Spherical roller bearings adopt a classic structure of double-row barrel spherical rollers and outer ring spherical raceways, featuring excellent self-aligning performance to compensate angular deflection caused by shaft deflection, base deformation and misaligned installation. Meanwhile, the line contact of rollers bears ultra-heavy radial load, and it can withstand bidirectional axial force and alternating impact load. It is the core support bearing for equipment with heavy load, poor centering and severe vibration. Product types include CA solid brass cage, CC stamped steel cage and C reinforced roller structure, mainly divided into three major series: 22200 medium general type, 22300 wide-section heavy-load type and 23200 wide-bore dual-load main type. Two structural types: open type for oil lubrication and sealed dust-proof type, suitable for low-speed heavy-load and medium-speed fan working conditions. Widely applied to mine ball mills, cement rotary kilns, large centrifugal induced draft fans, crushers, bucket elevators, long-distance belt conveyors, paper press rolls and metallurgical roll supports. Core strengths are strong self-aligning fault tolerance, heavy-load vibration resistance, anti-seize performance under eccentric load and long service life for continuous operation.

Main model classification: 22200 medium general self-aligning series, 22300 widened cross-section ultimate heavy-load series, 23200 wide double-row composite load-bearing series; Precision grades: P0 general heavy industry grade, P6 precision transmission grade for fans; Clearance: C0 standard clearance, C3 enlarged clearance for high-temperature fans, C4 super-large clearance for mine impact heavy load.

Performance comparison: Compared with tapered roller bearings, it has spherical self-aligning function to avoid seizure failure under shaft tilt, yet weak unidirectional axial limiting capacity, unsuitable for high-strength axial positioning. Compared with cylindrical roller bearings, it perfectly adapts to shaft bending deformation with greatly improved installation fault tolerance and slightly lower limiting speed. Compared with deep groove ball bearings, load capacity increases dozens of times with strong impact resistance, unable to realize high-speed silent operation. Shortcoming: High heat generation under high-speed operation relying on circulating oil for heat dissipation; oversized structure incompatible with small compact equipment.

Mining, cement and large fan equipment operate under harsh conditions including foundation settlement, main shaft bending, material impact vibration, high-temperature hot air, dust & mud intrusion and alternating start-stop load. Inferior spherical roller bearings have inaccurate spherical radian of outer ring raceway leading to self-aligning failure. Slight shaft deflection causes concentrated stress and edge fragmentation of rollers. Uneven quenching hardness of rollers leads to large-area pitting spalling under vibration impact. Insufficient structural strength of cages causes tearing and collapse under heavy centrifugal force, resulting in direct bearing seizure and shaft locking. It triggers shutdown maintenance of ball mills, cylinder offset of rotary kilns and main shaft sweeping fracture of fans, leading to production line shutdown and huge shutdown losses.

NMT spherical roller bearings cover all mainstream series of 22200, 22300 and 23200, with sufficient stock for CC economical industrial bearings, CA brass-cage high-temperature fan bearings and C-type reinforced mine heavy-load bearings. Made of high-purity carburized bearing steel, the outer ring spherical surface is integrally precision turning & grinding with unified standard spherical radian to compensate shaft angular deviation of 1°~1.5° at maximum and eliminate eccentric edge stress. Optimized profile modification on barrel roller distributes load evenly along roller length to restrain stress concentration edge chipping. Two cage types for selective matching: CC steel cage for cost-effective supporting of mine conveyors and crushers, CA integral machined brass cage with high temperature resistance and anti-grease carbonization for long-term continuous operation of cement kilns and high-temperature main fans. C3/C4 large-clearance models are specially designed for high-temperature expansion and impact vibration to prevent thermal seizure. Dynamic & static balance screening before delivery meets dynamic balance assembly requirements of fan main shafts.

Heavy industrial crushing, calcination and ventilation conveying equipment are upgraded toward long-cycle maintenance-free overhaul, self-adaptation to base deformation and long-term durability under high temperature & dust. Low-grade spherical roller bearings suffer from poor spherical precision, insufficient roller toughness and fragile cages, resulting in abnormal noise, excessive clearance and bearing seizure after several months of operation and frequent production line shutdown maintenance. The market is in urgent need of heavy-duty spherical roller bearings with high-precision spherical raceways, profile-modified rollers and high-strength cages.

