Luer Lock Tube Caps | McMaster-Carr

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41 Products

About Measuring Fittings

Measure the threaded ends of your fittings to identify their pipe size, thread size, schedule, and thread type. Then, find compatible components.

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.

Plugs without a locking ring are quicker to install and remove than those with a locking ring. Also known as luer slip couplings, all they need is a light push to secure. Add a snap-on ring (sold separately) to lock your coupling in place and color code your line.

Note: For a complete coupling, order a plug and a socket.

Snap-On Locking Rings for Plugs Without Locking Rings

Nylon Plastic
Color	Clarity	Pkg. Qty.		Pkg.
Black	Opaque	10	51525K534	00000
Blue	Opaque	10	51525K537	0000
Green	Opaque	10	51525K536	0000
Red	Opaque	10	51525K535	0000
White	Opaque	10	51525K533	0000
Polypropylene Plastic
White	Semi-Clear	10	51525K538	0000

Caps for Plugs

Nylon Plastic
Color	Clarity	Max. Pressure	Temp. Range, °F	Pkg. Qty.		Pkg.
Blue	Opaque	Not Rated	Not Rated	10	51525K569	00000
Red	Opaque	Not Rated	Not Rated	10	51525K514	0000
White	Opaque	40 psi @ 72° F	-20° to 200° F	10	51525K315	0000
Polycarbonate Plastic
Clear	Clear	40 psi @ 72° F	-20° to 200° F	10	51525K245	0000
Polypropylene Plastic
White	Semi-Clear	40 psi @ 72° F	35° to 150° F	10	51525K372	0000

End Plugs

With Locking Ring

Without Locking Ring

Tie plugs with a tether ring to equipment so they’re always where you need them.

Plugs with a vented tip release fluid and gases trapped below the cap, making them a good choice for vacuum applications.

Nylon Plastic
Color	Clarity	Max. Pressure	Temp. Range, °F	Features	Locking Ring Included	Pkg. Qty.		Pkg.
Open Tip
Red	Opaque	Not Rated	Not Rated	__	With Locking Ring	10	51525K515	00000
White	Opaque	40 psi @ 72° F	-20° to 200° F	__	With Locking Ring	10	51525K311	0000
White	Opaque	Not Rated	Not Rated	Tether Ring	Without Locking Ring	10	51525K561	0000
White	Opaque	Not Rated	Not Rated	Vented Tip	With Locking Ring	10	51525K571	0000
Closed Tip
White	Opaque	Not Rated	Not Rated	__	With Locking Ring	10	51525K516	0000
Polycarbonate Plastic
Open Tip
Clear	Clear	40 psi @ 72° F	-20° to 200° F	__	With Locking Ring	10	51525K244	0000
Closed Tip
Clear	Clear	Not Rated	Not Rated	__	With Locking Ring	10	51525K573	0000
Polypropylene Plastic
Open Tip
White	Semi-Clear	40 psi @ 72° F	35° to 150° F	__	With Locking Ring	10	51525K371	0000
White	Semi-Clear	Not Rated	Not Rated	__	Without Locking Ring	10	51525K575	0000
White	Semi-Clear	Not Rated	Not Rated	Tether Ring	Without Locking Ring	10	51525K562	0000
White	Semi-Clear	Not Rated	Not Rated	Vented Tip	With Locking Ring	10	51525K572	0000
Closed Tip
White	Semi-Clear	Not Rated	Not Rated	__	With Locking Ring	10	51525K517	0000

Combo Cap/Plug

Combo cap/plugs close off a plug on one end and a socket with the other. They save space by doing the job of both a cap and an end plug.

Nylon Plastic
Color	Clarity	Max. Pressure	Temp. Range, °F	Locking Ring Included	Pkg. Qty.		Pkg.
Open Tip
White	Opaque	Not Rated	Not Rated	With Locking Ring	10	51525K518	00000
Polypropylene Plastic
Open Tip
White	Semi-Clear	Not Rated	Not Rated	With Locking Ring	10	51525K519	0000

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.

