Thermocouple Lead Wire | McMaster-Carr

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110 Products

Thermocouple Wire

Solid Thermocouple Wire

Stranded Thermocouple Wire

Make your own thermocouples.

Stranded wire is more flexible than solid wire.

FEP insulation and jacket is abrasion and chemical resistant.

Fiberglass insulation and jacket is rated for higher temperatures than FEP and is highly chemical resistant.

Polyimide insulation and jacket stands up to humid conditions and rapid temperature changes.

Vitreous silica insulation and jacket resists continuous exposure to temperatures up to 1600° F.

Ceramic fiber insulation and jacket withstands continuous exposure to temperatures up to 2200° F.

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

			Wire				Wire Color					Per Ft.
Thermocouple Type	Min. Temp., °F	Max. Temp., °F	Gauge	Dia.	Max. Jacket Temp., °F	No. of Wires	Positive	Negative	Jacket Color	Lengths, ft.		1-99	100-Up
Solid Wire
FEP Insulation and Jacket
J	Not Rated	400°	16	0.051"	400°	2	White	Red	Brown	10, 20, 50, 100	0000000	00000	00000
J	Not Rated	400°	20	0.032"	400°	2	White	Red	Brown	10, 20, 50, 100	0000000	0000	0000
J	Not Rated	400°	24	0.02"	400°	2	White	Red	Brown	10, 20, 50, 100	0000000	0000	000
J	Not Rated	400°	30	0.01"	400°	2	White	Red	Brown	10, 20, 50, 100	00000000	0000	0000
K	Not Rated	400°	16	0.051"	400°	2	Yellow	Red	Brown	10, 20, 50, 100	0000000	0000	0000
K	Not Rated	400°	18	0.04"	400°	2	Yellow	Red	Brown	10, 20, 50, 100	00000000	0000	0000
K	Not Rated	400°	20	0.032"	400°	2	Yellow	Red	Brown	10, 20, 50, 100	0000000	0000	0000
K	Not Rated	400°	24	0.02"	400°	2	Yellow	Red	Brown	10, 20, 50, 100	0000000	0000	0000
K	Not Rated	400°	30	0.01"	400°	2	Yellow	Red	Brown	10, 20, 50, 100	00000000	0000	0000
T	Not Rated	400°	16	0.051"	400°	2	Blue	Red	Brown	10, 20, 50, 100	0000000	0000	0000
T	Not Rated	400°	20	0.032"	400°	2	Blue	Red	Brown	10, 20, 50, 100	0000000	0000	000
T	Not Rated	400°	24	0.02"	400°	2	Blue	Red	Brown	10, 20, 50, 100	0000000	000	000
T	Not Rated	400°	30	0.01"	400°	2	Blue	Red	Brown	10, 20, 50, 100	00000000	0000	0000
Fiberglass Insulation and Jacket
J	Not Rated	900°	16	0.051"	900°	2	White	Red	Brown with Black Tracer	10, 20, 50, 100	0000000	0000	0000
J	Not Rated	900°	20	0.032"	900°	2	White	Red	Brown with Black Tracer	10, 20, 50, 100	0000000	0000	0000
J	Not Rated	900°	24	0.02"	900°	2	White	Red	Brown with Black Tracer	10, 20, 50, 100	0000000	0000	0000
K	Not Rated	900°	16	0.051"	900°	2	Yellow	Red	Brown with Yellow Tracer	10, 20, 50, 100	0000000	0000	0000
K	Not Rated	900°	18	0.04"	900°	2	Yellow	Red	Brown with Yellow Tracer	10, 20, 50, 100	00000000	0000	0000
K	Not Rated	900°	20	0.032"	900°	2	Yellow	Red	Brown with Yellow Tracer	10, 20, 50, 100	0000000	0000	0000
K	Not Rated	900°	24	0.02"	900°	2	Yellow	Red	Brown with Yellow Tracer	10, 20, 50, 100	0000000	0000	0000
T	Not Rated	900°	16	0.051"	900°	2	Blue	Red	Brown with Blue Tracer	10, 20, 50, 100	0000000	0000	0000
T	Not Rated	900°	20	0.032"	900°	2	Blue	Red	Brown with Blue Tracer	10, 20, 50, 100	0000000	0000	0000
T	Not Rated	900°	24	0.02"	900°	2	Blue	Red	Brown with Blue Tracer	10, 20, 50, 100	0000000	0000	000
Polyimide Insulation and Jacket
J	0°	600°	20	0.032"	600°	2	White	Red	Brown	10, 20, 50, 100	0000000	0000	0000
