How to Identify and Measure Fittings
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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.
Female x male 90° elbow adapters are also known as street elbows. Inline tees are also known as branch tees. Right-angle tees are also known as run tees. 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: Hydraulic Fluid, Liquid Nitrogen, Natural Gas, Steam, Water
- Specifications Met: ASME B1.20.1, ASME B31.1, ASME B31.3
316 Stainless Steel | |||||
---|---|---|---|---|---|
Pipe Size | Dash Size | Max. Pressure | Max. Steam Pressure | Each | |
NPT Female | |||||
1/16 | __ | 7,500 psi @ 72° F | 7,500 psi @ 300° F | 000000000 | 000000 |
1/8 | 02 | 6,400 psi @ 72° F | 6,400 psi @ 300° F | 00000000 | 00000 |
1/4 | 04 | 6,600 psi @ 72° F | 6,600 psi @ 300° F | 00000000 | 00000 |
3/8 | 06 | 5,300 psi @ 72° F | 5,300 psi @ 300° F | 00000000 | 00000 |
1/2 | 08 | 5,200 psi @ 72° F | 5,200 psi @ 300° F | 00000000 | 00000 |
3/4 | 12 | 4,600 psi @ 72° F | 4,600 psi @ 300° F | 000000000 | 00000 |
1 | 16 | 4,400 psi @ 72° F | 4,400 psi @ 300° F | 000000000 | 00000 |

- 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 | |||||
1/16 | __ | 10,000 psi @ 72° F | 10,000 psi @ 300° F | 000000000 | 000000 |
1/8 | 02 | 9,100 psi @ 72° F | 9,100 psi @ 300° F | 00000000 | 0000 |
1/4 | 04 | 7,500 psi @ 72° F | 7,500 psi @ 300° F | 00000000 | 00000 |
3/8 | 06 | 7,200 psi @ 72° F | 7,200 psi @ 300° F | 000000000 | 00000 |
1/2 | 08 | 6,600 psi @ 72° F | 6,600 psi @ 300° F | 000000000 | 00000 |
3/4 | 12 | 7,300 psi @ 72° F | 7,300 psi @ 300° F | 00000000 | 00000 |
1 | 16 | 4,600 psi @ 72° F | 4,600 psi @ 300° F | 000000000 | 00000 |

- For Use With: Hydraulic Fluid, Liquid Nitrogen, Natural Gas, Steam, Water
- Specifications Met: ASME B1.20.1, ASME B31.1, ASME B31.3
316 Stainless Steel | ||||||
---|---|---|---|---|---|---|
Pipe Size | Dash Size | Lg. | Max. Pressure | Max. Steam Pressure | Each | |
NPT Male | ||||||
1/16 | __ | 1 1/16" | 10,000 psi @ 72° F | 10,000 psi @ 300° F | 000000000 | 000000 |
1/16 | __ | 2" | 10,000 psi @ 72° F | 10,000 psi @ 300° F | 000000000 | 00000 |
1/16 | __ | 2 1/2" | 10,000 psi @ 72° F | 10,000 psi @ 300° F | 000000000 | 00000 |
1/16 | __ | 4" | 10,000 psi @ 72° F | 10,000 psi @ 300° F | 000000000 | 00000 |
1/8 | 02 | 1 1/16" | 9,100 psi @ 72° F | 9,100 psi @ 300° F | 00000000 | 0000 |
1/8 | 02 | 2" | 9,100 psi @ 72° F | 9,100 psi @ 300° F | 000000000 | 00000 |
1/8 | 02 | 2 1/2" | 9,100 psi @ 72° F | 9,100 psi @ 300° F | 000000000 | 00000 |
1/8 | 02 | 3" | 9,100 psi @ 72° F | 9,100 psi @ 300° F | 000000000 | 00000 |
1/8 | 02 | 4" | 9,100 psi @ 72° F | 9,100 psi @ 300° F | 000000000 | 00000 |
1/4 | 04 | 1 7/16" | 7,500 psi @ 72° F | 7,500 psi @ 300° F | 00000000 | 00000 |
1/4 | 04 | 2" | 7,500 psi @ 72° F | 7,500 psi @ 300° F | 00000000 | 00000 |
1/4 | 04 | 2 1/2" | 7,500 psi @ 72° F | 7,500 psi @ 300° F | 00000000 | 00000 |
1/4 | 04 | 3" | 7,500 psi @ 72° F | 7,500 psi @ 300° F | 00000000 | 00000 |
1/4 | 04 | 4" | 7,500 psi @ 72° F | 7,500 psi @ 300° F | 00000000 | 00000 |
3/8 | 06 | 1 7/16" | 7,200 psi @ 72° F | 7,200 psi @ 300° F | 000000000 | 00000 |
3/8 | 06 | 2" | 7,200 psi @ 72° F | 7,200 psi @ 300° F | 000000000 | 00000 |
3/8 | 06 | 2 1/2" | 7,200 psi @ 72° F | 7,200 psi @ 300° F | 000000000 | 00000 |
3/8 | 06 | 3" | 7,200 psi @ 72° F | 7,200 psi @ 300° F | 000000000 | 00000 |
3/8 | 06 | 4" | 7,200 psi @ 72° F | 7,200 psi @ 300° F | 000000000 | 00000 |
1/2 | 08 | 1 7/8" | 6,600 psi @ 72° F | 6,600 psi @ 300° F | 000000000 | 00000 |
1/2 | 08 | 2" | 6,600 psi @ 72° F | 6,600 psi @ 300° F | 000000000 | 00000 |
1/2 | 08 | 2 1/2" | 6,600 psi @ 72° F | 6,600 psi @ 300° F | 000000000 | 00000 |
1/2 | 08 | 3" | 6,600 psi @ 72° F | 6,600 psi @ 300° F | 000000000 | 00000 |
1/2 | 08 | 4" | 6,600 psi @ 72° F | 6,600 psi @ 300° F | 000000000 | 00000 |
3/4 | 12 | 1 27/32" | 7,300 psi @ 72° F | 7,300 psi @ 300° F | 000000000 | 00000 |
3/4 | 12 | 2" | 7,300 psi @ 72° F | 7,300 psi @ 300° F | 000000000 | 00000 |
3/4 | 12 | 3" | 7,300 psi @ 72° F | 7,300 psi @ 300° F | 000000000 | 00000 |
3/4 | 12 | 4" | 7,300 psi @ 72° F | 7,300 psi @ 300° F | 000000000 | 00000 |
1 | 16 | 2 5/16" | 5,300 psi @ 72° F | 5,300 psi @ 300° F | 000000000 | 00000 |
1 | 16 | 3" | 5,300 psi @ 72° F | 5,300 psi @ 300° F | 000000000 | 00000 |
1 | 16 | 4" | 5,300 psi @ 72° F | 5,300 psi @ 300° F | 000000000 | 00000 |


