Mining equipment, stone vibrating screens, cement mills, large conveyors, metallurgical rolling mills and construction machinery transmission systems operate under harsh conditions featuring heavy dust, intense vibration and alternating shock loads for a long time. Transmission shafts are prone to misalignment and deflection under heavy load. Ordinary cylindrical roller bearings and deep groove ball bearings have no self-aligning capacity. Once shaft tilt occurs, uneven roller loading and local overheating easily emerge, leading to severe abrasion or bearing seizure within a short period and triggering production shutdown. Most heavy-duty equipment bears combined radial and axial loads, while single-type bearings have limited load capacity and cannot run stably over long cycles. In addition, mining and building material equipment usually have narrow maintenance space with high downtime costs. Customers require bearings with excellent anti-fatigue performance and long service life, which can tolerate assembly coaxial errors and continuous impact to extend maintenance intervals. NMT Spherical Roller Bearings adopt spherical raceway self-aligning structure and double-row symmetric roller design. They withstand large radial loads and bidirectional axial loads, accommodate shaft deformation and installation deviation, and are widely applied in heavy machinery for mining, metallurgy and building materials.

With the popularization of large-scale heavy industry equipment, the single-unit load of vibrating screens, ball mills and belt conveyors keeps increasing. High vibration occurs during operation, transmission shafts bend under load, and coaxial errors caused by housing machining and assembly cannot be completely eliminated. Bearings without self-aligning function will suffer unbalanced rolling element stress once shaft offset appears, rapidly resulting in raceway pitting and cage fracture. Conventional bearings have limited shock resistance and short service life under alternating impact of ore screening and crushing equipment. Frequent replacement continuously raises operation and maintenance costs. A large number of open-pit mining machines work in dusty surroundings. Fine particles easily penetrate into bearings, degrade grease and accelerate wear on rolling contact surfaces. Equipment manufacturers and mining enterprises urgently demand heavy-duty roller bearings integrating self-aligning capability, ultra-high load capacity, shock resistance and dust adaptability. Featuring double-row spherical roller structure, NMT Spherical Roller Bearings enable angle compensation for inner and outer rings, effectively offsetting negative effects caused by shaft deflection and assembly misalignment. Two rows of rollers bear loads jointly to resist continuous heavy loads and intermittent impact, perfectly matching complex force conditions of all kinds of heavy construction machinery.

Designed with optimized double-row symmetric spherical rollers, NMT Spherical Roller Bearings have spherical inner raceways on outer rings to achieve outstanding self-aligning performance. A certain degree of shaft inclination is permitted to avoid uneven roller abrasion induced by shaft bending and misalignment. Precision forged rollers have super-finished contact surfaces with optimized profile design for even stress distribution and improved anti-fatigue load limit. Multiple cage versions are available: brass cages feature better heat dissipation for high-temperature continuous operation, while stamped steel cages adopt compact structure for lightweight installation. The bearings are engineered to bear relatively large radial loads and bidirectional axial composite loads, resisting alternating stress generated during equipment startup, shutdown and material impact. Multiple sealing options are provided. Open-type bearings facilitate on-site grease replenishment; contact and non-contact sealed models prevent dust and gravel from entering bearing cavities, adapting to dusty environments in mines and sand plants. Widely used in vibrating screening machines, ball mills, rotary kilns, large belt pulleys, crushers, metallurgical roller tables, excavator transmission mechanisms and main equipment of cement production lines.

Inner rings, outer rings and rolling rollers are made of high-purity carburizing bearing steel via precision forging and deep heat treatment. Sufficient surface hardness and good core toughness help resist impact loads and prevent cracking. Superfinishing is carried out on raceways and rollers to lower friction coefficient and temperature rise. Precisely machined cages separate each row of rollers to avoid collision and mutual friction. All finished products pass dimensional inspection, radial clearance sorting and rotation testing. Models dedicated for vibrating screens receive additional simulated vibration durability tests. Products with abnormal clearance and abnormal noise are eliminated to guarantee stable operation among batches.

The complete specification range covers standard clearance, C3 and C4 large clearance types including open and sealed versions, supplying reliable self-aligning bearing solutions for heavy-load and high-vibration working conditions in mining and heavy industry.

Core Product Advantages

Spherical raceway self-aligning structure allows moderate shaft inclination and solves uneven wear caused by shaft deflection and assembly misalignment;

Double-row spherical roller load-bearing structure withstands enormous radial loads and bidirectional axial loads simultaneously with remarkable composite load capacity;

Material balances high hardness and toughness, delivering shock resistance for alternating loads in vibrating screens and crushers;

Multiple cage alternatives: brass cages resist high temperature while steel cages offer cost advantages to satisfy diverse design requirements;

Standard, C3 and C4 enlarged clearance specifications adapt to shaft thermal expansion under heavy load and prevent bearing seizure;

Optional open structure and various sealing types. Sealed bearings effectively block dust and gravel to extend service life in harsh environments;

Super-finished rolling contact surfaces reduce friction and temperature rise, lowering grease failure risk;

Standard overall dimensions in line with universal industrial specifications. Direct replacement without modification of bearing housings.

Typical Application Scenarios

Mining stone vibrating screens and sand crushers; ball mills, rotary kilns and conveying roller tables in metallurgical industry; large pulleys and drying equipment in cement plants; heavy belt conveyor pulleys for ports and mines; transmission parts of excavators and loaders in construction machinery; large drying equipment for papermaking and chemical industry; heavy supporting positions of large fans and gearboxes.

Quality Assurance

NMT Spherical Roller Bearings adopt high-purity bearing alloy steel raw materials. Sampling tests on metallographic structure and hardness are conducted after material arrival to strictly control impurity content. Inner rings, outer rings and rollers go through precision forging to eliminate internal material defects. Special heat treatment achieves surface wear resistance and core shock resistance. Super grinding is applied on raceways and rolling bodies to reduce surface roughness and delay fatigue pitting. Brass or high-quality steel plates are precisely processed into cages according to working conditions with tight tolerance control. Every finished bearing passes dimensional verification, clearance grouping and noise inspection. Additional impact durability simulation tests are arranged for products used under heavy vibration conditions. Defective goods are sorted separately. Each spherical roller bearing ensures flexible self-alignment, stable load capacity and qualified vibration resistance, providing long-term reliable support for heavy equipment in mining, metallurgy and building material industries.

Product Range

Open spherical roller bearings, contact sealed spherical roller bearings, non-contact dust-proof spherical roller bearings; including standard clearance, C3 clearance and C4 large clearance specifications. Model selection based on load magnitude, vibration intensity, dust level and operating temperature.

Brand Strength

NMT focuses on R&D and manufacturing of heavy-duty roller bearings. Targeting long-term high vibration and impact load conditions of mining vibrating equipment and metallurgical mills, NMT continuously optimizes roller profile design, heat treatment technology and clearance matching scheme. The bearings effectively reduce frequent failures such as uneven roller wear, early fatigue peeling and high-temperature seizure. NMT helps heavy industry enterprises prolong bearing replacement cycles and significantly cut downtime maintenance costs of heavy machinery.