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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. 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.
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.
Straight Connectors, Female
Straight Connector
- 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 | ||||||
| 1/4 | 1000 | 1,000 psi @ 72° F | 650 psi @ 350° F | ANSI/MSS SP-114, ASTM A276, ASTM A479 | 0000000 | 000000 |
| 3/8 | 1000 | 1,000 psi @ 72° F | 650 psi @ 350° F | ANSI/MSS SP-114, ASTM A276, ASTM A479 | 0000000 | 00000 |
| 1/2 | 1000 | 1,000 psi @ 72° F | 650 psi @ 350° F | ANSI/MSS SP-114, ASTM A276, ASTM A479 | 0000000 | 00000 |
| 3/4 | 1000 | 1,000 psi @ 72° F | 650 psi @ 350° F | ANSI/MSS SP-114, ASTM A276, ASTM A479 | 0000000 | 00000 |
| 1 | 1000 | 1,000 psi @ 72° F | 650 psi @ 350° F | ANSI/MSS SP-114, ASTM A276, ASTM A479 | 0000000 | 00000 |
316 Stainless Steel | ||||||
NPT Female | ||||||
| 1/4 | 1000 | 1,000 psi @ 72° F | 650 psi @ 350° F | ANSI/MSS SP-114, ASTM A276, ASTM A479 | 0000000 | 00000 |
| 3/8 | 1000 | 1,000 psi @ 72° F | 650 psi @ 350° F | ANSI/MSS SP-114, ASTM A276, ASTM A479 | 0000000 | 00000 |
| 1/2 | 1000 | 1,000 psi @ 72° F | 650 psi @ 350° F | ANSI/MSS SP-114, ASTM A276, ASTM A479 | 0000000 | 00000 |
| 3/4 | 1000 | 1,000 psi @ 72° F | 650 psi @ 350° F | ANSI/MSS SP-114, ASTM A276, ASTM A479 | 0000000 | 00000 |
| 1 | 1000 | 1,000 psi @ 72° F | 650 psi @ 350° F | ANSI/MSS SP-114, ASTM A276, ASTM A479 | 0000000 | 00000 |
Straight Adapters, Threaded Female × Butt Weld
Straight Adapter
- 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 | ||||||
| 1/4 | 1000 | 1,000 psi @ 72° F | 650 psi @ 350° F | ANSI/MSS SP-114, ASTM A276, ASTM A479 | 0000000 | 00000 |
| 3/8 | 1000 | 1,000 psi @ 72° F | 650 psi @ 350° F | ANSI/MSS SP-114, ASTM A276, ASTM A479 | 0000000 | 0000 |
| 1/2 | 1000 | 1,000 psi @ 72° F | 650 psi @ 350° F | ANSI/MSS SP-114, ASTM A276, ASTM A479 | 0000000 | 00000 |
| 3/4 | 1000 | 1,000 psi @ 72° F | 650 psi @ 350° F | ANSI/MSS SP-114, ASTM A276, ASTM A479 | 0000000 | 00000 |
| 1 | 1000 | 1,000 psi @ 72° F | 650 psi @ 350° F | ANSI/MSS SP-114, ASTM A276, ASTM A479 | 0000000 | 00000 |
316 Stainless Steel | ||||||
NPT Female × Butt Weld | ||||||
| 1/4 | 1000 | 1,000 psi @ 72° F | 650 psi @ 350° F | ANSI/MSS SP-114, ASTM A276, ASTM A479 | 0000000 | 00000 |
| 3/8 | 1000 | 1,000 psi @ 72° F | 650 psi @ 350° F | ANSI/MSS SP-114, ASTM A276, ASTM A479 | 0000000 | 00000 |
| 1/2 | 1000 | 1,000 psi @ 72° F | 650 psi @ 350° F | ANSI/MSS SP-114, ASTM A276, ASTM A479 | 0000000 | 00000 |
| 3/4 | 1000 | 1,000 psi @ 72° F | 650 psi @ 350° F | ANSI/MSS SP-114, ASTM A276, ASTM A479 | 0000000 | 00000 |
| 1 | 1000 | 1,000 psi @ 72° F | 650 psi @ 350° F | ANSI/MSS SP-114, ASTM A276, ASTM A479 | 0000000 | 00000 |
Bushing Straight Reducing Adapters
- For Use With: Air, Natural Gas, Oil, Steam, Water
- Pressure Class: 1000
- Fabrication: Heat Treated
- Specifications Met: ANSI/MSS SP-114, ASTM A276, ASTM A479
- Certification: Material Certificate with Traceable Lot Number
- Pipe Nipples and Pipe: Use Schedule 40 stainless steel
- Flanges: Use Class 150 stainless steel
Pipe Size | 316 Stainless Steel | ||||
|---|---|---|---|---|---|
| (A) | (B) | Max. Pressure | Max. Steam Pressure | Each | |
NPT Male × NPT Female | |||||
| 1/4 | 1/8 | 1,000 psi @ 72° F | 650 psi @ 350° F | 0000000 | 00000 |
| 3/8 | 1/4 | 1,000 psi @ 72° F | 650 psi @ 350° F | 0000000 | 0000 |
