Thimble Type oxgen sensor heaters are available in 1,2,3 or 4 wires depending on the construction project. Due to the environment legislations, newer vehicles only use oxygen sensors with internal heater, commonly found in 4-wire sensors, Thimble type with heater starts to work in approximately 40 seconds after ignition.
Thimble Oxygen Sensor Cutaway
1. Ceramic inductor (zirconium tube)
2. Heater rod
3. Protective tube
Features:
Fast ignition: Short ignition time, quickly reaching operating temperature after cold start
Excellent insulation performance: Ceramic material ensures electrical insulation and stable signal transmission
High temperature resistance and anti-poisoning: Resistant to erosion by harmful substances in exhaust gas, extending service life
High compatibility: Applicable to Bosch, Denso, Delphi, NTK & NGK, etc. mainstream brands
Long lifespan design: Manufactured by HTCC process, stable performance and good consistency
Resistance to water and thermal shock: Special protective layer design, reducing the risk of cracking under the impact of condensate water
Regular Product Model
| Model | Size | Voltage | Resistance |
| INC-X5725TA | D2.5*57mm | 13V | 9±1%Ω |
| INC-X5729TDC | D2.9*57mm | 12V | 3.4±0.34Ω |
| INC-X37255TA | D2.55*37mm | 13V | 5±0.5Ω |
| INC-X50295TB | D2.95*50mm | 13V | 4.5±0.5Ω |
| INC-X53430TE | D3*53.4mm | 13V | 13±1Ω |
| INC-X56295TA | D2.95*56mm | 13V | 4.5±0.5Ω |
| INC-X5736TFB | D3.6*57mm | 12V | 2.7~3.3Ω |
| INC-X5736TG | D3.6*57.5mm | 12V | 2.3±0.3Ω |
| INC-X5729TF | D2.9*57mm | 13V | 13±1.3Ω |
Product Assembled And Package Photos：
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Frequently Asked Questions
What is a thimble ceramic heater? How does it improve oxygen sensor performance?
A thimble ceramic heater is an internal heating component manufactured using the HTCC (High-Temperature Co-fired Ceramic) process, designed specifically for automotive oxygen sensors. By heating the zirconium tube to its optimal operating temperature within approximately 40 seconds of ignition, it ensures the sensor functions quickly after a cold start. This fast-heating capability helps reduce cold-start vehicle emissions, improves fuel combustion quality, and assists vehicles in meeting stringent environmental regulations.
Which automotive sensor brands is this heater compatible with? What are its key specifications?
This thimble ceramic heater features high compatibility and is designed to fit major mainstream brands, including Bosch, Denso, Delphi, and NTK & NGK. It is available in various physical dimensions and technical configurations to support 1, 2, 3, or 4-wire projects. Key product models feature diameters ranging from 2.5mm to 3.6mm, lengths from 37mm to 57.5mm, operating voltages of 12V or 13V, and resistance levels calibrated from 2.3Ω to 13Ω.
