Boric Acid Gauges | McMaster-Carr

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System of Measurement

Pipe Size

Connection Location

For Use With

Alcohol-Based Solvents

Printed Circuit Boards

Stems with Clamping Nut

Surfaces

Taps

Thermocouple Connection Heads

Acetic Acid (White Vinegar)

Argon/Carbon Dioxide Blend

Hydraulic Fluid (Petroleum Based)

Sodium Bicarbonate (Baking Soda)

Sodium Hydroxide (Caustic Soda)

Sodium Hypochlorite (Bleach)

Dial Diameter

Dial Type

Maximum Pressure

1,000 psi to 1,999.9 psi

2,000 psi to 9,999.9 psi

Less than 10,000 kPa

10,000 kPa to 19,999 kPa

Connection Material

Material

Thread Type

Case Material

Scale Type

Gender

Pressure Numeric Increments

Measurement Unit

Kilograms per Square Centimeter

Kilopascals

Pounds per Square Inch

Measures

Fitting Connection

Graduations

Guard Material

Connects To

Display Type

RoHS

REACH

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

Yes

Export Control Classification Number (ECCN)

EAR99

DFARS Specialty Metals

Exempt

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157 Products

About Pressure Gauges

Find a gauge with the right connection material and dial type—many with traceable calibration certificates.

About Pipe Size

Bottom Connection

These gauges have a glycerin-filled dial that reduces needle flutter for precise readings in high-vibration applications reaching 2,000 psi. A 316 stainless steel guard, also known as an isolator, protects the gauge from damage caused by corrosive chemicals. Use them with pumps, filters, regulators, and in process lines to measure and display pressure.

304 Stainless Steel Case with 316 Stainless Steel Connection—Dual Scale (psi, kPa)

For Use With: Air, Water, Hydraulic Fluid, Ammonia, Bleach, Boric Acid, Gasoline, Diesel Fuel, and Natural Gas
Accuracy: ±1.6% Full Scale (Not Graded)

Available Pressure Gauges
Pressure Range		Graduation Marks		Numeric Increments
psi	kPa	psi	kPa	psi	kPa
2 1/2" Dial Diameter
0 to 15	0 to 100	0.2	2	3	20
0 to 30	0 to 200	0.5	5	5	50
0 to 60	0 to 400	1	10	10	100
0 to 100	0 to 700	2	10	20	100
0 to 160	0 to 1,100	2	20	20	200
0 to 200	0 to 1,400	5	20	40	200
0 to 300	0 to 2,000	5	50	50	400
0 to 400	0 to 2,800	10	100	50	500
0 to 600	0 to 4,000	10	100	100	1,000
0 to 1,000	0 to 7,000	20	100	200	1,000
0 to 2,000	0 to 14,000	50	200	400	2,000
4" Dial Diameter
0 to 15	0 to 100	0.1	2	2	20
0 to 30	0 to 200	0.5	5	5	50
0 to 60	0 to 400	1	10	10	100
0 to 100	0 to 700	2	10	20	100
0 to 160	0 to 1,100	2	20	20	200
0 to 200	0 to 1,400	5	50	50	200
0 to 300	0 to 2,000	5	50	50	500
0 to 400	0 to 2,800	10	100	50	500
0 to 600	0 to 4,000	10	100	100	800
0 to 1,000	0 to 7,000	20	100	200	1,000
0 to 2,000	0 to 14,000	50	200	400	2,000

						Bottom Connection
Dial Diameter	Pipe Size	Environment Temp. Range, °F	Process Temp. Range, °F	Guard Material	Mounting Orientation		Each
NPT Female
2 1/2"	1/4	35° to 140°	0° to 210°	316 Stainless Steel	Any	3813K5	0000000
2 1/2"	1/2	35° to 140°	0° to 210°	316 Stainless Steel	Any	3813K6	000000
4"	1/4	35° to 140°	0° to 210°	316 Stainless Steel	Any	3813K7	000000
4"	1/2	35° to 140°	0° to 210°	316 Stainless Steel	Any	3813K8	000000

Low-Pressure Gauges for Chemicals

With 316 Stainless Steel Guard

With PVC Guard

With CPVC Guard

With Polypropylene Guard

Bottom Connection (Steel Guard)

Bottom Connection (Plastic Guard)

A plastic or stainless steel guard, also known as an isolator, protects the gauge from damage caused by corrosive chemicals. Use them with pumps, filters, regulators, and in process lines to measure and display pressures.

