Compression Air Brake Tube Fittings

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Fitting Connection

Compression

System of Measurement

Tube OD

Shape

Pipe Size

Material

Tube Material

Thread Type

Fitting Type

Connects To

For Use With

Gender

Tube Hardness Rating

Nut Material

Sleeve Material

Maximum Pressure @ Temperature

90 psi @ 72° F

150 psi @ 72° F

220 psi @ 72° F

Export Control Classification Number (ECCN)

Maximum Temperature

REACH

Minimum Temperature

RoHS

Compliant with Exemptions

For Tube Hardness

Durometer 95A

Durometer 0D to Durometer 75D

Durometer 65D

Hardness

Durometer 95A

Durometer 0D to Durometer 75D

Durometer 65D

Maximum Vacuum @ Temperature

Not Rated

DFARS Specialty Metals

Exempt

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156 Products

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 200° F
Tubing: Use with hard (Durometer 65D) nylon plastic
Specifications Met: D.O.T. FMVSS 571

Safe for use in your air brake line, these fittings meet Department of Transportation FMVSS 571 standards. They’ve been tested for thermal cycling, vibration, and burst pressure, so put them to work right away. They have a single sleeve (ferrule) that compresses the tubing as you tighten the included nut, creating a strong seal. All components are made of brass and are corrosion resistant. Also known as flareless fittings.

Fittings with male threaded pipe connection have acrylic thread sealant to stop leaks and prevent loosening on the pipe end.

NPTF (Dryseal) threads are compatible with NPT threads.

Straight Adapters, Tube × Male Threaded Pipe

NPTF Threads
For Tube OD	Pipe Size	Material	Fitting Seal Type	Max. Pressure		Each
3/16"	1/8	Brass	Thread Sealant	150 psi @ 72° F	000000000	00000
1/4"	1/16	Brass	Thread Sealant	150 psi @ 72° F	000000000	00000
1/4"	1/8	Brass	Thread Sealant	150 psi @ 72° F	000000000	0000
1/4"	1/4	Brass	Thread Sealant	150 psi @ 72° F	000000000	0000
1/4"	3/8	Brass	Thread Sealant	150 psi @ 72° F	000000000	0000
3/8"	1/8	Brass	Thread Sealant	150 psi @ 72° F	000000000	0000
3/8"	1/4	Brass	Thread Sealant	150 psi @ 72° F	000000000	0000
3/8"	3/8	Brass	Thread Sealant	150 psi @ 72° F	000000000	0000
3/8"	1/2	Brass	Thread Sealant	150 psi @ 72° F	000000000	0000
1/2"	1/4	Brass	Thread Sealant	150 psi @ 72° F	000000000	00000
1/2"	3/8	Brass	Thread Sealant	150 psi @ 72° F	000000000	0000
1/2"	1/2	Brass	Thread Sealant	150 psi @ 72° F	000000000	0000
1/2"	3/4	Brass	Thread Sealant	150 psi @ 72° F	000000000	0000
5/8"	3/8	Brass	Thread Sealant	150 psi @ 72° F	000000000	0000
5/8"	1/2	Brass	Thread Sealant	150 psi @ 72° F	000000000	0000
5/8"	3/4	Brass	Thread Sealant	150 psi @ 72° F	000000000	0000
3/4"	1/2	Brass	Thread Sealant	150 psi @ 72° F	000000000	0000
3/4"	3/4	Brass	Thread Sealant	150 psi @ 72° F	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	000000000	00000
1/4"	1/4	Brass	150 psi @ 72° F	000000000	0000
3/8"	1/8	Brass	150 psi @ 72° F	000000000	0000
3/8"	1/4	Brass	150 psi @ 72° F	000000000	0000
3/8"	3/8	Brass	150 psi @ 72° F	000000000	0000
1/2"	3/8	Brass	150 psi @ 72° F	000000000	00000
5/8"	3/8	Brass	150 psi @ 72° F	000000000	00000
5/8"	1/2	Brass	150 psi @ 72° F	000000000	00000
3/4"	1/2	Brass	150 psi @ 72° F	000000000	00000

Straight Adapters (Intermittent Swivel), Tube × Male Threaded Pipe

Fittings with intermittent swivel allow movement in your system by rotating 360° before and after installation. They help keep tubes from kinking.

