M30 Couplings | McMaster-Carr

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	System of Measurement System of Measurement

Inch

Metric

	Thread Size Thread Size	Show

M30

	Thread Size Thread Size	Hide

	Thread Type Thread Type

Metric

	Thread Pitch Thread Pitch

2 mm

3.5 mm

	Gender Gender


Female	Male

	Type Type

	Adapter

	Connection Style Connection Style

Threaded

Barbed

	Connection Type Connection Type


Pipe	Hose

	Material Material

Stainless Steel

Steel

	Shape Shape

	Straight

	Nut Type Nut Type


Coupling	Hex

	For Use With For Use With

Hydraulic Fluid

	Barbed Connection Type Barbed Connection Type

	Push On

	Length Length

2 9/32"

90 mm

	Width Width

46 mm

	For Hose ID For Hose ID

3/4"

	Dash Size Dash Size

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

DFARS Specialty Metals
COTS-Exempt

DFARS Specialty Metals
Compliant

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

RoHS Compliant

RoHS Compliant with
Exemptions

	Finish Finish

Black Oxide

Zinc Plated

	Threading Threading

	Fully Threaded

	For Hose Manufacturer Series For Hose Manufacturer Series

801

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

REACH Compliant

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8 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.

About Nuts, Materials, and Finishes

Push-On Barbed Hose Fittings for Hydraulic Fluid

These fittings have sharp barbs to grip rubber push-on hose with no clamps or ferrules required. The more you pull on the fittings, the tighter the hose will grip. Use them in low-pressure hydraulic applications up to 350 psi. Also known as hose nipples, they adapt a barbed end to a threaded end, so you can connect to pumps, cylinders, and other equipment in your hydraulic system. Fittings are zinc-plated steel, which has excellent strength and durability. Fittings have fair corrosion resistance.

Fittings that swivel until tightened rotate 360° for easy installation.

Note: To ensure proper connection, the barbed end has to be pushed in all the way, with the hose end concealed by the ring.

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

Straight Adapters (Swivels Until Tightened), Hose × Metric Female Threaded Pipe

Maximum Pressure: See table
Maximum Vacuum: 28 in. of Hg @ 72° F
Temperature Range: -40° to 155° F
For Hose Manufacturer Series: Parker 801

		Thread		Ring Stop
For Hose ID	Dash Size	Size	Pitch, mm	Material	Color	Max. Pressure	Manufacturer Series		Each
Zinc-Plated Steel
3/4"	12	M30	2	Plastic	Yellow	300 psi @ 72° F	Parker 82	00000000	000000

Metric Low-Strength Steel Coupling Nuts

Often referred to as extension nuts, use these to connect and extend threaded rods. They're about half the strength of medium-strength steel coupling nuts for use in light duty fastening applications.

Zinc-plated steel coupling nuts resist corrosion in wet environments.

Black-oxide steel coupling nuts have a dark surface color and are mildly corrosion resistant in dry environments.

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

Thread						Each
Size	Pitch, mm	Lg., mm	Wd., mm	Specifications Met		1-9	10-Up
Zinc-Plated Steel
M30	3.5	90	46	DIN 6334	000000000	000000	000000
Black-Oxide Steel
M30	3.5	90	46	DIN 6334	000000000	00000	00000

Metric Medium-Strength Steel Coupling Nuts—Class 8

Often referred to as extension nuts, use these to connect and extend threaded rods. They're comparable in strength to Class 8.8 bolts.

Zinc-plated steel coupling nuts resist corrosion in wet environments.

Black-oxide steel coupling nuts have a dark surface color and are mildly corrosion resistant in dry environments.

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

Thread						Each
Size	Pitch, mm	Lg., mm	Wd., mm	Specifications Met		1-9	10-Up
Zinc-Plated Steel—Class 8
M30	3.5	90	46	DIN 6334	000000000	000000	000000
Black-Oxide Steel—Class 8
M30	3.5	90	46	DIN 6334, ASME B18.2.2	000000000	00000	00000

Metric High-Strength Steel Coupling Nuts—Class 10

Often referred to as extension nuts, use these to connect and extend threaded rods. Made from Class 10 steel, they're about 25% stronger than medium-strength steel coupling nuts and comparable in strength to Class 10.9 bolts.

Steel nuts are best for dry environments, since moisture will cause them to rust. They are ready for painting or welding.

Zinc-plated steel nuts are corrosion resistant in wet environments.

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

Thread						Each
Size	Pitch, mm	Lg., mm	Wd., mm	Specifications Met		1-9	10-Up
Steel—Class 10
M30	3.5	90	46	DIN 6334	000000000	000000	000000
Zinc-Plated Steel—Class 10
M30	3.5	90	46	DIN 6334	000000000	000000	00000

Metric 18-8 Stainless Steel Coupling Nuts

Stainless Steel

Made from 18-8 stainless steel, these metric coupling nuts have good chemical resistance and may be mildly magnetic. Also known as extension nuts, use them to connect and extend threaded rods.

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

Thread						Each
Size	Pitch, mm	Lg., mm	Wd., mm	Specifications Met		1-9	10-Up
18-8 Stainless Steel
M30	3.5	90	46	DIN 6334, ASME B18.2.2	000000000	000000	000000