Polypropylene and 316 stainless steel guards are more chemical resistant than PVC and CPVC guards.

304 Stainless Steel Case with 316 Stainless Steel Connection—Dual Scale (psi, kPa)

For Use With: Air, Water, Hydraulic Fluid, Ammonia, Bleach, Boric Acid, Gasoline, Diesel Fuel, and Natural Gas
Accuracy: ±1.6% Full Scale (Not Graded)

Available Pressure Ranges
Pressure Range		Graduation Marks		Numeric Increments
psi	kPa	psi	kPa	psi	kPa
2 1/2" Dial Diameter
0 to 15	0 to 100	0.2	2	3	20
0 to 30	0 to 200	0.5	5	5	50
0 to 60	0 to 400	1	10	10	100
0 to 100	0 to 700	2	10	20	100
0 to 160	0 to 1,100	2	20	20	200
4" Dial Diameter
0 to 15	0 to 100	0.1	2	2	20
0 to 30	0 to 200	0.5	5	5	50
0 to 60	0 to 400	1	10	10	100
0 to 100	0 to 700	2	10	20	100
0 to 160	0 to 1,100	2	20	20	200

						Bottom Connection
Dial Diameter	Pipe Size	Environment Temp. Range, °F	Process Temp. Range, °F	Mounting Orientation	Guard Material		Each
NPT Female
2 1/2"	1/4	-40° to 140°	0° to 210°	Any	316 Stainless Steel	3813K13	0000000
2 1/2"	1/2	-40° to 140°	0° to 210°	Any	316 Stainless Steel	3813K14	000000
4"	1/4	-40° to 140°	0° to 210°	Any	316 Stainless Steel	3813K11	000000
4"	1/2	-40° to 140°	0° to 210°	Any	316 Stainless Steel	3813K12	000000

Painted Steel Case with PVC Plastic Connection—Dual Scale (psi, kg/cm²)

For Use With: Water, Salt Water, Hydraulic Fluid, Bleach, Boric Acid, and Carbon Dioxide
Accuracy: ±2% Mid Scale (Grade B)

Available Pressure Ranges
Pressure Range		Graduation Marks		Numeric Increments
psi	kg/cm²	psi	kg/cm²	psi	kg/cm²
0 to 30	0 to 2.1	0.5	0.05	5	0.5
0 to 60	0 to 4.2	1	0.1	10	1
0 to 150	0 to 11.2	2	0.2	20	2

							Bottom Connection
Dial Diameter	Pipe Size	Environment Temp. Range, °F	Process Temp. Range, °F	Case Color	Guard Material	Guard Color		Each
NPT Female
2"	1/4	40° to 140°	40° to 140°	Black	PVC Plastic	Gray	4091K23	0000000
2"	1/2	40° to 140°	40° to 140°	Black	PVC Plastic	Gray	4091K24	000000

Painted Steel Case with CPVC Plastic Connection—Dual Scale (psi, kg/cm²)

For Use With: Water, Salt Water, Hydraulic Fluid, Bleach, Boric Acid, and Carbon Dioxide
Accuracy: ±2% Mid Scale (Grade B)

Available Pressure Ranges
Pressure Range		Graduation Marks		Numeric Increments
psi	kg/cm²	psi	kg/cm²	psi	kg/cm²
0 to 30	0 to 2.1	0.5	0.05	5	0.5
0 to 60	0 to 4.2	1	0.1	10	1
0 to 150	0 to 11.2	2	0.2	20	2

							Bottom Connection
Dial Diameter	Pipe Size	Environment Temp. Range, °F	Process Temp. Range, °F	Case Color	Guard Material	Guard Color		Each
NPT Female
2"	1/4	40° to 190°	40° to 190°	Black	CPVC Plastic	Gray	4147K41	0000000
2"	1/2	40° to 190°	40° to 190°	Black	CPVC Plastic	Gray	4147K42	000000

Painted Steel Case with Polypropylene Plastic Connection—Dual Scale (psi, kg/cm²)

For Use With: Water, Salt Water, Hydraulic Fluid, Boric Acid, and Carbon Dioxide
Accuracy: ±2% Mid Scale (Grade B)

