Inline Mount Switches | McMaster-Carr

Clear All

	Pipe Size Pipe Size

1/4

	Thread Type Thread Type

NPT

	For Use With For Use With

	Body Material Body Material

	Set Point Set Point

	Maximum Pressure Maximum Pressure

	Maximum Voltage Maximum Voltage

120V AC

240V AC

	Current Current

	Shape Shape


Straight	90° Elbow

	Mounting Orientation Mounting Orientation

Vertical

Horizontal

Any Position

	Maximum Temperature Maximum Temperature

Less than 250° F

250° to 499° F

	Mounting Location Mounting Location	Show

Inline

	Mounting Location Mounting Location	Hide

	Connection Style Connection Style

	Threaded

	Set Point Configuration Set Point Configuration

Nonadjustable

Adjustable

	Gender Gender

Male

Female

	Connection Type Connection Type

	Pipe

	Electrical Connection Type Electrical Connection Type

Hardwire

Screw Terminals

Wire Leads

	Maximum Flow Maximum Flow

	Minimum Temperature Minimum Temperature

-99° to 0° F

1° to 99° F

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

DFARS Specialty Metals
COTS-Exempt

	Switch Starting Position Switch Starting Position

1 Off (Normally Open)

1 Off (Normally Open) or 1 On
(Normally Closed)

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant

View catalog pages (2)

Forward

How can we improve?

55 Products

Flow Switches for Water and Oil

These switches activate or deactivate equipment when the flow rate reaches your set point. They are single pole, double throw (SPDT) and can be installed to turn one circuit from “off” to “on” (normally open) or from “on” to “off” (normally closed).

Switches with a 316 stainless steel body are more corrosion resistant than switches with a bronze body.

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

							Conduit
Pipe Size	Thread Type	Gender	Max. Pressure	Temp. Range, °F	Voltage	Current	Trade Size	Thread Type	Gender	End-to-End Lg.	Choose a Set Point, gpm		Each
Bronze Body
1	NPT	Female	400 psi @ 70° F	-20° to 300°	120V AC/ 240V AC	0.17 A @ 120 V AC	1/2	NPT	Male	3 1/4"	0.5, 2, 4, 6, 8	0000000	0000000
1 1/4	NPT	Female	400 psi @ 70° F	-20° to 300°	120V AC/ 240V AC	0.17 A @ 120 V AC	1/2	NPT	Male	4"	1, 4, 8, 12, 20	0000000	000000
1 1/2	NPT	Female	400 psi @ 70° F	-20° to 300°	120V AC/ 240V AC	0.17 A @ 120 V AC	1/2	NPT	Male	4 1/2"	1.5, 5, 10, 20, 30	0000000	000000
2	NPT	Female	400 psi @ 70° F	-20° to 300°	120V AC/ 240V AC	0.17 A @ 120 V AC	1/2	NPT	Male	5 3/8"	2, 5, 15, 35, 50	0000000	000000
316 Stainless Steel Body
1	NPT	Female	400 psi @ 70° F	-20° to 300°	120V AC/ 240V AC	0.17 A @ 120 V AC	1/2	NPT	Male	3 1/4"	0.5, 2, 4, 6, 8	0000000	000000
1 1/4	NPT	Female	400 psi @ 70° F	-20° to 300°	120V AC/ 240V AC	0.17 A @ 120 V AC	1/2	NPT	Male	4 1/2"	1, 4, 8, 12, 20	0000000	00000000
1 1/2	NPT	Female	400 psi @ 70° F	-20° to 300°	120V AC/ 240V AC	0.17 A @ 120 V AC	1/2	NPT	Male	4 1/2"	1.5, 5, 10, 20, 30	0000000	00000000
2	NPT	Female	400 psi @ 70° F	-20° to 300°	120V AC/ 240V AC	0.17 A @ 120 V AC	1/2	NPT	Male	5 3/8"	2, 5, 15, 35, 50	0000000	00000000

Adjustable Flow Switches for Water and Oil

An adjustment screw lets you alter the set point to suit your application. These switches activate or deactivate equipment when the flow rate reaches your set point. All are single pole, double throw (SPDT) and can be installed to turn one circuit from “off” to “on” (normally open) or from “on” to “off” (normally closed).

