Thermocouple Plugs | McMaster-Carr

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Flat-Pin Mini Thermocouple Connector

Round-Pin Thermocouple Connector

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Flat-Pin Mini Thermocouple Connector

Round-Pin Thermocouple Connector

Maximum Temperature

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For Maximum Wire Gauge

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7/16"

1/2"

9/16"

DFARS Specialty Metals

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Export Control Classification Number (ECCN)

REACH

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Distance Between Pins

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Panel Cutout Diameter

Panel Cutout Width

Knockout Trade Size

Pipe Size

166 Products

Thermocouple Connectors

Flat-Pin Mini Male Connector

Flat-Pin Mini Female Connector

Round-Pin Male Connector

Round-Pin Female Connector

Simplify connecting your thermocouple to thermometers and control panels—these connectors give your thermocouple a plug-in connection. To attach them to your thermocouple, first remove the panel on these connectors to expose the terminals. Then insert your thermocouple wire leads, tighten the terminals, and reattach the panel.

				Material		Male			Female
Thermocouple Type	For Max. Wire Gauge	Color	Distance Between Pins	Body	Contact	Pin Lg.		Each		Each
Flat-Pin Mini Thermocouple Connector—400° F Max. Temp.
Screw Terminals
B	24	White	0.313"	Plastic	Copper	1/2"	00000000	00000	00000000	00000
C	23	Red	0.313"	Plastic	Tungsten	1/2"	00000000	00000	00000000	00000
E	24	Purple	0.313"	Plastic	Nickel	1/2"	00000000	0000	00000000	0000
J	24	Black	0.313"	Plastic	Iron	1/2"	0000000	0000	0000000	0000
K	24	Yellow	0.313"	Plastic	Nickel	1/2"	0000000	0000	0000000	0000
N	24	Orange	0.313"	Plastic	Nickel	1/2"	00000000	0000	00000000	0000
R	24	Green	0.313"	Plastic	Copper	1/2"	00000000	0000	00000000	0000
S	24	Green	0.313"	Plastic	Copper	1/2"	00000000	0000	00000000	0000
T	24	Blue	0.313"	Plastic	Copper	1/2"	0000000	0000	0000000	0000
U	24	White	0.313"	Plastic	Tungsten	1/2"	00000000	0000	00000000	0000
Flat-Pin Mini Thermocouple Connector—800° F Max. Temp.
Screw Terminals
J	24	Red	0.313"	Plastic	Iron	1/2"	0000000	0000	0000000	0000
K	24	Red	0.313"	Plastic	Nickel	1/2"	0000000	0000	0000000	0000
T	24	Red	0.313"	Plastic	Copper	1/2"	0000000	0000	0000000	0000
Round-Pin Thermocouple Connector—400° F Max. Temp.
Screw Terminals
B	14	White	0.438"	Plastic	Copper	1/2"	00000000	0000	00000000	0000
C	14	Brown	0.438"	Plastic	Tungsten	1/2"	00000000	00000	00000000	00000
E	14	Purple	0.438"	Plastic	Nickel	1/2"	00000000	0000	00000000	0000
J	14	Black	0.438"	Plastic	Iron	9/16"	0000000	0000	0000000	0000
K	14	Yellow	0.438"	Plastic	Nickel	9/16"	0000000	0000	0000000	0000
N	14	Orange	0.438"	Plastic	Nickel	1/2"	00000000	0000	00000000	0000
R	14	Green	0.438"	Plastic	Copper	1/2"	00000000	0000	00000000	0000
S	14	Green	0.438"	Plastic	Copper	1/2"	00000000	0000	00000000	0000
T	14	Blue	0.438"	Plastic	Copper	9/16"	0000000	0000	0000000	0000
U	14	White	0.438"	Plastic	Tungsten	1/2"	00000000	0000	00000000	0000
Round-Pin Thermocouple Connector—800° F Max. Temp.
Screw Terminals
J	14	Red	0.438"	Plastic	Iron	9/16"	0000000	00000	0000000	00000
K	14	Red	0.438"	Plastic	Nickel	9/16"	0000000	00000	0000000	00000
T	14	Red	0.438"	Plastic	Copper	9/16"	0000000	00000	0000000	00000

Quick-Wire Thermocouple Connectors

Male Connector

Female Connector

No need to take these connectors apart to wire them—just insert your wire leads and tighten the terminals to quickly give your thermocouple a plug-in connection. Choose a connector with the same thermocouple type as the thermocouple you’re attaching. You should also make sure the equipment you’re plugging these connectors into is also compatible with the same thermocouple type.

