In ceramic industry roller kilns, high-temperature bearings support high-speed roller rotation under radiant heat above 1200°C, firing ceramic products. In glass tempering furnaces, bearings operate above 600°C supporting glass conveying and positioning. In metallurgical heat treatment furnace bottom rollers and conveyor chains, bearings maintain long-term reliable operation under sustained high temperatures and alternating thermal stresses. In industrial ovens and drying equipment, bearings support continuous fan operation under high-temperature hot air circulation. In every piece of industrial equipment requiring long-term operation at extreme high temperatures, high-temperature bearings are the core precision components achieving high-temperature resistance, long life and reliable operation.

 

High-temperature bearings are specially designed for long-term stable operation at temperatures above 150°C. Unlike ordinary bearing steel (GCr15) which experiences significant hardness reduction and dimensional instability above 150°C, high-temperature bearings utilize special high-temperature alloy materials and heat treatment processes to maintain sufficient hardness, dimensional stability and fatigue resistance at temperatures from 200°C to 500°C and above. High-temperature bearing lubrication systems are also specially designed——using high-temperature synthetic grease or solid lubricants that do not bleed, carbonize or fail at high temperatures. High-temperature bearing sealing systems use high-temperature specialty rubber or metal seals to maintain sealing performance at high temperatures.

 

High-temperature bearings are classified into medium-temperature bearings (150°C-250°C), high-temperature bearings (250°C-500°C) and ultra-high-temperature bearings (500°C and above) based on operating temperature. Based on material systems, they are classified into high-temperature bearing steel bearings, heat-resistant stainless steel bearings, high-temperature alloy bearings and ceramic bearings. High-temperature bearings are widely used in ceramic industry, glass industry, metallurgical heat treatment, cement industry, chemical reaction equipment, power boilers, aerospace, nuclear industry and various high-temperature industrial equipment.

 

NMT High-Temperature Bearing Technology Solutions

 

Japan NMT high-temperature bearings are specialized product series developed specifically for the stringent requirements of high-temperature industrial equipment——high-temperature resistance, long life, thermal shock resistance and high reliability.

 

High-Temperature Alloy Material System——High-temperature bearing heat resistance depends on material selection. NMT high-temperature bearings offer multiple high-temperature material solutions for different temperature grades and operating conditions. High-temperature bearing steel (M50, M50NiL)——Containing molybdenum, chromium, vanadium and other alloying elements, maintaining high hardness and dimensional stability above 300°C, suitable for medium-to-high temperature applications. Heat-resistant stainless steel (SUS440C, SUS630)——Combining corrosion resistance and heat resistance, suitable for moist and corrosive high-temperature environments below 400°C. High-temperature alloys (Inconel 718, Hastelloy C276)——Nickel-based superalloys maintaining excellent strength and creep resistance above 600°C, suitable for ultra-high-temperature and highly corrosive environments. Silicon nitride ceramic (Si₃N₄)——Full ceramic bearings maintaining excellent dimensional stability and fatigue resistance above 800°C, suitable for extreme high-temperature and oil-free lubrication environments. NMT provides optimal high-temperature material selection based on specific temperature, load and media conditions.

 

High-Temperature Dimensional Stability and Clearance Control——During temperature rise from room temperature to operating temperature, thermal expansion differences between rings and rolling elements can cause clearance changes or binding. NMT high-temperature bearing clearance is precisely calculated with temperature compensation——larger initial clearances (C3, C4 or special clearances) are set at room temperature to achieve proper internal gaps after thermal expansion at operating temperatures. Bearing materials undergo multiple thermal cycling stabilization treatments to eliminate internal stress and maintain dimensional stability through repeated heating and cooling. Ring and rolling element material pairing is thermally expansion coefficient matched to maintain proper internal gaps across the full temperature range. Validated through rigorous high-temperature dimensional stability testing, NMT high-temperature bearings maintain stable geometric and rotational accuracy through repeated room-to-operating temperature cycles.

 

High-Temperature Lubrication and Solid Lubrication Technology——High-temperature bearing lubrication is a key factor determining bearing life. NMT high-temperature bearings offer multiple high-temperature lubrication solutions——High-temperature synthetic grease (150°C-250°C) using ester or ether synthetic base oils with polyurea or PTFE thickeners, maintaining stable consistency and lubrication performance at 150-250°C. High-temperature solid lubricant coatings (250°C-500°C) using physical vapor deposition (PVD) of molybdenum disulfide (MoS₂) or diamond-like carbon (DLC) films on raceways and rolling elements, forming stable solid lubricating films at high temperatures. Full ceramic self-lubricating bearings (500°C-800°C) utilizing inherent low-friction characteristics and high-temperature stability of ceramic materials without external lubrication. NMT provides optimal high-temperature lubrication solutions and maintenance interval recommendations based on operating temperature, load and speed conditions.

 

Heat-Resistant Sealing and Dust Protection——High-temperature bearings typically operate in dusty and hot gas environments, with seal heat resistance and dust protection directly determining bearing life. NMT high-temperature bearings offer multiple sealing solutions——High-temperature fluororubber seals (FKM, -20℃ to 200℃) suitable for medium-temperature applications. Silicone rubber seals (VMQ, -60℃ to 230℃) offering wider temperature range capability. Perfluoroelastomer seals (FFKM, -20℃ to 320℃) suitable for high-temperature and highly corrosive environments. Metal seals (metal shields/labyrinth seals) suitable for ultra-high-temperature applications without rubber aging issues. Seal geometry is optimized to maintain sealing performance at high temperatures while keeping friction torque within reasonable limits.

