Thermocouple Assemblies | McMaster-Carr

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	Thermocouple Type Thermocouple Type

	Connection Type Connection Type


Screw Terminal	Wire Leads

	Probe Length Probe Length

	For Use With For Use With

Gases

Liquids

	Material Material

	For Probe OD For Probe OD

	Probe Diameter Probe Diameter

3/16"

1/4"

1/2"

	Maximum Temperature Maximum Temperature

	Thread Type Thread Type

	Pipe Size Pipe Size

	Probe Material Probe Material

Stainless Steel

Ceramic

	Sensor Type Sensor Type

Grounded

Ungrounded

	Minimum Temperature Minimum Temperature

-330° F

-325° F

32° F

	Overall Length Overall Length

	Response Time Response Time

107 sec.

Not Rated

	Head Material Head Material

Iron

Aluminum

	Maximum Wire Gauge Maximum Wire Gauge

	Thermowell Material Thermowell Material

304 Stainless Steel

316 Stainless Steel

	Probe Connection Gender Probe Connection Gender

Male

Female

	Cuttable Length Cuttable Length

20"

44"

	Specifications Met Specifications Met

ATEX Certified

CE Marked

CSA

IECEx Certified

NEC/CEC Zone Rated

	For Thermocouple Wire Type For Thermocouple Wire Type

	Thread Size Thread Size

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149 Products

About Selecting Temperature Sensors

The included thermowell protects the probe from vibration, corrosion, and shock in tanks and pipelines.

	Probe					Thermowell Connection			Conduit Connection
Temperature Range, ° F	Lg.	Dia.	Accuracy	Connection Type	Sensor Type	Pipe Size	Thread Type	Gender	Pipe Size	Thread Type	Gender	Probe Material	Max. Wire Gauge	Overall Lg.		Each
304 Stainless Steel Thermowell
Type J
32° to 1400°	6"	1/2"	±0.75%	Screw Terminal	Ungrounded	3/4	NPT	Male	3/4	NPT	Female	Ceramic	20	14"	0000000	0000000
32° to 1400°	9"	1/2"	±0.75%	Screw Terminal	Ungrounded	3/4	NPT	Male	3/4	NPT	Female	Ceramic	20	17"	0000000	000000
32° to 1400°	12"	1/2"	±0.75%	Screw Terminal	Ungrounded	3/4	NPT	Male	3/4	NPT	Female	Ceramic	20	20"	0000000	000000
Type K
32° to 1600°	6"	1/2"	±0.75%	Screw Terminal	Ungrounded	3/4	NPT	Male	3/4	NPT	Female	Ceramic	20	14"	0000000	000000
32° to 1600°	9"	1/2"	±0.75%	Screw Terminal	Ungrounded	3/4	NPT	Male	3/4	NPT	Female	Ceramic	20	17"	0000000	000000
32° to 1600°	12"	1/2"	±0.75%	Screw Terminal	Ungrounded	3/4	NPT	Male	3/4	NPT	Female	Ceramic	20	20"	0000000	000000
Type T
-325° to 700°	6"	1/2"	±0.75%	Screw Terminal	Ungrounded	3/4	NPT	Male	3/4	NPT	Female	Ceramic	20	14"	0000000	000000
-325° to 700°	9"	1/2"	±0.75%	Screw Terminal	Ungrounded	3/4	NPT	Male	3/4	NPT	Female	Ceramic	20	17"	0000000	000000
-325° to 700°	12"	1/2"	±0.75%	Screw Terminal	Ungrounded	3/4	NPT	Male	3/4	NPT	Female	Ceramic	20	20"	0000000	000000
316 Stainless Steel Thermowell
Type J
32° to 1400°	5 1/2"	1/2"	±0.75%	Screw Terminal	Grounded	3/4	NPT	Male	3/4	NPT	Female	Ceramic	14	13 1/8"	00000000	000000
32° to 1400°	8 1/2"	1/2"	±0.75%	Screw Terminal	Grounded	3/4	NPT	Male	3/4	NPT	Female	Ceramic	14	16 1/8"	00000000	000000
32° to 1400°	11 1/2"	1/2"	±0.75%	Screw Terminal	Grounded	3/4	NPT	Male	3/4	NPT	Female	Ceramic	14	19 1/8"	00000000	000000
Type K
32° to 1600°	5 1/2"	1/2"	±0.75%	Screw Terminal	Grounded	3/4	NPT	Male	3/4	NPT	Female	Ceramic	14	13 1/8"	00000000	000000
32° to 1600°	8 1/2"	1/2"	±0.75%	Screw Terminal	Grounded	3/4	NPT	Male	3/4	NPT	Female	Ceramic	14	16 1/8"	00000000	000000
32° to 1600°	11 1/2"	1/2"	±0.75%	Screw Terminal	Grounded	3/4	NPT	Male	3/4	NPT	Female	Ceramic	14	19 1/8"	00000000	000000
Type T
-325° to 700°	5 1/2"	1/2"	±0.75%	Screw Terminal	Grounded	3/4	NPT	Male	3/4	NPT	Female	Ceramic	14	13 1/8"	00000000	000000
-325° to 700°	8 1/2"	1/2"	±0.75%	Screw Terminal	Grounded	3/4	NPT	Male	3/4	NPT	Female	Ceramic	14	16 1/8"	00000000	000000
-325° to 700°	11 1/2"	1/2"	±0.75%	Screw Terminal	Grounded	3/4	NPT	Male	3/4	NPT	Female	Ceramic	14	19 1/8"	00000000	000000

