Plugs for Oxygen | McMaster-Carr

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	Pipe Size Pipe Size

1/8
1/4
3/8
1/2
3/4
1
2
2 1/2
3
4

	Thread Type Thread Type

BSPT

NPT

UNF

	Type Type


Adapter	Cap

Flange	Plug

	Material Material

Brass

Stainless Steel

	Drive Style Drive Style


Hex	External Hex

	System of Measurement System of Measurement

Inch

	Drive Size Drive Size

	For Use With For Use With	Show

Oxygen

	For Use With For Use With	Hide

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

Alcohol-Based Solvents

Hydrochloric Acid (30%)

Wire, Cable, and Cords

	Maximum Pressure Maximum Pressure

	Length Length

	Shape Shape

	Cap/Plug
	Straight

	Gender Gender

Male

Female

	Body Shape Body Shape

	Hex

	Connection Style Connection Style

Threaded

Flanged

	Connection Type Connection Type


Hose	Pipe

	Specifications Met Specifications Met

ASME

DIN

ISO

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

DFARS Specialty Metals
COTS-Exempt

	Maximum Steam Pressure Maximum Steam Pressure

1,500 psi @ 300° F

	Plug Construction Plug Construction

Hollow

	Fabrication Fabrication

Machined

	Thread Fabrication Thread Fabrication

Rolled

	Connection Connection

Inlet

Outlet

	Maximum Temperature Maximum Temperature

100° to 249° F

	Minimum Temperature Minimum Temperature

-65° F

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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.

Precision Extreme-Pressure Brass Threaded Pipe Fittings

Also known as instrumentation fittings, these have the most precise threads and the tightest tolerances of all the brass pipe fittings we offer. The male threads are rolled for excellent strength in extreme-pressure applications. Fittings are brass for good corrosion resistance.

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

Caps

For Use With: Air, Argon, Natural Gas, Nitrogen Gas, Oil, Oxygen, Steam, Water
Specifications Met: ASME B1.20.1, ASME B31.1, ASME B31.3

NPT Female
Pipe Size	Max. Pressure	Max. Steam Pressure		Each
1/8	4,000 psi @ 72° F	1,500 psi @ 300° F	00000000	00000
1/4	4,300 psi @ 72° F	1,500 psi @ 300° F	00000000	0000
3/8	3,500 psi @ 72° F	1,500 psi @ 300° F	00000000	0000
1/2	3,600 psi @ 72° F	1,500 psi @ 300° F	00000000	00000
3/4	3,000 psi @ 72° F	1,500 psi @ 300° F	00000000	00000

Plugs with Hex Drive

For Use With: Air, Argon, Natural Gas, Nitrogen Gas, Oil, Oxygen, Steam, Water
Specifications Met: ASME B1.20.1, ASME B31.1, ASME B31.3

NPT Male
Pipe Size	Drive Size	Max. Pressure	Max. Steam Pressure		Each
1/8	3/16"	5,600 psi @ 72° F	1,500 psi @ 300° F	00000000	00000
1/4	1/4"	4,100 psi @ 72° F	1,500 psi @ 300° F	00000000	0000
3/8	5/16"	4,000 psi @ 72° F	1,500 psi @ 300° F	00000000	00000

Plugs with External Hex Drive

For Use With: Air, Argon, Natural Gas, Nitrogen Gas, Oil, Oxygen, Steam, Water
Specifications Met:
NPT: ASME B1.20.1, ASME B31.1, ASME B31.3
BSPT: ASME B31.3, DIN 2999, ISO 7.1

NPT Male
Pipe Size	Plug Construction	Max. Pressure	Max. Steam Pressure		Each
1/8	Hollow	5,600 psi @ 72° F	1,500 psi @ 300° F	0000000	00000
1/4	Hollow	4,100 psi @ 72° F	1,500 psi @ 300° F	0000000	0000
3/8	Hollow	4,000 psi @ 72° F	1,500 psi @ 300° F	0000000	0000
1/2	Hollow	3,900 psi @ 72° F	1,500 psi @ 300° F	0000000	0000
3/4	Hollow	3,800 psi @ 72° F	1,500 psi @ 300° F	0000000	00000
BSPT Male
1/8	Hollow	3,200 psi @ 72° F	1,500 psi @ 300° F	00000000	00000
1/4	Hollow	3,300 psi @ 72° F	1,500 psi @ 300° F	00000000	00000
3/8	Hollow	2,600 psi @ 72° F	1,500 psi @ 300° F	00000000	00000
1/2	Hollow	2,400 psi @ 72° F	1,500 psi @ 300° F	00000000	00000
3/4	Hollow	2,300 psi @ 72° F	1,500 psi @ 300° F	00000000	00000
1	Hollow	2,200 psi @ 72° F	1,500 psi @ 300° F	00000000	00000

Brass and Bronze Unthreaded Pipe Flanges

Bolt these flanges to equipment or to another same-size, flat-surface flange with a gasket (sold separately). They have good corrosion resistance.