NMT realizes adaptive self-aligning correction, heavy-load vibration resistance durability and stable operation under high-temperature & dust conditions via three core processes: precision forming & grinding of outer ring spherical surface, end profile modification for noise reduction of barrel rollers and structural reinforcement of high-strength cages. Finished bearings pass self-aligning angle performance inspection, impact fatigue durability test, high-temperature temperature rise test and full-size sorting inspection to eliminate defective products with poor spherical radian, roller hardness defects and insufficient cage strength. It guarantees uninterrupted production of core main units for mines, cement plants and large fans, cutting shutdown losses and spare parts replacement costs.

Core Product Advantages

Outer ring spherical raceway + double-row barrel rollers automatically compensate main shaft bending, frame deformation and installation eccentricity to eliminate eccentric load seizure.

Ultra-large radial load capacity + bidirectional axial load capacity to cope with composite loads including ore impact, cylinder self-weight and fan axial wind pressure.

Arc modification on roller ends eliminates edge stress to prevent roller corner breakage under vibration & bump conditions.

Differentiated selection of two cages: cost-effective steel cage for general industrial & mining use, high-temperature & impact-resistant brass cage for kiln and high-temperature fans.

Optional C3/C4 enlarged clearance prevents bearing seizure adapting to high-temperature thermal expansion of fans and heavy-load deformation of mines.

Deep-quenched bearing steel improves fatigue spalling resistance of raceways and rollers for wear resistance under harsh environments such as dust, coal ash and cement dust.

Two styles including open type for oil lubrication and double-sided dust-proof sealed type adapt to oil bath lubrication of rotary kilns and grease lubrication of fans.

Standard national standard mounting dimensions realize equipment replacement without base modification for efficient maintenance & replacement.

Typical Application Scenarios

Main shaft support bearings for mine horizontal ball mills, vertical crushers, cone crushers and jaw crushers; Bearings for cement rotary kilns, grate coolers, bucket elevators and vertical cement mill rollers; Large main shaft bearings for boiler induced draft fans, primary air fans and sintering main exhaust fans in power plants; Support bearings for long-distance mine belt conveyors and drums; Bearings for metallurgical sintering machines and mill roller tables; Support bearings for large paper press rolls and drying rolls; Slewing bearings for large port stacker-reclaimers.

Quality Assurance

NMT spherical roller bearings adopt vacuum-refined bearing steel with deep quenching, featuring high surface hardness for wear resistance and strong core toughness against impact fracture. Compatible with circulating engine oil lubrication and high-temperature extreme-pressure grease, operating temperature ranges from -45℃ to 140℃, adapting to harsh heavy industry conditions such as low-temperature startup in winter, continuous high temperature of kilns, heavy dust, mud immersion and continuous vibration.

Product Range

22200 medium general self-aligning series, 22300 widened ultimate heavy-load series, 23200 wide composite load-bearing series; Structure: double-row barrel spherical roller self-aligning structure; Precision grades: P0 general heavy industry grade, P6 precision grade for fan main shafts; Clearance: C0 standard clearance, C3 high-temperature enlarged clearance, C4 super-large clearance for impact heavy load; Sealing: open type (oil lubrication), double-sided dust-proof sealed type; Cages: CC stamped steel cage, CA integral solid brass cage, C-type reinforced roller structure.

Brand Strength

NMT Japan solves three major pain points of ordinary spherical roller bearings: self-aligning failure & roller edge breakage after shaft deflection, cage damage under high temperature and rapid raceway pitting damage under vibration. Core technologies including precision grinding of outer ring spherical surface, roller profile optimization and heavy-load cage reinforcement develop special heavy-duty spherical roller bearings for mines, cement plants and large fans. We supply bearings for mine equipment manufacturers, cement complete set equipment enterprises, fan manufacturers, heavy industry parts distributors and industrial & mining maintenance service providers to ensure continuous production of heavy industry main units, extend bearing overhaul & replacement cycle and reduce comprehensive operation & maintenance costs of factories.