				Material		Male			Female
Thermocouple Type	For Max. Wire Gauge	Color	Distance Between Pins	Body	Contact	Pin Lg.		Each		Each
Round-Pin Thermocouple Connector—400° F Max. Temp.
Screw Terminals
J	14	Black	0.438"	Plastic	Iron	9/16"	0000000	00000	0000000	00000
K	14	Yellow	0.438"	Plastic	Nickel	9/16"	0000000	0000	0000000	0000
T	14	Blue	0.438"	Plastic	Copper	9/16"	0000000	0000	0000000	0000
Round-Pin Thermocouple Connector—800° F Max. Temp.
Screw Terminals
J	14	Red	0.438"	Plastic	Iron	9/16"	0000000	00000	0000000	00000
K	14	Red	0.438"	Plastic	Nickel	9/16"	0000000	00000	0000000	00000
T	14	Red	0.438"	Plastic	Copper	9/16"	0000000	00000	0000000	00000
Round-Pin Thermocouple Connector—1,000° F Max. Temp.
Screw Terminals
J	14	White	0.442"	Ceramic	Iron	1/2"	0000000	00000	0000000	00000
K	14	White	0.442"	Ceramic	Nickel	1/2"	0000000	00000	0000000	00000
T	14	White	0.442"	Ceramic	Copper	1/2"	0000000	00000	0000000	00000

Panel-Mount Thermocouple Connection Strips

Flat-Pin Strip

Round-Pin Strip

Create an easy way to plug in multiple thermocouples—these connection strips mount directly into your control panel. With at least two connections on each strip, you can plug in multiple thermocouples to monitor temperature at different points in your process. Each socket is numbered to help identify thermocouples and keep your wires organized. Choose a connection strip with a thermocouple type that matches the type of thermocouple you’re plugging in. You should also make sure the equipment you’re connecting it to is also compatible with the same thermocouple type.

Connection strips for flat-pin mini thermocouple connectors install from the rear of your panel. They snap into place with spring clips.

Connection strips for round-pin thermocouple connectors install from the front of your panel. Just tighten the screws on the front of the strip and T-nuts will hold it in place against your panel.

Add a mounting frame (sold separately) if your panel opening is larger than the cutout dimensions. When using a mounting frame, install your connection strip into the frame before attaching the entire assembly to your panel opening. Use the frame's mounting holes to secure your fasteners.

