M3 Tube Fittings | McMaster-Carr

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Shape

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Thread Pitch

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Connects To

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For Use With

Sodium Carbonate (Soda Ash)

Sodium Hypochlorite (Bleach)

Length

Tube Hardness Rating

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Tube Material

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REACH

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Compliant with Exemptions

DFARS Specialty Metals

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Export Control Classification Number (ECCN)

2B999

EAR99

Release Ring Material

Plastic

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Standard

O-Ring Material

Buna-N

Viton® Fluoroelastomer

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44 Products

How to Measure Threaded Pipe Size

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.

BSPP, Metric, and
UN/UNF (SAE Straight)
Male Threads with Gasket

Temperature Range: 0° to 170° F, except polybutylene plastic fittings are 32° to 140° F
Tubing: Use with firm (Durometer 95A-45D) polyethylene plastic or polyurethane rubber
Specifications Met: ISO 14743, except cartridges and polybutylene plastic fittings

Insert tubing into these fittings and an internal gripping ring and O-ring hold the tubing tight. They are also known as instant fittings. To disconnect, push on the release ring and pull the tubing out of the fitting. Fittings have good corrosion resistance. Use them in low-pressure applications.

Identification rings (sold separately) snap over the release ring so you can color-code your lines.

Clips (sold separately) align and organize your tubing and fittings.

Metric male threads have either a gasket or a thread sealant to protect against leaks.

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

Straight Adapters, Tube × Male Threaded Pipe

BSPP, Metric, and
UN/UNF (SAE Straight)
Male Threads with Gasket

					Release Ring
For Tube OD	Thread Size	Thread Pitch, mm	Material	Gasket Material	Material	Color	Max. Pressure		Each
Metric Threads
3mm	M3	0.5	Nickel-Plated Brass	Buna-N Rubber	Plastic	Black	290 psi @ 72° F	00000000	000000
4mm	M3	0.5	Nickel-Plated Brass	Buna-N Rubber	Plastic	Black	290 psi @ 72° F	00000000	0000

Short 90° Elbow Adapters with Slotted Drive, Tube × Male Threaded Pipe

BSPP, Metric, and
UN/UNF (SAE Straight)
Male Threads with Gasket

Fittings with external hex or slotted drive allow for easy adjustments in tight spaces; they are also known as banjo-style fittings.

Metric Threads
For Tube OD, mm	Thread Size	Thread Pitch, mm	Tube Connection Material	Pipe Connection Material	Gasket Material	Color	Release Ring Color	Max. Pressure		Each
3	M3	0.5	Nylon Plastic	Nickel-Plated Brass	Buna-N Rubber	Black	Black	290 psi @ 72° F	00000000	000000

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

BSPP, Metric, and
UN/UNF (SAE Straight)
Male Threads with Gasket

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

Metric Threads
For Tube OD	Thread Size	Thread Pitch, mm	Tube Connection Material	Pipe Connection Material	Gasket Material	Color	Release Ring Color	Max. Pressure		Each
3mm	M3	0.5	Nylon Plastic	Nickel-Plated Brass	Buna-N Rubber	Black	Black	290 psi @ 72° F	00000000	000000
4mm	M3	0.5	Nylon Plastic	Nickel-Plated Brass	Buna-N Rubber	Black	Black	290 psi @ 72° F	00000000	00000

Nickel-Plated Brass Push-to-Connect Tube Fittings for Air

Metric and UN/UNF
(SAE Straight) Male
Threads with Gasket

For Use With: Air, Lubricated Air
Temperature Range: 0° to 140° F
Tubing: Fittings with Release Ring and Fittings with no Release Type: Use with firm or hard (Durometer 95A-60D) nylon plastic, polyethylene plastic or polyurethane rubber
Fittings with Release Sleeve: Use with firm or hard (Durometer 95A-60D) polyethylene plastic or polyurethane rubber

Made of nickel-plated brass, these fittings have better corrosion resistance than unplated brass fittings. Also known as instant fittings, they connect to tubing with a push, and an internal gripping ring and O-ring hold the tubing tight. To disconnect, push on the release ring or sleeve and pull the tubing out of the fitting.

