SAE J2494-3 Connectors | McMaster-Carr

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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.

Temperature Range: -40° to 210° F
Tubing: Use with hard (Durometer 65D) nylon plastic
Specifications Met: D.O.T. FMVSS 571, SAE J1131, SAE J2494-1, SAE J2494-3

Suitable for use in air brake lines, these fittings meet Department of Transportation FMVSS 571 safety standards for low-temperature applications. Also known as instant fittings, they connect to tubing with a push, and an internal gripping ring and O-ring hold the tubing tight. Fittings have a built-in tube support that slips inside the tubing to prevent it from collapsing. To disconnect, push on the release ring and pull the tubing out of the fitting. They have good corrosion resistance.

NPTF (Dryseal) threads are compatible with NPT threads. The male threads have an acrylic sealant applied to protect against leaks.

For technical drawings and 3-D models, click on a part number.

Straight Adapters, Tube × Male Threaded Pipe

NPTF Threads
For Tube OD	Pipe Size	Thread Size	Material	Max. Pressure	Features		Each
5/32"	1/8	__	Brass	150 psi @ 72° F	Acrylic Thread Sealant	000000000	00000
1/4"	1/8	__	Brass	150 psi @ 72° F	Acrylic Thread Sealant	00000000	0000
1/4"	1/4	__	Brass	150 psi @ 72° F	Acrylic Thread Sealant	00000000	0000
3/8"	1/4	__	Brass	150 psi @ 72° F	Acrylic Thread Sealant	00000000	0000
3/8"	3/8	__	Brass	150 psi @ 72° F	Acrylic Thread Sealant	00000000	0000
1/2"	3/8	__	Brass	150 psi @ 72° F	Acrylic Thread Sealant	000000000	0000
1/2"	1/2	__	Brass	150 psi @ 72° F	Acrylic Thread Sealant	00000000	00000
3/4"	3/4	__	Brass	150 psi @ 72° F	Acrylic Thread Sealant	000000000	00000
6mm	1/8	__	Brass	150 psi @ 72° F	Acrylic Thread Sealant	00000000	0000
6mm	1/4	__	Brass	150 psi @ 72° F	Acrylic Thread Sealant	000000000	0000
8mm	3/8	__	Brass	150 psi @ 72° F	Acrylic Thread Sealant	000000000	0000
Metric Threads
6mm	__	M12	Brass	150 psi @ 72° F	Acrylic Thread Sealant	000000000	0000
8mm	__	M12	Brass	150 psi @ 72° F	Acrylic Thread Sealant	000000000	00000
10mm	__	M12	Brass	150 psi @ 72° F	Acrylic Thread Sealant	000000000	00000
12mm	__	M16	Brass	150 psi @ 72° F	Acrylic Thread Sealant	000000000	00000

Straight Adapters, Tube × Female Threaded Pipe

NPTF Threads
For Tube OD	Pipe Size	Material	Max. Pressure		Each
1/4"	1/8	Brass	150 psi @ 72° F	00000000	00000
1/4"	1/4	Brass	150 psi @ 72° F	00000000	0000
3/8"	1/4	Brass	150 psi @ 72° F	00000000	00000
3/8"	3/8	Brass	150 psi @ 72° F	00000000	00000

Straight Connectors, Tube

For Tube OD	Material	Max. Pressure		Each
5/32"	Brass	150 psi @ 72° F	000000000	00000
1/4"	Brass	150 psi @ 72° F	00000000	0000
3/8"	Brass	150 psi @ 72° F	00000000	0000
1/2"	Brass	150 psi @ 72° F	00000000	00000
3/4"	Brass	150 psi @ 72° F	000000000	00000
4mm	Brass	150 psi @ 72° F	000000000	0000
6mm	Brass	150 psi @ 72° F	000000000	0000
8mm	Brass	150 psi @ 72° F	000000000	0000
10mm	Brass	150 psi @ 72° F	000000000	0000
12mm	Brass	150 psi @ 72° F	000000000	00000

90° Elbow Adapters (Intermittent Swivel), Tube × Male Threaded Pipe

Fittings with intermittent swivel rotate 360° before and after installation as needed to allow movement in the system and to prevent kinking.