Connection Strips
			For Panel Cutout			Material					Mounting Frames
Thermocouple Type	No. of Connections	For Max. Wire Gauge	Wd.	Ht.	Color	Body	Contact	Fasteners Included		Each		Each
Female Flat-Pin Mini Thermocouple Connector—400° Max. Temp.
Screw Terminals
J	2	24	1 1/4"	1"	Black	Plastic	Iron	Yes	0000000	000000	0000000	000000
J	4	24	2 5/8"	1"	Black	Plastic	Iron	Yes	0000000	00000	0000000	00000
J	6	24	4"	1"	Black	Plastic	Iron	Yes	0000000	00000	0000000	00000
J	8	24	5 3/8"	1"	Black	Plastic	Iron	Yes	0000000	00000	0000000	00000
K	2	24	1 1/4"	1"	Yellow	Plastic	Nickel	Yes	0000000	00000	0000000	00000
K	4	24	2 5/8"	1"	Yellow	Plastic	Nickel	Yes	0000000	00000	0000000	00000
K	6	24	4"	1"	Yellow	Plastic	Nickel	Yes	0000000	00000	0000000	00000
K	8	24	5 3/8"	1"	Yellow	Plastic	Nickel	Yes	0000000	00000	0000000	00000
T	2	24	1 1/4"	1"	Blue	Plastic	Copper	Yes	0000000	00000	0000000	00000
T	4	24	2 5/8"	1"	Blue	Plastic	Copper	Yes	0000000	00000	0000000	00000
T	6	24	4"	1"	Blue	Plastic	Copper	Yes	0000000	00000	0000000	00000
T	8	24	5 3/8"	1"	Blue	Plastic	Copper	Yes	0000000	00000	0000000	00000
Female Flat-Pin Mini Thermocouple Connector—800° Max. Temp.
Screw Terminals
J	2	24	1 1/4"	1"	Red	Plastic	Iron	Yes	00000000	00000	0000000	00000
J	4	24	2 5/8"	1"	Red	Plastic	Iron	Yes	00000000	00000	0000000	00000
J	6	24	4"	1"	Red	Plastic	Iron	Yes	00000000	00000	0000000	00000
J	8	24	5 3/8"	1"	Red	Plastic	Iron	Yes	00000000	000000	0000000	00000
K	2	24	1 1/4"	1"	Red	Plastic	Nickel	Yes	00000000	00000	0000000	00000
K	4	24	2 5/8"	1"	Red	Plastic	Nickel	Yes	00000000	00000	0000000	00000
K	6	24	4"	1"	Red	Plastic	Nickel	Yes	00000000	00000	0000000	00000
K	8	24	5 3/8"	1"	Red	Plastic	Nickel	Yes	00000000	000000	0000000	00000
Female Round-Pin Thermocouple Connector—400° Max. Temp.
Screw Terminals
J	2	16	1 5/16"	1 1/4"	Black	Plastic	Iron	Yes	0000000	00000	0000000	00000
J	4	16	2 13/16"	1 1/4"	Black	Plastic	Iron	Yes	0000000	00000	0000000	00000
J	6	16	4 5/16"	1 1/4"	Black	Plastic	Iron	Yes	0000000	00000	0000000	00000
J	8	16	5 13/16"	1 1/4"	Black	Plastic	Iron	Yes	0000000	00000	0000000	00000
J	10	16	7 5/16"	1 1/4"	Black	Plastic	Iron	Yes	00000000	00000	0000000	00000
J	12	16	8 13/16"	1 1/4"	Black	Plastic	Iron	Yes	00000000	000000	0000000	00000
K	2	16	1 5/16"	1 1/4"	Yellow	Plastic	Nickel	Yes	0000000	00000	0000000	00000
K	4	16	2 13/16"	1 1/4"	Yellow	Plastic	Nickel	Yes	0000000	00000	0000000	00000
K	6	16	4 5/16"	1 1/4"	Yellow	Plastic	Nickel	Yes	0000000	00000	0000000	00000
K	8	16	5 13/16"	1 1/4"	Yellow	Plastic	Nickel	Yes	0000000	00000	0000000	00000
K	10	16	7 5/16"	1 1/4"	Yellow	Plastic	Nickel	Yes	00000000	00000	0000000	00000
K	12	16	8 13/16"	1 1/4"	Yellow	Plastic	Nickel	Yes	00000000	000000	0000000	00000
T	2	16	1 5/16"	1 1/4"	Blue	Plastic	Copper	Yes	0000000	00000	0000000	00000
T	4	16	2 13/16"	1 1/4"	Blue	Plastic	Copper	Yes	0000000	00000	0000000	00000
T	6	16	4 5/16"	1 1/4"	Blue	Plastic	Copper	Yes	0000000	00000	0000000	00000
T	8	16	5 13/16"	1 1/4"	Blue	Plastic	Copper	Yes	0000000	00000	0000000	00000
T	10	16	7 5/16"	1 1/4"	Blue	Plastic	Copper	Yes	00000000	00000	0000000	00000
T	12	16	8 13/16"	1 1/4"	Blue	Plastic	Copper	Yes	00000000	000000	0000000	00000
Female Round-Pin Thermocouple Connector—800° Max. Temp.
Screw Terminals
J	2	16	1 5/16"	1 1/4"	Red	Plastic	Iron	Yes	00000000	00000	0000000	00000
J	4	16	2 13/16"	1 1/4"	Red	Plastic	Iron	Yes	00000000	00000	0000000	00000
J	6	16	4 5/16"	1 1/4"	Red	Plastic	Iron	Yes	00000000	00000	0000000	00000
J	8	16	5 13/16"	1 1/4"	Red	Plastic	Iron	Yes	00000000	000000	0000000	00000
J	10	16	7 5/16"	1 1/4"	Red	Plastic	Iron	Yes	00000000	000000	0000000	00000
J	12	16	8 13/16"	1 1/4"	Red	Plastic	Iron	Yes	00000000	000000	0000000	00000
K	2	16	1 5/16"	1 1/4"	Red	Plastic	Nickel	Yes	00000000	00000	0000000	00000
K	4	16	2 13/16"	1 1/4"	Red	Plastic	Nickel	Yes	00000000	00000	0000000	00000
K	6	16	4 5/16"	1 1/4"	Red	Plastic	Nickel	Yes	00000000	00000	0000000	00000
K	8	16	5 13/16"	1 1/4"	Red	Plastic	Nickel	Yes	00000000	000000	0000000	00000
K	10	16	7 5/16"	1 1/4"	Red	Plastic	Nickel	Yes	00000000	000000	0000000	00000
K	12	16	8 13/16"	1 1/4"	Red	Plastic	Nickel	Yes	00000000	000000	0000000	00000

