A pioneer and global leader in manufacturing thermowells

We ensure only the highest quality and precision in every thermowell we manufacture.

Whether they are custom-made for highly specialized measurements or they are standard configuration, each and every thermowell is built to meet or exceed accepted standards.

Mac-Weld offers a wide variety of various process connections and styles

Connection Types

  • Flanged
  • Threaded
  • Socket Weld
  • Vanstone
  • Weld-In
  • Tri-Clamp
  • Limited Space

Shank Styles

  • Stepped Thermowells
  • Straight Thermowells
  • Tapered Thermowells
  • Helical Thermowells


Precision | Quality | On-time Delivery

Our thermowells are designed and manufactured 100% in house, and are made to accept standard and custom made thermometers, thermocouples, bulbs and RTD’s. Mac-Weld flange thermowells are also available in a large variety of sizes and configurations that include, but are not limited to, raised face, flat face, and ring type joint.

  • Mac-Weld thermowells accept standard or custom-made thermometers, thermocouples, bulbs and RTD’s
  • All are manufactured in house, quality checked and tested to code before being shipped
  • Mac-Weld custom software, V-MAC, utilized for thermowell wake calculations
  • Large variety of standard and exotic materials available
  • CRN approved thermowells
  • Various NDT options
  • NACE compliant
  • Sanitary (Tri-Clamps) Thermowells available, 8-12 Micro inch R/A finish

Over 40 years experience manufacturing thermowells

Our Products

As one of the largest thermowell and instrument hardware manufacturers in North America, we have a wide selection of products available to help our clients with all their projects. See below for a list of available products and options. If you don’t see what you’re looking for? Not only do we offer what you see here, but we also have a large variety of custom products and services.

Call our office today at 1-877-622-9353 for specialty components, and let us help you get your project back on track.