Available Pressure Ranges
Pressure Range		Graduation Marks		Numeric Increments
psi	kg/cm²	psi	kg/cm²	psi	kg/cm²
0 to 30	0 to 2.1	0.5	0.05	5	0.5
0 to 60	0 to 4.2	1	0.1	10	1
0 to 150	0 to 11.2	2	0.2	20	2

							Bottom Connection
Dial Diameter	Pipe Size	Environment Temp. Range, °F	Process Temp. Range, °F	Case Color	Guard Material	Guard Color		Each
NPT Female
2"	1/4	40° to 240°	40° to 240°	Black	Polypropylene Plastic	White	4134K23	0000000

High-Pressure Gauges for Chemicals

Bottom Connection

A 316 stainless steel guard, also known as an isolator, protects the gauge from damage caused by corrosive chemicals. Gauges are commonly used with pumps, filters, regulators, and in process lines to measure and display pressures up to 2,000 psi.

304 Stainless Steel Case with 316 Stainless Steel Connection—Dual Scale (psi, kPa)

For Use With: Air, Water, Hydraulic Fluid, Ammonia, Bleach, Boric Acid, Gasoline, Diesel Fuel, and Natural Gas
Accuracy: ±1.6% Full Scale (Not Graded)

Pressure Range		Graduation Marks		Numeric Increments
psi	kPa	psi	kPa	psi	kPa
2 1/2" Dial Diameter
0 to 200	0 to 1,400	5	20	40	200
0 to 300	0 to 2,000	5	50	50	400
0 to 400	0 to 2,800	5	50	50	500
0 to 600	0 to 4,000	10	100	100	1,000
0 to 1,000	0 to 7,000	20	100	200	1,000
0 to 2,000	0 to 14,000	50	200	400	2,000
4" Dial Diameter
0 to 200	0 to 1,400	5	50	50	200
0 to 300	0 to 2,000	5	50	50	500
0 to 400	0 to 2,800	5	50	50	500
0 to 600	0 to 4,000	10	100	100	800
0 to 1,000	0 to 7,000	20	100	200	1,000
0 to 2,000	0 to 14,000	50	200	400	2,000

						Bottom Connection
Dial Diameter	Pipe Size	Environment Temp. Range, °F	Process Temp. Range, °F	Guard Material	Mounting Orientation		Each
NPT Female
2 1/2"	1/4	-40° to 140°	0° to 210°	316 Stainless Steel	Any	3813K3	0000000
2 1/2"	1/2	-40° to 140°	0° to 210°	316 Stainless Steel	Any	3813K4	000000
4"	1/4	-40° to 140°	0° to 210°	316 Stainless Steel	Any	3813K1	000000
4"	1/2	-40° to 140°	0° to 210°	316 Stainless Steel	Any	3813K2	000000

Chemical-Level Indicators

Screw-In Mount

Through-Wall Mount

Screw-In/Through-Wall Mount

Check the level of liquids containing chemicals such as alcohol-based solvents, boric acid, and sodium bicarbonate. These indicators can be used in pressurized applications where overflow is a concern. All have an aluminum gauge shield that protects the glass window from impact. Clear liquids magnify a red line at the back of the window, so their levels are easier to see.

Screw-in indicators mount from the outside of your tank into threaded pipe or threaded holes.

Through-wall indicators mount from the inside of your tank through unthreaded holes. Secure with nuts on the inside of your tank.

Screw-in/through-wall indicators give you the option to mount from the inside or outside of your tank. Use the mounting nuts on the inside of your tank to attach them through unthreaded holes or thread them into pipe or threaded holes on the tank’s outside.

