Cement rotary kilns, mining crushers, large industrial fans, vibrating screens, paper press rolls and building material conveying equipment frequently suffer shaft misalignment, frame deformation, heavy vibration and impact loads. Ordinary cylindrical roller bearings cannot compensate angular deviation caused by assembly misalignment. Once the shaft tilts, rolling elements bear uneven loads accompanied by severe local abrasion, leading to premature bearing failure. Spherical roller bearings feature spherical outer raceways with outstanding self-aligning capacity to absorb angular errors from shaft deflection and assembly deviation. Adopting double-row roller line-contact structure, they possess powerful radial load capacity and withstand bidirectional combined axial loads. Many open-air industrial equipment operates under harsh conditions including heavy dust, drastic temperature fluctuation and continuous vibration, setting extremely high standards for bearing fatigue resistance and shock resistance. NMT Spherical Roller Bearings are designed with multiple internal structures including CA, CC and MB series, widely used in heavy rotating equipment in metallurgy, mining, cement and power industries.

Large-scale equipment in cement, mining and metallurgy industries keeps expanding with increasing unit power. Frequent alternating loads are generated during startup and material impact. Low-grade spherical roller bearings suffer unbalanced stress distribution due to insufficient precision of roller profile machining. Lubricating grease deteriorates rapidly under high temperature, triggering fatigue damage on rolling elements. Affected by self-weight, rotating shafts of large fans and rotary kilns produce obvious deflection during operation. Bearings without sufficient self-aligning margin generate continuous additional stress and drastically shorten service life. Industrial enterprises face extremely high cost for equipment shutdown maintenance. Customers are in urgent need of high-performance spherical roller bearings integrating self-aligning capability, ultra-high load capacity, vibration resistance and adaptability to dusty environments. Optimized with combined design of spherical raceway and logarithmic profiled rollers for balanced load distribution and reduced frictional heat, NMT Spherical Roller Bearings are equipped with various cages to adapt to complicated harsh conditions such as heavy dust, strong impact and misaligned operation, delivering stable support solutions for heavy industrial rotating machinery.

Designed with double-row symmetrical rollers, NMT Spherical Roller Bearings adopt spherical outer raceways to realize superior self-aligning performance and tolerate certain shaft deflection and assembly misalignment. Multiple internal configurations are available: CA type with solid brass cage featuring strong shock and high temperature resistance for heavy-load vibration conditions; CC type with stamped steel cage and internal lubrication optimization structure for lower friction and continuous medium-high speed operation; MB type with solid cage possessing stable structure, mostly applied in large low-speed heavy-duty equipment. Double-row rollers and raceways form line-contact support to bear huge radial loads and bidirectional axial loads simultaneously with excellent comprehensive load capacity. Rollers are processed with super-finished profiling to relieve edge stress concentration and restrain premature peeling under long-term heavy load. Multiple clearance grades are optional to accommodate shaft thermal expansion caused by high temperature under heavy load. The products are extensively matched with cement rotary kilns, vertical mills, mining vibrating screens, centrifugal fan main shafts, metallurgical cooling rolls, sand conveyor drums and wood crushing equipment.

Inner rings, outer rings and rollers are manufactured from high-purity vacuum degassed bearing steel treated by deep quenching heat treatment, balancing surface hardness and core toughness to resist cracking under continuous impact loads. Superfinishing is conducted on spherical raceways and rollers to reduce contact friction and heat accumulation. All finished products pass dimensional inspection, clearance classification and rotation noise testing. Bearings for heavy mining and cement equipment receive additional alternating load durability simulation tests. Products with abnormal performance are eliminated to guarantee consistent quality in each batch.

The complete product series covers normal clearance, C3, C4 and C5 enlarged clearance with diversified internal structures, supplying reliable bearing solutions for heavy machinery prone to shaft misalignment.

Core Product Advantages

Spherical outer raceway provides excellent self-aligning ability to compensate angular deviation caused by shaft deflection and assembly misalignment;

Double-row roller line-contact structure delivers outstanding radial load capacity and withstands bidirectional axial loads with superior comprehensive load performance;

Multiple internal structures CA/CC/MB optional; brass cages and steel cages adapt to different rotating speed and impact conditions;

Logarithmic roller profiling improves load distribution, reduces edge stress, delays fatigue peeling and extends service life;

Rich clearance specifications including normal clearance, C3/C4/C5 enlarged clearance adapt to shaft thermal deformation under heavy load and high temperature;

Excellent vibration and shock resistance, suitable for continuous impact working conditions of mining, cement and sand production lines;

Dimensions comply with international general standards with strong interchangeability. No modification on bearing housings required during renovation and replacement of new and old heavy equipment;

Adaptable to harsh industrial environments with heavy dust and wide temperature range. Matching sealing devices can further promote dust-proof performance.

Typical Application Scenarios

Transmission parts of cement rotary kilns, vertical coal mills and coolers; mining vibrating screens, crushers and sand conveyor drums; main shafts of large induced draft fans, forced draft fans and industrial centrifugal fans in power plants; cooling roll and transport roll assemblies for metallurgical production lines; press rolls and drying rolls of paper-making machinery; wood and ore crushing equipment; heavy belt conveyors for building materials and ports.

Quality Assurance

Raw materials of NMT Spherical Roller Bearings receive sampling inspection on metallographic structure and hardness upon arrival to strictly control non-metallic impurities inside steel. Forged blanks of inner rings, outer rings and rollers fully eliminate forging stress and go through precision turning, heat treatment, rough grinding and superfinishing in sequence. Rolling rollers are grouped and assembled accurately according to dimensions to guarantee even load distribution on double rows. Cages undergo precision machining and burr removal to ensure free and flexible movement of rollers. All finished bearings pass appearance inspection, radial clearance sorting and no-load rotation testing. Additional impact fatigue simulation tests are carried out for heavy-duty models used in mining and cement industries. Defective products are sorted separately. Each spherical roller bearing ensures smooth self-alignment, stable load bearing and qualified vibration resistance, offering long-term reliable operation guarantee for heavy rotating equipment working in harsh conditions.

Product Range

CA spherical roller bearings with brass cage, CC spherical roller bearings with steel cage, MB spherical roller bearings with solid cage; specifications of normal clearance, C3, C4, C5 enlarged clearance. Model selection based on load magnitude, shaft deflection degree, vibration level and operating temperature.

Brand Strength

NMT focuses on R&D and manufacturing of heavy-duty spherical roller bearings. Targeting common conditions of misalignment, intense vibration and alternating loads in cement, mining and fan equipment, NMT continuously optimizes spherical raceway machining precision, roller profiling technology and heat treatment processes. The bearings effectively mitigate common failures including partial load abrasion, overheating aging and impact damage. NMT helps industrial enterprises reduce equipment shutdown frequency and cut long-term operation, maintenance and replacement costs.