Thermocouple Plugs | McMaster-Carr

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Thermocouple Sensor Connection

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Flat-Pin Mini Thermocouple Connector

Round-Pin Thermocouple Connector

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For Wire Gauge

DFARS Specialty Metals

Exempt

Export Control Classification Number (ECCN)

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REACH

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

Yes

Panel Cutout Height

1 1/4"

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Compliant

Distance Between Pins

Panel Cutout Width

Panel Cutout Diameter

Knockout Trade Size

Minimum Temperature

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 Connection		Female Connection
	Thermocouple Type	For Max. Wire Ga.	Color	Distance Between Pins	Body	Contact		Each		Each
Flat-Pin Mini Thermocouple Connectors—400° F Max. Temp.







				Screw-Terminal Wire Connection

				B	24	White	0.313"	Plastic	Copper	3869K117	00000	3869K125	00000


				C	23	Red	0.313"	Plastic	Tungsten	3869K143	00000	3869K144	00000
				E	24	Purple	0.313"	Plastic	Nickel	3869K113	0000	3869K121	0000
				J	24	Black	0.313"	Plastic	Iron	3869K33	0000	3869K32	0000
				K	24	Yellow	0.313"	Plastic	Nickel	3869K35	0000	3869K34	0000
				N	24	Orange	0.313"	Plastic	Nickel	3869K112	0000	3869K119	0000
				R	24	Green	0.313"	Plastic	Copper	3869K114	0000	3869K122	0000
				S	24	Green	0.313"	Plastic	Copper	3869K115	0000	3869K123	0000
				T	24	Blue	0.313"	Plastic	Copper	3869K37	0000	3869K36	0000
				U	24	White	0.313"	Plastic	Tungsten	3869K116	0000	3869K124	0000


				Flat-Pin Mini Thermocouple Connectors—800° F Max. Temp.







								Screw-Terminal Wire Connection

								J	24	Red	0.313"	Plastic	Iron	3869K41	0000	3869K44	0000


								K	24	Red	0.313"	Plastic	Nickel	3869K42	0000	3869K45	0000
								T	24	Red	0.313"	Plastic	Copper	3869K43	0000	3869K46	0000


								Round-Pin Thermocouple Connectors—400° F Max. Temp.







												Screw-Terminal Wire Connection

												B	14	White	0.438"	Plastic	Copper	3869K133	0000	3869K141	0000


												C	14	Brown	0.438"	Plastic	Tungsten	3869K134	00000	3869K142	00000
												E	14	Purple	0.438"	Plastic	Nickel	3869K128	0000	3869K136	0000
												J	14	Black	0.438"	Plastic	Iron	3869K23	0000	3869K22	0000
												K	14	Yellow	0.438"	Plastic	Nickel	3869K25	0000	3869K24	0000
												N	14	Orange	0.438"	Plastic	Nickel	3869K127	0000	3869K135	0000
												R	14	Green	0.438"	Plastic	Copper	3869K129	0000	3869K137	0000
												S	14	Green	0.438"	Plastic	Copper	3869K131	0000	3869K138	0000
												T	14	Blue	0.438"	Plastic	Copper	3869K27	0000	3869K26	0000
												U	14	White	0.438"	Plastic	Tungsten	3869K132	0000	3869K139	0000


Round-Pin Thermocouple Connectors—800° F Max. Temp.







												Screw-Terminal Wire Connection

												J	14	Red	0.438"	Plastic	Iron	3869K51	00000	3869K54	00000


												K	14	Red	0.438"	Plastic	Nickel	3869K52	00000	3869K55	00000
												T	14	Red	0.438"	Plastic	Copper	3869K53	00000	3869K56	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 Connection			Female Connection
	Thermocouple Type	For Max. Wire Ga.	Color	Distance Between Pins	Body	Contact	Pin Lg.		Each		Each
Round-Pin Thermocouple Connectors—400° F Max. Temp.







				Screw-Terminal Wire Connection

				J	14	Black	0.438"	Plastic	Iron	9/16"	3869K16	00000	3869K13	00000


				K	14	Yellow	0.438"	Plastic	Nickel	9/16"	3869K17	0000	3869K14	0000
				T	14	Blue	0.438"	Plastic	Copper	9/16"	3869K18	0000	3869K15	0000


				Round-Pin Thermocouple Connectors—800° F Max. Temp.







								Screw-Terminal Wire Connection

								J	14	Red	0.438"	Plastic	Iron	9/16"	3869K87	00000	3869K63	00000


								K	14	Red	0.438"	Plastic	Nickel	9/16"	3869K58	00000	3869K64	00000
								T	14	Red	0.438"	Plastic	Copper	9/16"	3869K59	00000	3869K65	00000


								Round-Pin Thermocouple Connectors—1,000° F Max. Temp.