						Temp. Range, °F
Connection Ctr.-to-Ctr.	Overall Ht.	Window Ht.	Body Wd.	For Max. Tank Wall Thick.	Max. Pressure	Min.	Max.	Fitting Material	Window Material	Features	Includes		Each
Screw-In Mount—Aluminum
3/8 NPTF Male Thread
3"	4 5/8"	1 1/2"	1 3/4"	__	290 psi @ 70° F	-15°	400°	Brass	Glass	Red Line	__	3888N11	000000
1/2 NPTF Male Thread
6"	7 5/8"	4 1/2"	1 9/16"	__	290 psi @ 70° F	-15°	400°	Brass	Glass	Red Line	__	3888N13	00000
8"	9 5/8"	6 1/2"	1 9/16"	__	290 psi @ 70° F	-15°	400°	Brass	Glass	Red Line	__	3888N14	00000
10"	11 5/8"	8 1/2"	1 9/16"	__	275 psi @ 70° F	-15°	400°	Brass	Glass	Red Line	__	3888N15	00000
12"	13 5/8"	10 1/2"	1 9/16"	__	270 psi @ 70° F	-15°	400°	Brass	Glass	Red Line	__	3888N16	00000
Through-Wall Mount—Aluminum
1/2"-20 UNF Male Thread—For 1/2" Hole Dia. (2 Holes)
5"	6 5/8"	3 1/2"	7/8"	3/4"	290 psi @ 70° F	-15°	400°	Aluminum	Glass	Red Line	Mounting Nuts	3888N25	00000
10"	11 5/8"	8 1/2"	7/8"	3/4"	275 psi @ 70° F	-15°	400°	Aluminum	Glass	Red Line	Mounting Nuts	3888N27	00000
12"	13 5/8"	10 1/2"	7/8"	3/4"	270 psi @ 70° F	-15°	400°	Aluminum	Glass	Red Line	Mounting Nuts	3888N28	00000
Screw-In/Through-Wall Mount—Aluminum
1/2"-20 UNF Male Thread—For 1/2" Hole Dia. (2 Holes)
3"	4 5/8"	1 1/2"	1 1/8"	1/2"	290 psi @ 70° F	-15°	400°	Aluminum	Glass	Red Line	Mounting Nuts	3888N17	00000
5"	6 5/8"	3 1/2"	1 1/8"	1/2"	290 psi @ 70° F	-15°	400°	Aluminum	Glass	Red Line	Mounting Nuts	3888N18	00000
6"	7 5/8"	4 1/2"	1 1/8"	1/2"	290 psi @ 70° F	-15°	400°	Aluminum	Glass	Red Line	Mounting Nuts	3888N19	00000
8"	9 5/8"	6 1/2"	1 1/8"	1/2"	290 psi @ 70° F	-15°	400°	Aluminum	Glass	Red Line	Mounting Nuts	3888N21	00000
10"	11 5/8"	8 1/2"	1 1/8"	1/2"	275 psi @ 70° F	-15°	400°	Aluminum	Glass	Red Line	Mounting Nuts	3888N22	00000
12"	13 5/8"	10 1/2"	1 1/8"	1/2"	270 psi @ 70° F	-15°	400°	Aluminum	Glass	Red Line	Mounting Nuts	3888N23	00000

Chemical-Resistant Vertical-Mount Liquid-Level Gauges for Tanks

With a stainless steel float and float rod, these gauges resist corroding from chemicals. Their indicator moves up as your tank fills. Check the indicator against the graduation marks to see how full your tank is and if you need to fill or drain it. Plastic protects the indicator's movement, saving you from inaccurate readings.

Alarms can be set to flash and sound at levels critical to your system.

Remote-reading displays let you check readings from up to 100 ft. away. They have an alarm that sounds when the level is too high or too low.

