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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Color-Coded Identification Rings for Push-to-Connect Tube Fittings for Air
Color-code your lines by snapping these rings over the release ring on push-to-connect fittings.
For technical drawings and 3-D models, click on a part number.
| For Tube OD | Material | Choose a Color | Each | |
| 1/8" | Nylon Plastic | Yellow | 00000000 | 00000 |
| 5/32" | Nylon Plastic | 00000000 | 000 | |
| 3/16" | Nylon Plastic | 00000000 | 000 | |
| 1/4" | Nylon Plastic | 00000000 | 000 | |
| 5/16" | Nylon Plastic | 00000000 | 000 | |
| 3/8" | Nylon Plastic | 00000000 | 000 | |
| 1/2" | Nylon Plastic | Yellow | 00000000 | 000 |
| 6mm | Nylon Plastic | 00000000 | 000 | |
| 10mm | Nylon Plastic | 00000000 | 0000 | |
| 12mm | Nylon Plastic | 00000000 | 0000 |
Color-Coded Identification Rings for Low-Temperature
D.O.T. Push-to-Connect Tube Fittings for Air
Color-code your lines by snapping one of these rings over the release ring on low-temperature D.O.T. push-to-connect tube fittings. Often used in air brake lines for commercial trucks and trailers, they meet Department of Transportation FMVSS 571 safety standards.
For technical drawings and 3-D models, click on a part number.
Aluminum Low-Pressure Barbed Tube Fittings for Air and Water
- For Use With: Air, Lubricated Air, Water
- Temperature Range: -40° to 230° F
- Tubing: Use with hard (Durometer 75A-60D) EVA plastic, polyethylene plastic, polyurethane rubber or PVDF plastic
Made of aluminum, these fittings are lighter in weight than other metal barbed tube fittings and have good corrosion resistance. The barb grips onto tubing, providing a secure hold with no clamp required.
Metric, BSPP, and UN/UNF (SAE Straight) male threads have a gasket or O-ring for a tight seal. 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 ID | Pipe Size | Thread Size | Thread Pitch, mm | Material | Gasket Material | Max. Pressure | Each | |
NPT Threads | ||||||||
|---|---|---|---|---|---|---|---|---|
| 1/16" | 1/16 | __ | __ | Aluminum | __ | 125 psi @ 72° F | 00000000 | 00000 |
| 1/16" | 1/4 | __ | __ | Aluminum | __ | 125 psi @ 72° F | 00000000 | 0000 |
| 1/8" | 1/8 | __ | __ | Aluminum | __ | 125 psi @ 72° F | 00000000 | 0000 |
| 1/8" | 1/4 | __ | __ | Aluminum | __ | 125 psi @ 72° F | 00000000 | 0000 |
| 0.17" | 1/4 | __ | __ | Aluminum | __ | 125 psi @ 72° F | 00000000 | 0000 |
| 1/4" | 1/8 | __ | __ | Aluminum | __ | 125 psi @ 72° F | 00000000 | 0000 |
| 1/4" | 1/4 | __ | __ | Aluminum | __ | 125 psi @ 72° F | 00000000 | 0000 |
| 3/8" | 1/4 | __ | __ | Aluminum | __ | 125 psi @ 72° F | 00000000 | 0000 |
| 1/2" | 1/4 | __ | __ | Aluminum | __ | 125 psi @ 72° F | 00000000 | 0000 |
Metric Threads | ||||||||
| 1/16" | __ | M5 | 0.8 | Aluminum | Fiber | 125 psi @ 72° F | 00000000 | 0000 |
| 1/8" | __ | M5 | 0.8 | Aluminum | Fiber | 125 psi @ 72° F | 00000000 | 0000 |
| 1/8" | __ | M6 | 1 | Aluminum | Fiber | 125 psi @ 72° F | 00000000 | 0000 |
| 1/4" | __ | M5 | 0.8 | Aluminum | Fiber | 125 psi @ 72° F | 00000000 | 0000 |
| 1/4" | __ | M6 | 1 | Aluminum | Fiber | 125 psi @ 72° F | 00000000 | 0000 |
