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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Compression Fittings for Plastic Tubing—Chemicals
- For Use With: PFA Plastic: Hydrochloric Acid, Sulfuric Acid
PTFE Plastic: Alcohol, Ammonia, Benzoic Acid, Bleach, Bromine, Coolant, Fluoboric Acid, Hydrochloric Acid, Hydrofluoric Acid, Nitric Acid, Organic Solvents, Sodium Carbonate, Sulfuric Acid - Temperature Range: PFA Plastic: 0° to 350° F
PTFE Plastic: -40° to 185° F - Tubing: PFA Plastic: Use with hard (Durometer 50D-65D) PFA or PTFE plastic
PTFE Plastic: Use with hard (Durometer 60D) PFA or PTFE plastic
A sleeve (ferrule) compresses the tubing as you tighten the nut, creating a strong seal. The nut and sleeve are included. Fittings are also known as flareless fittings. Fittings that include a gripper sleeve on the tubing create an even tighter seal.
PTFE fittings are highly resistant to most acids, alcohols, detergents, and solvents. They’re made by machining. Their nut is made of PVDF, which is resistant to halogens such as chlorine and bromine, strong acids such as hydrofluoric and nitric acids, and organic solvents.
For technical drawings and 3-D models, click on a part number.
Through-wall fittings are also known as bulkhead couplings and panel-mount couplings; they mount through your wall or panel to create an inlet or outlet.
Quick-Disconnect Couplings for Plastic and Rubber Tubing—Chemicals
- For Use With: Ammonia, Ethanol, Phosphoric Acid (70%), Sodium Carbonate
- Temperature Range: 32° to 160° F
Couplings consist of a plug and a socket (sold separately) that join with a latch, so you can frequently connect and disconnect your line. To connect, insert the plug into the socket; to disconnect, press the latch on the socket and remove the plug. Plugs and sockets are polypropylene, which has excellent chemical, impact, and abrasion resistance.
Plugs and sockets with shut-off have a valve to stop the flow when the coupling is separated so fluid won’t spill from your line.
Note: For a complete coupling, order a plug and a socket with the same coupling size.
For technical drawings and 3-D models, click on a part number.
Barbed sockets insert into tubing and secure with a clamp.
Through-wall sockets are also known as bulkhead sockets and panel-mount sockets; they mount through your wall or panel to create an inlet or outlet.
| Coupling Size | For Plug OD | For Tube ID | Material | Color | Max. Pressure | For Hole Dia. | For Max. Wall Thick. | Each | |
Open Flow | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| 1/8 | 5/16" | 1/8" | Polypropylene Plastic | Beige | 120 psi @ 72° F | 1/2" | 1/2" | 00000000 | 000000 |
| 1/4 | 7/16" | 1/4" | Polypropylene Plastic | Beige | 120 psi @ 72° F | 11/16" | 1/2" | 00000000 | 00000 |
| 1/4 | 7/16" | 3/8" | Polypropylene Plastic | Beige | 120 psi @ 72° F | 11/16" | 1/2" | 00000000 | 00000 |
| 3/8 | 3/4" | 3/8" | Polypropylene Plastic | Gray | 60 psi @ 72° F | 1 3/16" | 1/4" | 00000000 | 00000 |
| 3/8 | 3/4" | 1/2" | Polypropylene Plastic | Gray | 60 psi @ 72° F | 1 3/16" | 1/4" | 00000000 | 00000 |
With Shut-Off | |||||||||
| 1/8 | 5/16" | 1/8" | Polypropylene Plastic | Beige | 120 psi @ 72° F | 1/2" | 1/2" | 00000000 | 00000 |
| 1/8 | 5/16" | 1/4" | Polypropylene Plastic | Beige | 120 psi @ 72° F | 1/2" | 1/2" | 00000000 | 00000 |
| 1/4 | 7/16" | 1/4" | Polypropylene Plastic | Beige | 120 psi @ 72° F | 11/16" | 1/2" | 00000000 | 00000 |
| 1/4 | 7/16" | 3/8" | Polypropylene Plastic | Beige | 120 psi @ 72° F | 11/16" | 1/2" | 00000000 | 00000 |
| 3/8 | 3/4" | 3/8" | Polypropylene Plastic | Gray | 60 psi @ 72° F | 1 3/16" | 1/4" | 00000000 | 00000 |
| 3/8 | 3/4" | 1/2" | Polypropylene Plastic | Gray | 60 psi @ 72° F | 1 3/16" | 1/4" | 00000000 | 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 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.
For technical drawings and 3-D models, click on a part number.
Through-wall fittings mount through your wall or panel to create an inlet or outlet. They’re also known as bulkhead couplings and panel-mount couplings.
| For Tube OD | Material | Max. Pressure | Max. Vacuum | Interior Smoothness, Ra | Environmental Rating | Each | |
| 1/4" | 316L Stainless Steel | 5,100 psi @ 72° F | 10 -11 torr @ 72° F | 5 | Fed. Std. Class 100 | 00000000 | 000000 |
| For Tube OD | Nut Material | Max. Pressure | Max. Vacuum | Lg. | Each | |
Male | ||||||
|---|---|---|---|---|---|---|
| 1/4" | 316L Stainless Steel | 5,100 psi @ 72° F | 10 -11 torr @ 72° F | 17/32" | 00000000 | 00000 |
| 1/4" | 316L Stainless Steel | 5,100 psi @ 72° F | 10 -11 torr @ 72° F | 23/32" | 0000000 | 0000 |
Female | ||||||
| 1/4" | 316L Stainless Steel | 5,100 psi @ 72° F | 10 -11 torr @ 72° F | 13/16" | 0000000 | 0000 |
Retaining
Tabs
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.
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.
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 | |
Nickel Gasket | ||||
|---|---|---|---|---|
| 1/4" | 10 -11 torr @ 72° F | Fed. Std. Class 100 | 00000000 | 00000 |
316L Stainless Steel Gasket | ||||
| 1/4" | 10 -11 torr @ 72° F | Fed. Std. Class 100 | 0000000 | 0000 |
Silver-Plated 316L Stainless Steel Gasket | ||||
| 1/4" | 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 |