K	0°	600°	20	0.032"	600°	2	Yellow	Red	Brown	10, 20, 50, 100	0000000	0000	0000
Vitreous Silica Insulation and Jacket
KK	Not Rated	1600°	16	0.051"	1600°	2	White with Yellow Tracer	White with Red Tracer	White	10, 20, 50, 100	0000000	0000	0000
KK	Not Rated	1600°	20	0.032"	1600°	2	White with Yellow Tracer	White with Red Tracer	White	10, 20, 50, 100	0000000	0000	0000
KK	Not Rated	1600°	24	0.02"	1600°	2	White	White with Red Tracer	White	10, 20, 50, 100	00000000	0000	0000
Ceramic Fiber Insulation and Jacket
KK	Not Rated	2200°	16	0.051"	2200°	2	White with Yellow Tracer	White with Red Tracer	White with Yellow Tracer	10, 20, 50, 100	0000000	0000	0000
KK	Not Rated	2200°	20	0.032"	2200°	2	White with Yellow Tracer	White with Red Tracer	White with Yellow Tracer	10, 20, 50, 100	0000000	0000	0000
KK	Not Rated	2200°	24	0.02"	2200°	2	White with Yellow Tracer	White	White with Yellow Tracer	10, 20, 50, 100	00000000	0000	0000
Stranded Wire
FEP Insulation and Jacket
J	Not Rated	400°	16	0.051"	400°	2	White	Red	Brown	10, 20, 50, 100	0000000	0000	0000
J	Not Rated	400°	20	0.032"	400°	2	White	Red	Brown	10, 20, 50, 100	0000000	0000	0000
J	Not Rated	400°	24	0.02"	400°	2	White	Red	Brown	10, 20, 50, 100	0000000	0000	0000
K	Not Rated	400°	16	0.051"	400°	2	Yellow	Red	Brown	10, 20, 50, 100	0000000	0000	0000
K	Not Rated	400°	20	0.032"	400°	2	Yellow	Red	Brown	10, 20, 50, 100	0000000	0000	0000
K	Not Rated	400°	24	0.02"	400°	2	Yellow	Red	Brown	10, 20, 50, 100	0000000	0000	0000
T	Not Rated	400°	16	0.051"	400°	2	Blue	Red	Brown	10, 20, 50, 100	0000000	0000	0000
T	Not Rated	400°	20	0.032"	400°	2	Blue	Red	Brown	10, 20, 50, 100	0000000	0000	0000
T	Not Rated	400°	24	0.02"	400°	2	Blue	Red	Brown	10, 20, 50, 100	0000000	0000	000
Fiberglass Insulation and Jacket
J	Not Rated	900°	16	0.051"	900°	2	White	Red	Brown with Black Tracer	10, 20, 50, 100	0000000	0000	0000
J	Not Rated	900°	20	0.032"	900°	2	White	Red	Brown with Black Tracer	10, 20, 50, 100	0000000	0000	000
J	Not Rated	900°	24	0.02"	900°	2	White	Red	Brown with Black Tracer	10, 20, 50, 100	0000000	0000	000
K	Not Rated	900°	16	0.051"	900°	2	Yellow	Red	Brown with Yellow Tracer	10, 20, 50, 100	0000000	0000	0000
K	Not Rated	900°	20	0.032"	900°	2	Yellow	Red	Brown with Yellow Tracer	10, 20, 50, 100	0000000	0000	0000
K	Not Rated	900°	24	0.02"	900°	2	Yellow	Red	Brown with Yellow Tracer	10, 20, 50, 100	0000000	0000	0000
T	Not Rated	900°	16	0.051"	900°	2	Blue	Red	Brown with Blue Tracer	10, 20, 50, 100	0000000	0000	0000
T	Not Rated	900°	20	0.032"	900°	2	Blue	Red	Brown with Blue Tracer	10, 20, 50, 100	0000000	0000	0000
T	Not Rated	900°	24	0.02"	900°	2	Blue	Red	Brown with Blue Tracer	10, 20, 50, 100	0000000	0000	000
Polyimide Insulation and Jacket
J	0°	600°	20	0.038"	600°	2	White	Red	Brown	10, 20, 50, 100	0000000	0000	0000
K	0°	600°	20	0.038"	600°	2	Yellow	Red	Brown	10, 20, 50, 100	0000000	0000	0000

Thermocouple Extension Wire with Connectors

Straight Cable with Flat-Pin Mini Male × Female Connector

Straight Cable with Flat-Pin Mini Male × Male Connector

Straight Cable with Round-Pin Male × Female Connector

Coiled Cable with Flat-Pin Mini Male × Female Connector

Coiled Cable with Flat-Pin Mini Male × Male Connector

Extend the reach of your thermocouple probe—plug-in connectors on both ends of this wire speed up installation.