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

Straight Connectors, Tube

For Tube OD	Material	Max. Pressure		Each
3/16"	Brass	150 psi @ 72° F	000000000	000000
1/4"	Brass	150 psi @ 72° F	000000000	0000
3/8"	Brass	150 psi @ 72° F	000000000	0000
1/2"	Brass	150 psi @ 72° F	000000000	0000
5/8"	Brass	150 psi @ 72° F	000000000	0000
3/4"	Brass	150 psi @ 72° F	000000000	00000

Through-Wall Straight Connectors, Tube

Through-wall fittings are also known as bulkhead couplings and panel-mount couplings; they mount through your wall or panel to create an inlet or outlet.

For Tube OD	Material	Max. Pressure	For Hole Dia.	For Max. Wall Thick.		Each
1/4"	Brass	150 psi @ 72° F	9/16"	1/2"	000000000	00000
3/8"	Brass	150 psi @ 72° F	7/8"	11/16"	000000000	0000
1/2"	Brass	150 psi @ 72° F	1 1/8"	7/8"	000000000	0000

Short 90° Elbow Adapters, Tube × Male Threaded Pipe

NPTF Threads
For Tube OD	Pipe Size	Material	Fitting Seal Type	Max. Pressure		Each
3/16"	1/8	Brass	Thread Sealant	150 psi @ 72° F	000000000	000000
3/16"	1/4	Brass	Thread Sealant	150 psi @ 72° F	000000000	00000
1/4"	1/8	Brass	Thread Sealant	150 psi @ 72° F	000000000	0000
1/4"	1/4	Brass	Thread Sealant	150 psi @ 72° F	000000000	0000
1/4"	3/8	Brass	Thread Sealant	150 psi @ 72° F	000000000	0000
3/8"	1/8	Brass	Thread Sealant	150 psi @ 72° F	000000000	0000
3/8"	1/4	Brass	Thread Sealant	150 psi @ 72° F	000000000	0000
3/8"	3/8	Brass	Thread Sealant	150 psi @ 72° F	000000000	0000
3/8"	1/2	Brass	Thread Sealant	150 psi @ 72° F	000000000	00000
1/2"	3/8	Brass	Thread Sealant	150 psi @ 72° F	000000000	0000
1/2"	1/2	Brass	Thread Sealant	150 psi @ 72° F	000000000	0000
5/8"	1/2	Brass	Thread Sealant	150 psi @ 72° F	000000000	0000
5/8"	3/4	Brass	Thread Sealant	150 psi @ 72° F	000000000	00000
3/4"	1/2	Brass	Thread Sealant	150 psi @ 72° F	000000000	00000
3/4"	3/4	Brass	Thread Sealant	150 psi @ 72° F	000000000	00000

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

Fittings with intermittent swivel allow movement in your system by rotating 360° before and after installation. They help keep tubes from kinking.

NPTF Threads
For Tube OD	Pipe Size	Material	Fitting Seal Type	Max. Pressure		Each
3/8"	3/8	Brass	Thread Sealant	150 psi @ 72° F	000000000	000000

Long 90° Elbow Adapters, Tube × Male Threaded Pipe

NPTF Threads
For Tube OD	Pipe Size	Material	Fitting Seal Type	Max. Pressure		Each
3/8"	1/4	Brass	Thread Sealant	150 psi @ 72° F	000000000	000000

Short 90° Elbow Connectors, Tube

For Tube OD	Material	Max. Pressure		Each
1/4"	Brass	150 psi @ 72° F	000000000	00000
3/8"	Brass	150 psi @ 72° F	000000000	0000
1/2"	Brass	150 psi @ 72° F	000000000	00000

Short 45° Elbow Adapters, Tube × Male Threaded Pipe

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

Tee Connectors, Tube

For Tube OD	Material	Max. Pressure		Each
1/4"	Brass	150 psi @ 72° F	000000000	000000
3/8"	Brass	150 psi @ 72° F	000000000	00000
1/2"	Brass	150 psi @ 72° F	000000000	00000
5/8"	Brass	150 psi @ 72° F	000000000	00000

Nuts

For Tube OD	Nut Material	Max. Pressure	Pkg. Qty.		Pkg.
3/16"	Brass	150 psi @ 72° F	5	000000000	000000
1/4"	Brass	150 psi @ 72° F	10	000000000	0000
3/8"	Brass	150 psi @ 72° F	10	000000000	0000
1/2"	Brass	150 psi @ 72° F	5	000000000	0000
5/8"	Brass	150 psi @ 72° F	5	000000000	0000
3/4"	Brass	150 psi @ 72° F	5	000000000	00000