Cap flanges are also known as blind flanges.

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

Caps

Front

Flat Surface on Back

For Use With: Air, Argon, Natural Gas, Nitrogen Gas, Oil, Oxygen, Water
Class: 150
Specifications Met: ASME B16.24
Pipe Nipples and Pipe: Use Schedule 40 brass

			Bolt Hole
Pipe Size	Flange OD	For Bolt Dia.	Dia.	No. of	Bolt Circle Dia.	Max. Pressure	Material		Each
2	6"	1/2"	3/4"	4	4 3/4"	225 psi @ 72° F	Brass	00000000	0000000
2 1/2	7"	1/2"	3/4"	4	5 1/2"	225 psi @ 72° F	Brass	00000000	000000
3	7 1/2"	1/2"	3/4"	4	6"	225 psi @ 72° F	Brass	00000000	000000
4	9"	1/2"	3/4"	8	7 1/2"	225 psi @ 72° F	Brass	00000000	000000

Threaded Hose Fittings for Compressed Gas

Use these fittings to connect welding hose to pressure regulators and torches. They are also known as CGA (Compressed Gas Association) fittings. Fittings are brass for good corrosion resistance.

Note: Fittings have a CGA number that corresponds to a specific type of gas. Choose a fitting with the same CGA number as your tank and other system components.

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

Caps, Female Hose

Maximum Pressure: 200 psi @ 72° F
Maximum Temperature: 120° F

Brass
CGA Number	Trade Size	Thread Size	Thread Type	Thread Direction	Chain Lg.	For Use With		Each
022	B	9/16"-18	UN/UNF (CGA)	Right Hand	6"	Oxygen	0000000	00000

Quick-Install Pressure Test Fittings

NPT Female Inlet ×
NPT Male
Outlet Adapter

NPT Female Inlet × NPT
Male Outlet Adapter with
Intermittent Swivel

NPT Male Inlet ×
NPT Female
Outlet Adapter

NPT Male Inlet Plug

Thread these fittings onto your testing equipment by hand for a secure connection in testing applications—no tools, tape, or sealant required. Use them with gauges and other equipment as a temporary connection. When pressure is applied, the O-ring on the outlet presses against the testing equipment, creating a tight seal.

Adapters with intermittent swivel rotate 360° until tightened for easy installation.

