How to Identify and Measure Fittings
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High-Polish Gasket Fittings for Stainless Steel Tubing
- For Use With: Air, Dairy, Water
- Temperature Range: See Gaskets
- Tubing:
Inch Butt-Weld Fittings and Quick-Clamp Fittings: Use with welded 304/304L or 316/316L stainless steel that meets ASTM 269 or ASTM 27
Metric Butt-Weld Fittings: Use with welded or seamless 316 stainless steel - Specifications Met:
304 Stainless Steel Adapters, Caps, and Nuts: 3-A Certified 63-04
Gaskets: See table
Join these fittings with a threaded nut and a gasket for a secure connection that grants you easy access to your line. Also known as bevel seat fittings, the fittings are beveled to fit snugly around the gasket, creating a vibration-resistant seal. Fittings are polished to a smooth finish on the interior to prevent product buildup and bacterial growth.
304 stainless steel fittings have very good corrosion resistance. They’re 3-A certified to meet sanitary design standards. 316 stainless steel fittings have excellent corrosion resistance.
Note: For a complete connection, you’ll need a threaded straight adapter, an unthreaded straight adapter, a gasket, and a nut (all sold separately unless noted).
Butt Weld Tube Connection | ||||||
|---|---|---|---|---|---|---|
| Gasket Connection | Butt Weld Connection | Wall Thick. | Material | Max. Pressure | Each | |
| 1" | 1" | 0.065" | 304 Stainless Steel | 400 psi @ 72° F | 000000000 | 000000 |
| 1 1/2" | 1 1/2" | 0.065" | 304 Stainless Steel | 400 psi @ 72° F | 000000000 | 00000 |
| 2" | 2" | 0.065" | 304 Stainless Steel | 400 psi @ 72° F | 000000000 | 00000 |
| 2 1/2" | 2 1/2" | 0.065" | 304 Stainless Steel | 400 psi @ 72° F | 000000000 | 00000 |
| 3" | 3" | 0.065" | 304 Stainless Steel | 400 psi @ 72° F | 000000000 | 00000 |
| 4" | 4" | 0.083" | 304 Stainless Steel | 400 psi @ 72° F | 000000000 | 00000 |
| 41mm | 1 1/2" | 0.809" | 316 Stainless Steel | 580 psi @ 72° F | 00000000 | 00000 |
| 53mm | 2" | 1.059" | 316 Stainless Steel | 360 psi @ 72° F | 00000000 | 00000 |
For Tube OD | ||||||
|---|---|---|---|---|---|---|
| Gasket Connection | Butt Weld Connection | Wall Thick. | Material | Max. Pressure | Each | |
| 1" | 1" | 0.065" | 304 Stainless Steel | 400 psi @ 72° F | 000000000 | 00000 |
| 1 1/2" | 1 1/2" | 0.065" | 304 Stainless Steel | 400 psi @ 72° F | 000000000 | 00000 |
| 2" | 2" | 0.065" | 304 Stainless Steel | 400 psi @ 72° F | 000000000 | 00000 |
| 2 1/2" | 2 1/2" | 0.065" | 304 Stainless Steel | 400 psi @ 72° F | 000000000 | 00000 |
| 3" | 3" | 0.065" | 304 Stainless Steel | 400 psi @ 72° F | 000000000 | 00000 |
| 4" | 4" | 0.083" | 304 Stainless Steel | 400 psi @ 72° F | 000000000 | 00000 |
| 41mm | 1 1/2" | 0.809" | 316 Stainless Steel | 580 psi @ 72° F | 00000000 | 00000 |
| 53mm | 2" | 1.059" | 316 Stainless Steel | 360 psi @ 72° F | 00000000 | 00000 |
| 70mm | 70mm | 37mm | 316 Stainless Steel | 360 psi @ 72° F | 00000000 | 00000 |
| For Tube OD | Nut Material | Max. Pressure | Each | |
