Watlow Thermocouple Extension Grade Wire J20-5-502

Since 1914, SERV-RITE thermocouple wire and thermocouple extension wire have been recognized for premium performance and reliability. All stock and custom wire is manufactured in Watlow’s plant where materials, manufacturing equipment and quality controls are carefully selected to ensure superior uniformity. Watlow offers popular wires as well as custom manufactured wire using alloys and insulation types to meet specific application demands. In an effort to better serve our customers Watlow recently adjusted inventory and increased stocking levels of its high quality SERV-RITE thermocouple and extension wire, which has greatly improved availability of standard constructions. All wire is manufactured under rigid quality controls following ISO 9001 standards. In addition, all electromotive force (EMF) versus temperature calibration procedures follow one or more of the following standards: ASTM E 207, ASTM E 220 and AMS 2750. All testing has NIST traceability. Unless otherwise specified, all SERV-RITE thermocouple wire and extension wire are supplied to meet standard tolerances of ASTM E 230.

*Minimum order of 100 ft.* When selecting quantity, a quantity of 1 = 100 ft, a quantity of 2 = 200 ft, etc.

Usually Ships in 3-5 Business Days


SKU: J20-5-502
SKU: J20-5-502 Category: Tags: ,

Watlow Thermocouple Extension Grade Wire J20-5-502

  • Type E, J, K, N, S and T thermocouple wire
  • Compensation extension wire
  • Solid or stranded wire
  • Wide selection of insulation types
  • Color coding
  • Metallic overbraids and wraps
  • Stock RTD lead wire
  • Compliance with recognized agency tolerances
  • Insulation temperature ranges from -328 to 2600?F (-200 to 1427?C)
  • Tolerances from plus or minus 0.5 C or plus or minus 0.4 percent
  • NIST calibration certificates
  • ISO 17025 Accredited Lab

Watlow Thermocouple Extension Grade Wire J20-5-502



Product Line

Thermocouple Extension Grade Wire

Sensor Type




Max Operating Temp

221 F / 105 C

Limits of Error


Wire Gauge

Conductor Type and Tolerance

Extension grade, solid conductor, standard tolerance

Watlow Code Number


Insulation Description


Lead Time

3-5 Business Days (Call us at 301-831-7550 for next day shipping)