Couplings for Helium | McMaster-Carr

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	Type Type


Connector	Adapter

Reducer	Nut

	For Use With For Use With	Show

	For Use With For Use With	Hide

Warning: Products have one, but not necessarily all, of the selected characteristics.

Abrasive Materials

Ammonium Hydroxide

Anhydrous Ammonia

Boron Trifluoride

Calcium Chloride

Carbon Monoxide

Carbonyl Sulfide

Chips and Shavings

Deionized Water

Dichlorotetrafluoroethane

Ethylene Glycol

Flammable Gases

Formic Acid (25%)

Hydraulic Fluid

Hydrochloric Acid

Hydrochloric Acid (30%)

Hydrofluoric Acid

Hydrogen Bromide

Hydrogen Chloride

Hydrogen Fluoride

Hydrogen Iodide

Hydrogen Sulfide

Isopropyl Alcohol

Liquid Nitrogen

Magnesium Chloride

Medical Gas Mixtures

Methyl Chloride

Methyl Fluoride

Mineral Spirits

Nitric Acid (65%)

Nitrogen Trifluoride

Nonabrasive Slurry

Organic Solvents

Oxygen Mixtures

Perfluoropropane

Pharmaceuticals

Phosphoric Acid

Plastic Pellets

Propylene Glycol

Refrigerant Gases

Refrigerant R-12

Refrigerant R-22

Refrigerant R-134a

Refrigerant R-404A

Refrigerant R-407C

Refrigerant R-502

Silicon Tetrafluoride

Sodium Carbonate

Sodium Carbonate
(20% in Water)

Sodium Chloride

Sodium Hydroxide

Sulfur Hexafluoride

Sulfur Tetrafluoride

Sulfuric Acid (95%)

Trifluoroethane

Tungsten Hexafluoride

	Gender Gender

	Connection Style Connection Style

	Material Material

Stainless Steel

	Thread Type Thread Type

	Pipe Size Pipe Size

	Shape Shape

	Straight

	System of Measurement System of Measurement

	For Tube OD For Tube OD

	CGA Number CGA Number

022
032
033
170
180
320
346
350
500
510
540
555
580
590
677
680
695
702
703

	Maximum Pressure Maximum Pressure

200 psi @ 72° F

500 psi @ 72° F

2,300 psi @ 72° F

2,700 psi @ 72° F

2,800 psi @ 72° F

3,000 psi @ 72° F

3,500 psi @ 72° F

4,000 psi @ 72° F

4,350 psi @ 72° F

4,500 psi @ 72° F

5,100 psi @ 72° F

5,200 psi @ 72° F

5,500 psi @ 72° F

7,500 psi @ 72° F

	Thread Size Thread Size

	Connection Type Connection Type


Pipe	Hose

Tube

	For Tube Material For Tube Material

316/316L Stainless Steel

304/304L Stainless Steel

316Ti Stainless Steel

321 Stainless Steel

	Length Length

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

DFARS Specialty Metals
COTS-Exempt

	Maximum Temperature Maximum Temperature

100° to 249° F

250° to 499° F

1,000° F or greater

	Minimum Temperature Minimum Temperature

-250° F or less

	Connects To Connects To

	Maximum Vacuum Maximum Vacuum

1 × 10^-13 torr @
72° F

1 × 10^-8 torr @
72° F

10^-11 torr @
72° F

	Thread Direction Thread Direction

	Nut Material Nut Material

316 Stainless Steel

316/316L Stainless Steel

316L Stainless Steel

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265 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.

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Compressed Gas Hose Fittings

Threaded Hose Fittings for Compressed Gas

Use these CGA fittings to connect welding hose to pressure regulators and torches.

Barbed Hose Fittings for Compressed Gas

Commonly used in low-pressure welding applications, these fittings connect downstream of your pressure regulator. Slide the barbed end into hose and secure with a crimp-on hose ferrule.

Nuts for High-Pressure Nipples for Compressed Gas

Nuts for High-Pressure Nipples for Compressed Gas

These nuts attach to high-pressure nipples for compressed gas so you can connect your tank to the inlet of a pressure regulator.

High-Pressure Threaded Fittings for Compressed Gas

Designed to handle high-pressure welding applications, these CGA fittings are commonly used to connect pressure regulators to compressed gas tanks or cylinders.

High-Pressure Nipples for Compressed Gas

Commonly used in high-pressure welding applications, these nipples connect your tank to the inlet of a pressure regulator. One side has a threaded pipe end and the other side has a rounded end that sits inside a threaded nut to make a threaded connection.

Tube Fittings for Stainless Steel Tubing

Vibration-Resistant Compression
Fittings for Stainless Steel Tubing

Vibration-Resistant Compression Fittings for Stainless Steel Tubing

Instead of a metal sleeve (ferrule), these fittings have a rubber sleeve that cushions tubing and absorbs vibration to maintain a tight seal, even when connected to large pumps.

Nuts for Vibration-Resistant Compression
Fittings for Stainless Steel Tubing

Nuts for Vibration-Resistant Compression Fittings for Stainless Steel Tubing

Pair these nuts with vibration-resistant compression sleeves and fittings for a strong seal on stainless steel tubing.

Ultra-High-Polish Gasket Fittings
for Stainless Steel Tubing

Polished to a 15 Ra and under finish, these fittings have a mirror smooth interior. They are also known as ultra-high-purity fittings.

Ultra-High-Polish Gasket Adapters
for Stainless Steel Tubing

Ultra-High-Polish Gasket Adapters for Stainless Steel Tubing

Vibration-Resistant Ultra-High-Polish
Gasket Fittings for Stainless Steel Tubing

Fittings have two anti-torque rings that compress the gasket to prevent rotation and reduce particle generation in high-vibration applications.

Through-Wall Fittings for High-Vacuum Chambers

Also known as feedthroughs, these fittings transfer liquids, cryogenic liquids, or gasses into high-vacuum chambers for coating, cooling, and leak-testing applications without losing vacuum pressure.

The quick brown fox jumped over the lazy dog. Pedestal (35" Ht. x 4" Wd. x 4" Dp.)