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Retractable Metal Bolt Thermocouple
Retractable Melt Bolt Thermocouple
Retractable Metal Bolt Thermocouple
Retractable Melt Bolt Thermocouple

Retractable Melt Bolt Thermocouple

Marathon Heater offers Retractable Melt Bolt Thermocouples. Mineral Insulated Thermocouples are manufactured at Backer Marathon to address your higher temperature requirements. Since the calibration wire is encased within a metal sheath packed with magnesium oxide the thermocouples can withstand higher temperatures and depending on the application will last longer since they are more durable. One excellent feature of Mineral Insulated Thermocouples is faster response time. We stock hundreds of different models and offer quick turnaround, usually 48 hours or less, on custom designed and manufactured units. 

Retractable Melt Bolt Thermocouple Standard Specifications

​Retractable Melt Bolts offer an adjustable immersion depth during full operation at maximum flow rates and pressures. Thermocouple junction can be centered in hot melt stream. Maximum temperature rating of 900°F. 

Standard Features

  • Available in 3", 5" or 7" lengths
  • 1/8" diameter MGO tip
  • 1/2-20 UNF thread
  • Grounded, exposed or ungrounded junctions available
  • Type J or K calibration
  • High pressure and high temperature rated
  • RTD Style available
  • Immersion available from 1/8" to 1"
  • Polarized plug or jack
  • Replacement elements available

Stock Parts


Part No. Lead Length Available Qty Price
RTD-4222-03 0.0 inches 1 Sign In for Pricing
RTD-4222-05 0.0 inches 1 Sign In for Pricing
RTD-4222-07 0.0 inches 1 Sign In for Pricing
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