
| __ | 3/8"-24 | 03 | Hollow | 9,000 psi @ 72° F | __ | 000000000 | 00000 |
| __ | 7/16"-20 | 04 | Hollow | 9,000 psi @ 72° F | __ | 000000000 | 0000 |
| __ | 1/2"-20 | 05 | Hollow | 7,200 psi @ 72° F | __ | 000000000 | 00000 |
| __ | 9/16"-18 | 06 | Hollow | 7,200 psi @ 72° F | __ | 000000000 | 00000 |
| __ | 3/4"-16 | 08 | Hollow | 7,200 psi @ 72° F | __ | 000000000 | 00000 |
| __ | 7/8"-14 | 10 | Hollow | 7,200 psi @ 72° F | __ | 000000000 | 00000 |
| __ | 1 1/16"-12 | 12 | Hollow | 7,200 psi @ 72° F | __ | 000000000 | 00000 |
| __ | 1 5/16"-12 | 16 | Hollow | 6,600 psi @ 72° F | __ | 000000000 | 00000 |
Precision Extreme-Pressure Stainless Steel Threaded Pipe Fittings
Made to tighter tolerances than other stainless steel pipe fittings, these are also known as instrumentation fittings. The male threads are rolled for extra strength in extreme-pressure applications. Fittings are commonly used to connect equipment in gas and hydraulic fluid lines. They are 316 stainless steel for excellent corrosion resistance.
For technical drawings and 3-D models, click on a part number.
- For Use With: Hydraulic Fluid, Liquid Nitrogen, Natural Gas, Steam, Water
- Specifications Met:
1/2 Pipe Size: ASME B1.20.1, ASME B31.1, ASME B31.3, ASTM A182, ASTM A276, ASTM A479
All other sizes: ASME B1.20.1, ASME B31.1, ASME B31.3
316 Stainless Steel | ||||||
|---|---|---|---|---|---|---|
| Pipe Size | Dash Size | Drive Size | Max. Pressure | Max. Steam Pressure | Each | |
NPT Male | ||||||
| 1/2 | 08 | 3/8" | 7,700 psi @ 72° F | 7,700 psi @ 300° F | 000000000 | 000000 |