Spherical roller bearings are composed of inner rings, outer rings, two rows of symmetrical spherical rollers and cages. The outer rings are equipped with spherical inner raceways and deliver excellent self-aligning performance, which can effectively compensate angular misalignment caused by assembly deviation, spindle deflection and foundation settlement. The bearings feature extremely high load capacity, capable of bearing heavy radial loads and bidirectional axial loads simultaneously with outstanding impact resistance and stable operation. They are suitable for low-speed, heavy-load working conditions with severe vibration, serving as core supporting components for heavy industrial equipment such as mining, metallurgy, building materials and papermaking machinery. The products are widely used in ball mills, crushers, sintering equipment, steel rolling machinery, dryers, large conveyors, vibrating screens and complete cement production equipment.

Compared with self-aligning ball bearings, spherical roller bearings adopt spherical rollers as rolling elements with larger contact area, greatly improved ultimate load capacity and remarkable advantages in impact and heavy load resistance, while friction resistance is relatively higher and the maximum allowable rotating speed is lower. Different from cylindrical roller bearings, this product possesses unique self-aligning capacity. No roller jamming or local overload abrasion occurs when shafts bend or equipment bases deform, making it ideal for heavy-duty units with harsh working conditions and difficult long-term coaxiality maintenance. Heavy industrial equipment runs under full load all year round accompanied by impact loads and continuous vibration. Operation sites are generally exposed to dust, high temperature, moisture and other adverse factors. If bearings without self-aligning capability are adopted, long-term eccentric load operation will easily lead to rolling element fragmentation and raceway spalling, causing major shutdown accidents. Ordinary spherical roller bearings on the market often suffer from insufficient machining precision of roller profiles, weak structural strength of cages and poor lubrication adaptability. Premature fatigue damage tends to occur under heavy impact loads, shortening equipment overhaul cycles.

NMT Spherical Roller Bearings own a complete product portfolio with standard symmetrical roller structures. Multiple clearance specifications including normal clearance, enlarged C3 clearance and C4 clearance are available. Stamped steel cages and solid brass cages are optional. Specifications cover small-medium, medium-large and large heavy-duty bearings, fully meeting assembly demands of various heavy machinery in mining, metallurgy, cement and papermaking industries.

With the continuous development of large-scale heavy industry equipment, crushers, mills and large conveying equipment are upgraded toward larger load and longer continuous operation duration. Equipment bears continuous impact and vibration during operation, while operation sites feature dense dust and large temperature fluctuation. Strict requirements are put forward for bearing load capacity, impact resistance, self-aligning stability and long-term high-temperature lubrication performance, aiming to extend equipment maintenance intervals and reduce production losses caused by shutdown. Conventional spherical roller bearings lack sufficient optimization on spherical roller curves. Stress concentration easily emerges under heavy load conditions. Limited dust-proof and heat-resistant structural design will accelerate bearing failure due to dust intrusion and grease aging at high temperature, failing to satisfy all-weather uninterrupted production requirements of heavy equipment. Heavy industry, mining and manufacturing enterprises are in urgent need of high-quality spherical roller bearing solutions featuring high load capacity, impact resistance and stable self-aligning performance.

NMT Spherical Roller Bearings adopt optimized curved profiles for spherical rollers to improve contact status between rollers and raceways, and evenly distribute contact stress under heavy load and shaft deflection conditions. Dimensional and profile precision of rollers are strictly controlled with a complete roller grading and screening system. Special ultra-precision grinding technology is applied on inner and outer raceways to improve surface finish. Heat treatment processes are continuously upgraded to balance surface hardness and core toughness of steel and enhance anti-impact fatigue performance. Structural strength of cages is optimized, while sealing matching structure is improved to block solid dust intrusion and slow down grease deterioration under high temperature, delivering stable and reliable supporting guarantee for large industrial equipment operating under heavy load and vibration.

NMT Spherical Roller Bearings consist of inner rings, outer rings, double-row symmetrical spherical rollers and high-strength cages. Spherical raceways of outer rings endow bearings with excellent self-aligning ability to effectively compensate shaft deflection and assembly misalignment. Stamped steel cages are used for regular working conditions, while solid brass cages feature higher strength and adapt to harsh scenarios with heavy impact and elevated temperature. Normal clearance applies to regular heavy-duty equipment operating at normal temperature. Enlarged C3 and C4 clearances fit large units with heavy load, obvious temperature rise and alternating high-low speed operation. Double-row spherical rollers cooperate with precision spherical raceways to withstand huge radial loads, bidirectional axial loads and instantaneous impact loads. All rollers undergo precise profile grading screening before assembly to guarantee uniform load distribution and avoid raceway damage caused by local stress concentration. The products are extensively applied in ball mills, cone crushers, steel rolling mills, rotary dryers, vibrating screens, large belt conveyors, paper pressing equipment and complete cement production line machinery.

