Oxygen Pressure Gauges | McMaster-Carr

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	For Use With For Use With

Liquid Oxygen

Oxygen

	Connection Location Connection Location


Bottom	Center Back	Lower Back

	Pipe Size Pipe Size

1/4

1/2

	Thread Type Thread Type

NPT

	System of Measurement System of Measurement

Inch

	Dial Diameter Dial Diameter

2 1/2"

	Scale Type Scale Type


Single	Dual

	Scale Scale

kPa

psi

	Case Material Case Material

Stainless Steel

Brass

	Dial Type Dial Type

	Dry

	Measures Measures

Pressure

	Connection Material Connection Material

Brass

	Connection Type Connection Type


Pipe	Tube

	Connection Style Connection Style

Threaded

Quick Clamp

	Display Type Display Type

	Dial

	Minimum Environment Temperature Minimum Environment Temperature

-40° F

	Gender Gender

Male

Female

	Maximum Environment Temperature Maximum Environment Temperature

140° F

	Minimum Process Temperature Minimum Process Temperature

-40° F

	Accuracy Scale Accuracy Scale

Mid Scale

Full Scale

	Maximum Process Temperature Maximum Process Temperature

140° F

	Accuracy Grade Accuracy Grade

	Body Material Body Material

Brass

Stainless Steel

Brass/Steel

	Lens Material Lens Material

Plastic

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33 Products

About Pressure Gauges

About Pipe Size

About Gas Regulators

Single Scale With Bottom Connection

Dual Scale With Bottom Connection

Dual Scale With Center Back Connection

Dual Scale With Lower Back Connection

Bottom Connection

Center Back Connection

Lower Back Connection

Use these gauges with pumps, filters, regulators, and in process lines to monitor the pressure of compressed gas. Mount them with the dial face upright. Gauges for use with acetylene can also be used in welding applications.

Gauges with brass case are cleaned to meet ASME B40.1, Level IV for oxygen service.

Gauges with 304 stainless steel case are cleaned and bagged to meet ASME B40.1, Level IV for oxygen service.

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

Brass Case with Brass Connection—Single Scale (psi)

For Use With: Air, Acetylene, Carbon Dioxide, and Oxygen
Accuracy: ±2% Mid Scale (Grade B)

Available Pressure Ranges
Pressure Range, psi	Graduation Marks, psi	Numeric Increments, psi
0 to 30	1	5
0 to 60	1	10
0 to 100	2	20
0 to 200	5	40
0 to 400	10	50
0 to 600	10	100
0 to 1,000	20	200
0 to 2,000	50	400
0 to 3,000	50	500
0 to 4,000	100	500

					Bottom Connection
Dial Diameter	Pipe Size	Environment Temp. Range, °F	Process Temp. Range, °F	Mounting Orientation		Each
NPT Male
2"	1/4	-40° to 140°	-40° to 140°	Upright	0000000	000000
2 1/2"	1/4	-40° to 140°	-40° to 140°	Upright	0000000	00000

304 Stainless Steel Case with Brass Connection—Dual Scale (psi, kPa)

For Use With: Oxygen
Accuracy: ±1% Mid Scale (Grade A); except
4" Dial Dia.: ±1% Full Scale (Grade 1A)

		Available Pressure Ranges
		Bottom and Center Back Connections				Lower Back Connection
Pressure Range		Graduation Marks		Numeric Increments		Graduation Marks		Numeric Increments
psi	kPa	psi	kPa	psi	kPa	psi	kPa	psi	kPa
2 1/2" Dial Diameter
0 to 15	0 to 102	0.2	2	3	20	__	__	__	__
0 to 30	0 to 205	0.5	5	5	50	__	__	__	__
0 to 100	0 to 680	2	10	20	100	__	__	__	__
0 to 200	0 to 1,350	5	50	50	200	__	__	__	__
0 to 300	0 to 2,050	5	50	50	500	__	__	__	__
0 to 600	0 to 4,100	10	100	100	1,000	__	__	__	__
4" Dial Diameter
0 to 15	0 to 103	0.2	1	3	10	0.2	1	3	10
0 to 30	0 to 206	0.5	2	5	20	0.5	2	5	20
0 to 100	0 to 680	1	10	10	100	1	10	10	100
0 to 200	0 to 1,360	2	20	20	200	2	20	20	200
0 to 300	0 to 2,060	5	20	50	200	5	20	50	200
0 to 600	0 to 4,100	10	50	100	500	10	100	100	1,000