| 1/4" | __ | M8 | 1 | Aluminum | Fiber | 125 psi @ 72° F | 00000000 | 0000 |
UN/UNF (SAE Straight) Threads | ||||||||
| 1/16" | __ | 10-32 | __ | Aluminum | Fiber | 125 psi @ 72° F | 00000000 | 0000 |
| 1/16" | __ | 1/4"-28 | __ | Aluminum | Fiber | 125 psi @ 72° F | 00000000 | 0000 |
| 1/8" | __ | 10-32 | __ | Aluminum | Fiber | 125 psi @ 72° F | 00000000 | 0000 |
| 1/8" | __ | 1/4"-28 | __ | Aluminum | Fiber | 125 psi @ 72° F | 00000000 | 0000 |
| 0.17" | __ | 10-32 | __ | Aluminum | Fiber | 125 psi @ 72° F | 00000000 | 0000 |
| 0.17" | __ | 1/4"-28 | __ | Aluminum | Fiber | 125 psi @ 72° F | 00000000 | 0000 |
| 1/4" | __ | 10-32 | __ | Aluminum | Fiber | 125 psi @ 72° F | 00000000 | 0000 |
| 1/4" | __ | 1/4"-28 | __ | Aluminum | Fiber | 125 psi @ 72° F | 00000000 | 0000 |
| For Tube ID (A) | For Tube ID (B) | Material | Max. Pressure | Each | |
| 1/8" | 1/16" | Aluminum | 125 psi @ 72° F | 00000000 | 00000 |
| 0.17" | 1/8" | Aluminum | 125 psi @ 72° F | 00000000 | 0000 |
| 1/4" | 1/16" | Aluminum | 125 psi @ 72° F | 00000000 | 0000 |
| 1/4" | 1/8" | Aluminum | 125 psi @ 72° F | 00000000 | 0000 |
| 1/4" | 0.17" | Aluminum | 125 psi @ 72° F | 00000000 | 0000 |
| 3/8" | 1/4" | Aluminum | 125 psi @ 72° F | 00000000 | 0000 |
| 1/2" | 1/4" | Aluminum | 125 psi @ 72° F | 00000000 | 00000 |
Choose-a-Color Aluminum Low-Pressure Barbed Tube Fittings for Air and Water
- For Use With: Air, Lubricated Air, Water
- Temperature Range: -40° to 230° F
- Tubing: Use with hard (Durometer 75A-60D) EVA plastic, polyethylene plastic, polyurethane rubber or PVDF plastic
Color-code fittings for easy identification. Fittings are aluminum, which is lightweight with good corrosion resistance. The barb grips onto tubing, providing a secure hold with no clamp required.
Metric and UN/UNF (SAE Straight) male threads have a gasket for a tight seal. 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 ID | Pipe Size | Thread Size | Thread Pitch, mm | Material | Gasket Material | Max. Pressure | Choose a Color | Each | |
NPT Threads | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| 1/16" | 1/16 | __ | __ | Anodized Aluminum | __ | 125 psi @ 72° F | 00000000 | 00000 | |
| 1/16" | 1/4 | __ | __ | Anodized Aluminum | __ | 125 psi @ 72° F | 00000000 | 0000 | |
| 1/8" | 1/8 | __ | __ | Anodized Aluminum | __ | 125 psi @ 72° F | 00000000 | 0000 | |
| 1/8" | 1/4 | __ | __ | Anodized Aluminum | __ | 125 psi @ 72° F | 00000000 | 0000 | |
| 0.17" | 1/4 | __ | __ | Anodized Aluminum | __ | 125 psi @ 72° F | 00000000 | 0000 | |
| 1/4" | 1/8 | __ | __ | Anodized Aluminum | __ | 125 psi @ 72° F | 00000000 | 0000 | |
| 1/4" | 1/4 | __ | __ | Anodized Aluminum | __ | 125 psi @ 72° F | 00000000 | 0000 | |
| 3/8" | 1/4 | __ | __ | Anodized Aluminum | __ | 125 psi @ 72° F | 00000000 | 0000 | |
| 1/2" | 1/4 | __ | __ | Anodized Aluminum | __ | 125 psi @ 72° F | 00000000 | 0000 | |
| 4mm | 1/8 | __ | __ | Anodized Aluminum | __ | 125 psi @ 72° F | 00000000 | 0000 | |
| 8mm | 1/16 | __ | __ | Anodized Aluminum | __ | 125 psi @ 72° F | 00000000 | 0000 | |
Metric Threads | |||||||||
| 1/16" | __ | M5 | 0.8 | Anodized Aluminum | Fiber | 125 psi @ 72° F | 00000000 | 0000 | |
