Alloy manufactures and engineers a variety of thermowells including: standard threaded thermowells for 1/4"; heavy-duty threaded thermowells for 1/4"; standard threaded thermowells for 3/8"; heavy-duty threaded thermowells for 3/8"; socket-weld, design thermowells for 1/4" and 3/8"; heavy-duty, socket-weld design thermowells for 1/4" and 3/8"; flanged thermowells for 1/4" and 3/8"; tapered flanged thermowells for 1/4" and 3/8"; limited space thermowells for 1/4" and general purpose test for 3/8"; standard threaded for industrial glass thermowells; van stone thermowells 1/4" and 3/8"; 1-1/2" diameter weld-in thermowells; sanitary type thermowells; tantalum jackets and teflong thermowells. The company also manurfactures Navy thermowells and metric thermowells.

Omega manufactures a line of thermowells that includes heavy-duty threaded, socket-weld design, flanged, van stone, and standard threaded thermowells for 1/4 inch and 3/8 inch diameter elements. The company also produces sanitary thermowells; commodity thermowells; standard threaded thermowells, for metric elements and industrial glass thermometers; and PFA-coated and solid PFA thermowells.

Palmer Wahl manufactures thermowells with a variety of connections, bore sizes, stem lengths and materials. The company's line of thermowells includes: threaded-regular, threaded-lagging, welding, test, van stone, and flanged thermowells.

C-Temp manufactures standard threaded thermowells, for 1/4" and 3/8" diameter elements and glass thermometers; heavy-duty threaded thermowells, for 1/4" and 3/8" diameter elements; limited space thermowells, for 1/4" diameter elements; general purpose test thermowells, for 3/8" diameter elements; socket-weld thermowells, for 1/4" and 3/8" diameter elements; bar stock, weld-in thermowells; flanged thermowells, for 1/4" and 3/8" diameter elements; and van stone thermowells, for 1/4" and 3/8" diameter elements.

Tantaline supplies Alloy brand corrosion resistant thermowells, and integrates the thermowell's with its' tantulum vapor technology. The thermowells are used for valves, fittings, instrumentation and custom products in hot acid environments.

Pyromation manufactures thermowells that are available as seperate components or as part of a complete temperature sensor assembly. The company produces a variety of thermowell types including: threaded, van stone, socket-weld, weld-in, flanged, connected and limited space.

Sivco Inc. is a high metal fabrication company that manufactures high temperature, erosion-resistant; removable and weld-in thermowells designed specifically for ethylene pyrolsis furnaces. Each thermowell can be easily removed, and requires no cutting of welds or any reweld for installation.

Temperature Measurement Systems manufactures seven types of thermowells including: threaded, flanged, van stone, socket-weld, weld-in, coated and specialty. The copmany also produces test wells, samples probes, metal protection tubes, and ceramic protection tubes.

MTI Industrial Sensors manufactures solid, barstock-type thermowells for the petrochemical, chemical, refining, power and other process industries. The company's thermowell types include threaded, flanged, weld-in, socket, and van stone. MTI also produces metal protection and ceramic tubes, with pipe sizes ranging from 1/4" to 2".