Spherical roller bearings are double-row line-contact rotary supporting components. The inner ring has two raceways while the outer ring adopts spherical raceway, delivering excellent self-aligning performance. They effectively compensate coaxiality error, installation misalignment and angular deviation caused by shaft bending deformation. The bearings withstand heavy radial loads as well as bidirectional axial loads, serving as core bearing types for harsh working conditions. They are widely installed on large industrial centrifugal fans, mining crushers, cement ball mills, dryers, paper-making rollers, metallurgical sintering equipment and stone conveyor rollers prone to shaft deflection, assembly deviation and continuous vibration. During operation, foundation settlement, machining errors and insufficient assembly quality lead to shaft offset. Ordinary bearings cannot adapt to angular deviation, easily resulting in rolling element jamming, local overload and premature spalling damage. Benefiting from the unique spherical outer ring structure, spherical roller bearings allow the inner ring and rotating shaft to tilt within a certain angle and eliminate extra stress induced by misalignment. Compared with spherical ball bearings, spherical roller bearings adopt roller line contact structure with greatly improved load capacity. Different from cylindrical roller bearings, they feature self-aligning capacity and better adaptability to assembly errors and equipment deformation. Mining and cement sites are filled with dust and suffer continuous impact vibration with long-term nonstop operation. Ordinary spherical roller bearings on the market usually have defects including defective roller profile design, insufficient cage rigidity and unstable heat treatment. Long-term operation triggers raceway pitting, cage fracture and abnormal temperature rise, leading to equipment shutdown. NMT Spherical Roller Bearings own complete product series including standard clearance, C3 and C4 large clearance specifications, with stamped steel cages and solid brass cages. Sizes cover small-medium universal models and large-bore heavy-duty types, fully meeting diversified heavy-load vibration demands in building materials, mining, wind power and metallurgy industries.

With continuous development of building material, mining and new energy industries, ball mills, large induced draft fans and crushers operate continuously for a long time. Rotating shafts bear heavy loads and tend to deflect during operation. Foundation vibration and assembly deviation constantly cause bearing misalignment. Massive dust invades bearings on production sites, contaminates lubricating grease and accelerates abrasion on rolling contact surfaces. Alternating impact loads act on bearings persistently, imposing strict requirements on uniform force distribution of rolling elements and anti-fatigue performance. A large number of ordinary spherical roller bearings lack optimized crown design for rollers. Severe edge stress concentration emerges under tilted operation and local abrasion develops rapidly. Some stamped cages have weak vibration resistance and tend to crack under continuous impact. Machinery manufacturers are in urgent demand of premium spherical roller bearings with strong load capacity, reliable self-aligning property, vibration resistance, dust & wear resistance and stable long-term operation. Optimized with revised symmetrical roller profile to improve stress distribution under tilted conditions, NMT Spherical Roller Bearings adopt strict high-precision roller grouping procedures to guarantee balanced load on double rows of rollers. Upgraded heat treatment strengthens surface toughness of raceways and rollers to resist dust abrasion and alternating impact, providing stable and reliable supporting solutions for all kinds of heavy industrial equipment suffering shaft deformation and assembly misalignment.

NMT Spherical Roller Bearings consist of spherical outer ring, inner ring with double raceways, two rows of symmetrical barrel rollers and cages. The spherical outer raceway endows bearings with outstanding self-aligning capacity to compensate certain degree of shaft deflection and installation misalignment. Two mainstream cage versions are available. Stamped steel cages feature compact structure and cost advantage for medium-load working conditions. Solid brass cages possess stronger rigidity, superior heat and vibration resistance, prioritized for heavy impact, high temperature and long-time continuous operation scenarios. Barrel rollers adopt precise optimized crown design to effectively relieve edge stress concentration when bearings work in tilted status and avoid local contact abrasion. All rollers undergo dimensional grading and screening before assembly to strictly control dimensional dispersion errors and ensure balanced force on double rows of rolling elements. The products are extensively matched on cement ball mills, vertical mills, mining crushers, large industrial induced draft fans, sintering machines, paper press rolls, stone conveyor rollers and supporting positions of large rotary drying kilns.