| 1/8" | __ | M5 | 0.8 | Anodized Aluminum | Fiber | 125 psi @ 72° F | 00000000 | 0000 | |
| 1/8" | __ | M6 | 1 | Anodized Aluminum | Fiber | 125 psi @ 72° F | 00000000 | 0000 | |
| 1/4" | __ | M5 | 0.8 | Anodized Aluminum | Fiber | 125 psi @ 72° F | 00000000 | 0000 | |
| 1/4" | __ | M6 | 1 | Anodized Aluminum | Fiber | 125 psi @ 72° F | 00000000 | 0000 | |
| 1/4" | __ | M8 | 1 | Anodized Aluminum | Fiber | 125 psi @ 72° F | 00000000 | 0000 | |
| 2mm | __ | M3 | 0.5 | Anodized Aluminum | Fiber | 125 psi @ 72° F | 00000000 | 00000 | |
| 4mm | __ | M5 | 0.8 | Anodized Aluminum | Fiber | 125 psi @ 72° F | 00000000 | 00000 | |
UN/UNF (SAE Straight) Threads | |||||||||
| 1/16" | __ | 10-32 | __ | Anodized Aluminum | Fiber | 125 psi @ 72° F | 00000000 | 0000 | |
| 1/16" | __ | 1/4"-28 | __ | Anodized Aluminum | Fiber | 125 psi @ 72° F | 00000000 | 0000 | |
| 1/8" | __ | 10-32 | __ | Anodized Aluminum | Fiber | 125 psi @ 72° F | 00000000 | 0000 | |
| 1/8" | __ | 1/4"-28 | __ | Anodized Aluminum | Fiber | 125 psi @ 72° F | 00000000 | 0000 | |
| 0.17" | __ | 10-32 | __ | Anodized Aluminum | Fiber | 125 psi @ 72° F | 00000000 | 0000 | |
| 0.17" | __ | 1/4"-28 | __ | Anodized Aluminum | Fiber | 125 psi @ 72° F | 00000000 | 0000 | |
| 1/4" | __ | 10-32 | __ | Anodized Aluminum | Fiber | 125 psi @ 72° F | 00000000 | 0000 | |
| 1/4" | __ | 1/4"-28 | __ | Anodized Aluminum | Fiber | 125 psi @ 72° F | 00000000 | 0000 | |
| For Tube ID | Pipe Size | Material | Max. Pressure | Choose a Color | Each | |
NPT Threads | ||||||
|---|---|---|---|---|---|---|
| 1/8" | 1/8 | Anodized Aluminum | 125 psi @ 72° F | 00000000 | 000000 | |
| 1/8" | 1/4 | Anodized Aluminum | 125 psi @ 72° F | 00000000 | 00000 | |
| 1/4" | 1/8 | Anodized Aluminum | 125 psi @ 72° F | 00000000 | 00000 | |
| 1/4" | 1/4 | Anodized Aluminum | 125 psi @ 72° F | 00000000 | 00000 | |
| 3/8" | 1/4 | Anodized Aluminum | 125 psi @ 72° F | 00000000 | 00000 | |
| 2mm | 1/8 | Anodized Aluminum | 125 psi @ 72° F | 00000000 | 00000 | |
| 6mm | 1/4 | Anodized Aluminum | 125 psi @ 72° F | 00000000 | 00000 | |
| For Tube ID | Material | Max. Pressure | Choose a Color | Each | |
| 1/16" | Anodized Aluminum | 125 psi @ 72° F | 00000000 | 00000 | |
| 1/8" | Anodized Aluminum | 125 psi @ 72° F | 00000000 | 0000 | |
| 0.17" | Anodized Aluminum | 125 psi @ 72° F | 00000000 | 0000 | |
| 1/4" | Anodized Aluminum | 125 psi @ 72° F | 00000000 | 0000 | |
| 3/8" | Anodized Aluminum | 125 psi @ 72° F | 00000000 | 0000 | |
| 1/2" | Anodized Aluminum | 125 psi @ 72° F | 00000000 | 0000 |
| For Tube ID (A) | For Tube ID (B) | Material | Max. Pressure | Choose a Color | Each | |
| 1/8" | 1/16" | Anodized Aluminum | 125 psi @ 72° F | 00000000 | 00000 | |
| 0.17" | 1/8" | Anodized Aluminum | 125 psi @ 72° F | 00000000 | 0000 | |
| 1/4" | 1/16" | Anodized Aluminum | 125 psi @ 72° F | 00000000 | 0000 | |
| 1/4" | 1/8" | Anodized Aluminum | 125 psi @ 72° F | 00000000 | 0000 | |
| 1/4" | 0.17" | Anodized Aluminum | 125 psi @ 72° F | 00000000 | 0000 | |
| 3/8" | 1/4" | Anodized Aluminum | 125 psi @ 72° F | 00000000 | 0000 | |