NPT Female Inlet × NPT Male Outlet Adapter
Pipe Size	Max. Pressure, psi	Temperature Range, °F	Gasket Material	For Use With		Each
416 Stainless Steel
1/8 × 1/8	5,000	-65° to 212°	Polyurethane Rubber	Air, Argon, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Hydraulic Fluid (Petroleum Based), Natural Gas, Nitrogen, Oxygen, Water	0000000	000000
1/4 × 1/4	5,000	-65° to 212°	Polyurethane Rubber	Air, Argon, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Hydraulic Fluid (Petroleum Based), Natural Gas, Nitrogen, Oxygen, Water	0000000	00000
3/8 × 3/8	4,000	-65° to 212°	Polyurethane Rubber	Air, Argon, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Hydraulic Fluid (Petroleum Based), Natural Gas, Nitrogen, Oxygen, Water	0000000	000000
1/2 × 1/2	4,000	-65° to 212°	Polyurethane Rubber	Air, Argon, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Hydraulic Fluid (Petroleum Based), Natural Gas, Nitrogen, Oxygen, Water	0000000	000000
3/4 × 3/4	4,000	-65° to 212°	Polyurethane Rubber	Air, Argon, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Hydraulic Fluid (Petroleum Based), Natural Gas, Nitrogen, Oxygen, Water	0000000	000000
1 × 1	4,000	-65° to 212°	Polyurethane Rubber	Air, Argon, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Hydraulic Fluid (Petroleum Based), Natural Gas, Nitrogen, Oxygen, Water	0000000	000000
NPT Female Inlet × NPT Male Outlet Adapter with Intermittent Swivel
416 Stainless Steel
1/8 × 1/8	5,000	-65° to 212°	Polyurethane Rubber	Air, Argon, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Hydraulic Fluid (Petroleum Based), Natural Gas, Nitrogen, Oxygen, Water	0000000	000000
1/4 × 1/4	5,000	-65° to 212°	Polyurethane Rubber	Air, Argon, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Hydraulic Fluid (Petroleum Based), Natural Gas, Nitrogen, Oxygen, Water	0000000	000000
3/8 × 3/8	4,000	-65° to 212°	Polyurethane Rubber	Air, Argon, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Hydraulic Fluid (Petroleum Based), Natural Gas, Nitrogen, Oxygen, Water	0000000	000000
1/2 × 1/2	4,000	-65° to 212°	Polyurethane Rubber	Air, Argon, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Hydraulic Fluid (Petroleum Based), Natural Gas, Nitrogen, Oxygen, Water	0000000	000000
3/4 × 3/4	4,000	-65° to 212°	Polyurethane Rubber	Air, Argon, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Hydraulic Fluid (Petroleum Based), Natural Gas, Nitrogen, Oxygen, Water	0000000	000000
1 × 1	4,000	-65° to 212°	Polyurethane Rubber	Air, Argon, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Hydraulic Fluid (Petroleum Based), Natural Gas, Nitrogen, Oxygen, Water	0000000	000000
NPT Male Inlet × NPT Female Outlet Adapter
416 Stainless Steel
1/8 × 1/8	5,000	-65° to 212°	Polyurethane Rubber	Air, Argon, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Hydraulic Fluid (Petroleum Based), Natural Gas, Nitrogen, Oxygen, Water	0000000	00000
1/4 × 1/4	5,000	-65° to 212°	Polyurethane Rubber	Air, Argon, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Hydraulic Fluid (Petroleum Based), Natural Gas, Nitrogen, Oxygen, Water	0000000	00000
3/8 × 3/8	4,000	-65° to 212°	Polyurethane Rubber	Air, Argon, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Hydraulic Fluid (Petroleum Based), Natural Gas, Nitrogen, Oxygen, Water	0000000	000000
1/2 × 1/2	4,000	-65° to 212°	Polyurethane Rubber	Air, Argon, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Hydraulic Fluid (Petroleum Based), Natural Gas, Nitrogen, Oxygen, Water	0000000	000000
3/4 × 3/4	4,000	-65° to 212°	Polyurethane Rubber	Air, Argon, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Hydraulic Fluid (Petroleum Based), Natural Gas, Nitrogen, Oxygen, Water	0000000	000000
1 × 1	4,000	-65° to 212°	Polyurethane Rubber	Air, Argon, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Hydraulic Fluid (Petroleum Based), Natural Gas, Nitrogen, Oxygen, Water	0000000	000000
NPT Male Inlet Plug
416 Stainless Steel
1/8	5,000	-65° to 212°	Polyurethane Rubber	Air, Argon, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Hydraulic Fluid (Petroleum Based), Natural Gas, Nitrogen, Oxygen, Water	0000000	00000
1/4	5,000	-65° to 212°	Polyurethane Rubber	Air, Argon, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Hydraulic Fluid (Petroleum Based), Natural Gas, Nitrogen, Oxygen, Water	0000000	00000
3/8	4,000	-65° to 212°	Polyurethane Rubber	Air, Argon, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Hydraulic Fluid (Petroleum Based), Natural Gas, Nitrogen, Oxygen, Water	0000000	00000
1/2	4,000	-65° to 212°	Polyurethane Rubber	Air, Argon, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Hydraulic Fluid (Petroleum Based), Natural Gas, Nitrogen, Oxygen, Water	0000000	000000
3/4	4,000	-65° to 212°	Polyurethane Rubber	Air, Argon, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Hydraulic Fluid (Petroleum Based), Natural Gas, Nitrogen, Oxygen, Water	0000000	000000
1	4,000	-65° to 212°	Polyurethane Rubber	Air, Argon, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Hydraulic Fluid (Petroleum Based), Natural Gas, Nitrogen, Oxygen, Water	0000000	000000