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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Plastic Push-to-Connect Tube Fittings for Chemicals
- For Use With: Inch: Alcohol, Hydrochloric Acid, Nitric Acid, Sodium Carbonate, Sulfuric Acid
Metric: Acetic Acid, Alcohol, Arsenic Acid, Benzoic Acid, Fluoboric Acid, Sodium Carbonate, Sulfuric Acid - Temperature Range: Inch: 0° to 270° F
Metric: 32° to 175° F - Tubing: Use with hard (Durometer 55D-60D) FEP plastic
Also known as instant fittings, these chemical-resistant plastic fittings connect to tubing with a push. An internal gripping ring holds the tubing tight. To disconnect, push on the release ring and pull the tubing out of the fitting. Use these fittings in low-pressure applications.
PPS fittings resist a wide variety of chemicals, although are not for use with hydrochloric acid or nitric acid. They withstand temperatures up to 175° F.
PVDF fittings offer excellent chemical resistance, and can be used with hydrochloric acid and nitric acid. They withstand temperatures up to 270° F, higher than other push-to-connect fittings for chemicals. They are produced in a clean room and are bagged individually to prevent dirt and moisture from contaminating the inside. PVDF is also known as Kynar.
NPTF (Dryseal) threads are compatible with NPT threads.
For technical drawings and 3-D models, click on a part number.
Threaded connections can be taken apart as needed for maintenance and repair.
| For Tube OD | Pipe Size | Material | Color | Release Ring Color | Max. Pressure | Each | |
NPTF Threads | |||||||
|---|---|---|---|---|---|---|---|
| 1/4" | 1/8 | PVDF Plastic | Black | Gray | 300 psi @ 72° F | 0000000 | 00000 |
| 1/4" | 1/4 | PVDF Plastic | Black | Gray | 300 psi @ 72° F | 0000000 | 0000 |
| 1/4" | 3/8 | PVDF Plastic | Black | Gray | 300 psi @ 72° F | 0000000 | 00000 |
| 5/16" | 1/4 | PVDF Plastic | Black | Gray | 300 psi @ 72° F | 00000000 | 00000 |
| 3/8" | 1/4 | PVDF Plastic | Black | Gray | 300 psi @ 72° F | 0000000 | 0000 |
| 3/8" | 3/8 | PVDF Plastic | Black | Gray | 300 psi @ 72° F | 0000000 | 0000 |
BSPT Threads | |||||||
| 4mm | 1/8 | PPS Plastic | Gray | Gray | 130 psi @ 72° F | 0000000 | 00000 |
| 6mm | 1/8 | PPS Plastic | Gray | Gray | 130 psi @ 72° F | 0000000 | 00000 |
| 6mm | 1/4 | PPS Plastic | Gray | Gray | 130 psi @ 72° F | 0000000 | 00000 |
| 8mm | 1/8 | PPS Plastic | Gray | Gray | 130 psi @ 72° F | 0000000 | 00000 |
| 8mm | 1/4 | PPS Plastic | Gray | Gray | 130 psi @ 72° F | 0000000 | 00000 |
| 8mm | 3/8 | PPS Plastic | Gray | Gray | 130 psi @ 72° F | 0000000 | 00000 |
| 10mm | 1/4 | PPS Plastic | Gray | Gray | 130 psi @ 72° F | 0000000 | 00000 |
| 12mm | 3/8 | PPS Plastic | Gray | Gray | 130 psi @ 72° F | 0000000 | 00000 |
Fittings with intermittent swivel rotate 360° before and after installation as needed to allow movement in the system and to prevent kinking.
Threaded connections can be taken apart as needed for maintenance and repair.
| For Tube OD | Pipe Size | Material | Color | Release Ring Color | Max. Pressure | Each | |
NPTF Threads | |||||||
|---|---|---|---|---|---|---|---|
| 1/4" | 1/8 | PVDF Plastic | Black | Gray | 300 psi @ 72° F | 0000000 | 00000 |
| 1/4" | 1/4 | PVDF Plastic | Black | Gray | 300 psi @ 72° F | 0000000 | 0000 |
| 1/4" | 3/8 | PVDF Plastic | Black | Gray | 300 psi @ 72° F | 0000000 | 00000 |
| 3/8" | 1/8 | PVDF Plastic | Black | Gray | 300 psi @ 72° F | 0000000 | 00000 |
| 3/8" | 1/4 | PVDF Plastic | Black | Gray | 300 psi @ 72° F | 0000000 | 00000 |
| 3/8" | 3/8 | PVDF Plastic | Black | Gray | 300 psi @ 72° F | 0000000 | 00000 |
Threaded connections can be taken apart as needed for maintenance and repair.