												Screw-Terminal Wire Connection

												J	14	White	0.442"	Ceramic	Iron	1/2"	3869K91	00000	3869K94	00000


												K	14	White	0.442"	Ceramic	Nickel	1/2"	3869K92	00000	3869K95	00000
												T	14	White	0.442"	Ceramic	Copper	1/2"	3869K88	00000	3869K93	00000

Panel-Mount Thermocouple Connector Strips

Create an easy way to plug in multiple thermocouples—these connector 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 connector 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.

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

Round-Pin Thermocouple Connector Connection—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.

Mounting Frames—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.

	Connectors											Mounting Frames
				For Panel Cutout			Material
	Thermocouple Type	No. of Connections	For Max. Wire Ga.	Wd.	Ht.	Color	Body	Contact	Fasteners Included		Each		Each
Female Flat-Pin Mini Thermocouple Connectors—400° F Max. Temp.
Flat-Pin Strip






				Screw-Terminal Wire Connection

				J	2	24	1 1/4"	1"	Black	Plastic	Iron	Yes	3921K21	000000	5991N11	000000


				J	4	24	2 5/8"	1"	Black	Plastic	Iron	Yes	3921K24	00000	5991N12	00000
				J	6	24	4"	1"	Black	Plastic	Iron	Yes	3921K27	00000	5991N13	00000
				J	8	24	5 3/8"	1"	Black	Plastic	Iron	Yes	3921K31	00000	5991N14	00000
				K	2	24	1 1/4"	1"	Yellow	Plastic	Nickel	Yes	3921K22	00000	5991N11	00000
				K	4	24	2 5/8"	1"	Yellow	Plastic	Nickel	Yes	3921K25	00000	5991N12	00000
				K	6	24	4"	1"	Yellow	Plastic	Nickel	Yes	3921K28	00000	5991N13	00000
				K	8	24	5 3/8"	1"	Yellow	Plastic	Nickel	Yes	3921K32	00000	5991N14	00000
				T	2	24	1 1/4"	1"	Blue	Plastic	Copper	Yes	3921K23	00000	5991N11	00000
				T	4	24	2 5/8"	1"	Blue	Plastic	Copper	Yes	3921K26	00000	5991N12	00000
				T	6	24	4"	1"	Blue	Plastic	Copper	Yes	3921K29	00000	5991N13	00000


				T	8	24	5 3/8"	1"	Blue	Plastic	Copper	Yes	3921K33	00000	5991N14	00000


				Female Flat-Pin Mini Thermocouple Connectors—800° F Max. Temp.
				Flat-Pin Strip






								Screw-Terminal Wire Connection

								J	2	24	1 1/4"	1"	Red	Plastic	Iron	Yes	3921K211	00000	5991N11	00000


								J	4	24	2 5/8"	1"	Red	Plastic	Iron	Yes	3921K212	00000	5991N12	00000
								J	6	24	4"	1"	Red	Plastic	Iron	Yes	3921K213	00000	5991N13	00000
								J	8	24	5 3/8"	1"	Red	Plastic	Iron	Yes	3921K214	000000	5991N14	00000
								K	2	24	1 1/4"	1"	Red	Plastic	Nickel	Yes	3921K215	00000	5991N11	00000
								K	4	24	2 5/8"	1"	Red	Plastic	Nickel	Yes	3921K216	00000	5991N12	00000
								K	6	24	4"	1"	Red	Plastic	Nickel	Yes	3921K217	00000	5991N13	00000
								K	8	24	5 3/8"	1"	Red	Plastic	Nickel	Yes	3921K218	000000	5991N14	00000


								Female Round-Pin Thermocouple Connectors—400° F Max. Temp.
								Round-Pin Strip






												Screw-Terminal Wire Connection

												J	2	16	1 5/16"	1 1/4"	Black	Plastic	Iron	Yes	3921K41	00000	5991N15	00000


												J	4	16	2 13/16"	1 1/4"	Black	Plastic	Iron	Yes	3921K44	00000	5991N16	00000
												J	6	16	4 5/16"	1 1/4"	Black	Plastic	Iron	Yes	3921K47	00000	5991N17	00000
J												8	16	5 13/16"	1 1/4"	Black	Plastic	Iron	Yes	3921K51	00000	5991N18	00000
J	10											16	7 5/16"	1 1/4"	Black	Plastic	Iron	Yes	3921K224	00000	5991N19	00000
J	12											16	8 13/16"	1 1/4"	Black	Plastic	Iron	Yes	3921K226	000000	5991N21	00000
K	2											16	1 5/16"	1 1/4"	Yellow	Plastic	Nickel	Yes	3921K42	00000	5991N15	00000
K	4											16	2 13/16"	1 1/4"	Yellow	Plastic	Nickel	Yes	3921K45	00000	5991N16	00000
K	6	16										4 5/16"	1 1/4"	Yellow	Plastic	Nickel	Yes	3921K48	00000	5991N17	00000
K	8	16	5 13/16"									1 1/4"	Yellow	Plastic	Nickel	Yes	3921K52	00000	5991N18	00000
K	10	16	7 5/16"									1 1/4"	Yellow	Plastic	Nickel	Yes	3921K233	00000	5991N19	00000