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

Straight

							Conduit
Pipe Size	Thread Type	Gender	Max. Pressure	Temp. Range, °F	Voltage	Current	Trade Size	Thread Type	Gender	End-to-End Lg.	Choose a Set Point, gpm		Each
Bronze Body
1	NPT	Female	400 psi @ 70° F	-20° to 200°	120V AC/ 240V AC	0.17 A @ 120 V AC	1/2	NPT	Male	3 1/4"	1-6, 2-8, 5-15	000000	0000000

Elbow

							Conduit
Pipe Size	Thread Type	Gender	Max. Pressure	Temp. Range, °F	Voltage	Current	Trade Size	Thread Type	Gender	Port-to-Port Lg.	Choose a Set Point, gpm		Each
Bronze Body
3/4	NPT	Female	400 psi @ 70° F	-20° to 180°	120V AC/ 240V AC	0.17 A @ 120 V AC	1/2	NPT	Male	1 3/8"	0.75-4, 2-8, 7-14	000000	0000000

Compact Flow Switches for Oil

The low-profile metal body is designed for use in oil pipelines with limited clearance. These switches activate or deactivate equipment when the flow rate reaches your set point.

SPST-NO switches turn one circuit from “off” to “on” (normally open).

SPDT switches can be installed to turn one circuit from “off” to “on” (normally open) or from “on” to “off” (normally closed).

Switches with a 316 stainless steel body are more corrosion resistant than switches with a brass body.

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

Straight—SPST-NO

Pipe Size	Thread Type	Gender	Body Material	Max. Pressure	Temp. Range, °F	Voltage	Current	End-to-End Lg.	Choose a Set Point, gpm		Each
3/8	NPT	Male	Brass	1500 psi @ 70° F	-20° to 275°	120V AC 240V AC	0.2 A @ 120 V AC	3 7/16"	0.25, 0.5, 1, 1.5, 2	000000	0000000
3/8	NPT	Male	316 Stainless Steel	1500 psi @ 70° F	-20° to 275°	120V AC 240V AC	0.2 A @ 120 V AC	3 7/16"	0.25, 0.5, 1, 1.5, 2	000000	000000
1/2	NPT	Male	Brass	1500 psi @ 70° F	-20° to 275°	120V AC 240V AC	0.2 A @ 120 V AC	4"	0.25, 0.5, 1, 1.5, 2	000000	000000

Elbow—SPDT

								Conduit
Pipe Size	Thread Type	Gender	Body Material	Max. Pressure	Temp. Range, °F	Voltage	Current	Trade Size	Thread Type	Gender	Port-to-Port Lg.	Choose a Set Point, gpm		Each
1/4	NPT	Female	Brass	1000 psi @ 70° F	-20° to 225°	120V AC 240V AC	0.2 A @ 120 V AC	1/2	NPT	Female	2 1/16"	0.013, 0.025, 0.055, 0.075	000000	0000000
1/4	NPT	Female	Brass	1000 psi @ 70° F	-20° to 225°	120V AC 240V AC	0.2 A @ 120 V AC	1/2	NPT	Female	2 1/16"	0.1, 0.25, 0.5, 0.75, 1, 1.5	000000	000000

Compact Flow Switches for Water

These switches have a low-profile design to fit in water pipelines with limited clearance. They activate or deactivate equipment when the flow rate reaches your set point.

SPST-NO switches turn one circuit from “off” to “on” (normally open).

SPDT switches can be installed to turn one circuit from “off” to “on” (normally open) or from “on” to “off” (normally closed).

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

Straight

Straight (SPST-NO)—Female

Straight (SPST-NO)—Male

SPST-NO
Pipe Size	Thread Type	Gender	Body Material	Max. Pressure	Temp. Range, °F	Voltage	Current	End-to-End Lg.	Choose a Set Point, gpm		Each
1/4	NPT	Female	Polypropylene Plastic	200 psi @ 70° F	33° to 194°	120V AC/ 240V AC	__	4 7/8"	0.1, 0.25, 0.5, 0.75, 1	000000	000000
3/8	NPT	Male	Polypropylene Plastic	125 psi @ 70° F	33° to 212°	120V AC	0.2 A @ 120 V AC	4"	0.25, 0.5, 1, 1.5, 2	0000000	00000

Elbow

Elbow (SPST-NO)