| 1" | 304 Stainless Steel | 400 psi @ 72° F | 000000000 | 000000 |
| 1 1/2" | 304 Stainless Steel | 400 psi @ 72° F | 000000000 | 00000 |
| 2" | 304 Stainless Steel | 400 psi @ 72° F | 000000000 | 00000 |
| 2 1/2" | 304 Stainless Steel | 400 psi @ 72° F | 000000000 | 00000 |
| 3" | 304 Stainless Steel | 400 psi @ 72° F | 000000000 | 00000 |
| 4" | 304 Stainless Steel | 400 psi @ 72° F | 000000000 | 00000 |
| 41mm | 304 Stainless Steel | 580 psi @ 72° F | 00000000 | 00000 |
| 53mm | 304 Stainless Steel | 360 psi @ 72° F | 00000000 | 00000 |
| 70mm | 304 Stainless Steel | 360 psi @ 72° F | 00000000 | 00000 |
| For Tube OD | ID | OD | Thick. | Temp. Range, °F | Color | Specifications Met | Each | |
Buna-N Rubber | ||||||||
|---|---|---|---|---|---|---|---|---|
| 1" | 0.900" | 1.325" | 0.3" | -30° to 200° | Black | __ | 0000000 | 00000 |
| 1 1/2" | 1 3/8" | 1 7/8" | 0.33" | -30° to 200° | Black | __ | 0000000 | 0000 |
| 2" | 1.850" | 2 3/8" | 0.35" | -30° to 200° | Black | __ | 0000000 | 0000 |
| 2 1/2" | 2.340" | 2.950" | 0.35" | -30° to 200° | Black | __ | 0000000 | 0000 |
| 3" | 2 7/8" | 3.475" | 0.35" | -30° to 200° | Black | __ | 0000000 | 0000 |
| 4" | 3.700" | 4 1/2" | 0.45" | -30° to 200° | Black | __ | 0000000 | 0000 |
| 41mm | 42.000mm | 52.000mm | 5mm | -30° to 200° | Blue | __ | 0000000 | 0000 |
| 53mm | 54.000mm | 64.000mm | 5mm | -30° to 200° | Blue | __ | 0000000 | 0000 |
| 70mm | 71.000mm | 81.000mm | 5mm | -30° to 200° | Blue | __ | 0000000 | 00000 |
PTFE Plastic | ||||||||
| 1" | 0.900" | 1.325" | 0.3" | -100° to 500° | White | 3-A Certified 20-27 | 0000000 | 0000 |
| 1 1/2" | 1 3/8" | 1 7/8" | 0.33" | -100° to 500° | White | 3-A Certified 20-27 | 0000000 | 0000 |
| 2" | 1.850" | 2 3/8" | 0.35" | -100° to 500° | White | 3-A Certified 20-27 | 0000000 | 0000 |
| 2 1/2" | 2.340" | 2.950" | 0.35" | -100° to 500° | White | 3-A Certified 20-27 | 0000000 | 0000 |
| 3" | 2 7/8" | 3.475" | 0.35" | -100° to 500° | White | 3-A Certified 20-27 | 0000000 | 0000 |
| 4" | 3.700" | 4 1/2" | 0.33" | -100° to 500° | White | 3-A Certified 20-27 | 0000000 | 0000 |
316 Stainless Steel/PTFE Plastic Blend | ||||||||
| 1" | 0.900" | 1.325" | 0.32" | -350° to 550° | Gray | 3-A Certified 20-27, FDA Compliant 21 CFR 177.1550, USP VI Certified | 0000000 | 00000 |
| 1 1/2" | 1 3/8" | 1 7/8" | 0.32" | -350° to 550° | Gray | 3-A Certified 20-27, FDA Compliant 21 CFR 177.1550, USP VI Certified | 0000000 | 00000 |
| 2" | 1.850" | 2 3/8" | 0.32" | -350° to 550° | Gray | 3-A Certified 20-27, FDA Compliant 21 CFR 177.1550, USP VI Certified | 0000000 | 00000 |
| 2 1/2" | 2.340" | 2.950" | 0.32" | -350° to 550° | Gray | 3-A Certified 20-27, FDA Compliant 21 CFR 177.1550, USP VI Certified | 0000000 | 00000 |
| 3" | 2 7/8" | 3.475" | 0.32" | -350° to 550° | Gray | 3-A Certified 20-27, FDA Compliant 21 CFR 177.1550, USP VI Certified | 0000000 | 00000 |
| 4" | 3.700" | 4 1/2" | 0.32" | -350° to 550° | Gray | 3-A Certified 20-27, FDA Compliant 21 CFR 177.1550, USP VI Certified | 0000000 | 00000 |
