Aluminum Tube Fitting Nuts

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12 Products

About Measuring Fittings

Measure the threaded ends of your fittings to identify their pipe size, thread size, schedule, and thread type. Then, find compatible components.

Nuts for 37° Flared Fittings for Aluminum Tubing

For Use With: Air, Coolant, Gasoline, Hydraulic Fluid, Water
Temperature Range: -60° to 350° F
Tubing: Use with seamless aluminum

Use these nuts with a sleeve and fitting to provide a tight metal-to-metal seal on aluminum tubing that is flared to 37°. Nuts are aluminum, which is lightweight with good corrosion resistance.

For Tube OD	Nut Material	Max. Pressure		Each
3/16"	Anodized 2024 Aluminum	3,000 psi @ 72° F	2227K57	00000
1/4"	Anodized 2024 Aluminum	3,000 psi @ 72° F	2227K61	0000
3/8"	Anodized 2024 Aluminum	3,000 psi @ 72° F	2227K62	0000
1/2"	Anodized 2024 Aluminum	3,000 psi @ 72° F	2227K63	0000
5/8"	Anodized 2024 Aluminum	3,000 psi @ 72° F	2227K66	0000
3/4"	Anodized 2024 Aluminum	3,000 psi @ 72° F	2227K64	0000
1"	Anodized 2024 Aluminum	1,500 psi @ 72° F	2227K65	00000
1 1/4"	Anodized 2024 Aluminum	1,500 psi @ 72° F	2227K59	00000

Nuts for High-Pressure Nipples for Compressed Gas

Slide a high-pressure hose nipple for compressed gas into one of these nuts to connect a pipe to the inlet of a pressure regulator. They are also known as CGA (Compressed Gas Association) nuts and inlet nuts.

Brass nuts have good corrosion resistance and are softer than 316 stainless steel nuts, so they're easier to thread together. Aluminum-plated brass nuts have better corrosion and wear resistance than unplated brass.

Note: Nuts have a CGA, BS, or DIN number that corresponds to a specific type of gas. Choose a nut with the same number as your tank and other system components.

Female

Female Nut

Maximum Pressure: See table
Maximum Temperature: 120° F, except DIN 477 No. 9: 250° F

Aluminum-Plated Brass
Number	Thread Size	Thread Type	Thread Direction	Max. Pressure	For Use With		Each
CGA 170	9/16"-18	UN/UNF (CGA)	Right Hand	3,000 psi @ 72° F	Air, Argon, Butane, Carbon Dioxide, Helium, Krypton, Methane, Natural Gas, Neon, Nitrogen, Oxygen, Propane, Propylene	79215A311	000000
CGA 180	5/8"-18	UN/UNF (CGA)	Right Hand	3,000 psi @ 72° F	Air, Argon, Butane, Carbon Dioxide, Helium, Krypton, Methane, Natural Gas, Neon, Nitrogen, Oxygen, Propane, Propylene	79215A313	00000
DIN 477 No. 6	W 21.8	Metric	Right Hand	3,000 psi @ 72° F	Argon, Carbon Dioxide, Cyclobutane, Dichlorotetrafluoroethane, Helium, Krypton, Sulfur Hexafluoride, Trifluoroethane, Xenon	79215A328	00000

Male

Male Nut

Maximum Pressure: See table
Maximum Temperature: 120° F, except DIN 477 No. 12: 250° F

Aluminum-Plated Brass
Number	Pipe Size	Thread Type	Thread Direction	Max. Pressure	For Use With		Each
BS 341 No. 3	5/8	BSPP	Right Hand	3,000 psi @ 72° F	Air, Argon, Helium, Krypton, Neon, Nitrogen, Oxygen, Perfluoropropane	79215A326	000000