- 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

- 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
Pipe Size | Dash Size | Max. Pressure | Max. Steam Pressure | Each | |
NPT Female × NPT Male | |||||
---|---|---|---|---|---|
1/8 | 02 | 6,400 psi @ 72° F | 6,400 psi @ 300° F | 000000000 | 000000 |
1/4 | 04 | 6,600 psi @ 72° F | 6,600 psi @ 300° F | 00000000 | 00000 |
3/8 | 06 | 5,300 psi @ 72° F | 5,300 psi @ 300° F | 00000000 | 00000 |
1/2 | 08 | 5,200 psi @ 72° F | 5,200 psi @ 300° F | 00000000 | 00000 |
3/4 | 12 | 4,600 psi @ 72° F | 4,600 psi @ 300° F | 000000000 | 00000 |
1 | 16 | 4,400 psi @ 72° F | 4,400 psi @ 300° F | 000000000 | 00000 |
NPT Female × BSPT Male | |||||
1/8 | 02 | 6,100 psi @ 72° F | 6,100 psi @ 300° F | 0000000 | 00000 |
1/4 | 04 | 6,200 psi @ 72° F | 6,200 psi @ 300° F | 0000000 | 00000 |
3/8 | 06 | 5,000 psi @ 72° F | 5,000 psi @ 300° F | 0000000 | 00000 |
1/2 | 08 | 4,600 psi @ 72° F | 4,600 psi @ 300° F | 0000000 | 00000 |
3/4 | 12 | 4,300 psi @ 72° F | 4,300 psi @ 300° F | 0000000 | 00000 |
1 | 16 | 4,100 psi @ 72° F | 4,100 psi @ 300° F | 0000000 | 000000 |
BSPP Female × NPT Male | |||||
1/8 | 02 | 6,100 psi @ 72° F | 6,100 psi @ 300° F | 0000000 | 00000 |
1/4 | 04 | 6,200 psi @ 72° F | 6,200 psi @ 300° F | 0000000 | 00000 |
3/8 | 06 | 5,000 psi @ 72° F | 5,000 psi @ 300° F | 0000000 | 00000 |
1/2 | 08 | 4,600 psi @ 72° F | 4,600 psi @ 300° F | 0000000 | 00000 |
3/4 | 12 | 4,300 psi @ 72° F | 4,300 psi @ 300° F | 0000000 | 00000 |
1 | 16 | 4,100 psi @ 72° F | 4,100 psi @ 300° F | 0000000 | 000000 |
BSPT Female × NPT Male | |||||
1/8 | 02 | 6,100 psi @ 72° F | 6,100 psi @ 300° F | 0000000 | 00000 |
1/4 | 04 | 6,200 psi @ 72° F | 6,200 psi @ 300° F | 0000000 | 00000 |
3/8 | 06 | 5,000 psi @ 72° F | 5,000 psi @ 300° F | 0000000 | 00000 |
1/2 | 08 | 4,600 psi @ 72° F | 4,600 psi @ 300° F | 0000000 | 00000 |
3/4 | 12 | 4,300 psi @ 72° F | 4,300 psi @ 300° F | 0000000 | 00000 |
1 | 16 | 4,100 psi @ 72° F | 4,100 psi @ 300° F | 0000000 | 000000 |