Inner rings, outer rings and barrel rollers are manufactured from high-purity alloy bearing steel. Multiple forging processes refine internal grain structure. Segmented precise quenching and tempering guarantee qualified hardness on rolling surfaces while the matrix retains sufficient toughness to resist fatigue spalling induced by continuous alternating impact loads. Multiple superfinishing procedures are carried out on raceways and roller surfaces to reduce surface roughness and relieve frictional heat during rotation. All finished bearings pass dimensional inspection, roller grouping screening, radial clearance verification, long-time vibration durability test and temperature rise test. Unqualified workpieces are eliminated to ensure consistent performance of mass products.

Various radial clearance groups are optional with standard industry outer dimensions and favorable interchangeability for convenient maintenance and replacement of spare parts on heavy equipment such as mining machinery, cement facilities and large fans.

Core Product Advantages

Spherical outer ring structure delivers excellent self-aligning ability to effectively compensate angular deviation caused by shaft bending, assembly misalignment and foundation deformation;

Double-row barrel roller line contact structure achieves powerful radial load capacity and withstands bidirectional axial loads for heavy-load combined stress conditions;

Optimized crown design of symmetrical rollers relieves edge stress concentration under tilted operation, reduces local abrasion and extends service life significantly;

Stamped steel cages and solid brass cages are optional to satisfy medium-load, heavy high-temperature impact and other diversified working conditions;

High-precision grouping and screening of rollers strictly control dimensional deviation and realize balanced load distribution on double rows of rollers to prevent failure from local overload;

Standard, C3 and C4 clearance specifications are available, adapting to high-temperature operation, shaft thermal elongation and dusty severe environments;

Premium alloy bearing steel combined with stable heat treatment delivers excellent fatigue resistance, vibration resistance and wear durability under dusty and impact conditions;

Standard industry outer dimensions achieve strong versatility for easy replacement of spare parts on mining machinery, cement equipment and large fans.

Typical Application Scenarios

Cement ball mills, vertical roller mills and supporting devices of rotary kilns; mining crushers, vibrating feeders and ore conveyor rollers; large centrifugal induced draft fans, blowers and auxiliary transmission mechanisms of wind power equipment; metallurgical sintering equipment and cooling conveying machinery; large paper press rolls and dryer cylinder supporting positions; chemical drying equipment and large stirring devices; complete sets of mechanical equipment for building material stone production lines.

Quality Assurance

Raw materials of NMT Spherical Roller Bearings receive sampling inspection on hardness, metallographic structure and non-metallic inclusions upon warehousing to control raw material quality fundamentally. Forged blanks of inner rings, outer rings and rollers fully release residual forging stress and sequentially undergo precision turning, heat treatment, rough grinding and superfinishing of raceways and rollers. All barrel rollers are graded and grouped according to dimensional precision to guarantee balanced load distribution on double rows of rolling elements during operation. Strength and vibration resistance tests are conducted on formed cages of different types. All finished goods pass visual inspection, radial clearance screening, precision detection and long-time alternating vibration durability & temperature rise test. Bearings dedicated for mining and cement production lines receive additional simulation durability tests under dust and continuous impact conditions. Non-conforming products are separated independently. Every spherical roller bearing realizes flexible self-alignment, stable load capacity and reliable vibration & wear resistance, effectively lowering risks of unexpected shutdown failures of heavy industrial equipment.

Product Range

Standard spherical roller bearings; C3, C4 increased clearance bearings; stamped steel cages, solid brass cages; various size specifications. Model selection depends on load magnitude, vibration intensity, shaft deformation degree and operating temperature.

Brand Strength

NMT devotes to R&D and manufacturing of spherical roller bearings. Targeting operating characteristics including heavy load & vibration, dusty environment, shaft deflection and assembly misalignment for mining, cement facilities and large fans, NMT continuously optimizes barrel roller profile design, precision grinding technology and heat treatment system. The bearings solve industry pain points such as edge stress abrasion, vibration fatigue spalling and excessive operating temperature rise, help heavy equipment manufacturers improve equipment stability and extend maintenance intervals.