M3 Nipples | McMaster-Carr

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	System of Measurement System of Measurement

Inch

Metric

	Thread Size Thread Size	Show

	Thread Size Thread Size	Hide

	Thread Type Thread Type

Metric

NPT

	Type Type


Pipe	Adapter

	Length Length

	OD OD

1/8"

	ID ID

0.063"

	Material Material

Aluminum

Brass

Stainless Steel

	Shape Shape

	Straight

	Connection Type Connection Type


Pipe	Tube

	Connection Style Connection Style

Threaded

Barbed

	For Tube ID For Tube ID

1 mm

2mm

4mm

	For Use With For Use With

	Gender Gender

Male

	Maximum Pressure Maximum Pressure

	Wall Thickness Wall Thickness

0.03"

	Threading Threading

	Fully Threaded

	Hex Width Hex Width

	Barbed Connection Type Barbed Connection Type

	Clamp On
	Push On

	Pipe Size Pipe Size

1/16

1/8

1/4

	Fabrication Fabrication

Machined

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant

RoHS Compliant with
Exemptions

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

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17 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.

Miniature Medium-Pressure Stainless Steel Threaded Pipe Fittings

When space is at a premium choose these compact fittings. Though small in size, they have the strength to handle medium-pressure applications. Fittings are stainless steel for very good corrosion resistance.

Metric, BSPP, and UN/UNF (SAE Straight) male threads have a gasket to protect against leaks. Made from fluoroelastomer, these gaskets resist chemicals, including benzene, butyl alcohol, and ethylene glycol. 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, Male

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

For Use With: Air, Natural Gas, Oil, Steam, Water
Specifications Met: ASTM A314, ASTM A320, ASTM A582

					303 Stainless Steel
Pipe Size	Thread Size	Max. Pressure	Max. Steam Pressure	Gasket Material		Each
NPT Male × Metric Male
1/16	M3 × 0.5 mm	500 psi @ 72° F	100 psi @ 350° F	Fluoroelastomer Rubber	00000000	000000
1/8	M3 × 0.5 mm	500 psi @ 72° F	100 psi @ 350° F	Fluoroelastomer Rubber	00000000	00000
1/4	M3 × 0.5 mm	500 psi @ 72° F	100 psi @ 350° F	Fluoroelastomer Rubber	00000000	00000

High-Pressure Plated Brass Threaded Pipe Nipples and Pipe

The plating on this pipe creates a shiny finish and provides extra protection in corrosive environments. It has the strength to handle high-pressure applications.

Nickel-plated brass pipe provides better corrosion resistance than unplated brass.

Fully threaded pipe is also known as a close nipple; it is threaded on each end to the center.

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

Fully Threaded

For Use With: Air, Natural Gas, Oil, Water

				Nickel-Plated Brass
Thread Size	Lg.	Hex Wd.	Max. Pressure		Each
Metric
M3	3/8"	3/16"	1,080 psi @ 72° F	00000000	00000

Miniature Medium-Pressure Aluminum Threaded Pipe Fittings

Their small size makes these miniature fittings a good choice for cramped, confined spaces. They are designed to handle medium-pressure applications. Fittings are aluminum, which is lightweight with 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, Male

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

For Use With: Air, Oil, Water
Specifications Met: ASME B1.20.1, ASTM B241

NPT Male × Metric Male
Pipe Size	Thread Size	Max. Pressure		Each
1/16	M3 × 0.5 mm	150 psi @ 72° F	00000000	00000
1/8	M3 × 0.5 mm	150 psi @ 72° F	00000000	0000
1/4	M3 × 0.5 mm	150 psi @ 72° F	00000000	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 that forms a tight seal.

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

Straight Adapters, Tube × Male Threaded Pipe

Metric 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	00000
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

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

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