(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 × BSPT Male | ||||||||
---|---|---|---|---|---|---|---|---|
1/8 | __ | 02 | 1/8 | 02 | 9,100 psi @ 72° F | 9,100 psi @ 300° F | 0000000 | 000000 |
1/4 | __ | 04 | 1/4 | 04 | 7,500 psi @ 72° F | 7,500 psi @ 300° F | 0000000 | 00000 |
3/8 | __ | 06 | 3/8 | 06 | 7,200 psi @ 72° F | 7,200 psi @ 300° F | 0000000 | 00000 |
1/2 | __ | 08 | 1/2 | 08 | 6,600 psi @ 72° F | 6,600 psi @ 300° F | 0000000 | 00000 |
3/4 | __ | 12 | 3/4 | 12 | 6,400 psi @ 72° F | 6,400 psi @ 300° F | 0000000 | 00000 |
1 | __ | 16 | 1 | 16 | 4,600 psi @ 72° F | 4,600 psi @ 300° F | 0000000 | 00000 |
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 |

- For Use With: Hydraulic Fluid, Liquid Nitrogen, Natural Gas, Steam, Water
- Specifications Met: ASME B1.20.1, ASME B31.1, ASME B31.3
Pipe Size | Dash Size | 316 Stainless Steel | |||||
---|---|---|---|---|---|---|---|
(A) | (B) | (A) | (B) | Max. Pressure | Max. Steam Pressure | Each | |
NPT Female × NPT Male | |||||||
1/8 | 1/16 | 02 | __ | 6,400 psi @ 72° F | 6,400 psi @ 300° F | 000000000 | 000000 |
1/4 | 1/8 | 04 | 02 | 6,600 psi @ 72° F | 6,600 psi @ 300° F | 000000000 | 00000 |
3/8 | 1/8 | 06 | 02 | 5,300 psi @ 72° F | 5,300 psi @ 300° F | 000000000 | 00000 |
3/8 | 1/4 | 06 | 04 | 5,300 psi @ 72° F | 5,300 psi @ 300° F | 00000000 | 00000 |
1/2 | 1/8 | 08 | 02 | 5,200 psi @ 72° F | 5,200 psi @ 300° F | 000000000 | 00000 |
1/2 | 1/4 | 08 | 04 | 5,200 psi @ 72° F | 5,200 psi @ 300° F | 00000000 | 00000 |
1/2 | 3/8 | 08 | 06 | 5,200 psi @ 72° F | 5,200 psi @ 300° F | 00000000 | 00000 |
3/4 | 1/4 | 12 | 04 | 4,600 psi @ 72° F | 4,600 psi @ 300° F | 000000000 | 00000 |
3/4 | 3/8 | 12 | 06 | 4,600 psi @ 72° F | 4,600 psi @ 300° F | 000000000 | 00000 |
3/4 | 1/2 | 12 | 08 | 4,600 psi @ 72° F | 4,600 psi @ 300° F | 000000000 | 00000 |
1 | 1/4 | 16 | 04 | 4,400 psi @ 72° F | 4,400 psi @ 300° F | 000000000 | 00000 |
1 | 1/2 | 16 | 08 | 4,400 psi @ 72° F | 4,400 psi @ 300° F | 000000000 | 00000 |
1 | 3/4 | 16 | 12 | 4,400 psi @ 72° F | 4,400 psi @ 300° F | 000000000 | 00000 |