Heavy Duty Threaded Thermocouple
Probes for Liquids and Gases

To withstand harsh environments, a protective head seals out dust and moisture and thick probe walls reduce wear on the sensing element.

	Probe					Probe Connection			Conduit Connection
Temperature Range, ° F	Lg.	Dia.	Accuracy	Connection Type	Sensor Type	Pipe Size	Thread Type	Gender	Pipe Size	Thread Type	Gender	Max. Wire Gauge	Specifications Met	Overall Lg.		Each
316 Stainless Steel Probe
Type J
32° to 1400°	6"	3/16"	±0.75%	Screw Terminal	Grounded	1/2	NPT	Male	3/4	NPT	Female	20	__	11"	0000000	0000000
32° to 1400°	6"	1/4"	±0.75%	Screw Terminal	Grounded	1/2	NPT	Male	3/4	NPT	Female	20	__	11"	0000000	000000
32° to 1400°	12"	3/16"	±0.75%	Screw Terminal	Grounded	1/2	NPT	Male	3/4	NPT	Female	20	__	17"	00000000	000000
32° to 1400°	12"	1/4"	±0.75%	Screw Terminal	Grounded	1/2	NPT	Male	3/4	NPT	Female	20	__	17"	00000000	000000
Type K
32° to 1650°	6"	3/16"	±0.75%	Screw Terminal	Grounded	1/2	NPT	Male	3/4	NPT	Female	20	__	11"	0000000	000000
32° to 1650°	6"	1/4"	±0.75%	Screw Terminal	Grounded	1/2	NPT	Male	3/4	NPT	Female	20	__	11"	0000000	000000
32° to 1650°	12"	3/16"	±0.75%	Screw Terminal	Grounded	1/2	NPT	Male	3/4	NPT	Female	20	__	17"	00000000	000000
32° to 1650°	12"	1/4"	±0.75%	Screw Terminal	Grounded	1/2	NPT	Male	3/4	NPT	Female	20	__	17"	00000000	000000
Type T
-325° to 700°	6"	3/16"	±0.75%	Screw Terminal	Grounded	1/2	NPT	Male	3/4	NPT	Female	20	__	11"	0000000	000000
-325° to 700°	6"	1/4"	±0.75%	Screw Terminal	Grounded	1/2	NPT	Male	3/4	NPT	Female	20	__	11"	0000000	000000
-325° to 700°	12"	3/16"	±0.75%	Screw Terminal	Grounded	1/2	NPT	Male	3/4	NPT	Female	20	__	17"	00000000	000000
-325° to 700°	12"	1/4"	±0.75%	Screw Terminal	Grounded	1/2	NPT	Male	3/4	NPT	Female	20	__	17"	00000000	000000
446 Stainless Steel Probe
Type J
32° to 1400°	10"	1/2"	±0.75%	Screw Terminal	Grounded	1/2	NPT	Male	3/4	NPT	Female	14	FM Approved	17 1/4"	0000000	000000
32° to 1400°	16"	1/2"	±0.75%	Screw Terminal	Grounded	1/2	NPT	Male	3/4	NPT	Female	14	FM Approved	23 1/4"	0000000	000000
32° to 1400°	22"	1/2"	±0.75%	Screw Terminal	Grounded	1/2	NPT	Male	3/4	NPT	Female	14	FM Approved	29 1/4"	0000000	000000
Type K
32° to 2000°	10"	1/2"	±0.75%	Screw Terminal	Grounded	1/2	NPT	Male	3/4	NPT	Female	14	FM Approved	17 1/4"	0000000	000000
32° to 2000°	16"	1/2"	±0.75%	Screw Terminal	Grounded	1/2	NPT	Male	3/4	NPT	Female	14	FM Approved	23 1/4"	0000000	000000
32° to 2000°	22"	1/2"	±0.75%	Screw Terminal	Grounded	1/2	NPT	Male	3/4	NPT	Female	14	FM Approved	29 1/4"	0000000	000000