Ultra-high purity special bearing alloy steel is selected for inner rings, outer rings and spherical rollers. Multi-directional forging fully refines internal grain structure. Segmented precise constant-temperature quenching and tempering balance high surface hardness of raceways and excellent matrix toughness to resist fatigue spalling damage caused by continuous alternating heavy loads and impacts. Multi-layer special ultra-precision grinding is implemented on inner and outer spherical raceways to optimize surface micro-morphology, facilitate stable oil film formation of high-pressure lubricating grease and restrain frictional temperature rise generated during continuous heavy-load operation. All finished products pass geometric dimension inspection, roller grouping verification, radial clearance sorting, heavy-load endurance impact test and sampling fatigue life verification. Defective workpieces are eliminated to guarantee consistent performance of mass-produced bearings.

Various clearance specifications and cage types are optional. International standard outer dimensions ensure excellent interchangeability for convenient assembly, commissioning and overhaul replacement of all kinds of heavy-duty units.

Core Product Advantages

Spherical outer raceways matched with double-row spherical rollers deliver powerful self-aligning capacity to compensate angular misalignment caused by shaft deflection, assembly deviation and equipment deformation.

Large contact area of spherical rollers provides outstanding load capacity to bear heavy radial loads and bidirectional axial loads with remarkable impact and vibration resistance.

Multiple cage options including stamped steel cages and solid brass cages adapt to regular environments and harsh production sites with high temperature and heavy impact.

Complete clearance options: normal clearance, C3 and C4 enlarged clearance, satisfying operating requirements of normal-temperature conventional units and large heavy-load equipment prone to temperature rise.

Precisely optimized roller profiles and grading screening control profile precision to realize uniform load distribution under heavy load and deflection and delay fatigue spalling.

Ultra-precision grinding on inner and outer spherical raceways reduces friction coefficient, improve lubrication effect and control temperature rise during long-term heavy-load operation.

Special alloy steel combined with mature heat treatment achieves surface wear resistance and core impact resistance to effectively resist alternating fatigue damage under heavy load.

Standardized outer dimensions with strong universality, widely applicable to heavy industrial machinery in mining, metallurgy, cement, papermaking and building material industries.

Typical Application Scenarios

Ball mills, rod mills, cone crushers, jaw crushers; metallurgical steel rolling equipment, sintering machines, cooling trolleys; cement rotary kilns, dryers, vertical mills, powder separators; vibrating screens, large belt conveyors; paper press rolls, large drying equipment; port heavy conveying machinery, complete building material production equipment.

Quality Assurance

Raw materials of NMT Spherical Roller Bearings receive sampling inspection for hardness, metallographic structure and non-metallic inclusions upon warehousing to control raw material quality fundamentally. Forged blanks of inner and outer rings fully release residual forging stress and sequentially undergo precision turning, heat treatment, rough grinding and ultra-precision raceway grinding. All spherical rollers are graded and grouped according to high-precision standards to guarantee uniform load distribution under eccentric load and impact conditions. Cages of different materials pass strength, high-temperature resistance and wear resistance tests after forming. All finished goods pass visual inspection, clearance screening, heavy-load impact test and endurance temperature rise test. Non-conforming products are separated independently. Every spherical roller bearing features flexible self-alignment, stable load capacity and impact endurance, supporting long-term continuous safe production of complete heavy industrial equipment.

Product Range

Open type spherical roller bearings; normal clearance, C3 and C4 clearance optional; stamped steel cages and solid brass cages; specifications cover small-medium, medium-large and large heavy-duty spherical roller bearings. Model selection depends on load magnitude, impact intensity, ambient temperature and vibration level.

Brand Strength

NMT focuses on R&D and manufacturing of heavy-duty high-load bearings. Targeting complex working conditions of mining, metallurgy and cement heavy equipment including long-term heavy load, continuous impact vibration, high temperature and heavy dust, NMT continuously optimizes spherical roller curves, roller screening standards, cage structures and heat treatment processes. It solves common industry problems such as spalling under eccentric heavy load, roller damage under impact and lubrication failure at high temperature. NMT helps heavy industry enterprises extend equipment operation cycles and cut production losses brought by equipment shutdown and maintenance.