- 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 | ||||||||
1/8 | 1/16 | 02 | __ | 6,400 psi @ 72° F | 6,400 psi @ 300° F | ASME B1.20.1, ASME B31.1, ASME B31.3 | 000000000 | 00000 |
1/4 | 1/16 | 04 | __ | 7,500 psi @ 72° F | 7,500 psi @ 300° F | ASME B1.20.1, ASME B31.1, ASME B31.3 | 000000000 | 00000 |
1/4 | 1/8 | 04 | 02 | 6,000 psi @ 72° F | 6,000 psi @ 300° F | ASME B1.20.1, ASME B31.1, ASME B31.3 | 000000000 | 00000 |
3/8 | 1/8 | 06 | 02 | 6,400 psi @ 72° F | 6,400 psi @ 300° F | ASME B1.20.1, ASME B31.1, ASME B31.3 | 000000000 | 00000 |
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 | 000000000 | 00000 |
1/2 | 1/8 | 08 | 02 | 6,600 psi @ 72° F | 6,600 psi @ 300° F | ASME B1.20.1, ASME B31.1, ASME B31.3 | 000000000 | 00000 |
1/2 | 1/4 | 08 | 04 | 6,400 psi @ 72° F | 6,400 psi @ 300° F | ASME B1.20.1, ASME B31.1, ASME B31.3 | 000000000 | 00000 |
1/2 | 3/8 | 08 | 06 | 4,600 psi @ 72° F | 4,600 psi @ 300° F | ASME B1.20.1, ASME B31.1, ASME B31.3 | 000000000 | 00000 |
3/4 | 1/4 | 12 | 04 | 6,400 psi @ 72° F | 6,400 psi @ 300° F | ASME B1.20.1, ASME B31.1, ASME B31.3 | 000000000 | 00000 |
3/4 | 3/8 | 12 | 06 | 5,300 psi @ 72° F | 5,300 psi @ 300° F | ASME B1.20.1, ASME B31.1, ASME B31.3 | 000000000 | 00000 |
3/4 | 1/2 | 12 | 08 | 4,900 psi @ 72° F | 4,900 psi @ 300° F | ASME B1.20.1, ASME B31.1, ASME B31.3 | 000000000 | 00000 |
1 | 1/4 | 16 | 04 | 5,300 psi @ 72° F | 5,300 psi @ 300° F | ASME B1.20.1, ASME B31.1, ASME B31.3 | 000000000 | 00000 |
1 | 3/8 | 16 | 06 | 5,300 psi @ 72° F | 5,300 psi @ 300° F | ASME B1.20.1, ASME B31.1, ASME B31.3 | 000000000 | 00000 |
1 | 1/2 | 16 | 08 | 4,900 psi @ 72° F | 4,900 psi @ 300° F | ASME B1.20.1, ASME B31.1, ASME B31.3 | 000000000 | 00000 |
1 | 3/4 | 16 | 12 | 4,600 psi @ 72° F | 4,600 psi @ 300° F | ASME B1.20.1, ASME B31.1, ASME B31.3 | 000000000 | 00000 |
1 1/4 | 1 | 20 | 16 | 4,400 psi @ 72° F | 4,400 psi @ 300° F | ASME B1.20.1, ASME B31.1, ASME B31.3 | 000000000 | 00000 |
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 | 000000 |
1 1/2 | 1 | 24 | 16 | 4,400 psi @ 72° F | 4,400 psi @ 300° F | ASME B1.20.1, ASME B31.1, ASME B31.3 | 000000000 | 00000 |
1 1/2 | 1 1/4 | 24 | 20 | 5,000 psi @ 72° F | 5,000 psi @ 300° F | ASME B1.20.1, ASME B31.1, ASME B31.3 | 000000000 | 000000 |
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 |
2 | 1 | 32 | 16 | 3,900 psi @ 72° F | 3,900 psi @ 300° F | ASME B1.20.1, ASME B31.1, ASME B31.3 | 000000000 | 000000 |
2 | 1 1/2 | 32 | 24 | 3,900 psi @ 72° F | 3,900 psi @ 300° F | ASME B1.20.1, ASME B31.1, ASME B31.3 | 000000000 | 000000 |

- For Use With: Hydraulic Fluid, Liquid Nitrogen, Natural Gas, Steam, Water
- Specifications Met: ASME B1.20.1, ASME B31.1, ASME B31.3
Pipe Size | Dash Size | 316 Stainless Steel | |||||
---|---|---|---|---|---|---|---|
(A) | (B) | (A) | (B) | Max. Pressure | Max. Steam Pressure | Each | |
NPT Female | |||||||
1/8 | 1/16 | 02 | __ | 6,400 psi @ 72° F | 6,400 psi @ 300° F | 000000000 | 000000 |
1/4 | 1/8 | 04 | 02 | 6,600 psi @ 72° F | 6,600 psi @ 300° F | 000000000 | 00000 |
3/8 | 1/8 | 06 | 02 | 5,300 psi @ 72° F | 5,300 psi @ 300° F | 000000000 | 00000 |
3/8 | 1/4 | 06 | 04 | 5,300 psi @ 72° F | 5,300 psi @ 300° F | 00000000 | 00000 |
1/2 | 1/8 | 08 | 02 | 5,200 psi @ 72° F | 5,200 psi @ 300° F | 000000000 | 00000 |
1/2 | 1/4 | 08 | 04 | 5,200 psi @ 72° F | 5,200 psi @ 300° F | 00000000 | 00000 |
1/2 | 3/8 | 08 | 06 | 5,200 psi @ 72° F | 5,200 psi @ 300° F | 00000000 | 00000 |
3/4 | 1/4 | 12 | 04 | 4,600 psi @ 72° F | 4,600 psi @ 300° F | 000000000 | 00000 |
3/4 | 1/2 | 12 | 08 | 4,600 psi @ 72° F | 4,600 psi @ 300° F | 000000000 | 00000 |
1 | 1/2 | 16 | 08 | 4,400 psi @ 72° F | 4,400 psi @ 300° F | 000000000 | 00000 |
1 | 3/4 | 16 | 12 | 4,400 psi @ 72° F | 4,400 psi @ 300° F | 000000000 | 00000 |