Ultra-High-Polish Gasket Fittings for Stainless Steel Tubing
- For Use With: Ammonia, Argon, Butane, Carbon Dioxide, Chloride, Fluoride, Fluorocarbon, Germane, Halide, Helium, Hydrogen, Krypton, Laser Gas, Natural Gas, Neon, Nitrogen, Oxygen, Silane, Sulfur Hexafluoride, Tungsten Hexafluoride, Xenon
- Temperature Range: -420° to 1000° F
- Tubing: Use with 316/316L stainless steel
- Compatible With: Swagelok® VCR
Polished to at least a 15 Ra finish on the inside, these fittings have an ultra-smooth interior surface that helps prevent contamination. Also known as ultra-high-purity fittings, they’re packed in a Class 100 clean room, cleaned, and double bagged. They are commonly used in semiconductor applications. Fittings use a metal gasket (sold separately), which generates fewer particles than a rubber gasket and creates a strong seal in high-pressure and ultra-high-vacuum applications. Fittings are 316 stainless steel for excellent corrosion resistance.
To assemble, place a gasket between the gasket ends before gently rotating the female-threaded fitting onto the male-threaded fitting. Tighten until 1/8 of a turn past finger tight.
Choose threaded fittings to attach directly to other fittings. Or, choose one of the following types of fittings to attach directly to tubing:
Butt-weld fittings allow for a smooth, flush connection that provides maximum flow.
Adapters with an unthreaded gasket fitting connection are also known as glands.
For Tube OD | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Gasket | Butt Weld | Wall Thick. | Lg. | Material | Max. Pressure | Max. Vacuum | Interior Smoothness, Ra | Environmental Rating | Each | |
| 1/8" | 1/8" | 0.028" | 1 5/64" | 316L Stainless Steel | 8,500 psi @ 72° F | 10 -11 torr @ 72° F | 5 | Fed. Std. Class 100 | 00000000 | 000000 |
| 1/8" | 1/8" | 0.028" | 1 27/64" | 316L Stainless Steel | 8,500 psi @ 72° F | 10 -11 torr @ 72° F | 5 | Fed. Std. Class 100 | 00000000 | 00000 |
| 1/4" | 1/4" | 0.035" | 19/32" | 316L Stainless Steel | 5,100 psi @ 72° F | 10 -11 torr @ 72° F | 5 | Fed. Std. Class 100 | 0000000 | 00000 |
| 1/4" | 1/4" | 0.035" | 23/32" | 316L Stainless Steel | 5,100 psi @ 72° F | 10 -11 torr @ 72° F | 5 | Fed. Std. Class 100 | 00000000 | 00000 |
| 1/4" | 1/4" | 0.035" | 1 3/32" | 316L Stainless Steel | 5,100 psi @ 72° F | 10 -11 torr @ 72° F | 5 | Fed. Std. Class 100 | 0000000 | 00000 |
| 1/4" | 1/4" | 0.035" | 1 25/32" | 316L Stainless Steel | 5,100 psi @ 72° F | 10 -11 torr @ 72° F | 5 | Fed. Std. Class 100 | 00000000 | 00000 |
| 1/4" | 1/4" | 0.039" | 1 5/32" | 316L Stainless Steel | 5,100 psi @ 72° F | 10 -11 torr @ 72° F | 5 | Fed. Std. Class 100 | 00000000 | 00000 |
| 1/4" | 1/4" | 0.039" | 1 11/16" | 316L Stainless Steel | 5,100 psi @ 72° F | 10 -11 torr @ 72° F | 5 | Fed. Std. Class 100 | 00000000 | 00000 |
| 1/2" | 1/2" | 0.049" | 1 1/8" | 316L Stainless Steel | 3,500 psi @ 72° F | 10 -11 torr @ 72° F | 5 | Fed. Std. Class 100 | 0000000 | 00000 |
