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Watlow Firerod Cartridge Heaters
Heavy-Duty Swaged Construction - Thousands from Stock
The Watlow Firerod® Cartridge Heater revolutionized the heating element industry in 1954 when it was patented as the first swaged cartridge heater. With premium materials and tight manufacturing controls, the Firerod heater continues to provide superior heat transfer, uniform temperatures and resistance to oxidation and corrosion even at high temperatures.

Quick Ship on more than 150,000 units

The Watlow Firerod offers many delivery programs to meet your needs. With hundreds of stock sizes and Watlow’s patented Lead Adapter (LA) Method (see below), Watlow can deliver same or next day shipment on over 150,000 different configurations of Firerod. If you need a custom cartridge heater, Watlow’s experience in customized engineering is reflected in over 250,000 Firerod cartridge heater designs.

Features of the Watlow Firerod Cartridge Heater

  • Part temperatures to 1400°F
  • Nickel-chromium resistance wire, precisely wound and centered in the unit, assures even, efficient distribution of heat to the sheath.
  • Magnesium oxide insulation of specific grain and purity, swaged to the proper density, results in high dielectric strength and contributes to faster heat-up.
  • Incoloy sheath resists oxidation and corrosion from many chemicals, heat and atmospheres.
  • Minimal spacing between the element wire and sheath results in lower internal temperature, better heat transfer, giving you the ability to design with fewer or smaller heaters that operate more efficiently.
  • Swaged cartridge tightens the sheath around the MGO insulation and the nichrome element wires for more efficient heat transfer and longer heater life.
  • UL & CSA approved flexible stranded lead wires with silicone-fiberglass oversleeve insulate wires to 480°F.

Click to download Watlow Firerod Catalog pages (pdf 540k)


Watlow’s patented LA--or Lead Adapter--Modification Method allows stock Firerods to be modified from stock with 13 different lead configurations. LA configurations are permanently attached to the heater. Most of these configurations can be ordered with no-heat extensions or optional mounting methods like flanges, threaded fittings, and locating rings. On LA stock, units are shipped either same or next day.

13 Terminations Available with LA Method:

  • Swaged-in flexible leads
  • Right angle leads
  • Straight stainless steel braid
  • Right angle stainless steel braid
  • Right angle stainless steel braid with teflon leads & seal
  • Straight stainless steel hose
  • Right angle stainless steel hose
  • Straight stainless steel hose with teflon leads & seal
  • Right angle stainless steel hose with teflon leads & seal
  • Teflon leads & seal
  • Silicone rubber seal & leads
  • SJO cord
  • MI Leads
Watlow Firerod Cartridge Heater - Stock Lists and Ordering Pages
(Click on the Link for the Diameter and Length that you need.)
1/8" Diam. 1/4" Diam. 3/8" Diam. 1/2" Diam. 5/8" Diam. 3/4" Diam.
All Lengths All Lengths 1" to 2-1/4" Long 1" to 2-3/4" Long 1" to 6" Long All Lengths

2-1/4" to 4-13/16" Long 3" to 5-13/16" Long 6-1/2" to 36" Long

5" to 12-13/16" Long 6" to 18" Long

Watlube Heater Release Agent
Bargain & Overstock Firerod Cartridge Heaters - all diameters
** For non-stock sizes or special options and configurations, please call us at (800) 3WATLOW.
This page last modified on 10/19/2016
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