- For Use With: Hydraulic Fluid, Liquid Nitrogen, Natural Gas, Steam, Water
- Specifications Met: ASME B1.20.1, ASME B31.1, ASME B31.3
Pipe Size | Dash Size | 316 Stainless Steel | |||||
---|---|---|---|---|---|---|---|
(A) | (B) | (A) | (B) | Max. Pressure | Max. Steam Pressure | Each | |
NPT Male | |||||||
1/8 | 1/16 | 02 | __ | 9,100 psi @ 72° F | 9,100 psi @ 300° F | 000000000 | 000000 |
1/4 | 1/8 | 04 | 02 | 7,500 psi @ 72° F | 7,500 psi @ 300° F | 00000000 | 00000 |
3/8 | 1/8 | 06 | 02 | 7,200 psi @ 72° F | 7,200 psi @ 300° F | 00000000 | 00000 |
3/8 | 1/4 | 06 | 04 | 7,200 psi @ 72° F | 7,200 psi @ 300° F | 000000000 | 00000 |
1/2 | 1/8 | 08 | 02 | 6,600 psi @ 72° F | 6,600 psi @ 300° F | 00000000 | 00000 |
1/2 | 1/4 | 08 | 04 | 6,600 psi @ 72° F | 6,600 psi @ 300° F | 000000000 | 00000 |
1/2 | 3/8 | 08 | 06 | 6,600 psi @ 72° F | 6,600 psi @ 300° F | 000000000 | 00000 |
3/4 | 1/4 | 12 | 04 | 7,300 psi @ 72° F | 7,300 psi @ 300° F | 000000000 | 00000 |
3/4 | 1/2 | 12 | 08 | 7,300 psi @ 72° F | 7,300 psi @ 300° F | 000000000 | 00000 |
1 | 1/2 | 16 | 08 | 5,300 psi @ 72° F | 5,300 psi @ 300° F | 000000000 | 00000 |
1 | 3/4 | 16 | 12 | 5,300 psi @ 72° F | 5,300 psi @ 300° F | 000000000 | 00000 |

- For Use With: Hydraulic Fluid, Liquid Nitrogen, Natural Gas, Steam, Water
- Specifications Met: ASME B1.20.1, ASME B31.1, ASME B31.3
316 Stainless Steel | |||||
---|---|---|---|---|---|
Pipe Size | Dash Size | Max. Pressure | Max. Steam Pressure | Each | |
NPT Female | |||||
1/16 | __ | 7,000 psi @ 72° F | 7,000 psi @ 300° F | 000000000 | 000000 |
1/8 | 02 | 5,500 psi @ 72° F | 5,500 psi @ 300° F | 00000000 | 00000 |
1/4 | 04 | 5,600 psi @ 72° F | 5,600 psi @ 300° F | 000000000 | 00000 |
3/8 | 06 | 5,000 psi @ 72° F | 5,000 psi @ 300° F | 00000000 | 00000 |
1/2 | 08 | 4,500 psi @ 72° F | 4,500 psi @ 300° F | 000000000 | 00000 |
3/4 | 12 | 4,600 psi @ 72° F | 4,600 psi @ 300° F | 000000000 | 00000 |
1 | 16 | 4,400 psi @ 72° F | 4,400 psi @ 300° F | 000000000 | 00000 |

- For Use With: Hydraulic Fluid, Liquid Nitrogen, Natural Gas, Steam, Water
- Specifications Met: ASME B31.3, ASME B1.20.1, ASME B31.1
316 Stainless Steel | |||||
---|---|---|---|---|---|
Pipe Size | Dash Size | Max. Pressure | Max. Steam Pressure | Each | |
NPT Male | |||||
1/8 | 02 | 9,100 psi @ 72° F | 9,100 psi @ 300° F | 00000000 | 000000 |
1/4 | 04 | 7,500 psi @ 72° F | 7,500 psi @ 300° F | 00000000 | 00000 |
3/8 | 06 | 7,200 psi @ 72° F | 7,200 psi @ 300° F | 000000000 | 00000 |
1/2 | 08 | 5,800 psi @ 72° F | 5,800 psi @ 300° F | 000000000 | 00000 |
3/4 | 12 | 6,400 psi @ 72° F | 6,400 psi @ 300° F | 000000000 | 000000 |
1 | 16 | 4,600 psi @ 72° F | 4,600 psi @ 300° F | 000000000 | 000000 |