Sleeves

For Tube OD	Sleeve Material	Max. Pressure	Pkg. Qty.		Pkg.
3/16"	Brass	150 psi @ 72° F	5	000000000	000000
1/4"	Brass	150 psi @ 72° F	10	000000000	0000
3/8"	Brass	150 psi @ 72° F	10	000000000	0000
1/2"	Brass	150 psi @ 72° F	10	000000000	0000
5/8"	Brass	150 psi @ 72° F	10	000000000	0000
3/4"	Brass	150 psi @ 72° F	10	000000000	0000

Sleeves for D.O.T. Brass Compression Tube Fittings for Air

Tubing: Use with hard (Durometer 65D) nylon plastic
Specifications Met: D.O.T. FMVSS 571
Temperature Range: -40° to 200° F

Use these sleeves with D.O.T. brass compression nuts and fittings to create a seal on nylon tubing. They are brass for good corrosion resistance.

For Tube OD	Sleeve Material	Max. Pressure	Pkg. Qty.		Pkg.
3/16"	Brass	150 psi @ 72° F	5	000000000	000000
1/4"	Brass	150 psi @ 72° F	10	000000000	0000
3/8"	Brass	150 psi @ 72° F	10	000000000	0000
1/2"	Brass	150 psi @ 72° F	10	000000000	0000
5/8"	Brass	150 psi @ 72° F	10	000000000	0000
3/4"	Brass	150 psi @ 72° F	10	000000000	0000

Nuts for D.O.T. Brass Compression Tube Fittings for Air

Tubing: Use with hard (Durometer 65D) nylon plastic
Specifications Met: D.O.T. FMVSS 571
Temperature Range: -40° to 200° F

Use these nuts with D.O.T. brass compression sleeves and fittings to create a seal on nylon tubing. They are brass for good corrosion resistance.

For Tube OD	Nut Material	Max. Pressure	Pkg. Qty.		Pkg.
3/16"	Brass	150 psi @ 72° F	5	000000000	000000
1/4"	Brass	150 psi @ 72° F	10	000000000	0000
3/8"	Brass	150 psi @ 72° F	10	000000000	0000
1/2"	Brass	150 psi @ 72° F	5	000000000	0000
5/8"	Brass	150 psi @ 72° F	5	000000000	0000
3/4"	Brass	150 psi @ 72° F	5	000000000	00000

Tight-Seal Brass Compression Tube Fittings for Air and Water

Temperature Range: -65° to 250° F
Tubing: Use with firm (Durometer 95A) EVA plastic or polyurethane rubber
Specifications Met: SAE J512

A built-in tube support slips inside the tubing to prevent collapsing and provides a sturdy connection for an extra-tight seal. Fittings have a single sleeve (ferrule) that compresses the tubing as you tighten the nut. The nut and sleeve are included. Fittings are also known as flareless fittings. They are brass for good corrosion resistance.

Straight Adapters, Tube × Male Threaded Pipe

NPT Threads
For Tube OD	Pipe Size	Material	Max. Pressure		Each
1/4"	1/8	Brass	90 psi @ 72° F	00000000	00000
1/4"	1/4	Brass	90 psi @ 72° F	00000000	0000
1/4"	3/8	Brass	90 psi @ 72° F	00000000	0000
1/4"	1/2	Brass	90 psi @ 72° F	00000000	0000
1/4"	3/4	Brass	90 psi @ 72° F	000000000	00000
3/8"	1/8	Brass	90 psi @ 72° F	00000000	0000
3/8"	1/4	Brass	90 psi @ 72° F	00000000	0000
3/8"	3/8	Brass	90 psi @ 72° F	00000000	0000
3/8"	1/2	Brass	90 psi @ 72° F	00000000	0000
3/8"	3/4	Brass	90 psi @ 72° F	000000000	00000
1/2"	1/4	Brass	90 psi @ 72° F	000000000	0000
1/2"	3/8	Brass	90 psi @ 72° F	00000000	0000
1/2"	1/2	Brass	90 psi @ 72° F	00000000	0000
5/8"	1/2	Brass	90 psi @ 72° F	000000000	00000

Straight Adapters, Tube × Female Threaded Pipe

NPT Threads
For Tube OD	Pipe Size	Material	Max. Pressure		Each
1/4"	1/8	Brass	90 psi @ 72° F	00000000	00000
1/4"	1/4	Brass	90 psi @ 72° F	00000000	0000
1/4"	3/8	Brass	90 psi @ 72° F	00000000	0000
1/4"	1/2	Brass	90 psi @ 72° F	00000000	00000
3/8"	1/8	Brass	90 psi @ 72° F	00000000	0000
3/8"	1/4	Brass	90 psi @ 72° F	00000000	0000
3/8"	3/8	Brass	90 psi @ 72° F	00000000	0000
3/8"	1/2	Brass	90 psi @ 72° F	00000000	0000
1/2"	3/8	Brass	90 psi @ 72° F	00000000	0000
1/2"	1/2	Brass	90 psi @ 72° F	00000000	00000

Straight Adapters, Tube × 45° Female Flared Tube

Fittings with 45° female flared tube end have an internal flare that mates with a male 45° flared fitting.

