3mm Tube Fittings | McMaster-Carr

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	System of Measurement System of Measurement

Inch

Metric

	For Tube OD For Tube OD	Show

3mm

	For Tube OD For Tube OD	Hide

	Thread Size Thread Size

10-32

	Thread Type Thread Type

Metric

NPT

UN/UNF (SAE Straight)

	Thread Pitch Thread Pitch

0.5 mm

0.8 mm

	Shape Shape


Straight	90° Elbow

Tee	Cap/Plug

	Type Type


Adapter	Connector

Reducer	Sleeve

Nut	Cap

	Connection Style Connection Style

	Connection Type Connection Type


Tube	Pipe

	For Use With For Use With

	For Tube Material For Tube Material

	Gender Gender

Female

Male

	Length Length

	Material Material

	Push-to-Connect Type Push-to-Connect Type


Standard	Tube Stem

	Maximum Pressure Maximum Pressure

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

RoHS Compliant

RoHS Compliant with
Exemptions

	Vacuum Rating Vacuum Rating

Standard

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

	Minimum Temperature Minimum Temperature

-250° F or less

-49° to 0° F

	Maximum Temperature Maximum Temperature

Less than 200° F

500° to 999° F

1,000° F or greater

	O-Ring Material O-Ring Material

Rubber

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

REACH Compliant

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39 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.

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

Temperature Range: 0° to 170° F
Tubing: Use with firm (Durometer 95A-45D) polyethylene plastic or polyurethane rubber
Specifications Met: ISO 14743, except 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.

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
3mm	M5	0.8	Nickel-Plated Brass	Buna-N Rubber	Plastic	Black	290 psi @ 72° F	00000000	00000

Straight Adapters, Tube Stem × Tube

Fittings with tube stem insert into the push-to-connect end of another fitting in place of a length of tubing.

Tube Stem OD	For Tube OD	Material	Color	Release Ring Color	Max. Pressure		Each
4mm	3mm	Nylon Plastic	Black	Black	290 psi @ 72° F	00000000	00000

Straight Reducers, Tube

For Tube OD (A)	For Tube OD (B)	Material	Color	Release Ring Color	Max. Pressure		Each
4mm	3mm	Nylon Plastic	Black	Black	290 psi @ 72° F	00000000	000000

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
3mm	M5	0.8	Nylon Plastic	Nickel-Plated Brass	Buna-N Rubber	Black	Black	290 psi @ 72° F	00000000	0000

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, except plugs and straight connectors are 32° 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. 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

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

Metric Threads
For Tube OD	Thread Size	Thread Pitch, mm	Material	Gasket Material	Release Type	Max. Pressure		Each
3mm	M3	0.5	Nickel-Plated Brass	Buna-N Rubber	Sleeve	230 psi @ 72° F	00000000	000000
3mm	M5	0.8	Nickel-Plated Brass	Buna-N Rubber	Sleeve	230 psi @ 72° F	00000000	00000
UN/UNF (SAE Straight) Threads
3mm	10-32	__	Nickel-Plated Brass	Buna-N Rubber	Sleeve	230 psi @ 72° F	00000000	00000

Straight Connectors, Tube

For Tube OD	Material	Release Type	Max. Pressure		Each
3mm	Nickel-Plated Brass	Sleeve	230 psi @ 72° F	00000000	000000

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.

Metric Threads
For Tube OD	Thread Size	Thread Pitch, mm	Material	Gasket Material	Release Type	Max. Pressure		Each
3mm	M3	0.5	Nickel-Plated Brass	Buna-N Rubber	Sleeve	230 psi @ 72° F	00000000	000000
3mm	M5	0.8	Nickel-Plated Brass	Buna-N Rubber	Sleeve	230 psi @ 72° F	00000000	00000
UN/UNF (SAE Straight) Threads
3mm	10-32	__	Nickel-Plated Brass	Buna-N Rubber	Sleeve	230 psi @ 72° F	00000000	00000

Yor-Lok Fittings for Stainless Steel Tubing

A nut with two sleeves (ferrules) gives these fittings extra gripping power. The sleeves bite into tubing as you tighten the nut, creating a strong seal. Also known as instrumentation fittings, they are made to tight tolerances for use in high-precision applications. They are compatible with Swagelok®, Let-Lok, and A-Lok fittings.

316 stainless steel fittings have excellent corrosion resistance.