 

Thermal Shock and Thermal Fatigue Resistance——During equipment start-up and shutdown, bearings experience drastic temperature changes (cold start-heat-up-cool-down-cold start cycles). NMT high-temperature bearing materials are thermal-shock optimized——high-purity materials eliminate micro-defects and reduce thermal stress concentration; material thermal conductivity and thermal expansion coefficients are matched to minimize internal stress from temperature gradients. Bearing ring wall thickness is optimized to maintain low thermal gradient stress during rapid temperature changes. Validated through rigorous thermal cycling testing, NMT high-temperature bearings maintain structural integrity and rotational accuracy through hundreds of room-temperature to high-temperature cycles, effectively resisting thermal shock and thermal fatigue damage.

 

High-Temperature Cage Design——High-temperature bearing cages must maintain sufficient strength and dimensional stability at elevated temperatures. NMT high-temperature bearings offer multiple high-temperature cage options——High-temperature engineering plastic (PEEK, PI, 260-300℃ resistance) suitable for medium-to-high temperature and high-speed applications with good self-lubrication and low noise. Metal cages (stainless steel stamped/brass solid, 300-500℃ resistance) with high strength and excellent thermal stability for heavy-load and ultra-high-temperature applications. Ceramic cages (silicon nitride, 800℃+ resistance) for extreme high-temperature environments. Cage pockets are optimized to maintain proper guidance clearances after thermal expansion, ensuring accurate rolling element guidance.

 

Comprehensive Product Range——NMT high-temperature bearings offer diverse product ranges for different temperature grades and equipment types. High-temperature deep groove ball bearings——Most versatile type for combined radial and axial loads, operating temperatures 150-500℃. High-temperature angular contact ball bearings——For high speeds and axial loads, operating temperatures 150-500℃. High-temperature spherical roller bearings——Self-aligning for heavy loads and shaft deflection, operating temperatures 150-400℃. High-temperature cylindrical roller bearings——Highest radial load capacity for heavy radial loads, operating temperatures 150-500℃. High-temperature ceramic bearings——Full ceramic or hybrid ceramic ball bearings, operating temperatures 500-800℃+ . All product ranges are available in M50, SUS440C, Inconel 718, silicon nitride and other material options, with C3/C4/special clearance grades and multiple sealing options.

 

Why Choose NMT High-Temperature Bearings?

 

Compared to conventional bearings and industry-standard high-temperature bearings, NMT high-temperature bearings offer distinct advantages:

 

M50/SUS440C/Inconel 718/silicon nitride multiple material systems for 150-800℃+ temperature grades

 

Precision temperature-compensated clearance calculation for proper gaps at operating temperatures

 

Multiple thermal cycling stabilization treatment for stress elimination and dimensional stability

 

High-temperature synthetic grease/solid lubricant coating/self-lubricating ceramic multiple options

 

PVD/MoS₂/DLC solid lubricant coatings for 250-500℃ stable lubrication

 

FKM/VMQ/FFKM/metal seals multiple options for different temperatures and media

 

Thermal-shock-optimized materials for structural integrity through hundreds of thermal cycles

 

Optimized ring wall thickness for reduced thermal gradient stress

 

PEEK/PI/stainless steel/brass/ceramic multiple cage options

 

Deep groove/angular contact/spherical roller/cylindrical roller/ceramic full coverage

 

Passed high-temperature dimensional stability, thermal cycling, lubricant retention and life testing

 

These performance advantages establish NMT high-temperature bearings as the core precision components for ceramic industry roller kilns, glass tempering furnaces, metallurgical heat treatment furnaces, industrial ovens and various high-temperature industrial equipment.

 

Application Scenarios

 

Ceramic industry roller kiln high-temperature bearings

 

Glass tempering furnaces and glass forming equipment bearings

 

Metallurgical heat treatment furnace bottom roller bearings

 

Industrial ovens and high-temperature drying equipment bearings

 

Cement rotary kilns and coolers bearings

 

Chemical reactors and high-temperature pipeline bearings

 

Power boilers and heat exchange equipment bearings

 

Aerospace high-temperature component bearings

 

Precision Manufacturing

 

Produced strictly according to ISO precision standards and high-temperature bearing manufacturing specifications, with zero-defect quality execution, NMT high-temperature bearings utilize high-temperature alloy/heat-resistant stainless steel/ceramic materials, processed through vacuum melting and refining, precision heat treatment/hot isostatic pressing sintering, high-temperature dimensional stabilization treatment, raceway precision grinding and superfinishing, precision rolling element screening and grouping, high-temperature cage precision forming, optional seal precision assembly, high-temperature grease precision filling/solid lubricant coating deposition, rotational accuracy inspection, high-temperature clearance precision control, high-temperature dimensional stability testing, thermal cycling testing and high-temperature lubricant retention testing. Every product is processed through fully automatic grinding and superfinishing in temperature-controlled clean workshops, with critical dimensional tolerances and high-temperature clearance control strictly controlled—ensuring high-temperature resistance, long life and high reliability.

 

Product Range

 

High-temperature deep groove ball bearings

 

High-temperature angular contact ball bearings

 

High-temperature spherical roller bearings

 

High-temperature cylindrical roller bearings

 

Hybrid ceramic high-temperature bearings

 

Full ceramic high-temperature bearings (silicon nitride)

 

Custom non-standard high-temperature bearings

 

Global Industrial Service

 

Japan NMT supplies high-quality high-temperature bearings to global ceramic industry equipment manufacturers, glass machinery companies, metallurgical heat treatment equipment suppliers and high-temperature industrial users. With high-temperature long-life precision engineering and long-term stable reliable performance, NMT continuously empowers long-term continuous operation of global high-temperature industrial equipment.