Gauges

Gauge

			Temp. Range, °F
For Tank Dp.	Max. Pressure, psi	Window Ht.	Min.	Max.	Float Material	Graduation Marks	Window Material		Each
1 1/2 NPT Male
316 Stainless Steel Float Rod
12"	70	3"	-50°	400°	316 Stainless Steel	Full, 7/8, 3/4, 5/8, 1/2, 3/8, 1/4, 1/8, Empty	Plastic	3894N11	0000000
20"	70	3"	-50°	400°	316 Stainless Steel	Full, 7/8, 3/4, 5/8, 1/2, 3/8, 1/4, 1/8, Empty	Plastic	3894N12	000000
24"	70	3"	-50°	400°	316 Stainless Steel	Full, 7/8, 3/4, 5/8, 1/2, 3/8, 1/4, 1/8, Empty	Plastic	3894N13	000000
30"	70	3"	-50°	400°	316 Stainless Steel	Full, 7/8, 3/4, 5/8, 1/2, 3/8, 1/4, 1/8, Empty	Plastic	3894N14	000000
36"	70	3"	-50°	400°	316 Stainless Steel	Full, 7/8, 3/4, 5/8, 1/2, 3/8, 1/4, 1/8, Empty	Plastic	3894N15	000000
48"	70	3"	-50°	400°	316 Stainless Steel	Full, 7/8, 3/4, 5/8, 1/2, 3/8, 1/4, 1/8, Empty	Plastic	3894N16	000000
2 NPT Male
316 Stainless Steel Float Rod
12"	70	3"	-50°	400°	316 Stainless Steel	Full, 7/8, 3/4, 5/8, 1/2, 3/8, 1/4, 1/8, Empty	Plastic	3894N17	000000
20"	70	3"	-50°	400°	316 Stainless Steel	Full, 7/8, 3/4, 5/8, 1/2, 3/8, 1/4, 1/8, Empty	Plastic	3894N18	000000
24"	70	3"	-50°	400°	316 Stainless Steel	Full, 7/8, 3/4, 5/8, 1/2, 3/8, 1/4, 1/8, Empty	Plastic	3894N19	000000
30"	70	3"	-50°	400°	316 Stainless Steel	Full, 7/8, 3/4, 5/8, 1/2, 3/8, 1/4, 1/8, Empty	Plastic	3894N21	000000
36"	70	3"	-50°	400°	316 Stainless Steel	Full, 7/8, 3/4, 5/8, 1/2, 3/8, 1/4, 1/8, Empty	Plastic	3894N22	000000
42"	70	3"	-50°	400°	316 Stainless Steel	Full, 7/8, 3/4, 5/8, 1/2, 3/8, 1/4, 1/8, Empty	Plastic	3894N23	000000
48"	70	3"	-50°	400°	316 Stainless Steel	Full, 7/8, 3/4, 5/8, 1/2, 3/8, 1/4, 1/8, Empty	Plastic	3894N24	000000
60"	70	3"	-50°	400°	316 Stainless Steel	Full, 7/8, 3/4, 5/8, 1/2, 3/8, 1/4, 1/8, Empty	Plastic	3894N25	000000

Alarms

Direct-Mount Alarm Shown with Gauge (Sold Separately)

Remote-Mount Alarm Shown with Gauge (Sold Separately)

		Light
Cord Length, ft.	Signal Type	Color	Pattern	No. of	Bulb Type	Volume	Housing Material	Batteries Included		Each
Direct Mount
__	Audible Alarm, Signal Light	Red	Flashing	1	LED	110 dB	ABS Plastic	No	3711K153	0000000
Remote Mount
25	Audible Alarm, Signal Light	Red	Flashing	1	LED	110 dB	ABS Plastic	No	3711K148	000000
50	Audible Alarm, Signal Light	Red	Flashing	1	LED	110 dB	ABS Plastic	No	3711K149	000000
75	Audible Alarm, Signal Light	Red	Flashing	1	LED	110 dB	ABS Plastic	No	3711K151	000000
100	Audible Alarm, Signal Light	Red	Flashing	1	LED	110 dB	ABS Plastic	No	3711K152	000000

Remote-Reading Displays

Remote-Reading Display Shown with Gauge (Sold Separately)

			Light
Cord Length, ft.	Signal Type	Display Type	Color	Indicator Display Type	No. of	Volume	Housing Material	Batteries Included		Each
25	Audible Alarm	Light Indicator	Green/Red/Yellow	LED	9	0 dB, 90 dB, 100 dB	ABS Plastic	No	3711K144	0000000
50	Audible Alarm	Light Indicator	Green/Red/Yellow	LED	9	0 dB, 90 dB, 100 dB	ABS Plastic	No	3711K145	000000
75	Audible Alarm	Light Indicator	Green/Red/Yellow	LED	9	0 dB, 90 dB, 100 dB	ABS Plastic	No	3711K146	000000
100	Audible Alarm	Light Indicator	Green/Red/Yellow	LED	9	0 dB, 90 dB, 100 dB	ABS Plastic	No	3711K147	000000

About Pipe Size

Vibration-Resistant Pressure Gauges for Chemicals

Low-Pressure Gauges for Chemicals

High-Pressure Gauges for Chemicals

Chemical-Level Indicators

Chemical-Resistant Vertical-Mount Liquid-Level Gauges for Tanks