| 1/2 | 1/4 | 1,000 psi @ 72° F | 650 psi @ 350° F | 0000000 | 00000 |
| 1/2 | 3/8 | 1,000 psi @ 72° F | 650 psi @ 350° F | 0000000 | 00000 |
| 3/4 | 1/4 | 1,000 psi @ 72° F | 650 psi @ 350° F | 0000000 | 00000 |
| 3/4 | 3/8 | 1,000 psi @ 72° F | 650 psi @ 350° F | 0000000 | 00000 |
| 3/4 | 1/2 | 1,000 psi @ 72° F | 650 psi @ 350° F | 0000000 | 00000 |
| 1 | 1/4 | 1,000 psi @ 72° F | 650 psi @ 350° F | 0000000 | 00000 |
| 1 | 1/2 | 1,000 psi @ 72° F | 650 psi @ 350° F | 0000000 | 00000 |
| 1 | 3/4 | 1,000 psi @ 72° F | 650 psi @ 350° F | 0000000 | 00000 |
| 1 1/4 | 1 | 1,000 psi @ 72° F | 650 psi @ 350° F | 0000000 | 00000 |
| 1 1/2 | 3/4 | 1,000 psi @ 72° F | 650 psi @ 350° F | 0000000 | 00000 |
| 1 1/2 | 1 | 1,000 psi @ 72° F | 650 psi @ 350° F | 0000000 | 00000 |
| 2 | 1 | 1,000 psi @ 72° F | 650 psi @ 350° F | 0000000 | 00000 |
| 2 | 1 1/2 | 1,000 psi @ 72° F | 650 psi @ 350° F | 0000000 | 00000 |
Plugs with Hex Drive
Plug with Hex Drive
- 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 | 5/8" | 270 psi @ 72° F | 150 psi @ 350° F | ASME B16.14, ASTM A276, ASTM A479 | 0000000 | 000000 |
| 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 |
Plugs with External Hex Drive
Plug with External Hex Drive
- 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 | |||||||
| 1/2 | 7/8" | 1000 | 1,000 psi @ 72° F | 650 psi @ 350° F | ANSI/MSS SP-114, ASTM A276, ASTM A479 | 0000000 | 000000 |
| 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 |
Plugs with External Square Drive
Plug with External Square Drive
- 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 | 1000 | 1,000 psi @ 72° F | 650 psi @ 350° F | ANSI/MSS SP-114, ASME B16.14, ASTM A276, ASTM A479 | 0000000 | 000000 |
| 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 |
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.
Union connectors separate into three pieces so you can access your line without unthreading pipe connections.
BSPP male threads have a gasket and washer to prevent leaks. 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.
Straight Connectors, Male
- For Use With: Hydraulic Fluid, Liquid Nitrogen, Natural Gas, Steam, Water
- Specifications Met:
3/4 Pipe Size: ASME B1.20.1, ASME B31.3, ASTM A276, ASTM A479
All other sizes: ASME B1.20.1, ASME B31.1, ASME B31.3
316 Stainless Steel | |||||
|---|---|---|---|---|---|
| Pipe Size | Dash Size | Max. Pressure | Max. Steam Pressure | Each | |
NPT Male | |||||
| 3/4 | 12 | 7,300 psi @ 72° F | 7,300 psi @ 300° F | 00000000 | 000000 |
Union Straight Connectors
Assembled View
Exploded View
- For Use With: Hydraulic Fluid, Liquid Nitrogen, Natural Gas, Steam, Water
- Specifications Met: ASME B1.20.1, ASME B31.1, ASME B31.3, ASTM A182, ASTM 276, ASTM A479
Straight Adapters, Female × Male
BSPP Male
Threads with
Gasket and Washer
Threads with
Gasket and Washer
- For Use With:
NPT × BSPP: Natural Gas, Water
All others: Hydraulic Fluid, Liquid Nitrogen, Natural Gas, Steam, Water - Specifications Met:
NPT × NPT: ASME B1.20.1, ASME B31.1, ASME B31.3
NPT × BSPP: ASME B1.20.1, ASME B31.1, ASME B31.3, ASTM A276, ASTM A479, ISO 228.1, ISO 228.2, ISO BS 2779
BSPP × NPT: ASME B1.20.1, ASME B31.1, ASME B31.3, ISO 228.1, ISO 228.2, ISO BS 2779
NPT × BSPT: ASME B1.20.1, ASME B31.1, ASME B31.3, ISO 7.1, ISO BS2.1
BSPT × NPT: ASME B1.20.1, ASME B31.1, ASME B31.3, ISO 7.1, ISO BS2.1
Straight Adapters, Male
Straight Adapter, Male Threaded Pipe
BSPP Male
Threads with
Gasket and Washer