Panel-Mount Thermocouple Connectors

Flat-Pin Connector

Round-Pin Connector

Create a connection point on a control panel to plug in thermocouples. These connectors can be wired and installed entirely from the front of your panel.

						Material
Thermocouple Type	No. of Connections	For Max. Wire Gauge	For Panel Cutout Dia.	For Knockout Trade Size	Color	Body	Contact	Fasteners Included	Includes		Each
Female Flat-Pin Mini Thermocouple Connector—400° F Max. Temp.
Screw Terminals
J	1	20	7/8", 1 1/8"	1/2, 3/4	Black	Plastic	Iron	Yes	Knockout Adapter	0000000	000000
K	1	20	7/8", 1 1/8"	1/2, 3/4	Yellow	Plastic	Nickel	Yes	Knockout Adapter	0000000	00000
T	1	20	7/8", 1 1/8"	1/2, 3/4	Blue	Plastic	Copper	Yes	Knockout Adapter	0000000	00000
Female Flat-Pin Mini Thermocouple Connector—800° F Max. Temp.
Screw Terminals
J	1	20	7/8", 1 1/8"	1/2, 3/4	Red	Plastic	Iron	Yes	Knockout Adapter	00000000	00000
K	1	20	7/8", 1 1/8"	1/2, 3/4	Red	Plastic	Nickel	Yes	Knockout Adapter	00000000	00000
T	1	20	7/8", 1 1/8"	1/2, 3/4	Red	Plastic	Copper	Yes	Knockout Adapter	00000000	00000
Female Round-Pin Thermocouple Connector—400° F Max. Temp.
Screw Terminals
J	1	14	1 1/8"	3/4	Black	Plastic	Iron	Yes	__	0000000	00000
K	1	14	1 1/8"	3/4	Yellow	Plastic	Nickel	Yes	__	0000000	00000
T	1	14	1 1/8"	3/4	Blue	Plastic	Copper	Yes	__	0000000	00000
Female Round-Pin Thermocouple Connector—800° F Max. Temp.
Screw Terminals
J	1	14	1 1/8"	3/4	Red	Plastic	Iron	Yes	__	00000000	00000
K	1	14	1 1/8"	3/4	Red	Plastic	Nickel	Yes	__	00000000	00000
T	1	14	1 1/8"	3/4	Red	Plastic	Copper	Yes	__	00000000	00000
Female Round-Pin Thermocouple Connector—1,000° F Max. Temp.
Screw Terminals
J	1	14	1 1/8"	3/4	White	Ceramic	Iron	Yes	__	00000000	00000
K	1	14	1 1/8"	3/4	White	Ceramic	Nickel	Yes	__	00000000	00000
T	1	14	1 1/8"	3/4	White	Ceramic	Copper	Yes	__	00000000	00000

Thermocouple Connector Adapters

Convert round-pin thermocouple connectors to flat-pin mini thermocouple connectors.

