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
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.
| Pipe Size  | Thread Size | Color | Clarity | Max. Pressure | Temp. Range, °F | Locking Ring Included | Pkg. Qty. | Pkg. | |
NPT Threads | |||||||||
|---|---|---|---|---|---|---|---|---|---|
Nylon Plastic | |||||||||
| 1/8 | __ | White | Opaque | 40 psi @ 72° F | -20° to 200° F | With Locking Ring | 10 | 000000000 | 000000 |
| 1/4 | __ | White | Opaque | 40 psi @ 72° F | -20° to 200° F | With Locking Ring | 10 | 000000000 | 00000 |
Polypropylene Plastic | |||||||||
| 1/8 | __ | White | Semi-Clear | 40 psi @ 72° F | 35° to 150° F | With Locking Ring | 10 | 000000000 | 00000 |
| 1/4 | __ | White | Semi-Clear | 40 psi @ 72° F | 35° to 150° F | With Locking Ring | 10 | 000000000 | 00000 |
UN/UNF (SAE Straight) Threads | |||||||||
Nylon Plastic | |||||||||
| __ | 1/4"-28 | White | Opaque | 40 psi @ 72° F | -20° to 200° F | With Locking Ring | 10 | 000000000 | 0000 |
Polypropylene Plastic | |||||||||
| __ | 1/4"-28 | White | Semi-Clear | 40 psi @ 72° F | 35° to 150° F | With Locking Ring | 10 | 000000000 | 00000 |
UN/UNF Taper Threads | |||||||||
Nylon Plastic | |||||||||
| __ | 10-32 | White | Opaque | 40 psi @ 72° F | -20° to 200° F | With Locking Ring | 10 | 000000000 | 0000 |
Polycarbonate Plastic | |||||||||
| __ | 10-32 | Clear | Clear | 40 psi @ 72° F | -20° to 200° F | With Locking Ring | 10 | 000000000 | 00000 |
Polypropylene Plastic | |||||||||
| __ | 10-32 | White | Semi-Clear | 40 psi @ 72° F | 35° to 150° F | With Locking Ring | 10 | 000000000 | 00000 |
| Pipe Size | Thread Size | Color | Clarity | Max. Pressure | Temp. Range, °F | Pkg. Qty. | Pkg. | |
NPT Threads | ||||||||
|---|---|---|---|---|---|---|---|---|
Nylon Plastic | ||||||||
| 1/8 | __ | White | Opaque | 40 psi @ 72° F | -20° to 200° F | 10 | 000000000 | 000000 |
Polypropylene Plastic | ||||||||
| 1/8 | __ | White | Semi-Clear | 40 psi @ 72° F | 35° to 150° F | 10 | 000000000 | 00000 |
UN/UNF (SAE Straight) Threads | ||||||||
Nylon Plastic | ||||||||
| __ | 10-32 | White | Opaque | 40 psi @ 72° F | -20° to 200° F | 10 | 000000000 | 0000 |
| __ | 1/4"-28 | White | Opaque | 40 psi @ 72° F | -20° to 200° F | 10 | 000000000 | 0000 |
Polycarbonate Plastic | ||||||||
| __ | 10-32 | Clear | Clear | 40 psi @ 72° F | -20° to 200° F | 10 | 000000000 | 00000 |
| __ | 1/4"-28 | Clear | Clear | 40 psi @ 72° F | -20° to 200° F | 10 | 000000000 | 00000 |
Polypropylene Plastic | ||||||||
| __ | 10-32 | White | Semi-Clear | 40 psi @ 72° F | 35° to 150° F | 10 | 000000000 | 00000 |
| __ | 1/4"-28 | White | Semi-Clear | 40 psi @ 72° F | 35° to 150° F | 10 | 000000000 | 0000 |
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.
- 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
| 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 |
Stainless Steel Luer Lock Tube Couplings for Air and Water
Use these luer lock couplings to quickly connect low-pressure air and water lines. Made of stainless steel, they’re more durable than plastic couplings. 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’ll 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.
303 stainless steel couplings have very good corrosion resistance.
316 stainless steel couplings have excellent corrosion resistance.
Note: For a complete coupling, order a plug and a socket.