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

Straight Adapters, Tube × Male Threaded Pipe

For Use With:
Inch:
NPT and BSPT Threads: Air, Cutting Oil, Fuel Oil, Gasoline, Hydraulic Fluid, Mineral Oil, Natural Gas, Steam, Water
BSPP Threads: Air, Cutting Oil, Fuel Oil, Gasoline, Mineral Oil, Water
UN/UNF (SAE Straight) Threads: Air, Cutting Oil, Fuel Oil, Gasoline, Hydraulic Fluid, Mineral Oil
Metric:
NPT, BSPT, and UN/UNF (SAE Straight) Threads: Air, Cutting Oil, Fuel Oil, Gasoline, Hydraulic Fluid, Mineral Oil, Natural Gas, Steam, Water
Tubing:
Inch:
NPT and UN/UNF (SAE Straight) Threads: Use with welded or seamless 304/304L or 316/316L stainless steel that meets ASTM A213, ASTM A249, or ASTM A269
BSPP and BSPT Threads: Use with seamless 304 or 316 stainless steel that meets ASTM A269
Metric:
NPT and BSPT Threads: Use with welded or seamless 304/304L or 316/316L stainless steel that meets ASTM A213, ASTM A249, or ASTM A269
UN/UNF (SAE Straight) Threads: Use with welded or seamless 304/304L or 316/316L stainless steel that meets ASTM A213, ASTM A249, or ASTM A269

For Tube
OD	Wall Thick.	Pipe Size	Material	Max. Pressure	Temp. Range, °F		Each
NPT Threads
3mm	0.5mm	1/16	316 Stainless Steel	9,700 psi @ 72° F	-420° to 1200°	00000000	000000
3mm	0.5mm	1/8	316 Stainless Steel	4,000 psi @ 72° F	-420° to 1200°	00000000	00000
3mm	0.5mm	1/4	316 Stainless Steel	8,000 psi @ 72° F	-420° to 1200°	00000000	00000
3mm	0.5mm	3/8	316 Stainless Steel	7,800 psi @ 72° F	-420° to 1200°	0000000	00000

Straight Adapters, Tube × Female Threaded Pipe

For Use With: Air, Cutting Oil, Fuel Oil, Gasoline, Hydraulic Fluid, Mineral Oil, Natural Gas, Steam, Water
Tubing:
Inch:
NPT Threads: Use with welded or seamless 304/304L or 316/316L stainless steel that meets ASTM A213, ASTM A249, or ASTM A269
BSPP and BSPT Threads: Use with seamless 304 or 316 stainless steel that meets ASTM A269
Metric:
NPT Threads: Use with welded or seamless 304/304L or 316/316L stainless steel that meets ASTM A213, ASTM A249, or ASTM A269

For Tube
OD	Wall Thick.	Pipe Size	Material	Max. Pressure	Temp. Range, °F		Each
NPT Threads
3mm	0.5mm	1/8	316 Stainless Steel	4,000 psi @ 72° F	-420° to 1200°	00000000	000000

Straight Adapters, Tube Stem × Tube

For Use With: Air, Cutting Oil, Fuel Oil, Gasoline, Hydraulic Fluid, Mineral Oil, Natural Gas, Steam, Water
Tubing: Use with welded or seamless 304/304L or 316/316L stainless steel that meets ASTM A213, ASTM A249, or ASTM A269

Fittings with tube stem insert into the tube end of another fitting in place of a length of tubing.

	For Tube
Tube Stem OD	OD	Wall Thick.	Material	Max. Pressure	Temp. Range, °F		Each
1/8"	3mm	0.028" to 0.035"	316 Stainless Steel	8,500 psi @ 72° F	-420° to 1200°	00000000	000000
1/4"	3mm	0.028" to 0.065"	316 Stainless Steel	4,100 psi @ 72° F	-420° to 1200°	00000000	00000

Straight Adapters, Tube × Butt-Weld Pipe

For Use With: Air, Cutting Oil, Fuel Oil, Gasoline, Hydraulic Fluid, Mineral Oil, Natural Gas, Steam, Water
Tubing: Use with welded or seamless 304/304L or 316/316L stainless steel that meets ASTM A213, ASTM A249, or ASTM A269

For Tube
OD	Wall Thick.	Pipe Size	Material	Max. Pressure	Temp. Range, °F		Each
3mm	0.5mm	1/8	316 Stainless Steel	9,700 psi @ 72° F	-420° to 1200°	00000000	000000
3mm	0.5mm	1/4	316 Stainless Steel	9,700 psi @ 72° F	-420° to 1200°	00000000	00000

Straight Connectors, Tube

For Use With: Air, Cutting Oil, Fuel Oil, Gasoline, Hydraulic Fluid, Mineral Oil, Natural Gas, Steam, Water
Tubing: Use with welded or seamless 304/304L or 316/316L stainless steel that meets ASTM A213, ASTM A249, or ASTM A269

