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
Brass Luer Lock Tube Couplings for Air

Quickly connect low-pressure air lines with these luer lock couplings. Made of brass, they are stronger and more durable than plastic tube couplings. These couplings have a nickel plating for extra protection against corrosive environments. Luer lock connections are universal, so you can connect any plug and socket to each other, regardless of the pipe or tube size. You can also connect them to syringes and needles. These couplings have a compact body, so they’re easy to fit in tight spaces. All are open-flow style, so there is no shut-off valve to stop the flow when the coupling is separated.
Note: For a complete coupling, order a plug and a socket.
For technical drawings and 3-D models, click on a part number.

- Temperature Range: -100° to 300° F
- Tubing: Use with soft or firm (Durometer 35A-95A) polyurethane rubber, PVC plastic or silicone rubber
Barbed plugs and sockets insert into tubing and secure with a clamp.

- Temperature Range: -100° to 300° F
Pipe Size | Thread Size | Thread Pitch, mm | Material | Max. Pressure | Features | Each | |
NPT Threads | |||||||
---|---|---|---|---|---|---|---|
1/16 | __ | __ | Nickel-Plated Brass | 30 psi @ 72° F | __ | 00000000 | 000000 |
1/8 | __ | __ | Nickel-Plated Brass | 30 psi @ 72° F | __ | 000000000 | 0000 |
1/4 | __ | __ | Nickel-Plated Brass | 30 psi @ 72° F | __ | 000000000 | 0000 |
Metric Threads | |||||||
__ | M5 | 0.8 | Nickel-Plated Brass | 30 psi @ 72° F | Acrylic Thread Sealant | 00000000 | 00000 |
__ | M6 | 1 | Nickel-Plated Brass | 30 psi @ 72° F | Acrylic Thread Sealant | 00000000 | 00000 |
__ | M8 | 1 | Nickel-Plated Brass | 30 psi @ 72° F | Acrylic Thread Sealant | 00000000 | 00000 |
UN/UNF (SAE Straight) Threads | |||||||
__ | 10-32 | __ | Nickel-Plated Brass | 30 psi @ 72° F | __ | 000000000 | 0000 |
__ | 1/4"-28 | __ | Nickel-Plated Brass | 30 psi @ 72° F | __ | 00000000 | 0000 |

- Temperature Range: -100° to 300° F
Pipe Size | Thread Size | Material | Max. Pressure | Each | |
NPT Threads | |||||
---|---|---|---|---|---|
1/16 | __ | Nickel-Plated Brass | 30 psi @ 72° F | 00000000 | 000000 |
1/8 | __ | Nickel-Plated Brass | 30 psi @ 72° F | 00000000 | 00000 |
1/4 | __ | Nickel-Plated Brass | 30 psi @ 72° F | 00000000 | 00000 |
UN/UNF (SAE Straight) Threads | |||||
__ | 10-32 | Nickel-Plated Brass | 30 psi @ 72° F | 00000000 | 0000 |
__ | 1/4"-28 | Nickel-Plated Brass | 30 psi @ 72° F | 00000000 | 0000 |

- Temperature Range: -100° to 300° F
- Tubing: Use with soft or firm (Durometer 35A-95A) polyurethane rubber, PVC plastic or silicone rubber
Material | Max. Pressure | Each | |
Nickel-Plated Brass | 30 psi @ 72° F | 000000000 | 00000 |

- Temperature Range: -100° to 300° F
- Tubing: Use with soft or firm (Durometer 35A-95A) polyurethane rubber, PVC plastic or silicone rubber
Barbed plugs and sockets insert into tubing and secure with a clamp.

- Temperature Range: -100° to 300° F
Pipe Size | Thread Size | Thread Pitch, mm | Material | Max. Pressure | Features | Each | |
NPT Threads | |||||||
---|---|---|---|---|---|---|---|
1/16 | __ | __ | Nickel-Plated Brass | 30 psi @ 72° F | __ | 00000000 | 000000 |
1/8 | __ | __ | Nickel-Plated Brass | 30 psi @ 72° F | __ | 00000000 | 00000 |
1/4 | __ | __ | Nickel-Plated Brass | 30 psi @ 72° F | __ | 00000000 | 00000 |
Metric Threads | |||||||
__ | M5 | 0.8 | Nickel-Plated Brass | 30 psi @ 72° F | Acrylic Thread Sealant | 00000000 | 00000 |
__ | M6 | 1 | Nickel-Plated Brass | 30 psi @ 72° F | Acrylic Thread Sealant | 00000000 | 00000 |
__ | M8 | 1 | Nickel-Plated Brass | 30 psi @ 72° F | Acrylic Thread Sealant | 00000000 | 00000 |
UN/UNF (SAE Straight) Threads | |||||||
__ | 10-32 | __ | Nickel-Plated Brass | 30 psi @ 72° F | __ | 000000000 | 0000 |
__ | 1/4"-28 | __ | Nickel-Plated Brass | 30 psi @ 72° F | __ | 00000000 | 0000 |

- Temperature Range: -100° to 300° F
Thread Size | Pipe Size | Material | Max. Pressure | Each | |
NPT Threads | |||||
---|---|---|---|---|---|
__ | 1/16 | Nickel-Plated Brass | 30 psi @ 72° F | 00000000 | 000000 |
__ | 1/8 | Nickel-Plated Brass | 30 psi @ 72° F | 00000000 | 00000 |
__ | 1/4 | Nickel-Plated Brass | 30 psi @ 72° F | 00000000 | 00000 |
UN/UNF (SAE Straight) Threads | |||||
10-32 | __ | Nickel-Plated Brass | 30 psi @ 72° F | 00000000 | 00000 |
1/4"-28 | __ | Nickel-Plated Brass | 30 psi @ 72° F | 00000000 | 00000 |

- Temperature Range: -100° to 300° F
- Tubing: Use with soft or firm (Durometer 35A-95A) polyurethane rubber, PVC plastic or silicone rubber
Material | Max. Pressure | Each | |
Nickel-Plated Brass | 30 psi @ 72° F | 000000000 | 00000 |

- Temperature Range: -100° to 300° F
Material | Max. Pressure | Each | |
Nickel-Plated Brass | 30 psi @ 72° F | 000000000 | 00000 |

- Temperature Range: -100° to 300° F
Material | Max. Pressure | Each | |
Nickel-Plated Brass | 30 psi @ 72° F | 000000000 | 00000 |