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Mineral Insulated Cable


Dimensions for our most common Mineral Insulated Cable design for thermocouples is in the table below. Further designs can be accessed at the links below.

Standard Design
Diam. Diameter Tolerance Wall Wire Diameter
2 wire 4 wire 6 wire* 8 wire*
.500” +.003”/-.003” .064” .098” .080” .051” .040”
.375” +.003”/-.0025” .048” .074” .060” .038” .030”
.313” +.003”/-.0025” .040” .061” .050” .032” .025”
.250” +.003”/-.0025” .032” .049” .040” .026” .020”
.188” +.002”/-.0025” .024” .037” .030” .019” .015”
.125” +.003”/-.0025” .016” .025” .020” .013” .010”
.063” +.0015”/-.002” .008” .012” .010” n/a n/a
.040” +.001”/-.002” .005” .008” .006” n/a n/a
.032” +.001”/-.001” .004” .006” n/a n/a n/a
.020” +.001”/-.001” .003” .004” n/a n/a n/a

*may not be available in all desired options

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.