Fittings with tube stem insert into the push-to-connect end of another fitting in place of a length of tubing.
| Tube Stem OD | For Tube OD | Material | Color | Release Ring Color | Max. Pressure | Each | |
| 1/4" | 1/4" | PVDF Plastic | Black | Gray | 300 psi @ 72° F | 0000000 | 00000 |
| 1/4" | 3/8" | PVDF Plastic | Black | Gray | 300 psi @ 72° F | 0000000 | 0000 |
| 5/16" | 5/16" | PVDF Plastic | Black | Gray | 300 psi @ 72° F | 00000000 | 00000 |
| 3/8" | 1/4" | PVDF Plastic | Black | Gray | 300 psi @ 72° F | 0000000 | 0000 |
| 3/8" | 3/8" | PVDF Plastic | Black | Gray | 300 psi @ 72° F | 0000000 | 0000 |
| 1/2" | 1/2" | PVDF Plastic | Black | Gray | 300 psi @ 72° F | 0000000 | 00000 |
Fittings with tube stem insert into the push-to-connect end of another fitting in place of a length of tubing.
| For Tube OD | Material | Color | Release Ring Color | Max. Pressure | Each | |
| 1/4" | PVDF Plastic | Black | Black | 300 psi @ 72° F | 0000000 | 00000 |
| 5/16" | PVDF Plastic | Black | Black | 300 psi @ 72° F | 00000000 | 00000 |
| 3/8" | PVDF Plastic | Black | Black | 300 psi @ 72° F | 0000000 | 00000 |
| 1/2" | PVDF Plastic | Black | Black | 300 psi @ 72° F | 0000000 | 00000 |
| 4mm | PPS Plastic | Gray | Gray | 130 psi @ 72° F | 0000000 | 00000 |
| 6mm | PPS Plastic | Gray | Gray | 130 psi @ 72° F | 0000000 | 00000 |
| 8mm | PPS Plastic | Gray | Gray | 130 psi @ 72° F | 0000000 | 00000 |
| For Tube OD (A) | For Tube OD (B) | Material | Color | Release Ring Color | Max. Pressure | Each | |
| 3/8" | 1/4" | PVDF Plastic | Black | Gray | 300 psi @ 72° F | 0000000 | 00000 |
Stainless Steel Push-to-Connect Tube Fittings for Chemicals
(SAE Straight) Male
Threads with Gasket
- For Use With: Alcohol, Bleach, Lubricated Air, Nitric Acid, Sodium Carbonate, Sulfuric Acid
- Temperature Range: 0° to 175° F
- Tubing: Use with firm or hard (Durometer 80A-60D) FEP, polyethylene, or PTFE plastic
Fittings are 316 stainless steel, which has excellent chemical resistance and is more durable than plastic. Also known as instant fittings, they connect to tubing with a push, and an internal gripping ring and O-ring hold the tubing tight. Instead of a release ring, these fittings have a release sleeve that slides back to disconnect tubing.
Metric and UN/UNF (SAE Straight) male threads have a gasket to protect against leaks. UN/UNF (SAE Straight) threads are also known as O-ring boss threads.
For technical drawings and 3-D models, click on a part number.