Coiled wire stays neat and compact for easy storage. You can stretch it out to extend its reach.

			Wire		Material
Thermocouple Type	Temperature Range, °F	Lg., ft.	Gauge	Dia.	Insulation	Jacket	Max. Jacket Temperature, °F		Each
Straight Cable—Solid Wire
Flat-Pin Mini Male × Flat-Pin Mini Female Connector
J	-15° to 220°	10	24	0.17"	PVC	PVC	220°	00000000	000000
J	-15° to 220°	25	24	0.17"	PVC	PVC	220°	00000000	00000
J	-15° to 220°	50	24	0.17"	PVC	PVC	220°	00000000	00000
K	-15° to 220°	10	24	0.17"	PVC	PVC	220°	00000000	00000
K	-15° to 220°	25	24	0.17"	PVC	PVC	220°	00000000	00000
K	-15° to 220°	50	24	0.17"	PVC	PVC	220°	00000000	00000
T	-15° to 220°	10	24	0.17"	PVC	PVC	220°	00000000	00000
T	-15° to 220°	25	24	0.17"	PVC	PVC	220°	00000000	00000
T	-15° to 220°	50	24	0.17"	PVC	PVC	220°	00000000	00000
Flat-Pin Mini Male × Flat-Pin Mini Male Connector
J	-15° to 220°	10	24	0.17"	PVC	PVC	220°	0000000	00000
J	-15° to 220°	25	24	0.17"	PVC	PVC	220°	0000000	00000
K	-15° to 220°	10	24	0.17"	PVC	PVC	220°	0000000	00000
K	-15° to 220°	25	24	0.17"	PVC	PVC	220°	0000000	00000
T	-15° to 220°	10	24	0.17"	PVC	PVC	220°	0000000	00000
T	-15° to 220°	25	24	0.17"	PVC	PVC	220°	0000000	00000
Round-Pin Male × Round-Pin Female Connector
J	-15° to 220°	10	24	0.17"	PVC	PVC	220°	00000000	00000
J	-15° to 220°	25	24	0.17"	PVC	PVC	220°	00000000	00000
J	-15° to 220°	50	24	0.17"	PVC	PVC	220°	00000000	00000
K	-15° to 220°	10	24	0.17"	PVC	PVC	220°	00000000	00000
K	-15° to 220°	25	24	0.17"	PVC	PVC	220°	00000000	00000
K	-15° to 220°	50	24	0.17"	PVC	PVC	220°	00000000	00000
T	-15° to 220°	10	24	0.17"	PVC	PVC	220°	00000000	00000
T	-15° to 220°	25	24	0.17"	PVC	PVC	220°	00000000	00000
T	-15° to 220°	50	24	0.17"	PVC	PVC	220°	00000000	00000
Coiled Cable—Stranded Wire
Flat-Pin Mini Male × Flat-Pin Mini Female Connector
J	-30° to 220°	5	28	0.165"	PTFE	Polyurethane	220°	00000000	00000
K	-30° to 220°	5	28	0.165"	PTFE	Polyurethane	220°	00000000	00000
T	-30° to 220°	5	28	0.165"	PTFE	Polyurethane	220°	00000000	00000
Flat-Pin Mini Male × Flat-Pin Mini Male Connector
J	-30° to 220°	5	28	0.165"	PTFE	Polyurethane	220°	0000000	00000
K	-30° to 220°	5	28	0.165"	PTFE	Polyurethane	220°	0000000	00000
T	-30° to 220°	5	28	0.165"	PTFE	Polyurethane	220°	0000000	00000

Thermocouple Extension Wire

Unshielded Solid Wire

Unshielded Stranded Wire

Shielded Solid Wire

Designed to carry thermocouple signals over longer distances than standard thermocouple wire, this extension wire lengthens existing thermocouple connections.

Shielded wire has a layer of foil that blocks signal interference from nearby equipment and devices. It has an uninsulated ground wire that is not counted in the number of wires.

Stranded wire is flexible, so it’s pliable enough to be pulled around corners.

