Spherical roller bearings are equipped with double-row symmetrical spherical rollers and inner spherical raceways, while the outer ring raceway adopts an arc spherical structure, delivering outstanding self-aligning performance. It can compensate eccentric offset caused by shaft bending deformation, housing machining deviation and assembly coaxiality error, while bearing extremely heavy radial load and small bidirectional axial load, perfectly matching heavy-load conditions with severe equipment vibration, shaft deflection and poor centering. Products are divided into narrow compact type, standard main type and widened heavy-duty type. Lubrication is compatible with oil lubrication and grease lubrication. Sealing types include open type, contact rubber seal and labyrinth dust seal. Three cage types are available: solid machined brass cage, stamped steel cage and resin cage. Brass cages are for continuous high-temperature heavy load, and steel cages serve cost-effective industrial and mining scenarios. Widely applied to mine crushers, large centrifugal fans, ball mills, vertical cement mills, mine belt drums, bucket elevators and metallurgical sintering equipment, the core advantages are strong self-aligning fault tolerance, vibration & impact resistance, supreme radial load capacity and long service life under harsh conditions.

Main model classification: 23000 wide low-section heavy-duty series, 22200 standard general main series, 22300 widened reinforced heavy-duty series; Structural feature: double-row rollers, outer ring spherical self-aligning structure; Precision grades: P0 general industrial & mining grade, P6 precision transmission grade; Clearance groups: C2 small clearance, C0 standard clearance, C3/C4 large clearance (special for vibrating equipment).

Performance comparison: Compared with cylindrical roller bearings, the spherical self-aligning function prevents bearing seizure from shaft deformation and base inclination, greatly improving assembly tolerance. Compared with tapered roller bearings, axial load capacity is weaker, yet vibration and eccentricity resistance are far superior without precise centering assembly. Compared with deep groove ball bearings, the rated radial load is increased by 5~10 times for heavy rotary equipment, with lower limiting speed unsuitable for high-speed spindles. Shortcoming: Limited axial load capacity, cannot act as main axial positioning bearing; high temperature rise during continuous high-speed operation; slight vibration for large-clearance models at low speed.

Mine crushing, cement grinding and industrial fans operate under long-term ore impact vibration, spindle bending deformation, heavy dust accumulation, poor heat dissipation and 24/7 continuous operation. Inferior spherical roller bearings suffer from roller edge overload fracture due to insufficient spherical raceway grinding accuracy under slight shaft eccentricity. Uneven roller heat treatment hardness leads to fatigue pitting and large-area spalling of raceways under high-frequency vibration. Thin stamped steel cages break from long-term vibration fatigue, causing roller scattering and equipment seizure. Simple dust-proof seals allow ore dust intrusion to abrade grease, directly resulting in abnormal vibration of crushers, overheating & unbalance of fan spindles, mill bearing seizure shutdown and drum bore wear damage. The whole production line halts with long maintenance cycle and huge shutdown losses.

NMT spherical roller bearings cover full specifications of 23000, 22200 and 22300 series, with sufficient stock for large-clearance crusher bearings, sealed dust-proof fan bearings and high-temperature brass cage bearings for vertical mills. Made of ESR high-purity bearing steel, inner and outer ring spherical raceways are ultra-precision ground for uniform spherical curvature and even load distribution under eccentric conditions. Spherical rollers adopt integral carburizing quenching for surface wear resistance and core toughness to resist fatigue cracking under alternating vibration. Diversified cages for customized selection: solid brass cage resists high temperature & creep deformation, thickened steel cage withstands vibration fatigue, and engineering plastic cage realizes lightweight & low noise. Factory-configured C3/C4 enlarged clearance adapts to vibrating crusher conditions, and labyrinth+oil seal composite sealing blocks ultra-fine mine powder and gravel intrusion into bearing cavity. Overall dimensions fully comply with national standard industrial & mining bearing dimensions for direct replacement of old equipment without machining.