Bottom Connection
Dial Diameter	Pipe Size	Environment Temp. Range, °F	Process Temp. Range, °F	Mounting Orientation		Each
NPT Male
2 1/2"	1/4	-40° to 140°	-40° to 140°	Upright	0000000	000000
4"	1/4	-40° to 140°	-40° to 140°	Upright	0000000	00000
Center Back Connection
NPT Male
2 1/2"	1/4	-40° to 140°	-40° to 140°	Upright	0000000	00000
Lower Back Connection
NPT Male
4"	1/4	-40° to 140°	-40° to 140°	Upright	0000000	00000

Gauge Guards

316 Stainless Steel Guard

316 Stainless Steel Guard With Drain Port

Also known as isolators or diaphragm seals, these protect gauges from corrosive process media. Fill guards with ISO Grade 32 hydraulic oil (not included) before use.

316 stainless steel guards provide excellent corrosion and chemical resistance and can handle higher temperatures and pressures than plastic guards.

Guards with drain port allow you to remove process media.

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

Pipe Connections
Inlet	Outlet	Gasket Material	For Use With	Min. Pressure, psi	Max. Pressure	Max. Temp., °F	Ht.		Each
316 Stainless Steel Body
1/4 NPT Female	1/4 NPT Female	316 Stainless Steel	Acetylene, Air, Ammonia, Argon, Bleach, Boric Acid, Carbon Dioxide, Deionized Water, Diesel Fuel, Ethanol, Ethyl Alcohol, Gasoline, Hydraulic Fluid, Hydrogen, Liquid Nitrogen, Natural Gas, Nitrogen, Oxygen, Refrigerant, Salt Water, Steam, Water	60	2,500 psi @ 72° F	300°	1 1/2"	0000000	0000000
1/2 NPT Female	1/4 NPT Female	316 Stainless Steel	Acetylene, Air, Ammonia, Argon, Bleach, Boric Acid, Carbon Dioxide, Deionized Water, Diesel Fuel, Ethanol, Ethyl Alcohol, Gasoline, Hydraulic Fluid, Hydrogen, Liquid Nitrogen, Natural Gas, Nitrogen, Oxygen, Refrigerant, Salt Water, Steam, Water	60	2,500 psi @ 72° F	300°	1 1/2"	0000000	000000
1/2 NPT Female	1/2 NPT Female	316 Stainless Steel	Acetylene, Air, Ammonia, Argon, Bleach, Boric Acid, Carbon Dioxide, Deionized Water, Diesel Fuel, Ethanol, Ethyl Alcohol, Gasoline, Hydraulic Fluid, Hydrogen, Liquid Nitrogen, Natural Gas, Nitrogen, Oxygen, Refrigerant, Salt Water, Steam, Water	60	2,500 psi @ 72° F	300°	1 1/2"	0000000	000000
316 Stainless Steel Body with 1/4 NPT Female Drain Port
1/4 NPT Female	1/4 NPT Female	316 Stainless Steel	Acetylene, Air, Ammonia, Argon, Bleach, Boric Acid, Carbon Dioxide, Deionized Water, Diesel Fuel, Ethanol, Ethyl Alcohol, Gasoline, Hydraulic Fluid, Hydrogen, Liquid Nitrogen, Natural Gas, Nitrogen, Oxygen, Refrigerant, Salt Water, Steam, Water	60	2,500 psi @ 72° F	300°	2"	0000000	000000
1/2 NPT Female	1/4 NPT Female	316 Stainless Steel	Acetylene, Air, Ammonia, Argon, Bleach, Boric Acid, Carbon Dioxide, Deionized Water, Diesel Fuel, Ethanol, Ethyl Alcohol, Gasoline, Hydraulic Fluid, Hydrogen, Liquid Nitrogen, Natural Gas, Nitrogen, Oxygen, Refrigerant, Salt Water, Steam, Water	60	2,500 psi @ 72° F	300°	2"	0000000	000000
1/2 NPT Female	1/2 NPT Female	316 Stainless Steel	Acetylene, Air, Ammonia, Argon, Bleach, Boric Acid, Carbon Dioxide, Deionized Water, Diesel Fuel, Ethanol, Ethyl Alcohol, Gasoline, Hydraulic Fluid, Hydrogen, Liquid Nitrogen, Natural Gas, Nitrogen, Oxygen, Refrigerant, Salt Water, Steam, Water	60	2,500 psi @ 72° F	300°	2"	0000000	000000