| 1/2" | 1/2" | 0.049" | 1 25/32" | 316L Stainless Steel | 3,750 psi @ 72° F | 10 -11 torr @ 72° F | 5 | Fed. Std. Class 100 | 00000000 | 00000 |
| 3/4" | 3/4" | 0.065" | 1 9/64" | 316L Stainless Steel | 3,350 psi @ 72° F | 10 -11 torr @ 72° F | 5 | Fed. Std. Class 100 | 00000000 | 00000 |
| 3/4" | 3/4" | 0.065" | 2 1/32" | 316L Stainless Steel | 3,350 psi @ 72° F | 10 -11 torr @ 72° F | 5 | Fed. Std. Class 100 | 00000000 | 00000 |
| 1" | 1" | 0.065" | 1 1/4" | 316L Stainless Steel | 2,400 psi @ 72° F | 10 -11 torr @ 72° F | 5 | Fed. Std. Class 100 | 00000000 | 00000 |
| 1" | 1" | 0.065" | 2 5/16" | 316L Stainless Steel | 2,400 psi @ 72° F | 10 -11 torr @ 72° F | 5 | Fed. Std. Class 100 | 00000000 | 00000 |
Adapters with an unthreaded gasket fitting connection are also known as glands.
For Tube OD | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Gasket | Butt Weld | Wall Thick. | Lg. | Material | Max. Pressure | Max. Vacuum | Interior Smoothness, Ra | Environmental Rating | Each | |
| 1/4" | 1/8" | 0.028" | 1 3/32" | 316L Stainless Steel | 5,100 psi @ 72° F | 10 -11 torr @ 72° F | 5 | Fed. Std. Class 100 | 00000000 | 000000 |
| 1/4" | 1/8" | 0.028" | 1 13/32" | 316L Stainless Steel | 5,100 psi @ 72° F | 10 -11 torr @ 72° F | 5 | Fed. Std. Class 100 | 00000000 | 00000 |
| 1/2" | 1/4" | 0.035" | 1 1/8" | 316L Stainless Steel | 3,750 psi @ 72° F | 10 -11 torr @ 72° F | 5 | Fed. Std. Class 100 | 00000000 | 00000 |
| 1/2" | 1/4" | 0.035" | 1 25/32" | 316L Stainless Steel | 3,750 psi @ 72° F | 10 -11 torr @ 72° F | 5 | Fed. Std. Class 100 | 00000000 | 00000 |
| 1/2" | 3/8" | 0.035" | 1 1/8" | 316L Stainless Steel | 3,750 psi @ 72° F | 10 -11 torr @ 72° F | 5 | Fed. Std. Class 100 | 00000000 | 00000 |
| 1/2" | 3/8" | 0.035" | 1 25/32" | 316L Stainless Steel | 3,750 psi @ 72° F | 10 -11 torr @ 72° F | 5 | Fed. Std. Class 100 | 00000000 | 00000 |
| For Tube OD | Nut Material | Max. Pressure | Max. Vacuum | Lg. | Each | |
Male | ||||||
|---|---|---|---|---|---|---|
| 1/8" | 316L Stainless Steel | 8,500 psi @ 72° F | 10 -11 torr @ 72° F | 1/2" | 00000000 | 00000 |
| 1/4" | 316L Stainless Steel | 5,100 psi @ 72° F | 10 -11 torr @ 72° F | 17/32" | 00000000 | 0000 |
| 1/4" | 316L Stainless Steel | 5,100 psi @ 72° F | 10 -11 torr @ 72° F | 23/32" | 0000000 | 0000 |
| 1/2" | 316L Stainless Steel | 3,500 psi @ 72° F | 10 -11 torr @ 72° F | 13/16" | 0000000 | 00000 |
| 3/4" | 316L Stainless Steel | 3,350 psi @ 72° F | 10 -11 torr @ 72° F | 1" | 00000000 | 00000 |
| 1" | 316L Stainless Steel | 2,400 psi @ 72° F | 10 -11 torr @ 72° F | 1 3/16" | 00000000 | 00000 |
Female | ||||||
| 1/8" | 316L Stainless Steel | 8,500 psi @ 72° F | 10 -11 torr @ 72° F | 17/32" | 00000000 | 0000 |
| 1/4" | 316L Stainless Steel | 5,100 psi @ 72° F | 10 -11 torr @ 72° F | 13/16" | 0000000 | 0000 |
| 1/2" | 316L Stainless Steel | 3,500 psi @ 72° F | 10 -11 torr @ 72° F | 7/8" | 0000000 | 00000 |
| 3/4" | 316L Stainless Steel | 3,350 psi @ 72° F | 10 -11 torr @ 72° F | 1 1/8" | 00000000 | 00000 |