Fittings with release sleeve are easier to disconnect than fittings with a release ring because they are seamless and won't collect dirt and debris.

Metric and UN/UNF (SAE Straight) male threads with gasket or thread sealant provide extra protection against leaks.

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

Straight Adapters, Tube × Male Threaded Pipe

Release Sleeve

Metric and UN/UNF
(SAE Straight) Male
Threads with Gasket

						Release Sleeve
For Tube OD	Thread Size	Thread Pitch, mm	Material	Gasket Material	Max. Pressure		Each
Metric Threads
1/8"	M3	0.5	Nickel-Plated Brass	Buna-N Rubber	230 psi @ 72° F	00000000	000000
5/32"	M3	0.5	Nickel-Plated Brass	Buna-N Rubber	230 psi @ 72° F	00000000	00000
3/16"	M3	0.5	Nickel-Plated Brass	Buna-N Rubber	230 psi @ 72° F	00000000	00000
3mm	M3	0.5	Nickel-Plated Brass	Buna-N Rubber	230 psi @ 72° F	00000000	00000
4mm	M3	0.5	Nickel-Plated Brass	Buna-N Rubber	230 psi @ 72° F	00000000	00000
5mm	M3	0.5	Nickel-Plated Brass	Buna-N Rubber	230 psi @ 72° F	00000000	00000
6mm	M3	0.5	Nickel-Plated Brass	Buna-N Rubber	230 psi @ 72° F	00000000	00000

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

Metric and UN/UNF
(SAE Straight) Male
Threads with Gasket

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

						Release Sleeve
For Tube OD	Thread Size	Thread Pitch, mm	Material	Gasket Material	Max. Pressure		Each
Metric Threads
1/8"	M3	0.5	Nickel-Plated Brass	Buna-N Rubber	230 psi @ 72° F	00000000	000000
5/32"	M3	0.5	Nickel-Plated Brass	Buna-N Rubber	230 psi @ 72° F	00000000	00000
3/16"	M3	0.5	Nickel-Plated Brass	Buna-N Rubber	230 psi @ 72° F	00000000	00000
3mm	M3	0.5	Nickel-Plated Brass	Buna-N Rubber	230 psi @ 72° F	00000000	00000
4mm	M3	0.5	Nickel-Plated Brass	Buna-N Rubber	230 psi @ 72° F	00000000	00000
6mm	M3	0.5	Nickel-Plated Brass	Buna-N Rubber	230 psi @ 72° F	00000000	00000

Aluminum Low-Pressure Barbed Tube Fittings for Air and Water

For Use With: Air, Lubricated Air, Water
Temperature Range: -40° to 230° F
Tubing: Use with hard (Durometer 75A-60D) EVA plastic, polyethylene plastic, polyurethane rubber or PVDF plastic

Made of aluminum, these fittings are lighter in weight than other metal barbed tube fittings and have good corrosion resistance. The barb grips onto tubing, providing a secure hold with no clamp required.

Metric, BSPP, and UN/UNF (SAE Straight) male threads have a gasket or O-ring for a tight seal.

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

Straight Adapters, Tube × Male Threaded Pipe

Metric and UN/UNF
(SAE Straight) Male
Threads with Gasket

Metric Threads
For Tube ID	Thread Size	Thread Pitch, mm	Material	Gasket Material	Max. Pressure		Each
1mm	M3	0.5	Aluminum	Fiber	125 psi @ 72° F	0000000	00000
2mm	M3	0.5	Aluminum	Fiber	125 psi @ 72° F	0000000	0000
4mm	M3	0.5	Aluminum	Fiber	125 psi @ 72° F	0000000	0000

Straight Adapters, Tube × Female Threaded Pipe

Metric Threads
For Tube ID	Thread Size	Thread Pitch, mm	Material	Max. Pressure		Each
4mm	M3	0.5	Aluminum	125 psi @ 72° F	0000000	00000

Nickel-Plated Brass Low-Pressure Barbed Tube Fittings for Air and Water

The nickel plating on these brass fittings provides extra protection against corrosive environments. The plating won’t peel or chip, so the fittings keep a bright, polished appearance. The barbs grip onto tubing, providing a secure hold with no clamp required.

