CGA 677 Fittings | McMaster-Carr

Filter by

CGA Number

677

System of Measurement

Inch

Maximum Pressure @ Temperature

For Use With

Connects To

Material

Gender

Fitting Type

Length

Thread Direction

Pipe Size

Thread Type

Thread Size

Shape

DFARS Specialty Metals

Exempt

Not Compliant

Export Control Classification Number (ECCN)

Maximum Temperature

Minimum Temperature

REACH

RoHS

U.S.–Mexico–Canada Agreement (USMCA) Qualifying

Tighten With

Fitting Connection

2 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 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.

316 stainless steel nuts have excellent corrosion resistance.

Nuts with left-hand threads are identified with a notch.

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

316 Stainless Steel
Number	Thread Size	Thread Type	Thread Direction	Max. Pressure	For Use With		Each
CGA 677	1.035"-14	NGO	Left Hand	6,400 psi @ 72° F	Argon, Helium, Krypton, Neon, Nitrogen, Xenon	79215A728	000000

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 is designed to sit inside a threaded nut (sold separately) so you can make a threaded connection.

316 stainless steel nipples have excellent corrosion resistance.

Nipples, Tank × Male Regulator

Maximum Pressure: See table
Maximum Temperature: 120° F

	Regulator Connection
For Number (Max. Pressure)	Pipe Size	Thread Type	Lg.	For Use With		Each
316 Stainless Steel—Tighten With Wrench
CGA 677 (6,400 psi @ 72° F)	1/4	NPT	2 1/2"	Argon, Helium, Krypton, Neon, Nitrogen, Xenon	79215A729	000000

Nuts

Female Nut

Maximum Pressure: See table
Maximum Temperature: 120° F

316 Stainless Steel
Number	Gender	Thread Size	Thread Type	Thread Direction	Max. Pressure	For Use With		Each
CGA 677	Female	1.035"-14	NGO	Left Hand	6,400 psi @ 72° F	Argon, Helium, Krypton, Neon, Nitrogen, Xenon	79215A728	000000