K	12	16	8 13/16"									1 1/4"	Yellow	Plastic	Nickel	Yes	3921K235	000000	5991N21	00000
T	2	16	1 5/16"									1 1/4"	Blue	Plastic	Copper	Yes	3921K43	00000	5991N15	00000
T	4	16	2 13/16"									1 1/4"	Blue	Plastic	Copper	Yes	3921K46	00000	5991N16	00000
T	6	16	4 5/16"									1 1/4"	Blue	Plastic	Copper	Yes	3921K49	00000	5991N17	00000
T	8	16	5 13/16"									1 1/4"	Blue	Plastic	Copper	Yes	3921K53	00000	5991N18	00000
T	10	16	7 5/16"									1 1/4"	Blue	Plastic	Copper	Yes	3921K237	00000	5991N19	00000
T	12	16	8 13/16"									1 1/4"	Blue	Plastic	Copper	Yes	3921K238	000000	5991N21	00000


Female Round-Pin Thermocouple Connectors—800° F Max. Temp.
Round-Pin Strip






												Screw-Terminal Wire Connection

				J								2	16	1 5/16"	1 1/4"	Red	Plastic	Iron	Yes	3921K219	00000	5991N15	00000


				J	4							16	2 13/16"	1 1/4"	Red	Plastic	Iron	Yes	3921K221	00000	5991N16	00000
				J	6							16	4 5/16"	1 1/4"	Red	Plastic	Iron	Yes	3921K222	00000	5991N17	00000
				J	8	16						5 13/16"	1 1/4"	Red	Plastic	Iron	Yes	3921K223	000000	5991N18	00000
				J	10	16	7 5/16"					1 1/4"	Red	Plastic	Iron	Yes	3921K225	000000	5991N19	00000
				J	12	16	8 13/16"					1 1/4"	Red	Plastic	Iron	Yes	3921K227	000000	5991N21	00000
				K	2	16	1 5/16"					1 1/4"	Red	Plastic	Nickel	Yes	3921K228	00000	5991N15	00000
				K	4	16	2 13/16"					1 1/4"	Red	Plastic	Nickel	Yes	3921K229	00000	5991N16	00000
				K	6	16	4 5/16"					1 1/4"	Red	Plastic	Nickel	Yes	3921K231	00000	5991N17	00000
				K	8	16	5 13/16"					1 1/4"	Red	Plastic	Nickel	Yes	3921K232	000000	5991N18	00000
				K	10	16	7 5/16"					1 1/4"	Red	Plastic	Nickel	Yes	3921K234	000000	5991N19	00000


				K	12	16	8 13/16"					1 1/4"	Red	Plastic	Nickel	Yes	3921K236	000000	5991N21	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 Ga.	For Panel Cutout Dia.	For Knockout Trade Size	Color	Body	Contact	Fasteners Included	Includes		Each
Female Flat-Pin Mini Thermocouple Connectors—400° F Max. Temp.







				Screw-Terminal Wire Connection

				J	1	20	7/8", 1 1/8"	1/2, 3/4	Black	Plastic	Iron	Yes	Knockout Adapter	3869K47	000000


				K	1	20	7/8", 1 1/8"	1/2, 3/4	Yellow	Plastic	Nickel	Yes	Knockout Adapter	3869K48	00000
				T	1	20	7/8", 1 1/8"	1/2, 3/4	Blue	Plastic	Copper	Yes	Knockout Adapter	3869K49	00000


				Female Flat-Pin Mini Thermocouple Connectors—800° F Max. Temp.







								Screw-Terminal Wire Connection

								J	1	20	7/8", 1 1/8"	1/2, 3/4	Red	Plastic	Iron	Yes	Knockout Adapter	3869K101	00000


								K	1	20	7/8", 1 1/8"	1/2, 3/4	Red	Plastic	Nickel	Yes	Knockout Adapter	3869K102	00000
								T	1	20	7/8", 1 1/8"	1/2, 3/4	Red	Plastic	Copper	Yes	Knockout Adapter	3869K103	00000


								Female Round-Pin Thermocouple Connectors—400° F Max. Temp.