Heavy-duty rotary equipment for mines, building materials and metallurgy is upgraded toward strong vibration resistance, low assembly requirement, long maintenance-free cycle and stable 24-hour continuous production. Low-grade spherical roller bearings feature poor spherical precision, insufficient roller toughness and weak cage fatigue resistance, leading to early bearing failure and production line low availability shortly after commissioning. The market urgently needs industrial & mining dedicated spherical roller bearings with high-precision spherical grinding, toughened roller heat treatment and working-condition customized clearance & sealing.

NMT realizes eccentric adaptive self-alignment, stable operation under strong vibration and long-term dust protection via three core processes: precision forming grinding of spherical raceways, toughening heat treatment of spherical rollers and working-condition customized clearance matching. Finished bearings pass sphericity inspection, alternating vibration durability test, dust seal aging test and clearance grading verification to eliminate defective products with out-of-round spherical surfaces, roller hardness defects and insufficient cage fatigue strength. It ensures continuous operation of heavy industrial production lines and cuts massive shutdown & accessory costs caused by emergency overhaul, spindle damage and complete machine replacement.

Core Product Advantages

Outer ring spherical self-alignment compensates shaft bending, frame settlement and assembly centering error to eliminate shaft seizure from eccentric overload.

Double-row spherical roller structure delivers extreme radial load capacity for impact heavy load of crushers and mills.

Multiple clearance options: C3/C4 large clearance specially designed for vibrating crushing equipment to avoid seizure from high-temperature expansion.

Three cage types for selection: brass for long-term high-temperature heavy load, steel for cost-effective industrial & mining use, resin for low-noise fans.

Composite dust-proof sealing blocks intrusion of ultra-fine mine dust and cement powder to extend grease replacement cycle.

Toughened integral rollers resist fatigue pitting and roller fracture under long-term high-frequency vibration.

Standard national outline dimensions enable direct replacement for old mine & cement equipment with zero renovation cost.

Compatible with high-low temperature long-life grease to prevent grease liquefaction under high temperature of summer mills and ensure smooth lubrication for outdoor winter equipment.

Typical Application Scenarios

Main shaft support bearings for jaw crushers, cone crushers and hammer crushers; Spindle bearings for industrial induced draft fans, blowers and boiler fans; End cover bearings for cement ball mills, vertical roller mills and mine rod mills; Drive drum and bend pulley bearings for mine belt conveyors; Rotary bearings for bucket elevators and chain bucket conveyors; Rotary support bearings for metallurgical sintering machines and coolers; Support bearings for riding rings and thrust rollers of large rotary kilns.

Quality Assurance

NMT spherical roller bearings adopt deep heat treatment for high-purity bearing steel with high consistency of spherical raceway contour and even roller stress. Compatible with circulating oil lubrication and extreme-pressure long-life grease, operating temperature ranges from -40℃ to 150℃, adapting to harsh complex conditions such as strong vibration & dust in mines, continuous high temperature of cement mills, seasonal temperature difference of outdoor fans and high-temperature radiation of metallurgical equipment.

Product Range

23000 low-section wide heavy-duty series, 22200 standard general series, 22300 widened reinforced heavy-duty series; Structure: double-row spherical roller self-aligning; Precision grades: P0 industrial heavy-duty grade, P6 precision transmission grade; Clearance: C2, C0 standard, C3, C4 large clearance for vibration equipment; Sealing: open type, contact rubber seal, labyrinth composite dust seal; Cages: machined brass cage, stamped steel cage, nylon resin cage.

Brand Strength

NMT Japan solves three major pain points of ordinary spherical roller bearings: roller damage from eccentric overload, cage fracture under long-term vibration and premature scrapping due to lubrication failure from dust intrusion. Core technologies including precision spherical grinding, roller toughening heat treatment and working-condition customized clearance & sealing design develop dedicated spherical roller bearings for heavy-duty equipment in mines, building materials and metallurgy. We supply bearings for crushing equipment manufacturers, fan manufacturers, cement & mine maintenance service providers and metallurgical equipment enterprises to stabilize operation of heavy-duty equipment, extend bearing replacement cycle and avoid revenue losses from unexpected production line shutdown.