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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Luer Lock Couplings for Stainless Steel Tubing
- For Use With: Air
- Temperature Range: 32° to 350° F
- Tubing: Use with 304/304L or 316/316L stainless steel
Quickly connect low-pressure stainless steel lines with these couplings. Made of 316 stainless steel, they have excellent corrosion resistance. They’re easier to install than yor-lok or compression couplings—just insert tubing and twist the nut to seal—but they can’t handle as much pressure. 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 are open-flow style, so there is no shut-off valve to stop the flow when the coupling is separated. They have a compact body for installation in tight spaces.
Note: For a complete coupling, order a plug and a socket.
For technical drawings and 3-D models, click on a part number.
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.
Plastic Luer Lock Tube Couplings for Air and Water
- For Use With: Nylon Plastic: Air, Water
Polycarbonate Plastic: Air
Polypropylene Plastic: Water - Temperature Range: See table
- Tubing: Use with soft (Durometer 40A-65A) PVC plastic or silicone rubber
Made of plastic, these couplings are lighter in weight than metal luer lock couplings. They're a popular choice in labs because of their versatility—they fit any other luer lock plug, socket, syringe, or needle. Quick to attach and detach, they’re often used in lines that are frequently disconnected. They have a compact body for easy installation in tight spaces. Use them in low-pressure applications. These couplings are open-flow style, so there is no shut-off valve to stop the flow when they’re separated.
Nylon couplings have excellent impact and abrasion resistance. They’re for general purpose applications. Polypropylene couplings won’t absorb water and lose strength, even in high-humidity environments. They also stand up to chemicals, including solvents.
Plugs with a locking ring are more secure than those without a locking ring. Give the ring a half turn to lock these couplings in place. You can’t remove the locking ring.
Note: For a complete coupling, order a plug and a socket.
For technical drawings and 3-D models, click on a part number.
| Color | Clarity | Max. Pressure | Temp. Range, °F | Locking Ring Included | Pkg. Qty. | Pkg. | |
Nylon Plastic  | |||||||
|---|---|---|---|---|---|---|---|
Open Tip | |||||||
| White | Opaque | 40 psi @ 72° F | -20° to 200° F | With Locking Ring | 10 | 000000000 | 00000 |
Polycarbonate Plastic | |||||||
Open Tip | |||||||
| Clear | Clear | 40 psi @ 72° F | -20° to 200° F | With Locking Ring | 10 | 000000000 | 0000 |
Polypropylene Plastic | |||||||
Open Tip | |||||||
| White | Semi-Clear | 40 psi @ 72° F | 35° to 150° F | With Locking Ring | 10 | 000000000 | 0000 |