Cut-to-Length Thermocouple Probes for Liquids and Gases

Trim these probes to the exact length you need with a pipe cutter.

Note: When installing probes with wire leads, the red wire is negative.

	Probe								Wire
Temperature Range, ° F	Lg.	Dia.	Cuttable Lg.	Accuracy	Response Time, sec.	Connection Type	Sensor Type	Sensing Tip Lg.	Lead Lg.	Gauge		Each
304 Stainless Steel Probe
Type J
32° to 400°	24"	1/4"	20"	±0.12%	107	Wire Leads	Grounded	3"	6"	20	00000000	000000
32° to 400°	48"	1/4"	44"	±0.12%	107	Wire Leads	Grounded	3"	6"	20	00000000	000000
32° to 900°	24"	1/4"	20"	±0.12%	107	Wire Leads	Grounded	3"	6"	20	00000000	00000
32° to 900°	48"	1/4"	44"	±0.12%	107	Wire Leads	Grounded	3"	6"	20	00000000	000000
32° to 1300°	24"	1/4"	20"	±0.12%	107	Wire Leads	Grounded	3"	6"	20	00000000	00000
32° to 1300°	48"	1/4"	44"	±0.12%	107	Wire Leads	Grounded	3"	6"	20	00000000	000000
Type K
32° to 400°	24"	1/4"	20"	±0.12%	107	Wire Leads	Grounded	3"	6"	20	00000000	00000
32° to 400°	48"	1/4"	44"	±0.12%	107	Wire Leads	Grounded	3"	6"	20	00000000	000000
32° to 900°	24"	1/4"	20"	±0.12%	107	Wire Leads	Grounded	3"	6"	20	00000000	00000
32° to 900°	48"	1/4"	44"	±0.12%	107	Wire Leads	Grounded	3"	6"	20	00000000	000000
32° to 1300°	24"	1/4"	20"	±0.12%	107	Wire Leads	Grounded	3"	6"	20	00000000	00000
32° to 1300°	48"	1/4"	44"	±0.12%	107	Wire Leads	Grounded	3"	6"	20	00000000	000000
Type T
-330° to 400°	24"	1/4"	20"	±0.12%	107	Wire Leads	Grounded	3"	6"	20	00000000	00000
-330° to 400°	48"	1/4"	44"	±0.12%	107	Wire Leads	Grounded	3"	6"	20	00000000	000000

Terminal Blocks for Thermocouple Wire

Connect thermocouple probes to extension wire or instrumentation.

