Nipples for Ammonia | McMaster-Carr

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Acetic Acid (White Vinegar)

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705

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316/316L Stainless Steel

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17 Products

About Pipe and Fittings

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

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 705 (3,000 psi @ 72° F)	1/4	NPT	2 1/2"	Ammonia	79215A427	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 705	Female	1.125"-14	UNS	Right Hand	3,000 psi @ 72° F	Ammonia	79215A418	000000

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.

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 705	1.125"-14	UNS	Right Hand	3,000 psi @ 72° F	Ammonia	79215A418	000000

Ultra-High-Polish Gasket Fittings for Stainless Steel Tubing

For Use With: Ammonia, Argon, Butane, Carbon Dioxide, Chloride, Fluoride, Fluorocarbon, Germane, Halide, Helium, Hydrogen, Krypton, Laser Gas, Natural Gas, Neon, Nitrogen, Oxygen, Silane, Sulfur Hexafluoride, Tungsten Hexafluoride, Xenon
Temperature Range: -420° to 1000° F
Tubing: Use with 316/316L stainless steel
Compatible With: Swagelok® VCR

Polished to at least a 15 Ra finish on the inside, these fittings have an ultra-smooth interior surface that helps prevent contamination. Also known as ultra-high-purity fittings, they’re packed in a Class 100 clean room, cleaned, and double bagged. They are commonly used in semiconductor applications. Fittings use a metal gasket (sold separately), which generates fewer particles than a rubber gasket and creates a strong seal in high-pressure and ultra-high-vacuum applications. Fittings are 316 stainless steel for excellent corrosion resistance.

To assemble, place a gasket between the gasket ends before gently rotating the female-threaded fitting onto the male-threaded fitting. Tighten until 1/8 of a turn past finger tight.

Choose threaded fittings to attach directly to other fittings.

Straight Adapters, Male Threaded Gasket Fitting × Male Threaded Pipe

NPT Threads
For Tube OD	Pipe Size	Material	Max. Pressure	Max. Vacuum	Interior Smoothness, Ra	Environmental Rating		Each
1/2"	1/2	316L Stainless Steel	3,500 psi @ 72° F	10 ^-11 torr @ 72° F	5	Fed. Std. Class 100	9066N12	000000

Nuts

Male

Female

Male
For Tube OD	Nut Material	Max. Pressure	Max. Vacuum	Lg.		Each
1/2"	316L Stainless Steel	3,500 psi @ 72° F	10 ^-11 torr @ 72° F	13/16"	9066N24	000000
Female
1/2"	316L Stainless Steel	3,500 psi @ 72° F	10 ^-11 torr @ 72° F	7/8"	9066N26	00000

Gaskets

Gasket

Gasket with
Retaining
Tabs

Hard and heat resistant, stainless steel gaskets can be used in a wider range of applications than nickel gaskets such as carbon monoxide and ozone. However, they’re harder to tighten than nickel gaskets, and they’ll wear down sealing surfaces more quickly.

Silver-plated stainless steel gaskets are softer than unfinished stainless steel gaskets, so they won’t wear down sealing surfaces as much, and they’re easier to tighten. However, they oxidize when exposed to air, and silver particles might flake off during assembly.

Nickel gaskets are softer than stainless steel gaskets, so they won’t wear down sealing surfaces as much, and they’re easier to tighten. They’re reactive to carbon monoxide and ozone, so they shouldn’t be used with those chemicals.

Gaskets with retaining tabs stay in place during installation, so you don’t have to hold the gasket while fastening fittings together. This also means they’re less likely to scratch or nick your fittings by rotating during installation.

316L Stainless Steel Gasket
For Tube OD	Max. Vacuum	Environmental Rating		Each
1/2"	10 ^-11 torr @ 72° F	Fed. Std. Class 100	9066N33	00000
Silver-Plated 316L Stainless Steel Gasket
1/2"	10 ^-11 torr @ 72° F	Fed. Std. Class 100	9066N456	0000
Nickel Gasket with Retaining Tabs
1/2"	10 ^-11 torr @ 72° F	Fed. Std. Class 100	9066N452	0000
316L Stainless Steel Gasket with Retaining Tabs
1/2"	10 ^-11 torr @ 72° F	Fed. Std. Class 100	9066N458	0000

Quick-Disconnect Tube Couplings for Chemicals

Couplings consist of a plug and a socket (sold separately) that join with a latch, so you can frequently connect and disconnect your line. To connect, insert the plug into the socket; to disconnect, press the latch on the socket and remove the plug. Plugs and sockets are polypropylene, which has excellent chemical, impact, and abrasion resistance.

Plugs and sockets with shut-off have a valve to stop the flow when the coupling is separated so fluid won’t spill from your line.

Note: For a complete coupling, order a plug and a socket with the same coupling size.

Plugs, Male Threaded Pipe

For Use With: Ammonia, Ethanol, Phosphoric Acid (70%), Sodium Carbonate
Temperature Range: 32° to 160° F

						Open Flow		With Shut-Off
Pipe Size	Coupling Size	Plug OD	Material	Color	Max. Pressure		Each		Each
NPT Threads
1/8	1/8	5/16"	Polypropylene Plastic	Beige	120 psi @ 72° F	51545K65	00000	51545K75	000000
1/4	1/4	7/16"	Polypropylene Plastic	Beige	120 psi @ 72° F	51545K66	00000	51545K76	00000
3/8	3/8	3/4"	Polypropylene Plastic	Gray	60 psi @ 72° F	51545K41	0000	51545K51	00000
1/2	3/8	3/4"	Polypropylene Plastic	Gray	60 psi @ 72° F	51545K42	0000	51545K52	00000