A wide range of thermocouple types are carried and sold by Precision Measurements. Among their products are magnesium oxide insulation, metal-sheathed thermocouples, as well as bayonet thermocouples in flex hose type and spring type. The spring type is more flexible and provides more tension than the flex hose type. Fixed length bayonet type thermocouples are also available.

C-Temp International offers mineral-insulated, plastics industry, and cut-to-length thermocouples. Mineral-insulated parts are manufactured from 0.010" to 0.5" diameter, with a variety of sheath materials such as 304SS, 310SS, 316SS, Hastelloy X, Iconel 600, Iconel 601, Iconel 702, molybdenum, and tantalum.

Watlow carries an array of thermocouples. General application styles include adjustable spring type thermocouples that fit a large range of hole depths and bend to any angle, and armor style thermocouples with stainless steel hoses that offer additional lead protection in demanding applications. Mineral-insulated thermocouples come in the basic cut and stripped style, wafer head Style AS, and thermowell-compatible Style AT.

Cleveland Electric Laboratories has been producing thermocouples and other sensing solutions since 1920. Their collection of industrial thermocouples includes mineral-insulated thermocouples (MgO) for use in process temperatures up to 2,400 degrees Fahrenheit, base metal thermocouple elements and assemblies that provide a variety of accuracy and response speed ratings, and plastics industry thermocouples in bayonet, variable depth, and melt bolt styles. Thermocouple protection tubes are also available in metal, ceramic (e.g., Mullite, Alumina, silicon carbine, etc.), cast iron, tercod pyrometer, and silicon carbide, for protection from corrosion, contamination, extreme temperatures, and shock.

Ari Industries offers a wide selection of thermocouples. Their standard/base metal thermocouples come with high purity MgO insulation to provide EMF stability and to minimize drift problems. Multi-level thermocouples are manufactured small enough to replace single-point thermocouples and large enough to replace thermowells.

Nordic Sensors Industrial specializes in thermocouples and other temperature measurement products like RTDs, thermowells, wires, hardware, controllers, and accessories. Thermocouples come in one of three categories. General purpose models are offered in adjustable bayonet, fixed bayonet, 45- and 90-degree bend, nozzle bolt, ring terminal, shim stock, and many other styles. Thermocouples for industrial processes include the hot runner, melt bolt (e.g. rigid, fixed, adjustable), mineral insulated, and 45- and 90-degree bend styles, among others. Heavy duty and special application thermocouples and related products include stepped or straight threaded thermowells, tapered threaded thermowells, nipple-union-nipple thermowells, bare element thermocouples, and noble metal thermocouples.

Convectronics designs an array of thermocouple types to meet almost any application need. Bare wire thermocouples are available in 6 standard configurations. Fixed and adjustable bayonet thermocouples are offered in standard J, K, T, and E base metals. Other types include nozzle, bolt style, metal sheath/MI, paddle, lug and washer, bearing, ribbon, sabre, refractory metal/ceramic, and noble metal thermocouples.

Furnace Parts manufactures MgO, base metal, and high temperature thermocouples, in addition to a variety of related accessories. Available in types E, J, K, N, and T, the MgO metal-sheathed units come in standard diameters of 0.063", 0.125", 0.188", 0.25", and 0.375" with several connection head and mounting fitting choices. Base metal thermocouples are offered in a variety of wire sizes and configurations, as well as with customizable lengths, insulators, heads, plugs, jacks, blocks, and flanges. Type R, S, B, and C high temperature thermocouples are also made by Furnace Parts; they come with a choice of ceramic, Inconel, Hastelloy, and Molybdenum sheaths. These three types of thermocouples can be applied to a wide range of industries, including steel and specialty metal fabrication, oil and gas, heat treating and thermal process, and aerospace.

Durex Industries supplies a wide selection of industrial process thermocouples to meet demanding process applications like steel processing, turbine and diesel engine temperature measurement, and chemical processing, as well as for commercial applications like food service, packaging, and semiconductor packaging. Platinum thermocouples, most commonly ANSI types R, S, and B, are used for high temperature applications, while mineral-insulated thermocouples can be made to all standard ANSI calibrations, with sheath diameters from 0.02" to 0.5" and temperature tolerance up to 2,400 degrees Fahrenheit. Miniature thermocouples are also available in addition to multi-point thermocouples for pipelines, process towers, boilers, and vessels where multi-point monitoring is important.

Tempco manufactures many styles of industrial thermocouple assemblies for a wide range of industries, from petrochemical to textile applications. They also offer general purpose thermocouple elements in ANSI types J and K, with either a twisted and welded or butt welded junction, available in 8, 13, and 20 gauge. Finally, the company sells noble metal thermocouples in types R and S; all these elements have a butt welded junction and are available in 20, 24, and 30 gauge.

Thermal Devices offers multiple thermocouple designs for various industries. Plastics industry thermocouples come in a variety of braided or armored leads, from 48" to 96", while variable depth, armor-style thermocouples come in type J standard, lengths from 48" to 144", and stainless steel armor leads standard. Surface mount thermocouples are offered in type J and ring lug style, as well as in 72" and 120" sizes. Another type is the MgO thermocouple for temperatures to 2,200 degrees Fahrenheit, and for even hotter temperatures, an ultra-high temperature thermocouple made from platinum.

