Diaphragm Gauges | McMaster-Carr

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Connection Location

Bottom

Center Back

Measurement Unit

Inches of Water

Ounces per Square Inch

Pounds per Square Inch

Pressure Numeric Increments

For Use With

Maximum Pressure

50 in. H₂O to 99 in. H₂O

100 in. H₂O to 149 in. H₂O

150 in. H₂O to 249 in. H₂O

250 in. H₂O or greater

Graduations

Dial Diameter

Measures

Material

Case Material

Lens Material

RoHS

REACH

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

DFARS Specialty Metals

Exempt

Export Control Classification Number (ECCN)

EAR99

Maximum Process Temperature

Accuracy Grade

Maximum Temperature

Case Finished Material

Minimum Vacuum

31 Products

About Pressure Gauges

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

High-Accuracy Low-Pressure Gauges

Measure small pressure changes in ventilation systems, hydraulic applications, and other critical processes with these high-accuracy gauges. Mount them with the dial face upright.

Painted Steel Case with Brass Connection—Single Scale (Pounds per Square Inch)


Bottom Connection	Center-Back Connection	Bottom Connection	Center-Back Connection

				Temp. Range, ° F					Bottom Connection		Center-Back Connection
	Dial Dia.	Pipe Size	Case Color	Environment	Process	For Use With	Accuracy	Choose a Pressure Range		Each		Each
Upright Mount







				NPT Male

				2 1/2"	1/4	Black	0 to 140	0 to 140	Air Carbon Dioxide Hydraulic Fluid Natural Gas Water	±1.5% Full Scale (Not Rated)	0 to 3 psi, 0 to 5 psi, 0 to 10 psi	4026K16	000000	4026K37	000000




						NPT Male with Calibration Certificate Traceable to NIST

						2 1/2"	1/4	Black	0 to 140	0 to 140	Air Carbon Dioxide Hydraulic Fluid Natural Gas Water	±1.5% Full Scale (Not Rated)	0 to 3 psi, 0 to 5 psi, 0 to 10 psi	4026K24	000000	4026K46	000000

Painted Steel Case with Brass Connection—Single Scale (Inches of Water)


Bottom Connection	Center-Back Connection	Bottom Connection	Center-Back Connection

				Temp. Range, ° F					Bottom Connection		Center-Back Connection
	Dial Dia.	Pipe Size	Case Color	Environment	Process	For Use With	Accuracy	Choose a Pressure Range		Each		Each
Upright Mount







				NPT Male

				2 1/2"	1/4	Black	0 to 140	0 to 140	Air Carbon Dioxide Hydraulic Fluid Natural Gas Water	±1.5% Full Scale (Not Rated)	0 to 10 in. H₂O, 0 to 15 in. H₂O, 0 to 30 in. H₂O, 0 to 60 in. H₂O, 0 to 100 in. H₂O, 0 to 160 in. H₂O, 0 to 200 in. H₂O	4026K17	000000	4026K44	000000




						NPT Male with Calibration Certificate Traceable to NIST

						2 1/2"	1/4	Black	0 to 140	0 to 140	Air Carbon Dioxide Hydraulic Fluid Natural Gas Water	±1.5% Full Scale (Not Rated)	0 to 10 in. H₂O, 0 to 15 in. H₂O, 0 to 30 in. H₂O, 0 to 60 in. H₂O, 0 to 100 in. H₂O, 0 to 160 in. H₂O, 0 to 200 in. H₂O	4026K29	000000	4026K63	000000

Painted Steel Case with Brass Connection—Single Scale (Ounces per Square Inch)


Bottom Connection	Center-Back Connection	Bottom Connection	Center-Back Connection

				Temp. Range, ° F					Bottom Connection		Center-Back Connection
	Dial Dia.	Pipe Size	Case Color	Environment	Process	For Use With	Accuracy	Choose a Pressure Range		Each		Each
Upright Mount







				NPT Male

				2 1/2"	1/4	Black	0 to 140	0 to 140	Air Carbon Dioxide Hydraulic Fluid Natural Gas Water	±1.5% Full Scale (Not Rated)	0 to 10 oz. per in², 0 to 15 oz. per in², 0 to 30 oz. per in², 0 to 60 oz. per in², 0 to 100 oz. per in², 0 to 160 oz. per in²	4026K23	000000	4026K45	000000




						NPT Male with Calibration Certificate Traceable to NIST

						2 1/2"	1/4	Black	0 to 140	0 to 140	Air Carbon Dioxide Hydraulic Fluid Natural Gas Water	±1.5% Full Scale (Not Rated)	0 to 10 oz. per in², 0 to 15 oz. per in², 0 to 30 oz. per in², 0 to 60 oz. per in², 0 to 100 oz. per in², 0 to 160 oz. per in²	4026K36	000000	4026K55	000000

304 Stainless Steel Case with Brass Connection—Single Scale (Pounds per Square Inch)


Bottom Connection	Bottom Connection

Gauges with 304 stainless steel case or polyester plastic case have better corrosion resistance than gauges with painted steel case.

			Temp. Range, ° F					Bottom Connection
	Dial Dia.	Pipe Size	Environment	Process	For Use With	Accuracy	Choose a Pressure Range		Each
Upright Mount







				NPT Male

				4"	1/4	0 to 140	0 to 140	Air Carbon Dioxide Hydraulic Fluid Natural Gas Water	±1% Full Scale (Grade 1A)	0 to 3 psi, 0 to 5 psi, 0 to 10 psi	4269K1	0000000

304 Stainless Steel Case with Brass Connection—Single Scale (Inches of Water)


Bottom Connection	Bottom Connection

Gauges with 304 stainless steel case or polyester plastic case have better corrosion resistance than gauges with painted steel case.

