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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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 |
Liquid Nitrogen Hose with Tube Stem Fittings
- Temperature Range: -325° to 1,250° F
- Maximum Vacuum: 29" of Hg @ 72° F
- Material: 316 Stainless Steel with 304 Stainless Steel Braid
The fittings are a short length of tubing that inserts into the end of another tube fitting. Use this air-cleaned hose to transfer liquid nitrogen across a wide temperature range.
Liquid Nitrogen Hose with Yor-Lok Tube Fittings
- Temperature Range: -325° to 1,250° F
- Maximum Vacuum: 29" of Hg @ 72° F
- Material: 316 Stainless Steel with 304 Stainless Steel Braid
The fittings are also known as instrumentation fittings. They have two sleeves (double ferrules) that bite into metal tubing for a strong seal. Use this air-cleaned hose to transfer liquid nitrogen across a wide temperature range.
Liquid Nitrogen Hose with Yor-Lok Tube Fitting and Tube Stem Fitting
- Temperature Range: -325° to 1,250° F
- Maximum Vacuum: 29" of Hg @ 72° F
- Material: 316 Stainless Steel with 304 Stainless Steel Braid
Also known as instrumentation fittings, the Yor-Lok fitting has two sleeves (double ferrules) that bite into metal tubing for a strong seal. The tube stem fitting is a short length of tubing that inserts into the end of another tube fitting. Use this air-cleaned hose to transfer liquid nitrogen across a wide temperature range.
Liquid Nitrogen Hose with Threaded Fittings
- Temperature Range: -320° to 1,500° F
- Maximum Vacuum: 29" of Hg @ 72° F
- Material: 321 Stainless Steel with 304 Stainless Steel Braid
- Female Fittings Swivel Until Tightened
Transfer liquid nitrogen across a wide temperature range with this hose. Hose comes cleaned, capped, and bagged to meet CGA (Compressed Gas Association) G4.1. The braid provides good flexibility in high-vibration applications. Female fittings swivel until tightened for easy installation.
Hose with Cover—A cover surrounds the braid to protect it from damage.
| Pipe Size | Thread Size | ID | OD | Bend Radius | Max. Pressure | 1 1/2 ft. | 3 ft. | 4 ft. | 6 ft. | 8 ft. | 10 ft. | 12 ft. | |
304 Stainless Steel NPT Male × 316 Stainless Steel 45° Flared UNF Female | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 3/8 | 3/4"-16 | 1/2" | 13/16" | 4 7/8" | 1,160 psi @ 72° F | 00000000 | |||||||
316 Stainless Steel 45° Flared UNF Female × 316 Stainless Steel 45° Flared UNF Female | |||||||||||||
| __ | 3/4"-16 × 3/4"-16 | 1/2" | 13/16" | 4 7/8" | 1,160 psi @ 72° F | 00000000 | |||||||
316 Stainless Steel NPT Male × 316 Stainless Steel 45° Flared UNF Female | |||||||||||||
| 1/2 | 3/4"-16 | 1/2" | 13/16" | 4 7/8" | 1,160 psi @ 72° F | 00000000 | |||||||
| Pipe Size | Thread Size | ID | OD | Bend Radius | Max. Pressure | Cover Material | 1 1/2 ft. | 3 ft. | 4 ft. | 6 ft. | 8 ft. | 10 ft. | 12 ft. | |
304 Stainless Steel NPT Male × 316 Stainless Steel 45° Flared UNF Female | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 3/8 | 3/4"-16 | 1/2" | 15/16" | 4 7/8" | 1,160 psi @ 72° F | 304 Stainless Steel | 00000000 | |||||||
316 Stainless Steel 45° Flared UNF Female × 316 Stainless Steel 45° Flared UNF Female | ||||||||||||||
| __ | 3/4"-16 × 3/4"-16 | 1/2" | 15/16" | 4 7/8" | 1,160 psi @ 72° F | 304 Stainless Steel | 00000000 | |||||||
316 Stainless Steel NPT Male × 316 Stainless Steel 45° Flared UNF Female | ||||||||||||||
| 1/2 | 3/4"-16 | 1/2" | 15/16" | 4 7/8" | 1,160 psi @ 72° F | 304 Stainless Steel | 00000000 | |||||||
Liquid Nitrogen Hose with Tube and Threaded Fittings
- Temperature Range: -325° to 1,250° F
- Maximum Vacuum: 29" of Hg @ 72° F
- Material: 316 Stainless Steel with 304 Stainless Steel Braid
The Yor-Lok tube fitting is also known as an instrumentation fitting. It has two sleeves (double ferrules) that bite into metal tubing for a strong seal. Use this air-cleaned hose to transfer liquid nitrogen across a wide temperature range.