Elbow (SPDT)

SPST-NO
Pipe Size	Thread Type	Gender	Body Material	Max. Pressure	Temp. Range, °F	Voltage	Current	Max. Current @ Max. Switching Voltage	Port-to-Port Lg.	Choose a Set Point, gpm		Each
1/4	NPT	Female	Polypropylene Plastic	200 psi @ 70° F	33° to 194°	120V AC/ 240V AC	__	0.5 A @ 300 V AC; 0.7 A @ 350 V DC	1 7/8"	0.1, 0.25, 0.5, 0.75, 1	000000	000000
1/2	NPT	Female	PVC Plastic	120 psi @ 70° F	33° to 120°	120V AC/ 240V AC	0.2 A @ 120 V AC	__	2 1/16"	0.5	0000000	000000
SPDT
1/4	NPT	Female	PPS Plastic	250 psi @ 70° F	32° to 225°	120V AC/ 240V AC	0.2 A @ 120 V AC	__	1 7/8"	0.1, 0.25, 0.75, 1, 1.5	0000000	000000

Washdown Flow Switches for Water and Oil

For protection from dirt, washdowns, and corrosion, these switches have an enclosure that meets IP66 and NEMA 4X. They activate or deactivate equipment when the flow rate reaches your set point and have an adjustment screw for altering the set point. All are single pole, double throw (SPDT) and can be installed to turn one circuit from “off” to “on” (normally open) or from “on” to “off” (normally closed).

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

Bronze Body
Pipe Size	Thread Type	Gender	Max. Pressure	Temp. Range, °F	Voltage	Current	Conduit Trade Size	End-to-End Lg.	Choose a Set Point, gpm		Each
1/4	NPT	Female	400 psi @ 70° F	-30° to 212°	120V AC	0.4 A @ 120 V AC	1/2	3 1/16"	0.3-2, 0.4-3, 0.5-4	0000000	0000000
1/2	NPT	Female	400 psi @ 70° F	-30° to 212°	120V AC	0.4 A @ 120 V AC	1/2	3 1/16"	0.3-2, 0.4-3, 0.5-4, 0.5-6, 1.5-10	0000000	000000
3/4	NPT	Female	400 psi @ 70° F	-30° to 212°	120V AC	0.4 A @ 120 V AC	1/2	3 1/16"	0.5-6, 1.5-10, 2-15, 3-20	0000000	000000
1	NPT	Female	400 psi @ 70° F	-30° to 212°	120V AC	0.4 A @ 120 V AC	1/2	3 1/16"	2-15, 3-20, 4-30, 5-40	0000000	000000
1 1/2	NPT	Female	400 psi @ 70° F	-30° to 212°	120V AC	0.4 A @ 120 V AC	1/2	3 1/16"	4-30, 5-40, 5-60, 15-100	0000000	000000
2	NPT	Female	400 psi @ 70° F	-30° to 212°	120V AC	0.4 A @ 120 V AC	1/2	3 3/16"	5-40, 5-60, 15-100, 20-150, 30-200	0000000	000000

Hazardous Location Flow Switches for Water, Air, and Inert Gas

These switches are UL listed for environments with flammable gases and combustible dust. They activate or deactivate equipment when the flow rate reaches your set point. All are single pole, double throw (SPDT) and can be installed to turn one circuit from “off” to “on” (normally open) or from “on” to “off” (normally closed).

Switches with a brass body meet NEC Class I, Divisions 1 and 2, Groups B, C, and D; and NEC Class II, Divisions 1 and 2, Groups E, F, and G.

Switches with a 304 stainless steel body are more corrosion resistant than switches with a brass body and meet NEC Class I, Divisions 1 and 2, Groups A, B, C, and D; and NEC Class II, Divisions 1 and 2, Groups E, F, and G.

