HT-6208-800°C High-Temperature Bearing

Full-ceramic, solid-lubricated deep groove ball bearing for continuous operation in furnaces, kilns, and heat treatment lines.

The HT-6208-800°C is a full-ceramic, solid-lubricated deep groove ball bearing designed for continuous operation in high-temperature environments, including furnaces, kilns, and heat treatment production lines.

Part of the HTX series, the HT-6208 is developed for procurement teams seeking to reduce unplanned shutdowns, extend bearing replacement intervals, and lower total maintenance costs in applications operating at temperatures of 800°C and above.

Featuring a monolithic ceramic construction using SSiC or Si₃N₄ and solid lubricants such as graphite or hexagonal boron nitride (hBN), this bearing is designed to deliver high-temperature stability, oxidation resistance, and reduced lubrication requirements in demanding industrial environments.

With a 40 mm bore, 80 mm outside diameter, and 18 mm width, the HT-6208 matches the basic dimensions of a standard 6208 bearing, providing a dimensional replacement option for suitable furnace conveyor, kiln, and heat treatment equipment.

Looking for a high-temperature bearing for your furnace line?

Send TOJO your operating temperature, speed, load, and atmosphere conditions for an application-specific bearing recommendation and quotation.

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Technical Specifications

Key Features and Engineering Benefits

Full-Ceramic Construction for High-Temperature Operation

The HT-6208 uses a monolithic ceramic construction based on SSiC or Si₃N₄. This design is intended for demanding thermal environments where conventional bearing materials and lubrication systems may be unsuitable. Its ceramic construction provides thermal stability, oxidation resistance, and corrosion resistance for specified high-temperature applications.

Solid Lubrication for Reduced Maintenance

Using solid lubricants such as graphite or hBN, the HT-6208 is designed to reduce dependence on conventional grease lubrication in high-temperature environments. This configuration supports applications where lubricant degradation, relubrication requirements, and repeated maintenance interventions are important procurement considerations.

Thermal Expansion and Clearance Management

Thermal expansion can affect bearing internal clearance, shaft fits, and operating stability. Appropriate clearance selection and thermal expansion management are therefore important when installing bearings in furnace and kiln equipment. TOJO can provide application-specific support for evaluating operating conditions and selecting a suitable bearing configuration.

Support for Longer Replacement Intervals

In continuous production environments, premature bearing failure can lead to replacement labor, production interruptions, and unplanned shutdowns. The HT-6208 is designed to support high-temperature bearing applications where reduced maintenance requirements and longer replacement intervals are key operational objectives. Actual service life depends on the application and operating conditions.

Typical Applications

● Continuous Furnace Conveyor Systems — For furnace conveyor rollers, hearth rolls, drive rolls, and support positions exposed to sustained high temperatures.

● Heat Treatment Production Lines — For bearing positions in quenching, tempering, and annealing furnace equipment where conventional lubrication systems may be unsuitable.

● Tunnel Kiln Systems — For suitable kiln car wheel and roller hearth applications in ceramic, brick, and other high-temperature manufacturing processes.

● Industrial Ovens and High-Temperature Equipment — For selected high-temperature fan, blower, and other industrial equipment applications where the bearing configuration matches the operating requirements.

● Specialized High-Temperature Systems — The HTX series may also be considered for specialized applications, including aerospace turbine and nuclear systems, subject to application-specific engineering evaluation.

Engineering Support for Procurement Teams

Dimensional Replacement Assessment

The HT-6208 has basic dimensions of 40 × 80 × 18 mm, matching a standard 6208 bearing. Dimensional compatibility provides a starting point for replacement assessment. Before installation, TOJO can help evaluate shaft and housing fits, operating clearance, thermal expansion, load conditions, speed, and mounting requirements.

Thermal Expansion and Clearance Selection

TOJO provides support for reviewing thermal expansion and internal clearance requirements according to the intended operating environment. The objective is to select a suitable configuration for stable operation under the specified conditions.

Existing Bearing Failure Assessment

If existing bearings experience premature failure in furnace or kiln equipment, TOJO can review the reported failure mode and operating conditions to help identify potential causes and recommend a suitable HTX configuration.

Sample Evaluation

Samples are available for evaluation testing before larger procurement orders. This allows customers to assess suitability within their equipment and production environment.

Procurement Information

Request a Quote for HT-6208-800°C

Looking for a high-temperature ceramic bearing for your furnace, kiln, or heat treatment production line? Contact TOJO with the following information to help us evaluate your application:

● Current bearing model or required dimensions

● Operating temperature

● Operating speed (rpm)

● Load conditions

● Furnace atmosphere and environmental conditions

● Required quantity

● Installation or equipment requirements

TOJO engineers will respond within 24 hours with a replacement recommendation, expected service life assessment, and quotation.

Request a Quote →    

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