Sanitary Gauge Guards

Keeping corrosive substances from touching pressure gauges used in food-processing and pharmaceutical plants, these guards have a sanitary design. Made of 316 stainless steel, they won’t rust from frequent washdowns with harsh cleaners and sanitizers. They have continuously-welded seams and polished surfaces, so there aren’t any pits for bacteria to grow in. Removing them for cleaning and maintenance is easy thanks to their quick-clamp connection, which is sometimes called a tri-clamp.

Also known as isolators and diaphragm seals, these guards have a 316 stainless steel gasket to shield the pressure gauges from corrosion. Before use, fill the guards with fluid such as glycerin or silicone that’s suitable for food contact.

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

	Outlet Quick-Clamp Tube Connection
Inlet Pipe Connection	For Tube OD	Flange OD	Gasket Material	For Use With	Minimum Pressure, psi	Maximum Pressure	Maximum Temperature	Height	Interior Smoothness, Ra		Each
316 Stainless Steel Body
1/4 NPT Female	1 1/2"	1.984"	316 Stainless Steel	Acetylene, Air, Ammonia, Beverage, Boric Acid, Carbon Dioxide, Diesel Fuel, Ethanol, Food, Gasoline, Hydraulic Fluid, Hydrogen, Oxygen, Pharmaceuticals, Wastewater, Water	30	Not Rated	Not Rated	1 3/8"	32	0000000	0000000
1/4 NPT Female	2"	2.516"	316 Stainless Steel	Acetylene, Air, Ammonia, Beverage, Boric Acid, Carbon Dioxide, Diesel Fuel, Ethanol, Food, Gasoline, Hydraulic Fluid, Hydrogen, Oxygen, Pharmaceuticals, Wastewater, Water	30	Not Rated	Not Rated	1 1/8"	32	0000000	000000
1/2 NPT Female	1 1/2"	1.984"	316 Stainless Steel	Acetylene, Air, Ammonia, Beverage, Boric Acid, Carbon Dioxide, Diesel Fuel, Ethanol, Food, Gasoline, Hydraulic Fluid, Hydrogen, Oxygen, Pharmaceuticals, Wastewater, Water	30	Not Rated	Not Rated	1 3/8"	32	0000000	000000
1/2 NPT Female	2"	2.516"	316 Stainless Steel	Acetylene, Air, Ammonia, Beverage, Boric Acid, Carbon Dioxide, Diesel Fuel, Ethanol, Food, Gasoline, Hydraulic Fluid, Hydrogen, Oxygen, Pharmaceuticals, Wastewater, Water	30	Not Rated	Not Rated	1 1/8"	32	0000000	000000

Tank-Mount Pressure-Regulating
Valves for Air and Inert Gas

For Use With: See Table
Temperature Range: -20° to 120° F

These valves automatically reduce a high inlet pressure from compressed gas tanks to a lower, stable outlet pressure. All have Compressed Gas Association (CGA) numbered inlet fittings for secure connections to compressed gas tanks. Choose a valve with the same CGA number as your tank and other system components. Valves have a gauge to monitor outlet pressure and a gauge to monitor inlet pressure from the tank.