For Tube
OD	Wall Thick.	Material	Max. Pressure	Temp. Range, °F		Each
3mm	0.5mm	316 Stainless Steel	4,000 psi @ 72° F	-420° to 1200°	00000000	000000

90° Elbow Adapters, Tube × Male Threaded Pipe

For Use With:
NPT and BSPT Threads: Air, Cutting Oil, Fuel Oil, Gasoline, Hydraulic Fluid, Mineral Oil, Natural Gas, Steam, Water
BSPP Threads: Air, Cutting Oil, Fuel Oil, Gasoline, Mineral Oil, Water
UN/UNF (SAE Straight) Threads: Air, Cutting Oil, Fuel Oil, Gasoline, Hydraulic Fluid, Mineral Oil
Tubing:
NPT and UN/UNF (SAE Straight) Threads: Use with welded or seamless 304/304L or 316/316L stainless steel that meets ASTM A213, ASTM A249, or ASTM A269
BSPP and BSPT Threads: Use with seamless 304 or 316 stainless steel that meets ASTM A269

For Tube
OD	Wall Thick.	Pipe Size	Material	Max. Pressure	Temp. Range, °F		Each
NPT Threads
3mm	0.5mm	1/8	316 Stainless Steel	6,500 psi @ 72° F	-420° to 1200°	0000000	000000

Tee Connectors, Tube

For Use With: Air, Cutting Oil, Fuel Oil, Gasoline, Hydraulic Fluid, Mineral Oil, Natural Gas, Steam, Water
Tubing: Use with welded or seamless 304/304L or 316/316L stainless steel that meets ASTM A213, ASTM A249, or ASTM A269

For Tube
OD	Wall Thick.	Material	Max. Pressure	Temp. Range, °F		Each
3mm	0.5mm	316 Stainless Steel	4,000 psi @ 72° F	-420° to 1200°	00000000	000000

Caps

Cap For Tubing

Cap For Fitting

For Use With: Air, Cutting Oil, Fuel Oil, Gasoline, Hydraulic Fluid, Mineral Oil, Natural Gas, Steam, Water
Tubing: Use with welded or seamless 304/304L or 316/316L stainless steel that meets ASTM A213, ASTM A249, or ASTM A269

Caps for tubing have a nut and a sleeve so you can close off the end of your tubing in place of a fitting. Caps for fittings replace the nut and sleeve of an existing fitting.

For Tube
OD	Wall Thick.	Material	Max. Pressure	Temp. Range, °F		Each
For Tubing
3mm	0.5mm	316 Stainless Steel	9,700 psi @ 72° F	-420° to 1200°	00000000	000000
For Fitting
3mm	0.5mm	316 Stainless Steel	9,700 psi @ 72° F	-420° to 1200°	00000000	00000

Nuts

For Tube
OD	Wall Thick.	Nut Material	Max. Pressure	Temp. Range, °F		Each
1/8"	0.035"	316 Stainless Steel	6,000 psi @ 72° F	-420° to 1200°	00000000	00000
1/4"	0.035"	316 Stainless Steel	4,000 psi @ 72° F	-420° to 1200°	00000000	0000
3mm	0.5mm	316 Stainless Steel	4,000 psi @ 72° F	-420° to 1200°	00000000	0000

Front and Back Sleeves

For Tube
OD	Wall Thick.	Sleeve Material	Max. Pressure	Temp. Range, °F		Each
1/8"	0.035"	316 Stainless Steel	6,000 psi @ 72° F	-420° to 1200°	00000000	00000
1/4"	0.035"	316 Stainless Steel	4,000 psi @ 72° F	-420° to 1200°	00000000	0000
3mm	0.5mm	316 Stainless Steel	4,000 psi @ 72° F	-420° to 1200°	00000000	0000

PTFE Sleeves

For Tube OD	Sleeve Material	Max. Pressure	Temp. Range, °F		Each
1/8"	PTFE Plastic	Not Rated	-65° to 350°	00000000	00000

Front and Back Sleeves for Yor-Lok Fittings for Stainless Steel Tubing

For Use With: Air, Cutting Oil, Fuel Oil, Gasoline, Hydraulic Fluid, Mineral Oil, Natural Gas, Steam, Water
Temperature Range: -420° to 1200° F
Tubing: Use with seamless or welded 304/304L or 316/316L stainless steel that meets ASTM A213, ASTM A249, or ASTM A269
Compatible With: Let-Lok, Parker A-Lok, Swagelok®

Use these sleeves with Yor-Lok nuts and fittings to create an extra-strong seal on stainless steel tubing. Sleeves are 316 stainless steel for excellent corrosion resistance. They are also known as ferrules.