For Thermocouple Wire Type	Wire Connection Type	For Max. Wire Gauge	Max. Temperature, ° F		Each
J, JX, KX, T, KK, TX, K	Screw Terminals	14	1000°	00000000	000000

Adjustable Thermocouple and RTD Compression Fittings

Alter probe immersion depth with these fittings that can be repositioned along the probe sheath.

Brass fittings resist corrosion in damp environments, but will tarnish if exposed to salt or chemicals in water or in the air.

Stainless steel fittings resist corrosion from wet environments, salt water, and harsh chemicals.

Brass Fittings
For Probe OD	Pipe Size	Thread Size	Gender		Each
NPT Threaded
1/16"	1/16	__	Male	00000000	000000
1/16"	1/4	__	Male	00000000	00000
1/16"	1/8	__	Male	0000000	00000
1/16"	3/8	__	Male	00000000	00000
1/8"	1/16	__	Male	00000000	0000
1/8"	1/4	__	Male	00000000	0000
1/8"	1/8	__	Male	00000000	0000
1/8"	3/8	__	Male	0000000	00000
3/16"	1/2	__	Male	00000000	00000
3/16"	1/4	__	Male	00000000	0000
3/16"	1/8	__	Male	00000000	0000
3/16"	3/8	__	Male	00000000	00000
1/4"	1/2	__	Male	00000000	00000
1/4"	1/4	__	Male	00000000	0000
1/4"	1/8	__	Male	00000000	0000
1/4"	3/8	__	Male	00000000	00000
5/16"	1/2	__	Male	00000000	00000
5/16"	3/8	__	Male	00000000	00000
3/8"	1/2	__	Male	00000000	00000
3/8"	1/4	__	Male	00000000	0000
3/8"	3/8	__	Male	00000000	00000
1/2"	1/2	__	Male	00000000	00000
3mm	1/8	__	Male	00000000	00000
4mm	1/4	__	Male	00000000	00000
4mm	1/8	__	Male	00000000	00000
6mm	1/2	__	Male	00000000	00000
6mm	3/8	__	Male	00000000	00000
8mm	1/4	__	Male	00000000	00000
10mm	1/2	__	Male	00000000	00000
10mm	1/4	__	Male	00000000	00000
12mm	1/2	__	Male	00000000	00000
12mm	1/4	__	Male	0000000	00000
12mm	3/4	__	Male	00000000	00000
12mm	3/8	__	Male	00000000	00000
Stainless Steel Fittings
NPT Threaded
1/16"	1/16	__	Male	00000000	00000
1/16"	1/4	__	Male	00000000	00000
1/16"	1/8	__	Male	0000000	00000
1/16"	3/8	__	Male	00000000	00000
1/8"	1/16	__	Male	00000000	00000
1/8"	1/4	__	Male	00000000	00000
1/8"	1/8	__	Male	0000000	00000
1/8"	3/8	__	Male	00000000	00000
3/16"	1/2	__	Male	00000000	00000
3/16"	1/4	__	Male	00000000	00000
3/16"	1/8	__	Male	0000000	00000
3/16"	3/8	__	Male	00000000	00000
1/4"	1/2	__	Male	00000000	00000
1/4"	1/4	__	Male	0000000	00000
1/4"	1/8	__	Male	00000000	00000
1/4"	3/8	__	Male	0000000	00000
5/16"	1/2	__	Male	00000000	00000
5/16"	1/4	__	Male	0000000	00000
5/16"	3/8	__	Male	00000000	00000
3/8"	1/2	__	Male	00000000	00000
3/8"	1/4	__	Male	0000000	00000
3/8"	3/8	__	Male	00000000	00000
1/2"	1/2	__	Male	00000000	00000
3mm	1/8	__	Male	0000000	00000
4mm	1/4	__	Male	00000000	00000
4mm	1/8	__	Male	00000000	00000
6mm	1/2	__	Male	00000000	00000
6mm	3/8	__	Male	00000000	00000
8mm	1/4	__	Male	00000000	00000
10mm	1/2	__	Male	00000000	00000
10mm	1/4	__	Male	00000000	00000
12mm	1/2	__	Male	0000000	00000
12mm	1/4	__	Male	00000000	00000
12mm	3/4	__	Male	00000000	00000
12mm	3/8	__	Male	00000000	00000
BSPP Threaded
1/8"	1/8	__	Male	00000000	00000
1/4"	1/4	__	Male	00000000	00000
1/4"	1/8	__	Male	00000000	00000
3/8"	1/2	__	Male	00000000	00000
3/8"	1/4	__	Male	00000000	00000
3/8"	3/8	__	Male	00000000	00000
1/2"	1/2	__	Male	0000000	00000
BSPT Threaded
1/8"	1/8	__	Male	00000000	00000
1/4"	1/4	__	Male	00000000	00000
1/4"	1/8	__	Male	00000000	00000
3/8"	1/2	__	Male	00000000	00000
3/8"	1/4	__	Male	00000000	00000
3/8"	3/8	__	Male	00000000	00000
1/2"	1/2	__	Male	00000000	00000
UNF Threaded
1/8"	__	5/16"-24	Male	00000000	00000
1/4"	__	7/16"-20	Male	00000000	00000
1/4"	__	9/16"-18	Male	0000000	00000
3/8"	__	3/4"-16	Male	00000000	00000
1/2"	__	1 1/16"-12	Male	00000000	00000
1/2"	__	3/4"-16	Male	00000000	00000