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

			Set Point						Conduit
Pipe Size	Thread Type	Gender	For Water, gpm	For Air and Inert Gas, scfm	Max. Pressure	Temp. Range, °F	Voltage	Current	Trade Size	Thread Type	Gender	End-to-End Lg.		Each
Brass Body
1/2	NPT	Female	1.5	6.5	250 psi @ 70° F	-4° to 220°	120V AC/ 240V AC	5 A @ 120 V AC	3/4	NPT	Male	2 1/4"	00000000	0000000
3/4	NPT	Female	2	10	250 psi @ 70° F	-4° to 220°	120V AC/ 240V AC	5 A @ 120 V AC	3/4	NPT	Male	2 3/8"	00000000	000000
1	NPT	Female	3	14	250 psi @ 70° F	-4° to 220°	120V AC/ 240V AC	5 A @ 120 V AC	3/4	NPT	Male	2 1/2"	00000000	000000
1 1/4	NPT	Female	4	21	250 psi @ 70° F	-4° to 220°	120V AC/ 240V AC	5 A @ 120 V AC	3/4	NPT	Male	2 5/8"	00000000	000000
1 1/2	NPT	Female	6	33	250 psi @ 70° F	-4° to 220°	120V AC/ 240V AC	5 A @ 120 V AC	3/4	NPT	Male	2 7/8"	00000000	000000
2	NPT	Female	10	43	250 psi @ 70° F	-4° to 220°	120V AC/ 240V AC	5 A @ 120 V AC	3/4	NPT	Male	3"	00000000	000000
304 Stainless Steel Body
1/2	NPT	Female	1.5	6.5	2000 psi @ 70° F	-4° to 220°	120V AC/ 240V AC	5 A @ 120 V AC	3/4	NPT	Male	2 1/4"	00000000	000000
3/4	NPT	Female	2	10	2000 psi @ 70° F	-4° to 220°	120V AC/ 240V AC	5 A @ 120 V AC	3/4	NPT	Male	2 5/8"	00000000	000000
1	NPT	Female	3	14	2000 psi @ 70° F	-4° to 220°	120V AC/ 240V AC	5 A @ 120 V AC	3/4	NPT	Male	3"	00000000	000000
2	NPT	Female	10	43	2000 psi @ 70° F	-4° to 220°	120V AC/ 240V AC	5 A @ 120 V AC	3/4	NPT	Male	4 3/4"	00000000	000000

Adjustable Hazardous Location Flow Switches for Water, Air, and Inert Gas

For applications with a variable flow rate in environments with flammable gases and combustible dust, these UL-listed switches have an adjustment screw to alter the set point. They activate or deactivate equipment when the flow rate reaches your set point. All are single pole, double throw (SPDT) and can be installed to turn one circuit from “off” to “on” (normally open) or from “on” to “off” (normally closed).

Switch with a brass body meets NEC Class I, Divisions 1 and 2, Groups B, C, and D; and NEC Class II, Divisions 1 and 2, Groups E, F, and G.

Switch with a 304 stainless steel body is more corrosion resistant than the switch with a brass body. It meets NEC Class I, Divisions 1 and 2, Groups A, B, C, and D; and NEC Class II, Divisions 1 and 2, Groups E, F, and G.

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

			Set Point						Conduit
Pipe Size	Thread Type	Gender	For Water, gpm	For Air and Inert Gas, scfm	Max. Pressure	Temp. Range, °F	Voltage	Current	Trade Size	Thread Type	Gender	End-to-End Lg.		Each
Brass Body
1/2	NPT	Female	0.04 to 0.75	0.18 to 2.7	1450 psi @ 70° F	-4° to 220°	120V AC/ 240V AC	5 A @ 120 V AC	3/4	NPT	Male	3 5/8"	00000000	0000000
304 Stainless Steel Body
1/2	NPT	Female	0.04 to 0.75	0.18 to 2.7	1450 psi @ 70° F	-4° to 220°	120V AC/ 240V AC	5 A @ 120 V AC	3/4	NPT	Male	3 5/8"	00000000	000000

Flow Switches with Indicator for Water

For flow monitoring at a glance, these switches have a plastic window with a rotor indicator that spins when flow is present. They activate or deactivate equipment when the flow rate reaches your set point. All have an adjustment screw for altering the set point to suit your application. Switches are single pole, double throw (SPDT) and can be installed to turn one circuit from "off" to "on" (normally open) or from "on" to "off" (normally closed).

Switches with a polypropylene body are lighter than sights with a metal body.

Switches with a 316 stainless steel body are more corrosion resistant than switches with a brass body.