- For Use With: Hydraulic Fluid, Liquid Nitrogen, Natural Gas, Steam, Water
- Specifications Met: ASME B1.20.1, ASME B31.1, ASME B31.3
316 Stainless Steel | |||||
---|---|---|---|---|---|
Pipe Size | Dash Size | Max. Pressure | Max. Steam Pressure | Each | |
NPT Female × NPT Male | |||||
1/16 | __ | 7,000 psi @ 72° F | 7,000 psi @ 300° F | 000000000 | 000000 |
1/8 | 02 | 5,500 psi @ 72° F | 5,500 psi @ 300° F | 00000000 | 00000 |
1/4 | 04 | 5,600 psi @ 72° F | 5,600 psi @ 300° F | 000000000 | 00000 |
3/8 | 06 | 5,000 psi @ 72° F | 5,000 psi @ 300° F | 00000000 | 00000 |
1/2 | 08 | 4,500 psi @ 72° F | 4,500 psi @ 300° F | 000000000 | 00000 |
3/4 | 12 | 4,600 psi @ 72° F | 4,600 psi @ 300° F | 000000000 | 00000 |
1 | 16 | 4,400 psi @ 72° F | 4,400 psi @ 300° F | 000000000 | 000000 |

- 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 | ||||||||
1/8 | 1/16 | 02 | __ | 6,500 psi @ 72° F | 6,500 psi @ 300° F | ASME B1.20.1, ASME B31.1, ASME B31.3 | 000000000 | 000000 |
1/8 | 1/4 | 2 | 4 | 5,500 psi @ 72° F | 5,500 psi @ 300° F | ASME B1.20.1, ASME B31.1, ASME B31.3 | 000000000 | 00000 |
1/8 | 3/8 | 2 | 6 | 5,500 psi @ 72° F | 5,500 psi @ 300° F | ASME B1.20.1, ASME B31.1, ASME B31.3 | 000000000 | 00000 |
1/8 | 1/2 | 2 | 8 | 5,500 psi @ 72° F | 5,500 psi @ 300° F | ASME B1.20.1, ASME B31.1, ASME B31.3 | 000000000 | 000000 |
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 | 00000 |
1/4 | 3/8 | 4 | 6 | 5,600 psi @ 72° F | 5,600 psi @ 300° F | ASME B1.20.1, ASME B31.1, ASME B31.3 | 000000000 | 000000 |
1/4 | 1/2 | 4 | 8 | 5,600 psi @ 72° F | 5,600 psi @ 300° F | ASME B1.20.1, ASME B31.1, ASME B31.3 | 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 |
3/8 | 1/2 | 6 | 8 | 5,000 psi @ 72° F | 5,000 psi @ 300° F | ASME B1.20.1, ASME B31.1, ASME B31.3 | 000000000 | 000000 |
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 |
1/2 | 3/4 | 08 | 12 | 4,500 psi @ 72° F | 4,500 psi @ 300° F | ASME B1.20.1, ASME B31.1, ASME B31.3 | 000000000 | 000000 |
3/4 | 1 | 12 | 16 | 3,500 psi @ 72° F | 3,500 psi @ 300° F | ASME B1.20.1, ASME B31.1, ASME B31.3 | 000000000 | 000000 |

- For Use With: Hydraulic Fluid, Liquid Nitrogen, Natural Gas, Steam, Water
- Specifications Met: ASME B1.20.1, ASME B31.1, ASME B31.3
316 Stainless Steel | |||||
---|---|---|---|---|---|
Pipe Size | Dash Size | Max. Pressure | Max. Steam Pressure | Each | |
NPT Female × NPT Male | |||||
1/8 | 02 | 5,500 psi @ 72° F | 5,500 psi @ 300° F | 000000000 | 000000 |
1/4 | 04 | 5,600 psi @ 72° F | 5,600 psi @ 300° F | 000000000 | 00000 |
3/8 | 06 | 5,000 psi @ 72° F | 5,000 psi @ 300° F | 000000000 | 00000 |
1/2 | 08 | 4,500 psi @ 72° F | 4,500 psi @ 300° F | 000000000 | 000000 |

