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.
More
Aluminum Quick-Connect Pipe Fittings for Compressed Air
Twist these fittings onto aluminum pipe for quick, sealed connections—no threading, soldering, or welding necessary. Use them to build a compressed air system in half the time it would take to build a copper or steel system. Also known as Unipipe fittings, they’re part of a quick-connect system that’s compatible with pipe from Unipipe, Transair, and Infinity.
Finger tighten the collar on the end of these fittings, then use a wrench for the final quarter turn. The inside of these fittings has a compression ring and O-ring to seal against the pipe. They’re easy to take apart as needed to modify your setup.
Choose fittings with a blue or gray collar for easy identification. Fittings with a blue collar are often used for compressed air systems. Fittings with a gray collar are often used for vacuum systems.
For technical drawings and 3-D models, click on a part number.
- For Use With: Air, Coolant, Nitrogen, Oil
- Temperature Range: 0° to 210° F
- Specifications Met: ASME B31.1, ASME B31.3, ASME B31.9
- Pipe Nipples and Pipe: Use Quick-Disconnect Aluminum
| For Pipe OD | Socket Dp., mm | Material | Color | Max. Pressure | Each | |
Blue Collar | ||||||
|---|---|---|---|---|---|---|
| 3/4" (20 mm) | 35 | Epoxy-Coated 6061 Aluminum | Black | 230 psi @ 72° F | 0000000 | 000000 |
| 1" (25 mm) | 37 | Epoxy-Coated 6061 Aluminum | Black | 230 psi @ 72° F | 0000000 | 00000 |
| 1 1/2" (40 mm) | 57 | Epoxy-Coated 6061 Aluminum | Black | 230 psi @ 72° F | 0000000 | 00000 |
Gray Collar | ||||||
| 3/4" (20 mm) | 35 | Epoxy-Coated 6061 Aluminum | Black | 230 psi @ 72° F | 0000000 | 00000 |
| 1" (25 mm) | 37 | Epoxy-Coated 6061 Aluminum | Black | 230 psi @ 72° F | 0000000 | 00000 |
| 1 1/2" (40 mm) | 57 | Epoxy-Coated 6061 Aluminum | Black | 230 psi @ 72° F | 0000000 | 00000 |
- For Use With: Air, Coolant, Nitrogen, Oil
- Temperature Range: 0° to 210° F
- Specifications Met: ASME B31.1, ASME B31.3, ASME B31.9
- Pipe Nipples and Pipe: Use Quick-Disconnect Aluminum
Threaded connections can be taken apart as needed for maintenance and repair.
- For Use With: Air, Coolant, Nitrogen, Oil
- Temperature Range: 0° to 210° F
- Specifications Met: ASME B31.1, ASME B31.3, ASME B31.9
Threaded connections can be taken apart as needed for maintenance and repair.
(A) | |||||||
|---|---|---|---|---|---|---|---|
| For Pipe OD | Socket Dp., mm | Pipe Size (B)  | Material | Color | Max. Pressure | Each | |
Blue Collar | |||||||
NPT Threads | |||||||
| 3/4" (20 mm) | 35 | 1/2 | Epoxy-Coated 6061 Aluminum | Black | 230 psi @ 72° F | 0000000 | 000000 |
| 1" (25 mm) | 37 | 1/2 | Epoxy-Coated 6061 Aluminum | Black | 230 psi @ 72° F | 0000000 | 00000 |
| 1" (25 mm) | 37 | 3/4 | Epoxy-Coated 6061 Aluminum | Black | 230 psi @ 72° F | 0000000 | 00000 |
| 1 1/2" (40 mm) | 57 | 1 1/4 | Epoxy-Coated 6061 Aluminum | Black | 230 psi @ 72° F | 0000000 | 00000 |
| 1 1/2" (40 mm) | 57 | 2 | Epoxy-Coated 6061 Aluminum | Black | 230 psi @ 72° F | 0000000 | 00000 |
Gray Collar | |||||||
NPT Threads | |||||||
| 3/4" (20 mm) | 35 | 1/2 | Epoxy-Coated 6061 Aluminum | Black | 230 psi @ 72° F | 00000000 | 00000 |
| 1" (25 mm) | 37 | 1/2 | Epoxy-Coated 6061 Aluminum | Black | 230 psi @ 72° F | 00000000 | 00000 |
| 1" (25 mm) | 37 | 3/4 | Epoxy-Coated 6061 Aluminum | Black | 230 psi @ 72° F | 00000000 | 00000 |
| 1 1/2" (40 mm) | 57 | 1 1/4 | Epoxy-Coated 6061 Aluminum | Black | 230 psi @ 72° F | 00000000 | 00000 |
| 1 1/2" (40 mm) | 57 | 2 | Epoxy-Coated 6061 Aluminum | Black | 230 psi @ 72° F | 00000000 | 00000 |
- For Use With: Air, Coolant, Nitrogen, Oil
- Temperature Range: 0° to 210° F
- Specifications Met: ASME B31.1, ASME B31.3, ASME B31.9
- Pipe Nipples and Pipe: Use Quick-Disconnect Aluminum
| For Pipe OD | Socket Dp., mm | Material | Color | Max. Pressure | Each | |
Blue Collar | ||||||
|---|---|---|---|---|---|---|
| 3/4" (20 mm) | 35 | Epoxy-Coated 6061 Aluminum | Black | 230 psi @ 72° F | 0000000 | 000000 |
| 1" (25 mm) | 37 | Epoxy-Coated 6061 Aluminum | Black | 230 psi @ 72° F | 0000000 | 00000 |
| 1 1/2" (40 mm) | 57 | Epoxy-Coated 6061 Aluminum | Black | 230 psi @ 72° F | 0000000 | 00000 |
Gray Collar | ||||||
| 3/4" (20 mm) | 35 | Epoxy-Coated 6061 Aluminum | Black | 230 psi @ 72° F | 0000000 | 00000 |
| 1" (25 mm) | 37 | Epoxy-Coated 6061 Aluminum | Black | 230 psi @ 72° F | 0000000 | 00000 |
| 1 1/2" (40 mm) | 57 | Epoxy-Coated 6061 Aluminum | Black | 230 psi @ 72° F | 0000000 | 00000 |
Use measuring tools to mark your pipe’s proper insertion depth so you know if it’s inserted far enough into the fitting.