| 1/2" | 1/4" | Anodized Aluminum | 125 psi @ 72° F | 00000000 | 00000 |
| For Tube ID | Material | Max. Pressure | Choose a Color | Each | |
| 1/16" | Anodized Aluminum | 125 psi @ 72° F | 00000000 | 00000 | |
| 1/8" | Anodized Aluminum | 125 psi @ 72° F | 00000000 | 0000 | |
| 0.17" | Anodized Aluminum | 125 psi @ 72° F | 00000000 | 0000 | |
| 1/4" | Anodized Aluminum | 125 psi @ 72° F | 00000000 | 00000 | |
| 3/8" | Anodized Aluminum | 125 psi @ 72° F | 00000000 | 00000 | |
| 1/2" | Anodized Aluminum | 125 psi @ 72° F | 00000000 | 00000 |
| For Tube ID | Material | Max. Pressure | Choose a Color | Each | |
| 1/16" | Anodized Aluminum | 125 psi @ 72° F | 00000000 | 00000 | |
| 1/8" | Anodized Aluminum | 125 psi @ 72° F | 00000000 | 0000 | |
| 0.17" | Anodized Aluminum | 125 psi @ 72° F | 00000000 | 0000 | |
| 1/4" | Anodized Aluminum | 125 psi @ 72° F | 00000000 | 00000 | |
| 3/8" | Anodized Aluminum | 125 psi @ 72° F | 00000000 | 00000 | |
| 1/2" | Anodized Aluminum | 125 psi @ 72° F | 00000000 | 00000 |
Color/Shape-Match Quick-Disconnect Hose Couplings for Air and Water
Couplings are color coded by shape so you can’t mix hose lines. Only plugs and sockets of the same color and coupling size will fit together. A complete coupling consists of a plug and a socket (both sold separately) that connect and disconnect quickly. Use them if you need frequent access to a line. Plugs and sockets are brass for good corrosion resistance.
Plugs are also known as nipples.
Sockets have a shut-off valve that stops the flow when the coupling is separated, so air or water won’t leak from the line. They are push-to-connect style. To connect, push the plug into the socket until you hear a click. To disconnect, slide the sleeve on the socket forward until the plug ejects.
Plugs and sockets with a barbed end insert into plastic or rubber hose and secure with a clamp or a crimp-on hose ferrule.
NPSF (National Pipe Straight Fuel) threads are compatible with NPT threads.
Note: To ensure a correct fit, make sure that the plug and socket have the same color and coupling size.
For technical drawings and 3-D models, click on a part number.
- Maximum Pressure: 500 psi @ 72° F
- Maximum Vacuum: 28 in. of Hg @ 72° F
- Temperature Range: 0° to 210° F
- Maximum Pressure: 500 psi @ 72° F
- Maximum Vacuum: 28 in. of Hg @ 72° F
- Temperature Range: 0° to 210° F
Plug Tip | ||||||||
|---|---|---|---|---|---|---|---|---|
| Coupling Size | Lg. | Dia. | Pipe Size | Thread Type | Band Material | Plug Shape | Each | |
Blue Band | ||||||||
303 Stainless Steel | ||||||||
| 1/4 | 11/16" | 7/16" | 1/4 | NPT | Polyolefin Plastic | Round | 00000000 | 000000 |
| 3/8 | 7/16" | 1/2" | 3/8 | NPT | Polyolefin Plastic | Round | 00000000 | 00000 |
Green Band | ||||||||
303 Stainless Steel | ||||||||
| 1/4 | 11/16" | 7/16" | 1/4 | NPT | Polyolefin Plastic | Round | 00000000 | 00000 |
| 3/8 | 7/16" | 1/2" | 3/8 | NPT | Polyolefin Plastic | Round | 00000000 | 00000 |
Brass | ||||||||
| 1/4 | 3/16" | 3/8" | 1/4 | NPSF | Anodized Aluminum | Round | 00000000 | 00000 |
| 1/4 | 3/16" | 3/8" | 3/8 | NPSF | Anodized Aluminum | Round | 00000000 | 00000 |
Red Band | ||||||||