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

Polypropylene Plastic Body
Pipe Size	Thread Type	Gender	Set Point, gpm	Max. Pressure	Temp. Range, °F	Voltage	Current	End-to-End Lg.		Each
1/4	NPT	Female	0.1 to 5	100 psi @ 70° F	33° to 180°	120V AC	0.3 A @ 120 V AC	3 1/16"	0000000	0000000
1/2	NPT	Female	1.5 to 20	100 psi @ 70° F	33° to 180°	120V AC	0.3 A @ 120 V AC	3 1/16"	0000000	000000
Brass Body
1/4	NPT	Female	0.1 to 5	200 psi @ 70° F	33° to 212°	120V AC	0.3 A @ 120 V AC	3"	0000000	000000
1/2	NPT	Female	1.5 to 20	200 psi @ 70° F	33° to 212°	120V AC	0.3 A @ 120 V AC	3"	0000000	000000
3/4	NPT	Female	5 to 30	200 psi @ 70° F	33° to 212°	120V AC	0.3 A @ 120 V AC	3 15/16"	0000000	000000
1	NPT	Female	8 to 60	200 psi @ 70° F	33° to 212°	120V AC	0.3 A @ 120 V AC	3 15/16"	0000000	000000
316 Stainless Steel Body
1/2	NPT	Female	1.5 to 20	200 psi @ 70° F	33° to 212°	120V AC	0.3 A @ 120 V AC	3"	0000000	000000
3/4	NPT	Female	5 to 30	200 psi @ 70° F	33° to 212°	120V AC	0.3 A @ 120 V AC	3 15/16"	0000000	000000
1	NPT	Female	8 to 60	200 psi @ 70° F	33° to 212°	120V AC	0.3 A @ 120 V AC	3 15/16"	0000000	000000

Flow Transmitters for Water

Send flow-rate readings to data recorders, loggers, and displays.

Transmitters with a 316 stainless steel body are more corrosion resistant than transmitters with a brass or polypropylene body.

								Output
Pipe Connections	End-to-End Lg.	Flow Range, gpm	Accuracy	Max. Pressure	Temp. Range, °F	Seal Material	Mounting Orientation	Signal Connection	Signal, mA	Current	Wire Lead Lg.		Each
Polypropylene Plastic Body
Gallons per Minute
1/4 NPT Female	3 1/16"	0.1 to 5	±7%	100 psi @ 70° F	33° to 180°	Fluoroelastomer Rubber	Horizontal, Vertical	Wire Leads	70	0.008 A @ 24 V DC	24"	0000000	0000000
1/2 NPT Female	3 1/16"	1.5 to 20	±15%	100 psi @ 70° F	33° to 180°	Fluoroelastomer Rubber	Horizontal, Vertical	Wire Leads	70	0.008 A @ 24 V DC	24"	0000000	000000
Brass Body
Gallons per Minute
1/4 NPT Female	3"	0.1 to 5	±7%	200 psi @ 70° F	33° to 212°	Fluoroelastomer Rubber	Horizontal, Vertical	Wire Leads	70	0.008 A @ 24 V DC	24"	0000000	000000
1/2 NPT Female	3"	1.5 to 20	±15%	200 psi @ 70° F	33° to 212°	Fluoroelastomer Rubber	Horizontal, Vertical	Wire Leads	70	0.008 A @ 24 V DC	24"	0000000	000000
1 NPT Female	3 15/16"	8 to 60	±15%	200 psi @ 70° F	33° to 212°	Fluoroelastomer Rubber	Horizontal, Vertical	Wire Leads	70	0.008 A @ 24 V DC	24"	0000000	000000
316 Stainless Steel Body
Gallons per Minute
1/2 NPT Female	3"	1.5 to 20	±15%	200 psi @ 70° F	33° to 212°	Fluoroelastomer Rubber	Horizontal, Vertical	Wire Leads	70	0.008 A @ 24 V DC	24"	0000000	000000
3/4 NPT Female	3 15/16"	5 to 30	±15%	200 psi @ 70° F	33° to 212°	Fluoroelastomer Rubber	Horizontal, Vertical	Wire Leads	70	0.008 A @ 24 V DC	24"	0000000	000000
1 NPT Female	3 15/16"	8 to 60	±15%	200 psi @ 70° F	33° to 212°	Fluoroelastomer Rubber	Horizontal, Vertical	Wire Leads	70	0.008 A @ 24 V DC	24"	0000000	000000