- For Use With: Hydraulic Fluid, Liquid Nitrogen, Natural Gas, Steam, Water
- Specifications Met: ASME B1.20.1, ASME B31.1, ASME B31.3
316 Stainless Steel | |||||
---|---|---|---|---|---|
Pipe Size | Dash Size | Max. Pressure | Max. Steam Pressure | Each | |
NPT Female | |||||
1/16 | __ | 7,000 psi @ 72° F | 7,000 psi @ 300° F | 000000000 | 000000 |
1/8 | 02 | 5,500 psi @ 72° F | 5,500 psi @ 300° F | 00000000 | 00000 |
1/4 | 04 | 5,600 psi @ 72° F | 5,600 psi @ 300° F | 000000000 | 00000 |
3/8 | 06 | 5,000 psi @ 72° F | 5,000 psi @ 300° F | 00000000 | 00000 |
1/2 | 08 | 4,500 psi @ 72° F | 4,500 psi @ 300° F | 000000000 | 000000 |
3/4 | 12 | 4,600 psi @ 72° F | 4,600 psi @ 300° F | 000000000 | 00000 |
1 | 16 | 5,300 psi @ 72° F | 5,300 psi @ 300° F | 00000000 | 000000 |

- For Use With: Hydraulic Fluid, Liquid Nitrogen, Natural Gas, Steam, Water
- Specifications Met: 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 | |||||
1/8 | 02 | 9,700 psi @ 72° F | 9,700 psi @ 300° F | 000000000 | 000000 |
1/4 | 04 | 8,000 psi @ 72° F | 8,000 psi @ 300° F | 000000000 | 00000 |
3/8 | 06 | 7,600 psi @ 72° F | 7,600 psi @ 300° F | 000000000 | 00000 |
1/2 | 08 | 6,200 psi @ 72° F | 6,200 psi @ 300° F | 000000000 | 00000 |
3/4 | 12 | 6,400 psi @ 72° F | 6,400 psi @ 300° F | 000000000 | 000000 |
1 | 16 | 4,600 psi @ 72° F | 4,600 psi @ 300° F | 000000000 | 000000 |

- For Use With: Hydraulic Fluid, Liquid Nitrogen, Natural Gas, Steam, Water
- Specifications Met: ASME B1.20.1, ASME B31.1, ASME B31.3
316 Stainless Steel | |||||
---|---|---|---|---|---|
Pipe Size | Dash Size | Max. Pressure | Max. Steam Pressure | Each | |
NPT Female × NPT Male | |||||
1/8 | 02 | 5,500 psi @ 72° F | 5,500 psi @ 300° F | 000000000 | 000000 |
1/4 | 04 | 5,600 psi @ 72° F | 5,600 psi @ 300° F | 000000000 | 00000 |
3/8 | 06 | 5,000 psi @ 72° F | 5,000 psi @ 300° F | 000000000 | 00000 |
1/2 | 08 | 4,500 psi @ 72° F | 4,500 psi @ 300° F | 000000000 | 000000 |
3/4 | 12 | 3,500 psi @ 72° F | 3,500 psi @ 300° F | 000000000 | 000000 |
1 | 16 | 3,900 psi @ 72° F | 3,900 psi @ 300° F | 000000000 | 000000 |

- For Use With: Hydraulic Fluid, Liquid Nitrogen, Natural Gas, Steam, Water
- Specifications Met: ASME B1.20.1, ASME B31.1, ASME B31.3
316 Stainless Steel | |||||
---|---|---|---|---|---|
Pipe Size | Dash Size | Max. Pressure | Max. Steam Pressure | Each | |
NPT Female × NPT Male | |||||
1/16 | __ | 7,000 psi @ 72° F | 7,000 psi @ 300° F | 000000000 | 000000 |
1/8 | 02 | 5,500 psi @ 72° F | 5,500 psi @ 300° F | 00000000 | 00000 |
1/4 | 04 | 5,600 psi @ 72° F | 5,600 psi @ 300° F | 000000000 | 00000 |
3/8 | 06 | 5,000 psi @ 72° F | 5,000 psi @ 300° F | 00000000 | 00000 |
1/2 | 08 | 4,500 psi @ 72° F | 4,500 psi @ 300° F | 000000000 | 000000 |
3/4 | 12 | 3,500 psi @ 72° F | 3,500 psi @ 300° F | 000000000 | 000000 |
1 | 16 | 3,900 psi @ 72° F | 3,900 psi @ 300° F | 000000000 | 000000 |