303 Stainless Steel | ||||||||
| 1/4 | 11/16" | 7/16" | 1/4 | NPT | Polyolefin Plastic | Round | 00000000 | 00000 |
| 3/8 | 7/16" | 1/2" | 3/8 | NPT | Polyolefin Plastic | Round | 00000000 | 00000 |
- Maximum Pressure: 500 psi @ 72° F
- Maximum Vacuum: 28 in. of Hg @ 72° F
- Temperature Range: 0° to 210° F
- Attachment Type: Use Worm-Drive Clamps or Crimp-On Hose Ferrules
Plug Tip | Red Band | ||||||
|---|---|---|---|---|---|---|---|
| Coupling Size | Lg. | Dia. | For Hose ID | Band Material | Plug Shape | Each | |
Brass | |||||||
| 1/4 | 3/16" | 3/8" | 1/4" | Anodized Aluminum | Octagon | 00000000 | 000000 |
- Maximum Pressure: 500 psi @ 72° F
- Maximum Vacuum: 28 in. of Hg @ 72° F
- Temperature Range: 0° to 210° F
For Plug Tip | ||||||||
|---|---|---|---|---|---|---|---|---|
| Coupling Size | Lg. | Dia. | Pipe Size | Thread Type | Sleeve Material | For Plug Shape | Each | |
Blue Sleeve | ||||||||
Brass | ||||||||
| 1/4 | 3/16" | 3/8" | 1/4 | NPT | Anodized Aluminum | Hex | 00000000 | 000000 |
| 1/4 | 3/16" | 3/8" | 3/8 | NPT | Anodized Aluminum | Hex | 00000000 | 00000 |
Green Sleeve | ||||||||
Brass | ||||||||
| 1/4 | 3/16" | 3/8" | 1/4 | NPT | Anodized Aluminum | Round | 00000000 | 00000 |
| 1/4 | 3/16" | 3/8" | 3/8 | NPT | Anodized Aluminum | Round | 00000000 | 00000 |
Red Sleeve | ||||||||
Brass | ||||||||
| 1/4 | 3/16" | 3/8" | 1/4 | NPT | Anodized Aluminum | Octagon | 00000000 | 00000 |
| 1/4 | 3/16" | 3/8" | 3/8 | NPT | Anodized Aluminum | Octagon | 00000000 | 00000 |
- Maximum Pressure: 500 psi @ 72° F
- Maximum Vacuum: 28 in. of Hg @ 72° F
- Temperature Range: 0° to 210° F
For Plug Tip | ||||||||
|---|---|---|---|---|---|---|---|---|
| Coupling Size | Lg. | Dia. | Pipe Size | Thread Type | Sleeve Material | For Plug Shape | Each | |
Blue Sleeve | ||||||||
303 Stainless Steel | ||||||||
| 1/4 | 11/16" | 7/16" | 1/4 | NPT | Polyolefin Plastic | Round | 00000000 | 000000 |
| 3/8 | 11/16" | 1/2" | 3/8 | NPT | Polyolefin Plastic | Round | 00000000 | 00000 |
Brass | ||||||||
| 1/4 | 3/16" | 3/8" | 1/4 | NPSF | Anodized Aluminum | Hex | 00000000 | 00000 |
| 1/4 | 3/16" | 3/8" | 3/8 | NPSF | Anodized Aluminum | Hex | 00000000 | 00000 |
Green Sleeve | ||||||||
303 Stainless Steel | ||||||||
| 1/4 | 11/16" | 7/16" | 1/4 | NPT | Polyolefin Plastic | Round | 00000000 | 00000 |
| 3/8 | 11/16" | 1/2" | 3/8 | NPT | Polyolefin Plastic | Round | 00000000 | 00000 |
Brass | ||||||||
| 1/4 | 3/16" | 3/8" | 1/4 | NPSF | Anodized Aluminum | Round | 00000000 | 00000 |
| 1/4 | 3/16" | 3/8" | 3/8 | NPSF | Anodized Aluminum | Round | 00000000 | 00000 |
Red Sleeve | ||||||||
303 Stainless Steel | ||||||||
| 1/4 | 11/16" | 7/16" | 1/4 | NPT | Polyolefin Plastic | Round | 00000000 | 00000 |
| 3/8 | 11/16" | 1/2" | 3/8 | NPT | Polyolefin Plastic | Round | 00000000 | 00000 |
Brass | ||||||||
| 1/4 | 3/16" | 3/8" | 1/4 | NPSF | Anodized Aluminum | Octagon | 00000000 | 00000 |
| 1/4 | 3/16" | 3/8" | 3/8 | NPSF | Anodized Aluminum | Octagon | 00000000 | 00000 |
- Maximum Pressure: 500 psi @ 72° F
- Maximum Vacuum: 28 in. of Hg @ 72° F
- Temperature Range: 0° to 210° F
- Attachment Type: Use Worm-Drive Clamps or Crimp-On Hose Ferrules