Metric male threads have a fiber gasket or O-ring for a tight seal.

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

Straight Adapters, Tube × Male Threaded Pipe

Metric, UN/UNF
(SAE Straight) and BSPP
Male Threads with Gasket

Temperature Range: -40° to 230° F,
except UN/UNF (SAE Straight) Threads: -20° to 160° F
Tubing: Use with hard (Durometer 60D-90D) Buna-N rubber, EVA plastic, Nylon plastic, polyethylene plastic, polypropylene plastic, polyurethane rubber, PTFE plastic, PVC plastic, PVDF plastic, or silicone rubber,
except UN/UNF (SAE Straight) Threads: Use with firm (Durometer 85A) polyurethane rubber

Metric Threads
For Tube ID	Thread Size	Material	Gasket Material	Max. Pressure		Each
1mm	M3	Nickel-Plated Brass	Fiber	120 psi @ 72° F	0000000	000000
2mm	M3	Nickel-Plated Brass	Fiber	120 psi @ 72° F	0000000	0000
4mm	M3	Nickel-Plated Brass	Fiber	120 psi @ 72° F	0000000	0000

Choose-a-Color Aluminum Low-Pressure Barbed Tube Fittings for Air and Water

For Use With: Air, Lubricated Air, Water
Temperature Range: -40° to 230° F
Tubing: Use with hard (Durometer 75A-60D) EVA plastic, polyethylene plastic, polyurethane rubber or PVDF plastic

Color-code fittings for easy identification. Fittings are aluminum, which is lightweight with good corrosion resistance. The barb grips onto tubing, providing a secure hold with no clamp required.

Metric and UN/UNF (SAE Straight) male threads have a gasket for a tight seal.

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

Straight Adapters, Tube × Male Threaded Pipe

Metric and UN/UNF
(SAE Straight) Male
Threads with Gasket

Metric Threads
For Tube ID	Thread Size	Thread Pitch, mm	Material	Gasket Material	Max. Pressure	Choose a Color		Each
2mm	M3	0.5	Anodized Aluminum	Fiber	125 psi @ 72° F	Black, Blue, Red	00000000	000000

Stainless Steel High-Pressure Barbed Tube Fittings for Air and Water

Temperature Range: See table
Tubing: Use with firm (Durometer 75A-95A) EVA plastic, polyethylene plastic, polypropylene plastic or PVC plastic

Fittings withstand pressures up to 250 psi. They are 303 stainless steel for very good corrosion resistance.

Metric, BSPP, and UN/UNF (SAE Straight) male threads have a gasket to protect against leaks.

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

Straight Adapters, Tube × Male Threaded Pipe

Metric, BSPP, and
UN/UNF (SAE Straight)
Male Threads with Gasket

Metric Threads
For Tube ID	Thread Size	Thread Pitch, mm	Material	Gasket Material	Max. Pressure	Temp. Range, °F	Number of Barbs		Each
1mm	M3	0.5	303 Stainless Steel	Viton® Fluoroelastomer Rubber	250 psi @ 72° F	-40° to 500° F	Single	00000000	000000
2mm	M3	0.5	303 Stainless Steel	Viton® Fluoroelastomer Rubber	250 psi @ 72° F	-40° to 500° F	Single	00000000	00000
4mm	M3	0.5	303 Stainless Steel	Viton® Fluoroelastomer Rubber	250 psi @ 72° F	-40° to 500° F	Single	00000000	00000

Straight Adapters, Tube × Female Threaded Pipe

Metric Threads
For Tube ID	Thread Size	Material	Max. Pressure	Temp. Range, °F	Number of Barbs		Each
1mm	M3	303 Stainless Steel	250 psi @ 72° F	-40° to 500° F	Single	00000000	000000
2mm	M3	303 Stainless Steel	250 psi @ 72° F	-40° to 500° F	Single	00000000	00000
4mm	M3	303 Stainless Steel	250 psi @ 72° F	-40° to 500° F	Single	00000000	00000