Thermocouple and RTD Fittings

Adapt unthreaded thermocouple and RTD connections for use with threaded tanks and connection heads.

Pipe Size	O-Ring Material	Material		Each
1/2 NPT Male × 1/2 NPT Male	__	Stainless Steel	00000000	000000
1/2 NPT Male × 1/2 NPT Male	Fluoroelastomer	Stainless Steel	00000000	00000

Thermocouple and RTD Connection Heads

With Screw-On Cap

With Hinged Cap

A removable cap seals out dust and moisture and provides easy access to sensor connections.

Hazardous location connection heads are rated for use in Class I, Divisions 1 and 2, Groups A, B, C, and D; Class II, Divisions 1 and 2, Groups E, F, and G; and Class III, Divisions 1 and 2 environments with flammable gases, combustible dust, and combustible fibers.

Probe Connection			Conduit Connection
Pipe Size	Thread Type	Gender	Pipe Size	Thread Type	Gender	Includes	Environment	Environmental Rating		Each
Aluminum
1/2	NPT	Female	3/4	NPT	Female	Screw-On Cap with Retaining Chain	__	__	00000000	000000
1/2	NPT	Female	3/4	NPT	Female	Screw-On Cap with Retaining Chain	Hazardous Location	NEC Class I Divisions 1, 2 Groups A, B, C, D NEC Class II Divisions 1, 2 Groups E, F, G NEC Class III Divisions 1, 2 NEMA 4X	00000000	00000
Cast Iron
1/2	NPT	Female	3/4	NPT	Female	Screw-On Cap with Retaining Chain	__	__	00000000	00000
Plastic
1/2	NPT	Female	3/4	NPT	Female	Hinged Cap	__	__	00000000	00000
1/2	NPT	Female	3/4	NPT	Female	Screw-On Cap with Retaining Chain	__	__	00000000	00000
Stainless Steel
1/2	NPT	Female	3/4	NPT	Female	Screw-On Cap with Retaining Chain	__	__	00000000	000000
1/2	NPT	Female	3/4	NPT	Female	Screw-On Cap with Retaining Chain	Hazardous Location	NEC Class I Divisions 1, 2 Groups A, B, C, D NEC Class II Divisions 1, 2 Groups E, F, G NEC Class III Divisions 1, 2 NEC Zone 1 Groups IIC, IIB, IIA NEC Zone 21 Groups IIIC, IIIB, IIIA IEC Zone 1 Groups IIC, IIB, IIA IEC Zone 21 Groups IIIC, IIIB, IIIA IP66	00000000	000000

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