Idaho Laboratories Corporation > Mineral Insulated Cable

Our most common Mineral Insulated Cable design for thermocouples. Further designs can be accessed at the links below.


Standard Design
Diam. Wall Tolerance
Wire Diameter

2-wire 4-wire 6-wire* 8-wire*
.500" .064" +/-.003" .098" .080" .051" .040"
.375" .048" +/-.003" .074" .060" .038" .030"
.313" .040" +.002" / -.003" .061" .050" .032" .025"
.250" .032" +/-.002" .049" .040" .026" .020"
.188" .024" +.001" / -.002" .037" .030" .019" .015"
.125" .016" +.002" / -.001" .025" .020" .013" .010"
.063" .008" +.0015" / -.001" .012" .010" - -
.040" .005" +/-.001" .008" .006" - -
.032" .004" +/-.001" .006" - - -
.020" .003" +/-.001" .004" - - -
*may not be available in all desired options
Print Chart    Download Standard_Design.xls

For diameters not listed, please use the following formulas to determine the information you require:
O.D. tolerance = +/- .001" [0.025mm] or +/- 1%, whichever is greater.
Wall thickness = 12% of the O.D. [+/-15% tolerance]
Conductor diameter: 20% of the O.D. [+/-15% tolerance] for 2 wire [single] mineral insulated cable. Duplex material is 16% of the O.D. [+/-15% tolerance]


The sheath of the standard MI cable can withstand an external pressure of 60,000 psi (4218 kg/cm2) as tested at .062" diameter.

Alternate Designs
  • Heavy Wall / Dual Wall

  • Other Links
  • Weight & Metric equivalencies
  • RTD / Passthrough Conductor Cable
  • Haynes™ HR160 Alloy Sheath
  • OMP Cable & Multipoint Specifications/Information
  • Wire Resistance Information
  • Other Information
  • Advanced Thermocouples
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