Compression Air Brake Tube Fittings

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119 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

Fittings meet Department of Transportation FMVSS 571 safety standards for air brake lines. They have a single sleeve (ferrule) that compresses the tubing as you tighten the nut, creating a strong seal. The nut and sleeve are included. Fittings are also known as flareless fittings. They are brass for good corrosion resistance.

NPTF (Dryseal) threads are compatible with NPT threads.

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	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
1/4"	3/8	Brass	150 psi @ 72° F	000000000	00000
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
3/8"	1/2	Brass	150 psi @ 72° F	000000000	0000
1/2"	1/4	Brass	150 psi @ 72° F	000000000	0000
1/2"	3/8	Brass	150 psi @ 72° F	000000000	00000
1/2"	1/2	Brass	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	00000
1/2"	3/8	Brass	150 psi @ 72° F	000000000	00000

Straight 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

90° Elbow Adapters, Tube × Male 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
1/4"	3/8	Brass	150 psi @ 72° F	000000000	00000
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
1/2"	1/2	Brass	150 psi @ 72° F	000000000	00000

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

Nuts

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

Sleeves

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

Sleeves for D.O.T. Brass Compression Tube Fittings with Thread Sealant 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 technical drawings and 3-D models, click on a part number.

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	00000

Nuts for D.O.T. Brass Compression Tube Fittings with Thread Sealant 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 technical drawings and 3-D models, click on a part number.

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	00000
3/8"	Brass	150 psi @ 72° F	10	000000000	00000
1/2"	Brass	150 psi @ 72° F	5	000000000	00000
5/8"	Brass	150 psi @ 72° F	5	000000000	00000
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.

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

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.

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

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

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.

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

Tee Reducers, Tube

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

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How to Identify and Measure Fittings

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

Sleeves for D.O.T. Brass Compression Tube Fittings with Thread Sealant for Air

Nuts for D.O.T. Brass Compression Tube Fittings with Thread Sealant for Air

Tight-Seal Brass Compression Tube Fittings for Air and Water

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

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

Plastic Compression Tube Fittings for Water