					Material
Thermocouple Type	Max. Temperature, ° F	Color	Pin Lg.	Distance Between Pins	Body	Contact		Each
Female Round-Pin Thermocouple Connector × Male Flat-Pin Mini Thermocouple Connector
B	400°	White	7/16"	0.438"	Plastic	Platinum	00000000	000000
C	400°	Brown	7/16"	0.438"	Plastic	Tungsten	00000000	00000
E	400°	Purple	7/16"	0.438"	Plastic	Nickel	00000000	00000
J	400°	Black	7/16"	0.438"	Plastic	Iron	0000000	00000
K	400°	Yellow	7/16"	0.438"	Plastic	Nickel	0000000	00000
N	400°	Orange	7/16"	0.438"	Plastic	Nickel	00000000	00000
R	400°	Green	7/16"	0.438"	Plastic	Platinum	00000000	00000
S	400°	Green	7/16"	0.438"	Plastic	Platinum	00000000	00000
T	400°	Blue	7/16"	0.438"	Plastic	Copper	00000000	00000
U	400°	White	7/16"	0.438"	Plastic	Copper	00000000	00000

Threaded Thermocouple Connectors

Flat-Pin Connector

Round-Pin Connector

Thread these connectors into a hole for an easy way to plug in a thermocouple. With the wire leads in the back, connect them to controllers, thermometers, and other temperature reading devices.

			Process			Wire Lead		Material
Thermocouple Type	No. of Connections	Temperature Range, °F	Pipe Size	Thread Type	Gender	Gauge	Lg.	Body	Cable	Cable Lg., ft.	Max. Cable Temperature, °F		Each
Female Flat-Pin Mini Thermocouple Connector
Wire Leads
J	1	-40° to 390°	1/2	NPT	Male	24	2"	Stainless Steel	FEP Plastic	10	400°	0000000	0000000
K	1	-40° to 390°	1/2	NPT	Male	24	2"	Stainless Steel	FEP Plastic	10	400°	0000000	000000
T	1	-40° to 390°	1/2	NPT	Male	24	2"	Stainless Steel	FEP Plastic	10	400°	0000000	000000
Female Round-Pin Thermocouple Connector
Wire Leads
J	1	-40° to 390°	3/4	NPT	Male	24	2"	Stainless Steel	FEP Plastic	10	400°	0000000	000000
K	1	-40° to 390°	3/4	NPT	Male	24	2"	Stainless Steel	FEP Plastic	10	400°	0000000	000000
T	1	-40° to 390°	3/4	NPT	Male	24	2"	Stainless Steel	FEP Plastic	10	400°	0000000	000000

Conduit-Mount Thermocouple Connection Strips

Flat-Pin Strip

Round-Pin Strip

Already mounted in a conduit box, these connection strips save you the effort of modifying a panel for installation. With six connections on each strip, you can plug in multiple thermocouples to monitor temperature at different points in your process. The sockets are numbered to help you identify thermocouples and keep your wires organized.

To install, remove the connection strip from the conduit box, then pull your wiring through. Attach the box to your conduit, wire up the back of the connection strip, and reattach it to the conduit box. Then just plug your thermocouples into the strip.

				Body				Material		Conduit Connection
Thermocouple Type	No. of Connections	For Max. Wire Gauge	Max. Temperature, °F	Lg.	Wd.	Ht.	Color	Body	Contact	Pipe Size	Thread Type	Gender		Each
Female Flat-Pin Mini Thermocouple Connector
Screw Terminals
J	6	24	400°	4 9/16"	2 13/16"	2 1/4"	Black	Aluminum	Iron	3/4	NPT	Female	0000000	000000
K	6	24	400°	4 9/16"	2 13/16"	2 1/4"	Yellow	Aluminum	Nickel	3/4	NPT	Female	0000000	00000
Female Round-Pin Thermocouple Connector
Screw Terminals
J	6	20	400°	4 9/16"	2 13/16"	2 1/4"	Black	Aluminum	Iron	3/4	NPT	Female	0000000	000000
K	6	20	400°	4 9/16"	2 13/16"	2 1/4"	Yellow	Aluminum	Nickel	3/4	NPT	Female	0000000	000000

Thermocouple Connector Covers

Shown with Two Covers on Mated Pair of Connectors

Cover

Shield thermocouple connectors from dust and debris. Just slide these neoprene covers over your connector and route the wires through the opening. Use two to fully protect a mated pair of connectors—part of the covers will overlap to form a seal.

For Round-Pin Thermocouple Connectors
Temp. Range, °F	Overall Lg.	Material		Each
-35° to 212°	2 3/4"	Neoprene Rubber	0000000	00000