NPTF Threads
For Tube OD	Pipe Size	Material	Max. Pressure	Features		Each
5/32"	1/8	Brass	150 psi @ 72° F	Acrylic Thread Sealant	000000000	00000
1/4"	1/8	Brass	150 psi @ 72° F	Acrylic Thread Sealant	00000000	0000
1/4"	1/4	Brass	150 psi @ 72° F	Acrylic Thread Sealant	00000000	0000
3/8"	1/4	Brass	150 psi @ 72° F	Acrylic Thread Sealant	00000000	0000
3/8"	3/8	Brass	150 psi @ 72° F	Acrylic Thread Sealant	00000000	00000
1/2"	3/8	Brass	150 psi @ 72° F	Acrylic Thread Sealant	000000000	00000
1/2"	1/2	Brass	150 psi @ 72° F	Acrylic Thread Sealant	00000000	00000
3/4"	3/4	Brass	150 psi @ 72° F	Acrylic Thread Sealant	000000000	00000

90° Elbow Connectors, Tube

For Tube OD	Material	Max. Pressure		Each
1/4"	Brass	150 psi @ 72° F	00000000	00000
3/8"	Brass	150 psi @ 72° F	00000000	00000
1/2"	Brass	150 psi @ 72° F	00000000	00000

45° Elbow Adapters (Intermittent Swivel), Tube × Male Threaded Pipe

Fittings with intermittent swivel rotate 360° before and after installation as needed to allow movement in the system and to prevent kinking.

NPTF Threads
For Tube OD	Pipe Size	Material	Max. Pressure	Features		Each
1/4"	1/8	Brass	150 psi @ 72° F	Acrylic Thread Sealant	00000000	00000
1/4"	1/4	Brass	150 psi @ 72° F	Acrylic Thread Sealant	00000000	0000
3/8"	1/4	Brass	150 psi @ 72° F	Acrylic Thread Sealant	00000000	00000
3/8"	3/8	Brass	150 psi @ 72° F	Acrylic Thread Sealant	00000000	00000
1/2"	3/8	Brass	150 psi @ 72° F	Acrylic Thread Sealant	00000000	00000
1/2"	1/2	Brass	150 psi @ 72° F	Acrylic Thread Sealant	000000000	00000

Inline Tee Adapters (Intermittent Swivel), Tube × Male Threaded Pipe

Fittings with intermittent swivel rotate 360° before and after installation as needed to allow movement in the system and to prevent kinking.

Inline tees are also known as branch tees.

NPTF Threads
For Tube OD	Pipe Size	Material	Max. Pressure	Features		Each
1/4"	1/8	Brass	150 psi @ 72° F	Acrylic Thread Sealant	00000000	000000
1/4"	1/4	Brass	150 psi @ 72° F	Acrylic Thread Sealant	00000000	00000
3/8"	1/4	Brass	150 psi @ 72° F	Acrylic Thread Sealant	00000000	00000
3/8"	3/8	Brass	150 psi @ 72° F	Acrylic Thread Sealant	00000000	00000
1/2"	3/8	Brass	150 psi @ 72° F	Acrylic Thread Sealant	00000000	00000
1/2"	1/2	Brass	150 psi @ 72° F	Acrylic Thread Sealant	000000000	00000

Right-Angle Tee Adapters (Intermittent Swivel), Tube × Male Threaded Pipe

Fittings with intermittent swivel rotate 360° before and after installation as needed to allow movement in the system and to prevent kinking.

Right-angle tees are also known as run tees.

NPTF Threads
For Tube OD	Pipe Size	Material	Max. Pressure	Features		Each
1/4"	1/8	Brass	150 psi @ 72° F	Acrylic Thread Sealant	00000000	000000
1/4"	1/4	Brass	150 psi @ 72° F	Acrylic Thread Sealant	00000000	00000
3/8"	1/4	Brass	150 psi @ 72° F	Acrylic Thread Sealant	00000000	00000
3/8"	3/8	Brass	150 psi @ 72° F	Acrylic Thread Sealant	00000000	00000
1/2"	3/8	Brass	150 psi @ 72° F	Acrylic Thread Sealant	00000000	00000
1/2"	1/2	Brass	150 psi @ 72° F	Acrylic Thread Sealant	000000000	00000

Tee Connectors, Tube

For Tube OD	Material	Max. Pressure		Each
1/4"	Brass	150 psi @ 72° F	00000000	000000
3/8"	Brass	150 psi @ 72° F	00000000	00000
1/2"	Brass	150 psi @ 72° F	00000000	00000
3/4"	Brass	150 psi @ 72° F	000000000	00000
6mm	Brass	150 psi @ 72° F	000000000	00000
8mm	Brass	150 psi @ 72° F	000000000	00000
10mm	Brass	150 psi @ 72° F	000000000	00000
12mm	Brass	150 psi @ 72° F	000000000	00000

Plugs

Plugs insert into the push-to-connect end of a fitting.

Tube Stem OD	Material	Color	Max. Pressure		Each
5/32"	Nylon Plastic	Black	150 psi @ 72° F	00000000	00000
1/4"	Nylon Plastic	Black	150 psi @ 72° F	00000000	000
3/8"	Nylon Plastic	Black	150 psi @ 72° F	00000000	0000
1/2"	Nylon Plastic	Black	150 psi @ 72° F	00000000	0000

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How to Identify and Measure Fittings

Low-Temperature D.O.T. Push-to-Connect Tube Fittings for Air