Stainless Steel Push-to-Connect Tube Fittings for Chemicals

Metric and UN/UNF
(SAE Straight) Male
Threads with Gasket

For Use With: Alcohol, Bleach, Lubricated Air, Nitric Acid, Sodium Carbonate, Sulfuric Acid
Temperature Range: 0° to 175° F
Tubing: Use with firm or hard (Durometer 80A-60D) FEP, polyethylene, or PTFE plastic

Fittings are 316 stainless steel, which has excellent chemical resistance and is more durable than plastic. Also known as instant fittings, they connect to tubing with a push, and an internal gripping ring and O-ring hold the tubing tight. Instead of a release ring, these fittings have a release sleeve that slides back to disconnect tubing.

Metric and UN/UNF (SAE Straight) male threads have a gasket to protect against leaks. UN/UNF (SAE Straight) threads are also known as O-ring boss threads.

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

Straight Adapters, Tube × Male Threaded Pipe

Front

Metric and UN/UNF
(SAE Straight) Male
Threads with Gasket

Metric Threads
For Tube OD	Thread Size	Thread Pitch, mm	Material	Gasket Material	Max. Pressure		Each
4mm	M3	0.5	316 Stainless Steel	Viton® Fluoroelastomer Rubber	345 psi @ 72° F	00000000	000000
6mm	M3	0.5	316 Stainless Steel	Viton® Fluoroelastomer Rubber	345 psi @ 72° F	00000000	00000

90° Elbow Adapters, Tube × Male Threaded Pipe

Metric and UN/UNF
(SAE Straight) Male
Threads with Gasket

Metric Threads
For Tube OD	Thread Size	Thread Pitch, mm	Material	Gasket Material	Max. Pressure		Each
4mm	M3	0.5	316 Stainless Steel	Viton® Fluoroelastomer Rubber	345 psi @ 72° F	0000000	000000

Compression Fittings for Stainless Steel Tubing

A single sleeve (ferrule) bites into tubing as you tighten the nut, creating a strong seal. The nut and sleeve are included. Fittings are also known as flareless fittings or bite fittings. Use them in low- to medium-pressure applications.

303 stainless steel fittings and 360 brass fittings have good corrosion resistance. Metric and UN/UNF (SAE Straight) male threads have a gasket to protect against leaks.

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

Straight Adapters, Tube × Male Threaded Pipe

Metric and UN/UNF
(SAE Straight) Male
Threads with Gasket

For Use With:
303 Stainless Steel, 316 Stainless Steel with 17-4 PH Stainless Steel Sleeve, and 360 Brass: Air, Water, Hydraulic Fluid
316 Stainless Steel: Air, Cutting Oil, Ethyl Alcohol, Fuel Oil, Gasoline, Hydraulic Fluid, Isopropyl Alcohol, Mineral Oil, Natural Gas, Steam, Water
Temperature Range: See table
Tubing: See table
Specifications Met:
316 Stainless Steel: ISO 8434, DIN 2353
316 Stainless Steel with 17-4 PH Stainless Steel Sleeve: SAE J514

For Tube
OD	Wall Thick.	Thread Size	Material	Gasket Material	Sleeve Material	Max. Pressure	Temp. Range, °F	For Tube Material	For Tube Fabrication		Each
Metric Threads
1/16"	0.01"	M3 × 0.5 mm	303 Stainless Steel	Fluoroelastomer Rubber	303 Stainless Steel	2,000 psi @ 72° F	-4° to 400°	304 Stainless Steel, 316 Stainless Steel	Seamless, Welded	0000000	000000

Right-Angle Flow Rectangular Manifolds

Distribute air or fluid to multiple locations from a single supply source with these manifolds. They are also known as headers. They have mounting holes, so you can mount from the top or side.