(SAE Straight) Male
Threads with Gasket
| For Tube OD | Pipe Size | Thread Size | Thread Pitch, mm | Material | Gasket Material | Max. Pressure | Each | |
NPT Threads | ||||||||
|---|---|---|---|---|---|---|---|---|
| 1/4" | 1/8 | __ | __ | 316 Stainless Steel | __ | 345 psi @ 72° F | 0000000 | 000000 |
| 1/4" | 1/4 | __ | __ | 316 Stainless Steel | __ | 345 psi @ 72° F | 00000000 | 00000 |
| 1/4" | 3/8 | __ | __ | 316 Stainless Steel | __ | 345 psi @ 72° F | 00000000 | 00000 |
| 3/8" | 1/4 | __ | __ | 316 Stainless Steel | __ | 345 psi @ 72° F | 00000000 | 000000 |
| 3/8" | 3/8 | __ | __ | 316 Stainless Steel | __ | 345 psi @ 72° F | 00000000 | 000000 |
| 3/8" | 1/2 | __ | __ | 316 Stainless Steel | __ | 345 psi @ 72° F | 00000000 | 000000 |
| 1/2" | 1/4 | __ | __ | 316 Stainless Steel | __ | 345 psi @ 72° F | 00000000 | 000000 |
| 1/2" | 1/2 | __ | __ | 316 Stainless Steel | __ | 345 psi @ 72° F | 0000000 | 000000 |
| 6mm | 1/8 | __ | __ | 316 Stainless Steel | __ | 345 psi @ 72° F | 00000000 | 00000 |
| 6mm | 1/4 | __ | __ | 316 Stainless Steel | __ | 345 psi @ 72° F | 00000000 | 00000 |
| 8mm | 1/4 | __ | __ | 316 Stainless Steel | __ | 345 psi @ 72° F | 00000000 | 00000 |
Metric Threads | ||||||||
| 1/4" | __ | M5 | 0.8 | 316 Stainless Steel | Viton® Fluoroelastomer Rubber | 345 psi @ 72° F | 00000000 | 00000 |
| 1/4" | __ | M7 | 1 | 316 Stainless Steel | Viton® Fluoroelastomer Rubber | 345 psi @ 72° F | 00000000 | 00000 |
| 1/4" | __ | M10 | 1 | 316 Stainless Steel | Viton® Fluoroelastomer Rubber | 345 psi @ 72° F | 00000000 | 00000 |
| 4mm | __ | M3 | 0.5 | 316 Stainless Steel | Viton® Fluoroelastomer Rubber | 345 psi @ 72° F | 0000000 | 00000 |
| 4mm | __ | M5 | 0.8 | 316 Stainless Steel | Viton® Fluoroelastomer Rubber | 345 psi @ 72° F | 00000000 | 00000 |
| 6mm | __ | M5 | 0.8 | 316 Stainless Steel | Viton® Fluoroelastomer Rubber | 345 psi @ 72° F | 00000000 | 00000 |
| 6mm | __ | M10 | 1 | 316 Stainless Steel | Viton® Fluoroelastomer Rubber | 345 psi @ 72° F | 00000000 | 00000 |
| 10mm | __ | M10 | 1 | 316 Stainless Steel | Viton® Fluoroelastomer Rubber | 345 psi @ 72° F | 00000000 | 000000 |
UN/UNF (SAE Straight) Threads | ||||||||
| 1/4" | __ | 10-32 | __ | 316 Stainless Steel | Viton® Fluoroelastomer Rubber | 345 psi @ 72° F | 00000000 | 00000 |
| 4mm | __ | 10-32 | __ | 316 Stainless Steel | Viton® Fluoroelastomer Rubber | 345 psi @ 72° F | 0000000 | 00000 |
| 6mm | __ | 10-32 | __ | 316 Stainless Steel | Viton® Fluoroelastomer Rubber | 345 psi @ 72° F | 00000000 | 00000 |
| For Tube OD | Material | Max. Pressure | Each | |
| 1/4" | 316 Stainless Steel | 345 psi @ 72° F | 00000000 | 000000 |
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.
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 plugs insert into tubing and secure with a clamp.
Open Flow | With Shut-Off | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Coupling Size | Plug OD | For Tube ID | Material | Color | Max. Pressure | Each | Each | ||
| 1/8 | 5/16" | 1/8" | Polypropylene Plastic | Beige | 120 psi @ 72° F | 00000000 | 000000 | 00000000 | 000000 |
| 1/8 | 5/16" | 1/4" | Polypropylene Plastic | Beige | 120 psi @ 72° F | 00000000 | 00000 | 00000000 | 00000 |
| 1/4 | 7/16" | 1/4" | Polypropylene Plastic | Beige | 120 psi @ 72° F | 00000000 | 00000 | 00000000 | 00000 |
| 1/4 | 7/16" | 3/8" | Polypropylene Plastic | Beige | 120 psi @ 72° F | 00000000 | 00000 | 00000000 | 00000 |
| 3/8 | 3/4" | 3/8" | Polypropylene Plastic | Gray | 60 psi @ 72° F | 00000000 | 00000 | 00000000 | 00000 |
| 3/8 | 3/4" | 1/2" | Polypropylene Plastic | Gray | 60 psi @ 72° F | 00000000 | 00000 | 00000000 | 00000 |