| 1" | 316L Stainless Steel | 2,400 psi @ 72° F | 10 -11 torr @ 72° F | 1 11/32" | 00000000 | 00000 |
Retaining
Tabs
Hard and heat resistant, stainless steel gaskets can be used in a wider range of applications than nickel gaskets such as carbon monoxide and ozone. However, they’re harder to tighten than nickel gaskets, and they’ll wear down sealing surfaces more quickly.
Silver-plated stainless steel gaskets are softer than unfinished stainless steel gaskets, so they won’t wear down sealing surfaces as much, and they’re easier to tighten. However, they oxidize when exposed to air, and silver particles might flake off during assembly.
Nickel gaskets are softer than stainless steel gaskets, so they won’t wear down sealing surfaces as much, and they’re easier to tighten. They’re reactive to carbon monoxide and ozone, so they shouldn’t be used with those chemicals.
Gaskets with retaining tabs stay in place during installation, so you don’t have to hold the gasket while fastening fittings together. This also means they’re less likely to scratch or nick your fittings by rotating during installation.
| For Tube OD | Max. Vacuum | Environmental Rating | Each | |
316L Stainless Steel Gasket | ||||
|---|---|---|---|---|
| 1/4" | 10 -11 torr @ 72° F | Fed. Std. Class 100 | 0000000 | 00000 |
| 1/2" | 10 -11 torr @ 72° F | Fed. Std. Class 100 | 0000000 | 0000 |
| 3/4" | 10 -11 torr @ 72° F | Fed. Std. Class 100 | 00000000 | 0000 |
| 1" | 10 -11 torr @ 72° F | Fed. Std. Class 100 | 00000000 | 0000 |
Silver-Plated 316L Stainless Steel Gasket | ||||
| 1/4" | 10 -11 torr @ 72° F | Fed. Std. Class 100 | 00000000 | 0000 |
| 1/2" | 10 -11 torr @ 72° F | Fed. Std. Class 100 | 00000000 | 0000 |
Nickel Gasket with Retaining Tabs | ||||
| 1/4" | 10 -11 torr @ 72° F | Fed. Std. Class 100 | 00000000 | 0000 |
| 1/2" | 10 -11 torr @ 72° F | Fed. Std. Class 100 | 00000000 | 0000 |
316L Stainless Steel Gasket with Retaining Tabs | ||||
| 1/4" | 10 -11 torr @ 72° F | Fed. Std. Class 100 | 00000000 | 0000 |
| 1/2" | 10 -11 torr @ 72° F | Fed. Std. Class 100 | 00000000 | 0000 |
Vibration-Resistant Ultra-High-Polish Gasket Fittings for Stainless Steel Tubing
- For Use With: Carbon Dioxide, Ammonia, Chloride, Fluoride, Fluorine, Germane, Fluorocarbon, Halide, Helium, Hydrogen, Argon, Krypton, Oxygen, Laser Gas, Natural Gas, Neon, Butane, Xenon, Tungsten Hexafluoride, Silane, Sulfur Hexafluoride, Nitrogen
- Temperature Range: -420° to 1000° F, except nickel gaskets are -325° to 600° F
- Tubing: Use with 316/316L stainless steel
- Specifications Met: MIL-STD-810
Use these fittings in applications ranging from semiconductor manufacturing to satellites and rockets. They resist high vibration and ultra-high vacuum while maintaining high purity. Two anti-torque rings stop the fittings from twisting your tubing or component during installation. This also prevents the fittings from loosening or leaking from high vibration, so they’re safe to use with hazardous gases. All are compatible with Swagelok® VCR fittings.