Aluminum manifolds are the industry standard for the most common types of applications. They are lighter in weight than other metal manifolds and have good corrosion resistance. Anodized aluminum manifolds have a black finish and nickel-plated aluminum manifolds have a shiny finish.

Use a plug (sold separately) to close off any unused inlets and outlets.

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

Anodized Aluminum—Metric Inlets × Metric Outlets

Outlets on One Side

For Use With: Air, Water, Hydraulic Fluid
Temperature Range: See table
Maximum Pressure:
Air: 1,000 psi @ 72° F
Water: 1,000 psi @ 72° F
Hydraulic Fluid: See table
Maximum Vacuum: 27 in. of Hg @ 72° F

	Inlet		Outlet
No. of Outlets	Thread Size	Thread Pitch, mm	Thread Size	Thread Pitch, mm	Lg., mm	Wd., mm	Ht., mm	Outlet Ctr.-to-Ctr., mm	Color	Maximum Pressure, Hydraulic Fluid	Temperature Range, °F		Each
Outlets on One Side—Standard Outlet Spacing
2	M5	0.8	M3	0.5	44	19	19	19	Black	3,000 psi @ 72° F	-65° to 250°	00000000	000000
3	M5	0.8	M3	0.5	60	19	19	16	Black	3,000 psi @ 72° F	-65° to 250°	00000000	00000
6	M5	0.8	M3	0.5	120	19	19	19	Black	3,000 psi @ 72° F	-65° to 250°	00000000	00000

Plugs

Aluminum—Metric
Thread Size	Thread Pitch, mm	Drive	Pressure Class	Max. Pressure		Each
M3	0.5	External Hex	150	150 psi @ 72° F	00000000	00000
M5	0.8	External Hex	__	1,000 psi @ 72° F	00000000	0000

Low-Profile Hex Manifolds

When you’re short on vertical space, these manifolds are a good fit—they have outlets on the side instead of on top, so they have a lower profile than rectangular manifolds. Use them to distribute air, water, or hydraulic fluid to five locations from a single supply source. Manifolds have mounting holes, so you can mount from the top.

Anodized aluminum manifolds are the industry standard for the most common types of applications. They are lighter in weight than other metal manifolds and have good corrosion resistance. These manifolds are anodized for a black finish.

316 stainless steel manifolds have excellent corrosion resistance and can handle fuel, gasoline, coolant and other harsh substances.

Use a plug (sold separately) to close off any unused inlets and outlets.

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

Anodized Aluminum—Metric Inlets × Metric Outlets

For Use With: Air, Water, Hydraulic Fluid
Temperature Range: -10° to 200° F
Maximum Pressure: 1,000 psi @ 72° F
Maximum Vacuum: 27 in. of Hg @ 72° F

	Inlet		Outlet
No. of Outlets	Thread Size	Thread Pitch, mm	Thread Size	Thread Pitch, mm	Wd., mm	Ht., mm	Outlet Spacing	Color		Each
5	M6	1	M3	0.5	45	19	Standard	Black	00000000	000000

316 Stainless Steel—Metric Inlets × Metric Outlets

For Use With: Air, Water, Hydraulic Fluid, Alcohol, Coolant, Cutting Oil, Deionized Water, Diesel Fuel, Fuel Oil, Gasoline, Mineral Oil, Nitrogen
Temperature Range: -100° to 500° F
Maximum Pressure: 3,500 psi @ 72° F
Maximum Vacuum: 27 in. of Hg @ 72° F

	Inlet		Outlet
No. of Outlets	Thread Size	Thread Pitch, mm	Thread Size	Thread Pitch, mm	Wd., mm	Ht., mm	Outlet Spacing		Each
5	M6	1	M3	0.5	45	19	Standard	00000000	0000000

Plugs

			External Hex Drive
Thread Size	Thread Pitch, mm	Max. Pressure	Pressure Class		Each
Aluminum—Metric
M3	0.5	150 psi @ 72° F	150	00000000	00000
M6	1	150 psi @ 72° F	150	00000000	0000