- Temperature Range: 32° to 300° F
| Pipe Size | Thread Size | Max. Pressure | Each | |
NPT Threads | ||||
|---|---|---|---|---|
316 Stainless Steel | ||||
| 1/8 | __ | 30 psi @ 72° F | 0000000 | 000000 |
| 1/4 | __ | 30 psi @ 72° F | 0000000 | 00000 |
UN/UNF (SAE Straight) Threads | ||||
303 Stainless Steel | ||||
| __ | 1/4"-28 | 30 psi @ 72° F | 0000000 | 00000 |
316 Stainless Steel | ||||
| __ | 10-32 | 30 psi @ 72° F | 0000000 | 00000 |
| __ | 1/4"-28 | 30 psi @ 72° F | 0000000 | 00000 |
- Temperature Range: 32° to 300° F
| Thread Size | Max. Pressure | Each | |
UN/UNF (SAE Straight) Threads | |||
|---|---|---|---|
316 Stainless Steel | |||
| 10-32 | 45 psi @ 72° F | 0000000 | 000000 |
- Temperature Range: 32° to 300° F
| Pipe Size | Thread Size | Max. Pressure | Each | |
NPT Threads | ||||
|---|---|---|---|---|
316 Stainless Steel | ||||
| 1/8 | __ | 30 psi @ 72° F | 0000000 | 000000 |
| 1/4 | __ | 30 psi @ 72° F | 0000000 | 00000 |
UN/UNF (SAE Straight) Threads | ||||
303 Stainless Steel | ||||
| __ | 1/4"-28 | 30 psi @ 72° F | 0000000 | 00000 |
316 Stainless Steel | ||||
| __ | 10-32 | 30 psi @ 72° F | 0000000 | 00000 |
| __ | 1/4"-28 | 30 psi @ 72° F | 0000000 | 00000 |
- Temperature Range: 32° to 300° F
| Pipe Size | Thread Size | Thread Pitch, mm | Max. Pressure | Each | |
NPT Threads | |||||
|---|---|---|---|---|---|
316 Stainless Steel | |||||
| 1/8 | __ | __ | 45 psi @ 72° F | 0000000 | 000000 |
| 1/4 | __ | __ | 45 psi @ 72° F | 0000000 | 00000 |
Metric Threads | |||||
303 Stainless Steel | |||||
| __ | M6 | 1 | 30 psi @ 72° F | 0000000 | 00000 |
316 Stainless Steel | |||||
| __ | M6 | 1 | 30 psi @ 72° F | 0000000 | 00000 |
UN/UNF (SAE Straight) Threads | |||||
316 Stainless Steel | |||||
| __ | 10-32 | __ | 45 psi @ 72° F | 0000000 | 00000 |
| __ | 1/4"-28 | __ | 45 psi @ 72° F | 0000000 | 00000 |
- Temperature Range: 32° to 300° F
| Thread Size | Max. Pressure | Each | |
UN/UNF (SAE Straight) Threads | |||
|---|---|---|---|
316 Stainless Steel | |||
| 10-32 | 45 psi @ 72° F | 0000000 | 000000 |
Plastic Luer Lock Tube Couplings with Shut-Off for Air and Water
A built-in shut-off valve stops the flow when you separate these couplings, so air or water won’t leak from your line. Highly versatile, these couplings are compatible with any luer lock plug, socket, syringe, or needle. They secure with a half turn, so they’re often used in lines that are frequently disconnected. Thanks to their compact body, they fit in tight spaces. Use them in low-pressure applications.
Made of nylon, these couplings are lightweight and have good impact and abrasion resistance.
Note: For a complete coupling, order a plug and a socket.
Luer Lock Tube Couplings for Plastic and Rubber Tubing—Chemicals
- For Use With: Acetic Acid, Bleach, Ethanol, Hydrochloric Acid, Nitric Acid, Phosphoric Acid, Sulfuric Acid
- Tubing: Use with soft (Durometer 40A-65A) PVC plastic or silicone rubber
A staple in labs, these couplings are highly versatile, fitting any luer lock plug, socket, syringe, or needle. They lock together with a push and turn, so they work well in lines that are frequently disconnected. Use them in low-pressure applications. They have a compact body for installation in tight spaces. Made of PVDF, they resist most acids, alcohols, and organic solvents. PVDF is also known as Kynar.
Note: For a complete coupling, order a plug and a socket.
| Thread Size | Material | Color | Clarity | Max. Pressure | Locking Ring Included | Pkg. Qty. | Pkg. | |
UN/UNF (SAE Straight) Threads | ||||||||
|---|---|---|---|---|---|---|---|---|
| 1/4"-28 | PVDF Plastic | White | Semi-Clear | Not Rated | With Locking Ring | 10 | 0000000 | 000000 |
| Pipe Size | Material | Color | Clarity | Max. Pressure | Pkg. Qty. | Pkg. | |
NPT Threads | |||||||
|---|---|---|---|---|---|---|---|
| 1/8 | PVDF Plastic | White | Semi-Clear | Not Rated | 10 | 0000000 | 000000 |
| Pipe Size | Material | Color | Clarity | Max. Pressure | Pkg. Qty. | Pkg. | |
NPT Threads | |||||||
|---|---|---|---|---|---|---|---|
| 1/8 | PVDF Plastic | White | Semi-Clear | Not Rated | 10 | 0000000 | 000000 |