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Heaters, Sensors, Controllers, Relays, Linear Displacement, and Leadwire

Cartridge Heater Manufacturer

Standard Lead Times


A cartridge heater is a cylindrical industrial heating element that can be inserted into drilled holes. These heaters provide precise, localized heating and are commonly used in the heating process industry. They are often used to heat metal blocks from the inside, and can be custom-made to a specific watt density based on the requirements of the application.

The heater consists of a resistance coil wound around a ceramic core that is surrounded by dielectric and encased in a metal sheath. When powered, heat is transferred through the coil to the sheath, causing it to heat up. This heat is then transferred to the inside of the metal part that needs to be heated.

For easy installation, the heaters are made slightly undersize in comparison to their nominal diameter. Drilling holes with general-purpose drills is usually adequate for low and medium temperature applications (up to 600°F). However, in high watt density applications, it is important to drill and ream the holes for a tighter fit, which will improve heat transfer and increase the heater’s life expectancy.

Cartridge heaters can operate at low, medium, and high watt densities and can withstand working temperatures of up to 1400°F. However, the optimal operating temperature will depend on the specific application. Factors such as watt density, the tightness of the fit, and the thermal conductivity of the material being heated can all impact the actual temperature of the heater and the monitored temperature of the material during the heating cycle.

Cartridge heaters are commonly used for heating dies, platens, molds, and other metal parts by inserting them into drilled holes. They can also be used in liquid immersion applications, such as heating gases and liquids, hot runner molds, hot stamping, laminating presses, medical equipment, semi-conductor, plastic molding and scientific equipment.

To effectively control the temperature of a cartridge heater, it is important to use the appropriate temperature controller and sensor. These devices should be placed between the working surface of the part and the heaters. The temperature of the part approximately 1/2″ away from the heaters is used in selecting the maximum allowable watt density. In high watt density applications, using thyristor power controls can extend the life of the heater by eliminating on-off cycling.


We can also manufacture heaters to exact diameters – ex. 0.496″ Diameter Heaters

Diameter Sizes Available and Tolerances
Sizes – RoundSizes – Square
Nom DiaMin DiaMax DiaMax AmpsMax VoltsNom SizeMin SizeMax SizeMax AmpsMax Volts
1/8″0.1190.1243.6240 3/8″x3/8″0.3690.3749300
1/4″0.2440.249930 1/2″x1/2″0.4940.4999300
6.5mm0.250.2559300 5/8″x5/8″0.6190.62415300
8mm0.3090.3149300Sizes – Rectangle
3/8″0.3690.3749480Nom SizeMax WidthMax DepthMin WattsMax W/in
10mm0.3880.39315480 1/8″x1/4″0.1240.2491030
7/16″0.4320.43715600 1/8″x3/8″0.1240.3741050
12mm0.4660.47115600 1/4″x5/8″0.2490.6241070
12.5mm0.4860.49115600 1/4″x1″0.2490.99910100
  • Length tolerance is +/- 3% or +/- 3/32, whichever is greater.
    (*excludes disc and lead end varied formation lengths)
  • Camber tolerance is .025″ per foot of length. Slight camber is normally not a problem since the heater will flex enough to enter a clean hole.
  • Wattage tolerance is +5%, -10%

1. Welded Disc
2. Stainless steel tube in 304/316/321/INCOLOY
3. Ceramic disc insulator
4. Pure magnesium oxide
5. Nickel-chrome 80/20 heater wire
6. Ceramic core
7. Hard ceramic head
8. Lead Wire
9. Optional Potting Compound

PictureTypeMax TempNotes
MGT 1000°C1832°F / 1000°CFlexible, Not Waterproof
MGT 750°C1382°F / 750°CFlexible, Not Waterproof
Duraflex1022°F / 550°CFlexible, Not Waterproof
MGT842°F / 450°CFlexible, Not Waterproof
TGGT482°F / 250°CDurable, Flexible, Not Waterproof
Teflon500°F / 260°CAbrasion Resistant, Small OD, Waterproof
Silicone Rubber355°F / 180°CVery Flexible, Waterproof, Easy to Nick
SEW2392°F / 200°CVery Flexible, Fair Abrasion Resist, Waterproof
End Seal Options
TypeMax TempMoisture ProtectionContaminant ProtectionMech. StrengthVibration Resist.
Ceramic2500°F 1371°CPoorPoorExcellentExcellent
Teflon300°F 149°CExcellentExcellentVery GoodExcellent
Lava3000°F 1649°CPoorGoodGoodPoor
Cement Potting1800°F 982°CPoorFairGoodPoor
Epoxylite Potting650°F 343°CFairVery GoodVery GoodExcellent
Epoxy Potting265°F 129°CGoodGoodExcellentExcellent
Silicone Rubber500°F 260°CExcellentExcellentFairExcellent
Common Termination StylesPicture
High Temperature Swaged in Leads
High Temperature Leads w/ 90° Exit.
High Temperature Crimped on S/S Braid.
High Temperature Swaged in S/S Braid.
High Temperature Leads w/ 90° Exit & S/S Braid.
High Temperature Leads w/ 90° Exit & S/S Armor.
High Temperature Leads w/ S/S Armor
Post Terminals
special construction
Add Ons Features
Stainless Steel
Single or Double-ended :
1/8″, 1/4″, 3/8″NPT
1/2″, 3/4″, 1″NPT
Single or Double-ended :
1/8″, 1/4″, 3/8″NPT
1/2″, 3/4″, 1″NPT
FlangesStandard Stainless Steel.
Flanges can be round
or irregularly shaped.
Provides extra support for leads.
Great for Flexing applications
Special Constructions
PictureType Notes
Bent HeaterMust be bent in an unheated section
MultiZone or
Distributed Watts
Multi Zone – Up to 3 zones
Distributed Wattage – custom
Double EndedElectrical Termination on Both Sides
– either Lead Wires, Post terminals
(J/K)Type A – Center Core
– Heater Temperature
Type B – Middle
– Block Temperature
Type C – End
– Disk End Temperature
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