Cartridge heaters
Cartridge heaters from KMT Heiztechnik deliver heat exactly where it is needed — in tools, molds and nozzles. Three power classes, diameters from 6.5 to 25 mm, temperatures up to 750 °C and watt densities up to 40 W/cm² — supplied from quantity one, exactly to your specifications.
Pinpoint heat
Concentrated power in the smallest space.
Cartridge heaters are the standard element for tool heating: inserted into a mounting bore, they bring high power directly to the point in the tool where it is needed. We supply every cartridge custom-made to your specifications — from quantity one.
Inside, a NiCr 80/20 coil works around a ceramic core, embedded in highly compacted magnesium oxide and enclosed by a stainless steel sheath. The power class — low, medium or high-density — determines how much watt density the cartridge can withstand continuously.
Three power classes
From low power density for moderate temperatures to the high-performance class with up to 40 W/cm² — the class depends on power requirements and service-life needs.
Robust up to 750 °C
Highly compacted magnesium oxide, NiCr 80/20 heating conductor and stainless steel sheath — resistant to vibration, moisture and frequent temperature changes.
Integrated temperature measurement
Sensor directly in the cartridge: thermocouple Type J or K, or PT100, in three measuring point positions. From ø 10 mm, also thermostat or thermal fuse.
From quantity one
From a single spare part to series requirements for tool and mold making — also as an exact replacement for third-party products.
The right choice
Three power classes
The power class determines watt density, service life and requirements for the installation situation — we advise you on the selection.
Low power density
For applications with moderate temperatures up to about 300 °C. Uncritical fit, economical and designed for maximum service life.
Medium power density
The balanced ratio of thermal power and service life — the standard choice for mold and tool making.
High-performance
Highly compacted for watt densities up to 40 W/cm² and temperatures up to 750 °C. Requirement: precise mounting bore with H7 fit.
Specifications
Technical data
Precision heating elements for demanding thermal applications. Every cartridge heater is designed individually for you based on these technical standards.
| Sheath material | Stainless steel 1.4541 |
| Heating conductor | Nickel-chromium 80/20 |
| Insulation | Highly compacted magnesium oxide |
| Diameter | 6.5 – 25 mm, metric and imperial (special sizes on request) |
| Temperature | up to 750 °C (up to 1,000 °C on request) |
| Watt density | up to 40 W/cm² (up to 60 W/cm² on request) |
| Voltage | up to 480 V |
| Power tolerance | +5% / −10% |
| Insulation resistance | ≥ 5 MΩ (500 V DC) |
| Length tolerance | ±1.5% (minimum ±1 mm) |
| Mounting bore | H7 fit recommended |
Safety notes
Mounting & safety
Proper mounting is a prerequisite for the function, service life and operational safety of your heating system.
!The fit determines the service life
Heat must flow from the cartridge into the component — this only works with a snug fit in the mounting bore. Every air gap acts as an insulator: heat builds up, the heating conductor overheats, and the cartridge fails prematurely.
- Machine the mounting bore with H7 fit — clean, burr-free and reamed throughout.
- Design power conservatively rather than oversizing — the minimum necessary watt density significantly extends service life.
For control, the following applies: position the sensor at the hottest point of the tool and favor constant temperatures — hard on/off cycling strains the heating conductor. Choose cable protection to match temperature, media and movement at the installation site.
Mounting check
- 01Mounting bore H7 — clean & burr-free
- 02Bore reamed throughout, without steps
- 03Insert cartridge without force — never hammer in
- 04Design power conservatively rather than oversizing
- 05Position sensor at the hottest point
- 06Favor constant temperatures — avoid hard on/off cycling
- 07Choose cable protection to match temperature & environment
Range of designs
Special series & options
On request
Up to 1,000 °C and 60 W/cm² thanks to Incoloy® sheath and double-compacted construction — for applications where standard cartridges reach their limits.
Self-clamping
The cartridge expands radially during heat-up and seats in full-surface contact even in oversized bores — non-destructively removable.
IP67
Dust- and water-tight sealed — for the food sector and environments with regular machine cleaning.
Square cartridge heaters
Square cross-section for surfaces and grooves where round cartridges cannot be secured.
Options & accessories
The full range of designs would exceed any website — here are the most important options. We clarify everything else in the inquiry or send you the catalog.
Expertise
Application areas
Injection molds and mold making
Hot runner systems
Die casting molds
Packaging machines (sealing tools)
Screen changers and filtration systems
Fluid and media heating
Heat sealing and hot stamping
Special-purpose machinery
Technical documentation
* Documentation available on request already now — please use our form.
FAQ
Frequently asked questions
No. We supply cartridge heaters from a quantity of one — from a single spare part to series requirements for tool and mold making. Every cartridge is configured to order according to your specifications.
That depends on the power required over the available surface area. Low watt-density cartridges are the economical choice for moderate temperatures; the medium class offers the balanced ratio of output and service life; high-performance cartridges tolerate watt densities of up to 40 W/cm², but place higher demands on the fit of the bore. If in doubt, we size the cartridge together with you.
Every air gap between the cartridge and the bore wall acts as an insulator: heat builds up inside the cartridge, the heating element overheats, and service life decreases. The tighter and cleaner the bore tolerance, the better the heat is dissipated. Please state the bore diameter — and, if known, the bore tolerance — in your inquiry.
From a simple nickel lead wire, through leads with glass-silk, PTFE or silicone insulation, to a corrugated metal or braided sleeve for mechanical protection. Threaded nipples, flanges and potted terminal heads are also possible. The right variant depends on ambient temperature, media and mechanical stress at the connection.
Yes — as a type J or type K thermocouple or as a PT100 resistance sensor, optionally insulated from the heating element, resting against the sheath, or at a defined position inside the heater. From ø 10 mm, a thermostat or thermal cut-off can also be integrated. Alternatively, separate sensors in their own measuring bore near the cartridge are an option. Please state the desired variant in your inquiry.
Yes. Send us the old part or the nameplate data (diameter, length, voltage, power) — we determine the matching design and supply an equivalent replacement. Even with different connection types, we can usually find a compatible solution.
Diameter, length, voltage, power and connection type form the basis; plus the installation situation and the bore tolerance. The full list is in the checklist on the inquiry form.
You provide us with the key technical data, we check the sizing — in particular watt density and fit — and get in touch directly with you if anything is unclear. You then receive a quote; after ordering, the cartridge is manufactured and delivered to order.
Our range
More products
Inquiry checklist
This is what we need for your quote:
- 01Diameter and length of the cartridge heater
- 02Bore diameter and — if known — tolerance/fit of the mounting bore
- 03Voltage and power
- 04Connection type (lead wire type, protective sleeve, threaded nipple) and lead length
- 05Temperature sensor required? (Type J/K/PT100, thermostat or thermal cut-off)
- 06Installation situation: component material, installation orientation, ambient temperature
- 07Unheated zones required? (position and length)
- 08Quantity
- 09If available: drawing or sample cartridge
Request a Product
Free and non-binding — sent directly to our technical sales team.