Thermocouple Technology (TTEC) provides TECPAK MgO thermocouples, power industry thermocouples, process industry thermocouples, and more. The TECPAK products come in 0.02" to 0.626" diameters, and sheath materials like 304, 310, and 316 stainless steels and Iconel 600. Power industry thermocouples are meant for demanding applications that might be found in power plants, with designs suited to boiler tube, bearing temperature, turbine test, gas sampling multipoint, vibration resistant, and other uses. Another thermocouple sold by TTEC is for industrial and high temperature applications; these units utilize ceramic protection tubes with noble metal elements for optimum performance at temperatures ranging from 2,000 to 3,100 degrees Fahrenheit.

Therm-X carries a range of thermocouples such as the KF flange vacuum thermocouple, TC exposed junction beaded wire thermocouple, and monitored wafer thermocouple. The KF is mineral-insulated, and its flange allows sensors to be fed into a vacuum chamber, while the TC provides N.I.S.T. traceability and wire with special limits of error. The MW is ideal for measuring balance of temperature throughout a wafer, and uses 36 gauge wire for efficient response times. In addition to these sensor types, other models include tube and wire, Teflon-covered, foil cement, washer, transition, and self-adhesive thermocouples.

Three main types of thermocouples are offered by National Plastic Heater Sensor & Control. Plastics industry products include adjustable depth bayonet thermocouples, fixed bayonet thermocouples that are straight or bent 45 or 90 degrees, and compression fitting thermocouples that are straight or bent 45 or 90 degrees. Next, melt bolt thermocouples feature an assortment of options, from standard plug or standard jack, to Flex Armor and Bx connector. Finally, industrial process thermocouples come mineral-insulated standard, with choice of 1" stripped end, plug, process head,or open terminal disk, as well as straight, 45-degree, or 90-degree probe with insulated leadwire.

Manufacturing temperature sensors for over 45 years, Thermo-Couple Products (TCP) offers several thermocouple versions. One is the 5500 Series pencil thermocouple that is ideal for temperatures under 900 degrees Fahrenheit, used commonly for food applications. Another is the 5520 compression-type thermocouple for injection molding applications, as well as Models 5523, 5524, and 5525 spring-type injection molding thermocouples. TCP also produces mineral insulated, engine, and high temperature thermocouples, and the tube-temp thermocouple for excellent accuracy in fired heater and industrial boiler tubes.

Thermometrics custom-manufactures thermocouple sensors in an array of configurations and types. Configurations include flex armor, bayonet, spring load, fixed fitting, weld pad, and sanitary, while types T, J, E, K, N, R, S, B, and W5 are supported. Variable elements include temperature range, accuracy, wiring configuration, sheath material, sheath diameter, sheath length, wire material, and lead length.

TIP Temperature Products sells 46 thermocouples and related accessories. Wire thermocouples provide low-cost temperature sensing, while Type T fast response thermocouples offer an accuracy of +/-0.5 degrees Celsius and are ideal for low temperature applications. Multipoint units are also in-stock and feature 3 to 10 sensing points, J, K, T, and E calbirations, and 0.0625" to 0.25" diameters. Other models include washer, hollow-tube, lead-wire, rigid compression, spring adjustable bayonet, and spade thermocouples, among many other choices.

Heat and Sensor Technology provides a variety of MgO insulated thermocouples, including leadwire, standard connector, miniature connector, snap-cover connection head, and screw-cover connection head styles. They also make plastics and packaging industry thermocouples such as the spring adjustable depth, flex-armour adjustable depth, fixed bayonet, rigid tube, spade, washer/lug, melt bolt (fiberglass or MgO), and pipe clamp styles. Lastly, industrial thermocouples include oil seal and sanitary models. Each of the three categories can be manufactured standard or custom.

MTI Industrial Sensors' general purpose MgO thermocouples are available in sheath sizes 0.01" to 0.5" in materials such as 304, 310, and 316 stainless steel, Iconel 600, platinum, copper, and titanium; single, dual, triplex, and multipoint designs are available. Ceramic beaded elements are offered in base metals J, K, T, and E, as well as noble metals R, S, and B. In addition, the company produces special purpose thermocouples to meet 3A requirements, food industry standards, and other stringent applications.

Pyromation thermocouples are made for a wide range of applications, be they industrial, general purpose, or hazardous. For example, the FD08 penetration-style thermocouple is used to monitor the internal temperatures of meat, fish, poultry, dough, and other foods; made from full hard drawn 304SS, the materials are FDA compliant for use in sanitary applications.  Another option, the industrial ID01 straight base metal thermocouple, is provided in many styles, from bare to duplex-insulated element, to insulated junction, twist weld, or tig weld. Within the full line of Pyromation thermocouples, temperature measurement is possible between -200 and +2,316 degrees Celsius.