Plugs for Sockets with Round Body

Temperature Range: 32° to 300° F

303 Stainless Steel
Max. Pressure		Each
30 psi @ 72° F	5194K17	000000
316 Stainless Steel
30 psi @ 72° F	5194K37	00000

Plugs for Sockets with Hex Body

Temperature Range: 32° to 300° F

316 Stainless Steel
Max. Pressure		Each
45 psi @ 72° F	6514N35	000000

Caps for Plugs with Round Body

Temperature Range: 32° to 300° F

316 Stainless Steel
Max. Pressure		Each
30 psi @ 72° F	5194K38	000000

Caps for Plugs with Hex Body

Temperature Range: 32° to 300° F

316 Stainless Steel
Max. Pressure		Each
45 psi @ 72° F	6514N34	000000

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.

Caps for Plugs

Temperature Range: -100° to 300° F

Material	Max. Pressure		Each
Nickel-Plated Brass	30 psi @ 72° F	51465K169	00000

Plugs for Sockets

Temperature Range: -100° to 300° F

Material	Max. Pressure		Each
Nickel-Plated Brass	30 psi @ 72° F	51465K165	00000

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.

Caps for Plugs

Material	Color	Clarity	Max. Pressure	Pkg. Qty.		Pkg.
PVDF Plastic	White	Semi-Clear	Not Rated	10	7466N26	000000

End Plugs

Open Tip

Closed Tip

Open Tip
Material	Color	Clarity	Max. Pressure	Locking Ring Included	Pkg. Qty.		Pkg.
PVDF Plastic	White	Semi-Clear	Not Rated	With Locking Ring	10	7466N27	00000
Closed Tip
PVDF Plastic	White	Semi-Clear	Not Rated	With Locking Ring	10	7466N28	0000

Luer Lock Tube Couplings for Plastic and Rubber Tubing—High-Purity

For Use With: Air, Water
Temperature Range: Nylon Plastic: -50° to 275° F
Polyolefin Plastic: Up to 355° F
Polypropylene Plastic: -5° to 150° F
Tubing: Use with soft or firm (Durometer 50A-95A) polyolefin plastic, PVC plastic, silicone rubber, TPE plastic, or TPU plastic

To prevent contamination, these couplings are cleaned, double bagged, and packaged in a clean room. This makes them a great choice for applications where cleanliness is critical, such as semiconductor manufacturing. Known for their versatility, they fit any luer lock plug, socket, syringe, or needle. They’re quick to attach and detach, 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.

Note: For a complete coupling, order a plug and a socket.

Nylon couplings have excellent impact and abrasion resistance. Use them in general purpose applications. Polyolefin couplings are BPA-free and autoclavable. Polypropylene couplings resist moisture and chemicals, including solvents. They also stand up to impact and abrasion.

Plugs with a locking ring are more secure than those without a locking ring. Give the ring a half turn to lock them in place. You can’t remove the locking ring.

Caps for Plugs

Nylon Plastic
Color	Clarity	Max. Pressure	Environmental Rating	Pkg. Qty.		Pkg.
White	Opaque	150 psi @ 72° F	ISO Class 7	5	7501N222	00000
Polyolefin Plastic
Clear	Clear	Not Rated	ISO Class 7	5	7501N223	0000
Polypropylene Plastic
White	Semi-Clear	Not Rated	ISO Class 7	5	7501N221	0000

End Plugs

Nylon Plastic
Color	Clarity	Max. Pressure	Environmental Rating	Locking Ring Included	Pkg. Qty.		Pkg.
Open Tip
White	Opaque	150 psi @ 72° F	ISO Class 7	With Locking Ring	5	7501N225	00000
Polyolefin Plastic
Open Tip
Clear	Clear	Not Rated	ISO Class 7	With Locking Ring	5	7501N226	0000
Polypropylene Plastic
Open Tip
White	Semi-Clear	Not Rated	ISO Class 7	With Locking Ring	5	7501N224	0000