Also known as ultra-high-purity fittings, these fittings were packed in a Class 100 clean room, so they arrive without contaminants. They're also designed from inside and out to prevent the creation of contaminants. Made of stainless steel, they won’t rust. Their anti-torque rings prevent galling, which extends the life of the seal while limiting particles. A metal gasket, instead of a rubber one, also reduces the potential for particles. And their interior is polished to a 7 Ra finish—the same as a high-quality stainless steel sink—to prevent particles from clinging to the inside.
Choose from fully assembled fittings or build a custom fitting. For a complete fitting, you'll need two anti-torque rings, two adapters, a male and female nut, and a gasket.
| For Tube OD | Wall Thickness | Lg. | Material | Gasket Material | Max. Pressure | Max. Vacuum | Includes | Each | |
| 1/4" | 0.035" | 1 13/16" | 316/316L Stainless Steel | Nickel | 4,000 psi @ 72° F | 10 -11 torr @ 72° F | Two Adapters, Two Anti-Torque Rings, Gasket, Male Nut, Female Nut | 0000000 | 000000 |
| 1/2" | 0.049" | 2 15/16" | 316/316L Stainless Steel | Nickel | 2,800 psi @ 72° F | 10 -11 torr @ 72° F | Two Adapters, Two Anti-Torque Rings, Gasket, Male Nut, Female Nut | 0000000 | 000000 |
These adapters are also known as glands.
| For Tube OD | Wall Thick. | Lg. | Material | Max. Pressure | Max. Vacuum | Each | |
| 1/4" | 0.035" | 1 1/8" | 316/316L Stainless Steel | 4,000 psi @ 72° F | 10 -11 torr @ 72° F | 0000000 | 000000 |
| 1/4" | 0.035" | 1 3/4" | 316/316L Stainless Steel | 4,000 psi @ 72° F | 10 -11 torr @ 72° F | 0000000 | 00000 |
| 1/2" | 0.049" | 1 1/8" | 316/316L Stainless Steel | 2,800 psi @ 72° F | 10 -11 torr @ 72° F | 0000000 | 00000 |
| 1/2" | 0.049" | 1 13/16" | 316/316L Stainless Steel | 2,800 psi @ 72° F | 10 -11 torr @ 72° F | 0000000 | 00000 |
| For Tube OD | Nut Material | Max. Pressure | Max. Vacuum | Each | |
Male | |||||
|---|---|---|---|---|---|
| 1/4" | 316/316L Stainless Steel | 4,000 psi @ 72° F | 10 -11 torr @ 72° F | 0000000 | 00000 |
| 1/2" | 316/316L Stainless Steel | 2,800 psi @ 72° F | 10 -11 torr @ 72° F | 0000000 | 00000 |
Female | |||||
| 1/4" | 316/316L Stainless Steel | 4,000 psi @ 72° F | 10 -11 torr @ 72° F | 0000000 | 0000 |
| 1/2" | 316/316L Stainless Steel | 2,800 psi @ 72° F | 10 -11 torr @ 72° F | 0000000 | 00000 |
Nickel gaskets are softer than stainless steel gaskets, so they won’t wear down sealing surfaces as much, and they’re easier to tighten. However, they don’t withstand temperatures as high. They’re reactive to carbon monoxide and ozone, so they shouldn’t be used with those chemicals.
Stainless steel gaskets are a more universal gasket material than nickel gaskets. They’re also stronger and better at handling high temperatures. You can use them with carbon monoxide and ozone. However, they’re harder to tighten than nickel gaskets, and they’ll wear down sealing surfaces more quickly.