- For Use With: Hydraulic Fluid, Liquid Nitrogen, Natural Gas, Steam, Water
- Specifications Met: ASME B1.20.1, ASME B31.1, ASME B31.3
316 Stainless Steel | |||||
---|---|---|---|---|---|
Pipe Size | Dash Size | Max. Pressure | Max. Steam Pressure | Each | |
NPT Female | |||||
1/8 | 02 | 5,500 psi @ 72° F | 5,500 psi @ 300° F | 00000000 | 000000 |
1/4 | 04 | 5,600 psi @ 72° F | 5,600 psi @ 300° F | 000000000 | 00000 |
3/8 | 06 | 5,000 psi @ 72° F | 5,000 psi @ 300° F | 00000000 | 000000 |
1/2 | 08 | 4,500 psi @ 72° F | 4,500 psi @ 300° F | 000000000 | 000000 |
3/4 | 12 | 4,600 psi @ 72° F | 4,600 psi @ 300° F | 000000000 | 000000 |
Through-Wall Fittings for High-Vacuum Chambers
- For Use With: See table
- Environment Temperature Range: 32° to 300° F
- Process Temperature Range: -325° to 995° F
- Tubing: Use with 304/304L or 316/316L stainless steel
- Specifications Met: See table
Transfer liquids and gasses into high-vacuum chambers with these assembled fittings, also known as feedthroughs. Because they form a tight seal on chamber walls, they are often used in coating, cooling, and leak-testing applications where negative pressure (vacuum) must be maintained. These fittings are ready to install and include high-vacuum fittings, metal tubing, and Yor-lok tube fittings. On each end, the Yor-lok fittings include a nut and two sleeves that grip your system’s stainless steel tubing. The entire assembly is stainless steel, so it resists rusting. These fittings are not for use in pressure applications.
Quick-clamp fittings meet ISO 2861, which specifies the dimensions of quick-clamp high-vacuum fittings, clamps, and rings to ensure vacuum tightness. These fittings require a clamp and ring (each sold separately) to complete the connection.
Flanged fittings require a gasket and bolt kit (each sold separately) to complete the connection.
For technical drawings and 3-D models, click on a part number.


For Tube | |||||||||
---|---|---|---|---|---|---|---|---|---|
Flange OD | High-Vacuum Flange Size | OD | Wall Thick. | Lg. | Max. Vacuum | Material | Specifications Met | Each | |
For Use With Liquid Helium, Liquid Methane, Liquid Nitrogen, Liquid Oxygen | |||||||||
1.18" | 16 | 1/4" | 0.028"-0.095" | 9" | 1 × 10 -8 torr @ 72° F | 304 Stainless Steel | ISO 2861 | 0000000 | 0000000 |
1.57" | 25 | 1/4" | 0.028"-0.095" | 9" | 1 × 10 -8 torr @ 72° F | 304 Stainless Steel | ISO 2861 | 0000000 | 000000 |
2.16" | 40 | 1/4" | 0.028"-0.095" | 9" | 1 × 10 -8 torr @ 72° F | 304 Stainless Steel | ISO 2861 | 0000000 | 000000 |
2.95" | 50 | 1/4" | 0.028"-0.095" | 9" | 1 × 10 -8 torr @ 72° F | 304 Stainless Steel | ISO 2861 | 0000000 | 000000 |


Bolt Hole | For Tube | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
Flange OD | High-Vacuum Flange Size | Bolt Circle Dia. | Dia. | No. of | OD | Wall Thick. | Lg. | Max. Vacuum | Material | Each | |
For Use With Liquid Helium, Liquid Methane, Liquid Nitrogen, Liquid Oxygen | |||||||||||
1 21/64" | 16 | 1 1/16" | 11/64" | 6 | 1/4" | 0.028"-0.095" | 9" | 1 × 10 -13 torr @ 72° F | 304 Stainless Steel | 0000000 | 0000000 |
2 3/4" | 40 | 2 5/16" | 17/64" | 6 | 1/4" | 0.028"-0.095" | 9" | 1 × 10 -13 torr @ 72° F | 304 Stainless Steel | 0000000 | 000000 |

Material | ||||||
---|---|---|---|---|---|---|
For Flange OD | For High-Vacuum Flange Size | O-Ring | Inner Ring | Max. Vacuum | Each | |
1.18" | 16 | Fluoroelastomer Rubber | 304 Stainless Steel | 1 × 10 -7 torr @ 72° F | 00000000 | 00000 |
1.57" | 25 | Fluoroelastomer Rubber | 304 Stainless Steel | 1 × 10 -7 torr @ 72° F | 0000000 | 00000 |
2.16" | 40 | Fluoroelastomer Rubber | 304 Stainless Steel | 1 × 10 -7 torr @ 72° F | 0000000 | 00000 |
2.95" | 50 | Fluoroelastomer Rubber | 304 Stainless Steel | 1 × 10 -7 torr @ 72° F | 0000000 | 00000 |

For Flange OD | Gasket Material | Specifications Met | Each | |
1 21/64" | Copper | ASTM F68 | 0000000 | 00000 |