Threads with
Gasket and Washer
UN/UNF
(SAE Straight) Male
Threads with Gasket
(SAE Straight) Male
Threads with Gasket
- For Use With:
NPT × BSPP: Natural Gas, Water
NPT × BSPT and UN/UNF (SAE Straight) Male × NPT Male: Hydraulic Fluid, Liquid Nitrogen, Natural Gas, Steam, Water - Specifications Met:
NPT × BSPP: ASME B1.20.1, ASME B31.1, ASME B31.3, ASTM A276, ASTM A479, ISO 228.1, ISO 228.2, ISO BS 2779
NPT × BSPT: ASME B1.20.1, ASME B31.1, ASME B31.3, ISO 7.1, ISO BS2.1
UN/UNF (SAE Straight) Male × NPT Male: ASME B1.20.1, ASME B31.1, ASME B31.3, ASTM A182, ASTM A276, ASTM A479, SAE J1926
| Pipe Size (A) | Thread Size (A) | Dash Size (A) | Pipe Size (B) | Dash Size (B) | Max. Pressure | Max. Steam Pressure | Each | |
NPT Male × BSPP Male | ||||||||
|---|---|---|---|---|---|---|---|---|
| 1/8 | __ | __ | 1/8 | __ | 5,300 psi @ 72° F | __ | 00000000 | 000000 |
| 1/4 | __ | __ | 1/4 | __ | 5,500 psi @ 72° F | __ | 00000000 | 00000 |
| 3/8 | __ | __ | 3/8 | __ | 4,400 psi @ 72° F | __ | 00000000 | 00000 |
| 1/2 | __ | __ | 1/2 | __ | 4,000 psi @ 72° F | __ | 00000000 | 00000 |
| 3/4 | __ | __ | 3/4 | __ | 3,700 psi @ 72° F | __ | 00000000 | 00000 |
| 1 | __ | __ | 1 | __ | 2,800 psi @ 72° F | __ | 00000000 | 000000 |
UN/UNF (SAE Straight) Male × NPT Male | ||||||||
| __ | 3/4"-16 | 08 | 1/2 | 08 | 4,500 psi @ 72° F | 4,500 psi @ 300° F | 000000000 | 00000 |
| __ | 1 1/16"-12 | 12 | 3/4 | 12 | 3,600 psi @ 72° F | 3,600 psi @ 300° F | 000000000 | 00000 |
| __ | 1 5/16"-12 | 18 | 1 | 18 | 2,900 psi @ 72° F | 2,900 psi @ 300° F | 000000000 | 00000 |
Bushing Straight Reducing Adapters
- For Use With: Hydraulic Fluid, Liquid Nitrogen, Natural Gas, Steam, Water
- Specifications Met: See table
Pipe Size | Dash Size | 316 Stainless Steel | ||||||
|---|---|---|---|---|---|---|---|---|
| (A) | (B) | (A) | (B) | Max. Pressure | Max. Steam Pressure | Specifications Met | Each | |
NPT Male × NPT Female | ||||||||
| 1 1/2 | 1/2 | 24 | 08 | 4,900 psi @ 72° F | 4,900 psi @ 300° F | ASME B1.20.1, ASME B31.1, ASME B31.3, ASTM A182, ASTM A276, ASTM A479 | 000000000 | 0000000 |
| 2 | 1/2 | 32 | 08 | 4,900 psi @ 72° F | 4,900 psi @ 300° F | ASME B1.20.1, ASME B31.1, ASME B31.3, ASTM A182, ASTM A276, ASTM A479 | 000000000 | 000000 |
| 2 | 3/4 | 32 | 12 | 4,600 psi @ 72° F | 4,600 psi @ 300° F | ASME B1.20.1, ASME B31.1, ASME B31.3, ASTM A182, ASTM A276, ASTM A479 | 000000000 | 000000 |
90° Elbow Reducing Adapters
- For Use With: Hydraulic Fluid, Liquid Nitrogen, Natural Gas, Steam, Water
- Specifications Met: See table
Pipe Size | Dash Size | 316 Stainless Steel | ||||||
|---|---|---|---|---|---|---|---|---|
| (A) | (B) | (A) | (B) | Max. Pressure | Max. Steam Pressure | Specifications Met | Each | |
NPT Female × NPT Male | ||||||||
| 1/4 | 1/8 | 04 | 02 | 6,600 psi @ 72° F | 6,600 psi @ 300° F | ASME B1.20.1, ASME B31.1, ASME B31.3, ASTM A182, ASTM A276, ASTM A479 | 000000000 | 000000 |
| 3/8 | 1/4 | 06 | 04 | 5,300 psi @ 72° F | 5,300 psi @ 300° F | ASME B1.20.1, ASME B31.1, ASME B31.3, ASTM A182, ASTM A276, ASTM A479 | 000000000 | 00000 |
| 1/2 | 1/4 | 08 | 04 | 4,900 psi @ 72° F | 4,900 psi @ 300° F | ASME B1.20.1, ASME B31.1, ASME B31.3, ASTM A182, ASTM A276, ASTM A479 | 000000000 | 00000 |
| 1/2 | 3/8 | 08 | 06 | 4,900 psi @ 72° F | 4,900 psi @ 300° F | ASME B1.20.1, ASME B31.1, ASME B31.3, ASTM A182, ASTM A276, ASTM A479 | 000000000 | 00000 |
Plugs with Hex Drive
- 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 |