UN/UNF (SAE 45°) Threads
For Tube OD	Material	Max. Pressure		Each
1/4"	Brass	90 psi @ 72° F	00000000	00000
3/8"	Brass	90 psi @ 72° F	00000000	0000

Straight Connectors, Tube

For Tube OD	Material	Max. Pressure		Each
1/4"	Brass	90 psi @ 72° F	00000000	00000
3/8"	Brass	90 psi @ 72° F	00000000	0000
1/2"	Brass	90 psi @ 72° F	00000000	0000

Straight Reducers, Tube

For Tube OD (A)	For Tube OD (B)	Material	Max. Pressure		Each
3/8"	1/4"	Brass	90 psi @ 72° F	00000000	00000
1/2"	3/8"	Brass	90 psi @ 72° F	00000000	00000

Straight Reducing Adapters, Tube × 45° Female Flared Tube

Fittings with 45° female flared tube end have an internal flare that mates with a male 45° flared fitting.

UN/UNF (SAE 45°) Threads
For Tube OD (A)	For Tube OD (B)	Material	Max. Pressure		Each
3/8"	1/4"	Brass	90 psi @ 72° F	00000000	00000

90° Elbow Adapters, Tube × Male Threaded Pipe

NPT Threads
For Tube OD	Pipe Size	Material	Max. Pressure		Each
1/4"	1/8	Brass	90 psi @ 72° F	00000000	00000
1/4"	1/4	Brass	90 psi @ 72° F	00000000	0000
1/4"	3/8	Brass	90 psi @ 72° F	00000000	0000
1/4"	1/2	Brass	90 psi @ 72° F	00000000	00000
3/8"	1/8	Brass	90 psi @ 72° F	00000000	0000
3/8"	1/4	Brass	90 psi @ 72° F	00000000	0000
3/8"	3/8	Brass	90 psi @ 72° F	00000000	0000
3/8"	1/2	Brass	90 psi @ 72° F	00000000	0000
1/2"	1/4	Brass	90 psi @ 72° F	000000000	00000
1/2"	3/8	Brass	90 psi @ 72° F	00000000	0000
1/2"	1/2	Brass	90 psi @ 72° F	00000000	00000

90° Elbow Adapters, Tube × Female Threaded Pipe

NPT Threads
For Tube OD	Pipe Size	Material	Max. Pressure		Each
1/4"	1/8	Brass	90 psi @ 72° F	00000000	00000
1/4"	1/4	Brass	90 psi @ 72° F	00000000	0000
1/4"	3/8	Brass	90 psi @ 72° F	00000000	00000
1/4"	1/2	Brass	90 psi @ 72° F	00000000	00000
3/8"	1/8	Brass	90 psi @ 72° F	00000000	00000
3/8"	1/4	Brass	90 psi @ 72° F	00000000	0000
3/8"	3/8	Brass	90 psi @ 72° F	00000000	0000
1/2"	3/8	Brass	90 psi @ 72° F	00000000	00000
1/2"	1/2	Brass	90 psi @ 72° F	00000000	00000

90° Elbow Connectors, Tube

For Tube OD	Material	Max. Pressure		Each
1/4"	Brass	90 psi @ 72° F	00000000	00000
3/8"	Brass	90 psi @ 72° F	00000000	0000
1/2"	Brass	90 psi @ 72° F	00000000	00000

90° Elbow Reducers, Tube

For Tube OD (A)	For Tube OD (B)	Material	Max. Pressure		Each
3/8"	1/4"	Brass	90 psi @ 72° F	00000000	000000
1/2"	3/8"	Brass	90 psi @ 72° F	00000000	00000

Inline Tee Adapters, Tube × Male Threaded Pipe

Inline tees are also known as branch tees.