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

For Tube
OD	Wall Thick.	Sleeve Material	Max. Pressure		Each
3mm	0.5mm	316 Stainless Steel	4,000 psi @ 72° F	00000000	00000

Nuts for Yor-Lok Fittings for Stainless Steel Tubing

For Use With: Air, Cutting Oil, Fuel Oil, Gasoline, Hydraulic Fluid, Mineral Oil, Natural Gas, Steam, Water
Temperature Range: -420° to 1200° F
Tubing: Use with seamless or welded 304/304L or 316/316L stainless steel that meets ASTM A213, ASTM A249, or ASTM A269
Compatible With: Let-Lok, Parker A-Lok, Swagelok®

Use these nuts with Yor-Lok sleeves and fittings to create an extra-strong seal on stainless steel tubing. They are 316 stainless steel for excellent corrosion resistance.

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

For Tube
OD	Wall Thick.	Nut Material	Max. Pressure		Each
3mm	0.5mm	316 Stainless Steel	4,000 psi @ 72° F	00000000	00000

Yor-Lok Fittings for Steel Tubing

For Use With: Air, Cutting Oil, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Mineral Oil
Tubing: Use with seamless steel
Specifications Met: See table

These fittings include a nut with two sleeves (ferrules) for extra gripping power. The sleeves bite into tubing as you tighten the nut, creating a strong seal. Also known as instrumentation fittings, they are made to tight tolerances for use in high-precision applications. Fittings are zinc-plated steel for fair corrosion resistance. They are compatible with Swagelok®, Let-Lok, and A-Lok fittings.

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

Straight Adapters, Tube × Male Threaded Pipe

For Tube
OD	Wall Thick.	Pipe Size	Material	Max. Pressure	Temp. Range, °F	Specifications Met		Each
NPT Threads
3mm	0.8mm	1/8	Zinc-Plated Steel	10,000 psi @ 72° F	-20° to 800°	ASME B31.3	00000000	00000
3mm	0.8mm	1/4	Zinc-Plated Steel	10,000 psi @ 72° F	-20° to 800°	ASME B31.3	00000000	0000

Nuts

For Tube
OD	Wall Thick.	Nut Material	Max. Pressure	Temp. Range, °F	Specifications Met		Each
3mm	0.8mm	Zinc-Plated Steel	10,000 psi @ 72° F	-20° to 800°	ASME B31.3	00000000	00000

Front and Back Sleeves

For Tube
OD	Wall Thick.	Front Sleeve Material	Back Sleeve Material	Max. Pressure	Temp. Range, °F	Specifications Met		Each
3mm	0.8mm	Zinc-Plated Steel	316 Stainless Steel	10,000 psi @ 72° F	-20° to 800°	ASME B31.3	00000000	00000

Nuts for Yor-Lok Fittings for Steel Tubing

For Use With: Air, Mineral Oil, Fuel Oil, Gasoline, Diesel Fuel, Cutting Oil, Hydraulic Fluid
Temperature Range: See table
Tubing: Use with seamless steel
Specifications Met: See table
Compatible With: Let-Lok, Parker A-Lok, Swagelok®

Use these nuts with Yor-Lok sleeves and fittings to create an extra-strong seal on steel tubing. They are zinc-plated steel for fair corrosion resistance.

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

For Tube
OD	Wall Thick.	Nut Material	Max. Pressure	Temp. Range, °F	Specifications Met		Each
3mm	0.8mm	Zinc-Plated Steel	10,000 psi @ 72° F	-20° to 800°	ASME B31.3	00000000	00000

Front and Back Sleeves for Yor-Lok Fittings for Steel Tubing

For Use With: Air, Mineral Oil, Fuel Oil, Gasoline, Diesel Fuel, Cutting Oil, Hydraulic Fluid
Temperature Range: -20° to 800° F
Tubing: Use with seamless steel
Specifications Met: ASME B31.3
Compatible With: Let-Lok, Parker A-Lok, Swagelok®

Use these sleeves with Yor-Lok nuts and fittings to create an extra-strong seal on steel tubing. They are also known as ferrules.

Zinc-plated steel sleeves have fair corrosion resistance. 316 stainless steel sleeves have excellent corrosion resistance.

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

For Tube
OD	Wall Thick.	Front Sleeve Material	Back Sleeve Material	Max. Pressure		Each
3mm	0.8mm	Zinc-Plated Steel	316 Stainless Steel	10,000 psi @ 72° F	00000000	00000