Choose a valve with a maximum outlet pressure that’s approximately twice your application’s normal operating pressure. Your operating pressure should never exceed 75% of the valve’s maximum outlet pressure.

Single-stage valves reduce pressure in one step, which causes the outlet pressure to fluctuate slightly as you empty the tank. They’re best for applications where a constant outlet pressure isn’t critical.

Two-stage valves progressively reduce pressure over two steps for more consistent outlet pressure at all times. They’re often used in applications that require a constant outlet pressure regardless of the tank level.

Valves with a brass body have a longer service life than valves with a brass and steel body.

Valves with a stainless steel diaphragm can withstand harsh environments.

Single-Stage Valves

Male Outlet × Female Inlet Single-Stage Valve With T-Handle

Male Outlet × Female Inlet Single-Stage Valve With Knob

Inlet				Outlet				Material
CGA Number	Location	Thread Direction	Pressure Gauge Range, psi	Location	Thread Direction	Pressure Range, psi	Pressure Adjustment Method	Body	Seal	Diaphragm		Each
For Use With Oxygen
9/16"-18 UNF Male Outlet × NGO Female Inlet
CGA 540	Side	Right Hand	0 to 4,000	Side	Left Hand	0 to 50	Knob	Brass	PTFE	Neoprene	00000000	0000000
CGA 540	Side	Right Hand	0 to 4,000	Side	Right Hand	0 to 50	T-Handle	Brass	PTFE	Neoprene	00000000	000000
CGA 540	Side	Right Hand	0 to 4,000	Side	Right Hand	0 to 50	T-Handle	Brass	PTFE	Stainless Steel	00000000	000000
CGA 540	Side	Right Hand	0 to 4,000	Side	Right Hand	0 to 125	T-Handle	Brass	PTFE	Rubber	0000000	000000
CGA 540	Side	Right Hand	0 to 4,000	Side	Right Hand	0 to 125	T-Handle	Brass	PTFE	Stainless Steel	0000000	000000
CGA 540	Side	Right Hand	0 to 4,000	Side	Right Hand	0 to 145	Knob	Brass/Steel	PTFE	Rubber	0000000	000000
CGA 540	Side	Right Hand	0 to 4,000	Side	Right Hand	0 to 200	T-Handle	Brass	PTFE	Rubber	000000	000000
CGA 540	Side	Right Hand	0 to 4,000	Side	Right Hand	0 to 200	T-Handle	Brass	PTFE	Stainless Steel	00000000	000000

Two-Stage Valves

Female Outlet × Female Inlet Two-Stage Valve With T-Handle

Male Outlet × Female Inlet Two-Stage Valve With T-Handle

Inlet				Outlet				Material
CGA Number	Location	Thread Direction	Pressure Gauge Range, psi	Location	Thread Direction	Pressure Range, psi	Pressure Adjustment Method	Body	Seal	Diaphragm		Each
For Use With Oxygen
1/4 NPT Female Outlet × NGO Female Inlet
CGA 540	Side	Right Hand	0 to 4,000	Side	Right Hand	0 to 250	T-Handle	Brass	PTFE	Stainless Steel	0000000	0000000
1/4 NPT Male Outlet × NGO Female Inlet
CGA 540	Side	Right Hand	0 to 4,000	Side	Right Hand	0 to 250	T-Handle	Brass	PTFE	Neoprene	0000000	000000
9/16"-18 UNF Male Outlet × NGO Female Inlet
CGA 540	Side	Right Hand	0 to 4,000	Side	Right Hand	0 to 50	T-Handle	Brass	PTFE	Neoprene	00000000	000000
CGA 540	Side	Right Hand	0 to 4,000	Side	Right Hand	0 to 50	T-Handle	Brass	PTFE	Stainless Steel	00000000	000000
CGA 540	Side	Right Hand	0 to 4,000	Side	Right Hand	0 to 125	T-Handle	Brass	PTFE	Stainless Steel	0000000	000000
CGA 540	Side	Right Hand	0 to 4,000	Side	Right Hand	0 to 125	T-Handle	Brass/Steel	PTFE	Rubber	000000	000000