NPT Threads
For Tube OD	Pipe Size	Material	Max. Pressure		Each
1/4"	1/8	Brass	90 psi @ 72° F	00000000	00000
1/4"	1/4	Brass	90 psi @ 72° F	00000000	00000
3/8"	1/8	Brass	90 psi @ 72° F	00000000	00000
3/8"	1/4	Brass	90 psi @ 72° F	00000000	00000
3/8"	3/8	Brass	90 psi @ 72° F	00000000	00000
1/2"	3/8	Brass	90 psi @ 72° F	00000000	00000
1/2"	1/2	Brass	90 psi @ 72° F	00000000	00000

Inline Tee Reducers, Tube

Inline tees are also known as branch tees.

For Tube OD (A)	For Tube OD (B)	Material	Max. Pressure		Each
3/8"	1/4"	Brass	90 psi @ 72° F	00000000	000000

Tee Connectors, Tube

For Tube OD	Material	Max. Pressure		Each
1/4"	Brass	90 psi @ 72° F	00000000	00000
3/8"	Brass	90 psi @ 72° F	00000000	00000
1/2"	Brass	90 psi @ 72° F	00000000	00000

Replacement Nuts

For Tube OD	Nut Material	Max. Pressure	Pkg. Qty.		Pkg.
1/4"	Brass	90 psi @ 72° F	25	00000000	000000
3/8"	Brass	90 psi @ 72° F	25	00000000	00000
1/2"	Brass	90 psi @ 72° F	10	00000000	00000

Replacement Sleeves

	Sleeve
For Tube OD	Material	Color	Max. Pressure	Pkg. Qty.		Pkg.
1/4"	Acetal Plastic	White	90 psi @ 72° F	25	00000000	00000
3/8"	Acetal Plastic	White	90 psi @ 72° F	25	00000000	0000
1/2"	Acetal Plastic	White	90 psi @ 72° F	25	00000000	00000
5/8"	Acetal Plastic	White	90 psi @ 72° F	10	000000000	0000

Sleeves for Tight-Seal Brass Compression Tube Fittings for Air and Water

Tubing: Use with firm (Durometer 95A) EVA plastic or polyurethane rubber
Specifications Met: SAE J512
Temperature Range: -65° to 250° F

Use these sleeves with tight-seal brass compression nuts and fittings to create a seal on plastic and rubber tubing. They are acetal, so they won’t damage tubing.

	Sleeve
For Tube OD	Material	Color	Max. Pressure	Pkg. Qty.		Pkg.
1/4"	Acetal Plastic	White	90 psi @ 72° F	25	00000000	00000
3/8"	Acetal Plastic	White	90 psi @ 72° F	25	00000000	0000
1/2"	Acetal Plastic	White	90 psi @ 72° F	25	00000000	00000
5/8"	Acetal Plastic	White	90 psi @ 72° F	10	000000000	0000

Nuts for Tight-Seal Brass Compression Tube Fittings for Air and Water

Tubing: Use with firm (Durometer 95A) EVA plastic or polyurethane rubber
Specifications Met: SAE J512
Temperature Range: -65° to 250° F

Use these nuts with tight-seal brass compression sleeves and fittings to create a seal on plastic and rubber tubing. They are brass for good corrosion resistance.

For Tube OD	Nut Material	Max. Pressure	Pkg. Qty.		Pkg.
1/4"	Brass	90 psi @ 72° F	25	00000000	000000
3/8"	Brass	90 psi @ 72° F	25	00000000	00000
1/2"	Brass	90 psi @ 72° F	10	00000000	00000

Plastic Compression Tube Fittings for Water

Temperature Range: -40° to 200° F
Tubing: Use with firm or hard (Durometer 1A-90A or Durometer OD-75D) nylon plastic or polypropylene plastic

Made of acetal, these compression fittings are lighter in weight than metal compression fittings and won’t absorb moisture when used in wet environments. Fittings include a nut with a built-in sleeve (ferrule), so there’s no need to remove the nut for assembly. The sleeve compresses the tubing as you tighten the nut, creating a strong seal. Fittings are also known as flareless fittings.

Tube supports (sold separately) are recommended if you want to use the fittings with soft nylon and polypropylene tubing to prevent the tube from collapsing.

Tee Reducers, Tube

				Nut
For Tube OD (A)	For Tube OD (B)	Color	Max. Pressure	Material		Each
5/8"	3/8"	White	220 psi @ 72° F	Acetal Plastic	00000000	00000
7/8"	5/8"	White	220 psi @ 72° F	Acetal Plastic	00000000	0000