			Temp. Range, ° F					Bottom Connection
	Dial Dia.	Pipe Size	Environment	Process	For Use With	Accuracy	Choose a Pressure Range		Each
Upright Mount







				NPT Male

				4"	1/4	0 to 140	0 to 140	Air Carbon Dioxide Hydraulic Fluid Natural Gas Water	±1% Full Scale (Grade 1A)	0 to 10 in. H₂O, 0 to 15 in. H₂O, 0 to 30 in. H₂O, 0 to 60 in. H₂O, 0 to 100 in. H₂O, 0 to 160 in. H₂O, 0 to 200 in. H₂O	4269K2	0000000

304 Stainless Steel Case with Brass Connection—Single Scale (Ounces per Square Inch)


Bottom Connection	Bottom Connection

Gauges with 304 stainless steel case or polyester plastic case have better corrosion resistance than gauges with painted steel case.

			Temp. Range, ° F					Bottom Connection
	Dial Dia.	Pipe Size	Environment	Process	For Use With	Accuracy	Choose a Pressure Range		Each
Upright Mount







				NPT Male

				4"	1/4	0 to 140	0 to 140	Air Carbon Dioxide Hydraulic Fluid Natural Gas Water	±1% Full Scale (Grade 1A)	0 to 10 oz. per in², 0 to 15 oz. per in², 0 to 30 oz. per in², 0 to 60 oz. per in²	4269K3	0000000

Ultra-Low Vacuum Gauges

Accommodate applications with very low vacuum with these gauges. Use them with vacuum pumps, packaging equipment, and in suction lines to measure and display vacuum.

Painted Steel Case with Brass Connection—Single Scale (Inches of Water)


Bottom Connection	Bottom Connection

						Available Vacuum Ranges, in. H₂O					Bottom Connection
	Dial Dia.	Pipe Size	Environment Temp. Range, ° F	Process Temp. Range, ° F	Case Color	Vacuum Range	Graduations	Pressure Numeric Increments	For Use With	Accuracy		Each
NPT Male



		2 1/2"	1/4	0 to 140	0 to 175	Black	-100 to 0	2	20	Air	±1.6% Full Scale (Not Rated)	4106K15	000000


		2 1/2"	1/4	0 to 140	0 to 175	Black	-60 to 0	1	10	Air	±1.6% Full Scale (Not Rated)	4106K14	00000
		2 1/2"	1/4	0 to 140	0 to 175	Black	-30 to 0	0.5	5	Air	±1.6% Full Scale (Not Rated)	4106K13	00000
		2 1/2"	1/4	0 to 140	0 to 175	Black	-15 to 0	0.2	3	Air	±1.6% Full Scale (Not Rated)	4106K12	00000


		NPT Male with Calibration Certificate Traceable to NIST



				2 1/2"	1/4	0 to 140	0 to 175	Black	-100 to 0	2	20	Air	±1.6% Full Scale (Not Rated)	3843K34	000000


				2 1/2"	1/4	0 to 140	0 to 175	Black	-60 to 0	1	10	Air	±1.6% Full Scale (Not Rated)	3843K33	000000
				2 1/2"	1/4	0 to 140	0 to 175	Black	-30 to 0	0.5	5	Air	±1.6% Full Scale (Not Rated)	3843K32	000000
				2 1/2"	1/4	0 to 140	0 to 175	Black	-15 to 0	0.2	3	Air	±1.6% Full Scale (Not Rated)	3843K31	000000

304 Stainless Steel Case with Brass Connection—Single Scale (Inches of Water)


Bottom Connection	Bottom Connection

Gauges with a 304 stainless steel case have better corrosion resistance than gauges with a steel case.

					Available Vacuum Ranges, in. H₂O					Bottom Connection
	Dial Dia.	Pipe Size	Environment Temp. Range, ° F	Process Temp. Range, ° F	Vacuum Range	Graduations	Pressure Numeric Increments	For Use With	Accuracy		Each
NPT Male



		4"	1/4	0 to 140	0 to 175	-100 to 0	2	20	Air	±1% Full Scale (Not Rated)	4106K25	0000000


		4"	1/4	0 to 140	0 to 175	-60 to 0	1	10	Air	±1% Full Scale (Not Rated)	4106K24	000000
		4"	1/4	0 to 140	0 to 175	-30 to 0	0.5	5	Air	±1% Full Scale (Not Rated)	4106K23	000000
		4"	1/4	0 to 140	0 to 175	-15 to 0	0.2	3	Air	±1% Full Scale (Not Rated)	4106K22	000000


		NPT Male with Calibration Certificate Traceable to NIST



				4"	1/4	0 to 140	0 to 175	-100 to 0	2	20	Air	±1% Full Scale (Not Rated)	3843K44	000000


				4"	1/4	0 to 140	0 to 175	-60 to 0	1	10	Air	±1% Full Scale (Not Rated)	3843K43	000000
				4"	1/4	0 to 140	0 to 175	-30 to 0	0.5	5	Air	±1% Full Scale (Not Rated)	3843K42	000000
				4"	1/4	0 to 140	0 to 175	-15 to 0	0.2	3	Air	±1% Full Scale (Not Rated)	3843K41	000000