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Milled Groove Tubular Heaters 

WATROD milled groove heaters are precision-formed and customized to your hot runner mold application. Even tight radius bends of 0.250 inch maintaining tolerances of ±0.062 to ±0.002 inch are possible. This capability not only allows you freedom to design for the optimum uniform heating pattern for your plastics process, but also guarantees quick and easy installation.

Simply send your groove dimensions in a detailed drawing or on CAD file. Depending on the formation requirements, the resulting CAD design will be transferred to either Watlow's CNC bending equipment or a highly skilled bending operator.

A variety of sheath materials are available including Alloy 800, 304 stainless steel and 316 stainless steel; each offering unique advantages of long life in high temperature molds, rigidity to maintain shape during shipment and corrosion resistance.

Watlow not only delivers the heat fast to the process with efficient heat transfer, but guarantees the heater's fast delivery, too. While Watlow guarantees standard deilvery within three to four weeks, tough delivery schedules are Watlow's specialty.


Material Maximum Operating Temperatures Maximum Watt Densities
°F °C W/in2 W/cm2
304 stainless steel  1200 650 60 9.3
Alloy 800  1600 870 60 9.3
  • Precise conformity to customer specifications; bending tolerances as low as ± 0.002 in.
  • Common element diameters: 0.260, 0.315, 0.375 and 0.430 in. (6.6, 8, 9.5 and 10.9 mm)


  • Hot runner molds

Features & Benefits:

Features Benefits
Precise conformity to customer specifications
  • Ensures easy installation
Alloy 800 sheath material
  • Corrosion resistant, capable in high-temperature environments
304 stainless steel
  • Excellent pliability, best choice for small bend radii
Superior resistance coil design
  • Produces even heating
Threaded stud or lead wire termination as required
  • Provides robust options for challenging environments

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Milled Groove Tubular Heaters
Milled Groove Tubular Heaters