												Screw-Terminal Wire Connection

												J	1	14	1 1/8"	3/4	Black	Plastic	Iron	Yes	—	3869K66	00000


												K	1	14	1 1/8"	3/4	Yellow	Plastic	Nickel	Yes	—	3869K67	00000
												T	1	14	1 1/8"	3/4	Blue	Plastic	Copper	Yes	—	3869K68	00000


												Female Round-Pin Thermocouple Connectors—800° F Max. Temp.







																Screw-Terminal Wire Connection

																J	1	14	1 1/8"	3/4	Red	Plastic	Iron	Yes	—	3869K104	00000


																K	1	14	1 1/8"	3/4	Red	Plastic	Nickel	Yes	—	3869K106	00000
T																1	14	1 1/8"	3/4	Red	Plastic	Copper	Yes	—	3869K108	00000


Female Round-Pin Thermocouple Connectors—1,000° F Max. Temp.







																Screw-Terminal Wire Connection

																J	1	14	1 1/8"	3/4	White	Ceramic	Iron	Yes	—	3869K105	00000


																K	1	14	1 1/8"	3/4	White	Ceramic	Nickel	Yes	—	3869K107	00000
																T	1	14	1 1/8"	3/4	White	Ceramic	Copper	Yes	—	3869K109	00000

Thermocouple Connector Adapters

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

						Material
	Thermocouple Type	Max. Temp., ° 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	3869K221	000000


		C	400	Brown	7/16"	0.438"	Plastic	Tungsten	3869K222	00000
		E	400	Purple	7/16"	0.438"	Plastic	Nickel	3869K216	00000
		J	400	Black	7/16"	0.438"	Plastic	Iron	3869K69	00000
		K	400	Yellow	7/16"	0.438"	Plastic	Nickel	3869K71	00000
		N	400	Orange	7/16"	0.438"	Plastic	Nickel	3869K215	00000
		R	400	Green	7/16"	0.438"	Plastic	Platinum	3869K217	00000
		S	400	Green	7/16"	0.438"	Plastic	Platinum	3869K218	00000
		T	400	Blue	7/16"	0.438"	Plastic	Copper	3869K214	00000
		U	400	White	7/16"	0.438"	Plastic	Copper	3869K219	00000

Conduit-Mount Thermocouple Connector Strips


Flat-Pin Strip	Round-Pin Strip

Already mounted in a conduit box, these connector 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 connector strip from the conduit box, then pull your wiring through. Attach the box to your conduit, wire up the back of the connector 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 Ga.	Lg.	Wd.	Ht.	Color	Body	Contact	Pipe Size	Thread Type	Gender		Each
Female Flat-Pin Mini Thermocouple Connectors—400° F Max. Temp.







				Screw-Terminal Wire Connection

				J	6	24	4 9/16"	2 13/16"	2 1/4"	Black	Aluminum	Iron	3/4	NPT	Female	5974N11	000000


				K	6	24	4 9/16"	2 13/16"	2 1/4"	Yellow	Aluminum	Nickel	3/4	NPT	Female	5974N12	00000


				Female Round-Pin Thermocouple Connectors—400° F Max. Temp.







								Screw-Terminal Wire Connection

								J	6	20	4 9/16"	2 13/16"	2 1/4"	Black	Aluminum	Iron	3/4	NPT	Female	5974N13	000000


								K	6	20	4 9/16"	2 13/16"	2 1/4"	Yellow	Aluminum	Nickel	3/4	NPT	Female	5974N14	000000

Thermocouple Connector Covers

Shown with Two

Covers on Mated

Pair of

Connectors

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.

	Overall Lg.	Material		Each
For Round-Pin Thermocouple Connector Connection



	-35 to 212	2 3/4"	Neoprene	6146N11	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	Temp. Range, ° F	Pipe Size	Thread Type	Gender	AWG	Lg.	Body	Cable	Cable Lg., ft.	Max. Cable Temp., ° F		Each
Female Flat-Pin Mini Thermocouple Connectors







				Wire Lead Connection

				J	1	-40 to 390	1/2	NPT	Male	24	2"	Stainless Steel	FEP	10	400	3877K21	0000000


				K	1	-40 to 390	1/2	NPT	Male	24	2"	Stainless Steel	FEP	10	400	3877K22	000000
				T	1	-40 to 390	1/2	NPT	Male	24	2"	Stainless Steel	FEP	10	400	3877K23	000000


				Female Round-Pin Thermocouple Connectors







								Wire Lead Connection

								J	1	-40 to 390	3/4	NPT	Male	24	2"	Stainless Steel	FEP	10	400	3877K24	000000


								K	1	-40 to 390	3/4	NPT	Male	24	2"	Stainless Steel	FEP	10	400	3877K25	000000
								T	1	-40 to 390	3/4	NPT	Male	24	2"	Stainless Steel	FEP	10	400	3877K26	000000