Tank-Mount High-Pressure-Regulating
Valves for Air and Inert Gas

For Use With: See Table
Temperature Range: -20° to 120° F

Often used for pressure-vessel testing and other high-pressure applications, these valves can handle at least seven times the outlet pressure of standard tank-mount pressure-regulating valves. They automatically reduce a high inlet pressure from compressed gas tanks to a lower, stable outlet pressure. All have Compressed Gas Association (CGA) numbered inlet fittings for secure connections to compressed gas tanks. Choose a valve with the same CGA number as your tank and other system components. Outlet fittings are Swagelok® for a leak-free seal around hard metal tubing in high-pressure lines. Also known as instrumentation fittings, Swagelok® fittings are compatible with Parker A-Lok, Gyrolok, Bilok, and Tylok fittings. Valves have a gauge to monitor outlet pressure and a gauge to monitor inlet pressure from the tank. They are single stage and reduce pressure in one step, which causes the outlet pressure to fluctuate slightly as you empty the tank.

For Use With Oxygen

Female Outlet × Female Inlet Straight With Knob

Inlet					Outlet					Material
CGA Number	Location	Thread Direction	Pressure Gauge Range, psi	Stage	For Tube OD	Location	Pressure Range, psi	Pressure Adjustment Method	Shape	Body	Seal	Diaphragm		Each
NGO Female Inlet × Swagelok® Female Outlet
CGA 540	Side	Right Hand	0 to 4,000	Single	1/4"	Side	0 to 1,500	Knob	Straight	Brass	PCTFE	Neoprene	0000000	0000000
CGA 540	Side	Right Hand	0 to 4,000	Single	1/4"	Side	0 to 2,500	Knob	Straight	Brass	PCTFE	Neoprene	0000000	000000

Tank-Mount Pressure-Regulating
Valves for Cryogenic Liquids

For Use With: See Table
Temperature Range: -20° to 120° F

Automatically reduce a high inlet pressure from compressed gas tanks to a lower, stable outlet pressure. These valves have Compressed Gas Association (CGA) numbered inlet fittings for secure connections to compressed gas tanks. Choose a valve with the same CGA number as your tank and other system components. Valves come with a gauge to monitor outlet pressure. They are single stage and reduce pressure in one step, which causes the outlet pressure to fluctuate slightly as you empty the tank.

	Inlet				Outlet
For Use With	CGA Number	Location	Thread Direction	Stage	Thread Size	Location	Thread Direction	Pressure Range, psi	Pressure Adjustment Method		Each
UNF Male Outlet × NGO Female Inlet
Brass Body—Stainless Steel Diaphragm and PTFE Seal
Liquid Oxygen	CGA 540	Side	Right Hand	Single	9/16"-18	Bottom	Right Hand	0 to 125	T-Handle	0000000	0000000

Terms and Conditions and Privacy Policy

About Pressure Gauges

About Pipe Size

About Gas Regulators

Gas Pressure Gauges

Gauge Guards

Sanitary Gauge Guards

Tank-Mount Pressure-RegulatingValves for Air and Inert Gas

Tank-Mount High-Pressure-RegulatingValves for Air and Inert Gas

Tank-Mount Pressure-RegulatingValves for Cryogenic Liquids

Tank-Mount Pressure-Regulating
Valves for Air and Inert Gas

Tank-Mount High-Pressure-Regulating
Valves for Air and Inert Gas

Tank-Mount Pressure-Regulating
Valves for Cryogenic Liquids