Touch-Safe Insulated Cryogenic Hose with Threaded Fittings
- Temperature Range: -325° to 200° F
- Material: 321 Stainless Steel with 304 Stainless Steel Cover
- Both Fittings Swivel Until Tightened
To maintain the temperature of liquids as cold as -325° F, this hose has vacuum insulation and a reflective barrier. This prevents heat transfer in the same way a thermos does, so the exterior of the hose won’t freeze or form condensation. Even when used with liquid argon, liquid carbon dioxide, liquid methane, and liquid nitrogen, this hose is safe to handle. It meets strict ASME design and testing standards for process piping systems.
This hose comes ready to use—you don’t need to create the vacuum yourself. To install, thread the fittings on this hose onto a freezer or other equipment in your plant or laboratory. Both ends swivel until tightened, so you don’t need to rotate the entire hose during installation. With ribbed insulation inside and spiral reinforcement outside, this hose won’t crack or leak when you bend and flex it around obstacles. The cover is 304 stainless steel, which stands up to wear and tear and won’t corrode from mild chemicals and water.
For technical drawings and 3-D models, click on a part number.
Tube Connection | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| CGA Number | For Tube OD | Thread Size | Pipe Size | ID | OD | Bend Radius | Max. Pressure | Specifications Met | 3 ft. | 4 ft. | 6 ft. | 8 ft. | 10 ft. | 12 ft. | |
316 Stainless Steel 37°, 45° Flared UN/UNF (JIC) Female × 316 Stainless Steel Threaded NPT Male | |||||||||||||||
| 295 | 1/4" | 7/16"-20 | 1/4 | 1/4" | 1 1/8" | 6 1/2" | 150 psi @ 72° F | ASME B31.3 | 0000000 | ||||||
| 295 | 3/8" | 9/16"-18 | 3/8 | 3/8" | 1 3/8" | 7 1/2" | 150 psi @ 72° F | ASME B31.3 | 0000000 | ||||||
| 295 | 1/2" | 3/4"-16 | 1/2 | 1/2" | 1 11/16" | 8 1/2" | 150 psi @ 72° F | ASME B31.3 | 0000000 | ||||||
Touch-Safe Insulated Cryogenic Hose with Tube Stem Fittings
- Temperature Range: -325° to 200° F
- Material: 321 Stainless Steel with 304 Stainless Steel Cover
Sealed vacuum insulation and a reflective barrier inside this hose maintains the temperature of liquids as cold as -325° F. Similar to a thermos, this prevents heat transfer, so the exterior of the hose won’t freeze or form condensation. This hose is safe to handle, even when used with liquid nitrogen, liquid argon, liquid carbon dioxide, and liquid methane. It meets strict ASME design and testing standards for process piping systems.
The tube stems on each end slide into tube fittings on a freezer or other equipment in your plant or laboratory. With ribbed insulation inside and spiral reinforcement outside, this hose won’t crack or leak when you bend and flex it around obstacles. The cover is 304 stainless steel, which stands up to wear and tear and won’t corrode from mild chemicals and water.
For technical drawings and 3-D models, click on a part number.
| Stem OD | ID | OD | Bend Radius | Max. Pressure | Specifications Met | 3 ft. | 4 ft. | 6 ft. | 8 ft. | 10 ft. | 12 ft. | |
316 Stainless Steel Tube Stem × 316 Stainless Steel Tube Stem | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1/4" × 1/4" | 1/4" | 1 1/8" | 6 1/2" | 150 psi @ 72° F | ASME B31.3 | 0000000 | ||||||
| 3/8" × 3/8" | 3/8" | 1 3/8" | 7 1/2" | 150 psi @ 72° F | ASME B31.3 | 0000000 | ||||||
| 1/2" × 1/2" | 1/2" | 1 11/16" | 8 1/2" | 150 psi @ 72° F | ASME B31.3 | 0000000 | ||||||