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

			Wire				Wire Color							Per Ft.
Thermocouple Type	Min Temp., °F	Max. Temp., °F	Gauge	Dia.	Max. Jacket Temp., °F	No. of Wires	Positive	Negative	Jacket Color	Features	Specifications Met	Lengths, ft.		1-99	100-Up
Unshielded Solid Wire
PVC Insulation and Jacket
JX	-40°	220°	20	0.032"	220°	2	White	Red	Black	__	UL Recognized Component	10, 20, 50, 100	0000000	00000	00000
JX	-40°	220°	16	0.051"	220°	2	White	Red	Black	__	UL Recognized Component	10, 20, 50, 100	0000000	0000	0000
KX	-40°	220°	20	0.032"	220°	2	Yellow	Red	Yellow	__	UL Recognized Component	10, 20, 50, 100	0000000	0000	0000
KX	-40°	220°	16	0.051"	220°	2	Yellow	Red	Yellow	__	UL Recognized Component	10, 20, 50, 100	0000000	0000	0000
TX	-40°	220°	20	0.032"	220°	2	Blue	Red	Blue	__	UL Recognized Component	10, 20, 50, 100	0000000	000	000
TX	-40°	220°	16	0.051"	220°	2	Blue	Red	Blue	__	UL Recognized Component	10, 20, 50, 100	0000000	0000	0000
Unshielded Stranded Wire
PVC Insulation and Jacket
JX	15°	220°	20	0.032"	220°	2	White	Red	Black	__	UL Recognized Component	10, 20, 50, 100	00000000	0000	0000
KX	15°	220°	20	0.032"	220°	2	Yellow	Red	Yellow	__	UL Recognized Component	10, 20, 50, 100	00000000	0000	0000
TX	15°	220°	20	0.032"	220°	2	Blue	Red	Blue	__	UL Recognized Component	10, 20, 50, 100	00000000	0000	0000
Shielded Solid Wire
PVC Insulation and Jacket
JX	Not Rated	220°	20	0.032"	220°	2	White	Red	Black	Uninsulated Ground Wire	__	10, 20, 50, 100	0000000	0000	0000
JX	Not Rated	220°	16	0.051"	220°	2	White	Red	Black	Uninsulated Ground Wire	__	10, 20, 50, 100	0000000	0000	0000
KX	Not Rated	220°	20	0.032"	220°	2	Yellow	Red	Yellow	Uninsulated Ground Wire	__	10, 20, 50, 100	0000000	0000	0000
KX	Not Rated	220°	16	0.051"	220°	2	Yellow	Red	Yellow	Uninsulated Ground Wire	__	10, 20, 50, 100	0000000	0000	0000

Armored Thermocouple Extension Wire with Connectors

Male × Female Flat-Pin Mini Connector

Male × Female Round-Pin Connector

With plug-in connectors on both ends, this wire extends the reach of your thermocouple. It’s protected by a stainless steel armor that also resists corrosion and wear. Made of thermocouple materials, it prevents signal loss.

Choose a wire that matches your thermocouple type. You should also make sure the equipment you're connecting it to is compatible with the same thermocouple type.

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

			Wire		Material
Thermocouple Type	Temperature Range, °F	Lg., ft.	Gauge	Dia.	Insulation	Jacket	Max. Insulation Temperature, °F		Each
Stranded Wire
Male Flat-Pin Mini Thermocouple Connector × Female Flat-Pin Mini Thermocouple Connector
J	32° to 350°	5	24	0.02"	PTFE	Stainless Steel	350°	0000000	000000
J	32° to 350°	10	24	0.02"	PTFE	Stainless Steel	350°	0000000	00000
J	32° to 350°	25	24	0.02"	PTFE	Stainless Steel	350°	0000000	000000
K	32° to 350°	5	24	0.02"	PTFE	Stainless Steel	350°	0000000	00000
K	32° to 350°	10	24	0.02"	PTFE	Stainless Steel	350°	0000000	00000
K	32° to 350°	25	24	0.02"	PTFE	Stainless Steel	350°	0000000	000000
T	32° to 350°	5	24	0.02"	PTFE	Stainless Steel	350°	0000000	00000
T	32° to 350°	10	24	0.02"	PTFE	Stainless Steel	350°	0000000	00000
Male Round-Pin Thermocouple Connector × Female Round-Pin Thermocouple Connector
J	32° to 350°	5	24	0.02"	PTFE	Stainless Steel	350°	0000000	00000
J	32° to 350°	10	24	0.02"	PTFE	Stainless Steel	350°	0000000	00000
J	32° to 350°	25	24	0.02"	PTFE	Stainless Steel	350°	0000000	000000
K	32° to 350°	5	24	0.02"	PTFE	Stainless Steel	350°	0000000	00000
K	32° to 350°	10	24	0.02"	PTFE	Stainless Steel	350°	0000000	00000
K	32° to 350°	25	24	0.02"	PTFE	Stainless Steel	350°	0000000	000000
T	32° to 350°	5	24	0.02"	PTFE	Stainless Steel	350°	0000000	00000
T	32° to 350°	10	24	0.02"	PTFE	Stainless Steel	350°	0000000	00000