| Max. Dp. Measured, mm | Lg., mm | Wd., mm | Material | Each | |
| 160 | 224 | 39 | Plastic | 0000000 | 000000 |
Plastic Quick-Disconnect Tube Couplings for Air and Water
Lighter in weight than their metal counterparts, these quick-disconnect couplings are plastic. They consist of a plug and a socket that allow you to frequently connect and disconnect your line.
Acetal plugs and sockets are moisture resistant, so they won’t absorb water and lose strength, even in high-humidity environments. 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.
- Temperature Range: -40° to 180° F
- Tubing: Use with nylon plastic or polyethylene plastic
Open Flow | ||||||||
|---|---|---|---|---|---|---|---|---|
| Coupling Size | Plug OD | For Tube ID, mm | For Tube OD | Material | Color | Max. Pressure | Each | |
| 1/8 | 5/16" | 2.5 | 4mm | Acetal Plastic | White | 100 psi @ 72° F | 00000000 | 00000 |
Quick-Disconnect Tube Couplings for Food and Beverage
- Temperature Range:
Acetal Plastic: -40° to 180° F
Polypropylene Plastic: 32° to 160° F - Tubing:
Barbed Fittings: Use with soft or firm (Durometer 65A-80A) polyurethane rubber
Compression Fittings: Use with hard or firm (Durometer 80A-60D) nylon or polyethylene plastic - Specifications Met: NSF/ANSI 169
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. They’re made of FDA-approved materials, including moisture-resistant plastic that won’t absorb liquid and lose strength, even in high-humidity food and beverage applications.
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.
| Coupling Size | Plug OD | For Tube ID | Material | Color | Clarity | Max. Pressure | Each | |
Open Flow | ||||||||
|---|---|---|---|---|---|---|---|---|
| 1/4 | 7/16" | 1/4" | Acetal Plastic | White | Semi-Clear | 100 psi @ 72° F | 0000000 | 00000 |
| 1/4 | 7/16" | 3/8" | Acetal Plastic | White | Semi-Clear | 100 psi @ 72° F | 0000000 | 0000 |
With Shut-Off | ||||||||
| 1/4 | 7/16" | 1/4" | Acetal Plastic | White | Semi-Clear | 100 psi @ 72° F | 0000000 | 00000 |
| 1/4 | 7/16" | 3/8" | Acetal Plastic | White | Semi-Clear | 100 psi @ 72° F | 0000000 | 00000 |
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 |
Quick-Disconnect Hose Couplings for Coolant
Also known as coolant-line mold couplings, these couplings are often used to install and remove coolant lines in molding and die casting applications. A complete coupling consists of a plug and a socket (both sold separately) that connect and disconnect quickly. Use them when you need frequent access to a line. All of the quick-disconnect coolant plugs are compatible with any of the quick-disconnect coolant sockets of the same coupling size, regardless of the pipe size or barbed hose ID.
Open-flow plugs and sockets do not have a shut-off valve, so the couplings allow for maximum flow. Sockets are sleeve-lock style. To connect, slide back the sleeve on the socket, insert the plug, and release the sleeve. To disconnect, slide back the sleeve and pull out the plug.
Sockets with a barbed end insert into plastic or rubber hose and secure with a clamp.
Brass plugs and sockets have better corrosion resistance than zinc-plated steel, and are softer, so they’re easier to thread together.
Note: To ensure a correct fit, make sure that the plug and socket have the same coupling size.
Warning: For open-flow plugs and sockets, stop the flow of coolant before you disconnect the line.
For technical drawings and 3-D models, click on a part number.
- Maximum Pressure: 200 psi @ 72° F
- Temperature Range: -30° to 400° F
- Attachment Type: Use Worm-Drive Clamps or Band-and-Buckle Clamps
- Compatible With: Hansen FT
- Maximum Pressure: 200 psi @ 72° F
- Temperature Range: -30° to 400° F
- Attachment Type: Use Worm-Drive Clamps or Band-and-Buckle Clamps
- Compatible With: Foster FP, Foster FS, Hansen FT, Parker Moldmate