Spherical roller bearings adopt a double-row symmetrical convex roller structure with spherical outer ring raceway, delivering excellent self-aligning capacity to compensate shaft bending deformation, bearing housing misalignment and assembly concentricity errors. They can withstand ultra-heavy radial load and bidirectional alternating axial load with outstanding shock resistance, vibration resistance and dust adaptability. Available in open type, type with oil groove & hole and reinforced sealed type, equipped with machined solid copper cages or stamped steel cages. Compatible with long-term grease lubrication and circulating oil lubrication, they serve as core bearings for harsh eccentric vibration conditions such as mine crushing, vibrating screening, vertical mills and large conveying equipment.

Main model classification: 22200 medium general heavy-duty series, 22300 extra thick reinforced heavy-duty series, 23000 wide low-section heavy-duty series, 23100 medium thin-wall heavy-duty series, 240/241 large heavy-duty series. Structural options: lubrication type with oil hole & groove, standard open type, 2RS double-sided dust-proof sealed type. Precision grades: P0 general industrial grade, P6 precision transmission grade, P5 high-precision mill special grade. Clearance groups: C0 standard clearance, C3 increased clearance (standard for vibrating equipment), C4 extra-large clearance.

Performance comparison: Compared with cylindrical roller bearings, the exclusive self-aligning function prevents bearing seizure caused by shaft deformation and base dislocation for vibrating equipment. Compared with tapered roller bearings, it bears bidirectional axial force without paired reverse assembly to simplify installation. Compared with deep groove ball bearings, load capacity increases more than tenfold to adapt to heavy impact loads. Shortcoming: Low limiting rotational speed, not applicable for high-speed spindle applications. Spherical raceway requires high-precision machining; inferior products suffer from rapid roller eccentric wear and spalling easily.

Jaw crushers, cone crushers, linear vibrating screens, circular vibrating screens, vertical cement mills, mine bucket elevators and sintering machine drums operate under harsh conditions of high-frequency vibration, material impact, dust intrusion, shaft deformation eccentric load and drastic temperature difference all year round. Inferior spherical roller bearings have insufficient spherical curvature precision leading to self-aligning failure and overload fracture of single-side rollers. Uneven roller heat treatment causes surface pitting and peeling under vibration fatigue. Thin cage structure breaks and disintegrates under continuous resonance. Simple sealing structure allows dust abrasion on raceways to form grooves, directly triggering abnormal vibration of crusher body, seizure shutdown of vibrating screens, roller swing eccentric wear of vertical mills and shaft breakage of elevators. The maintenance cost of mine production line shutdown is extremely high.

NMT spherical roller bearings cover full specifications of 222, 223, 230, 231, 240 and 241 series. C3 and C4 large-clearance models for vibrating machinery are in sufficient stock, and models with oil injection holes & grooves support refueling maintenance without shutdown. Manufactured from ultra-high purity electroslag remelting bearing steel with overall quenching and tempering plus deep surface quenching on raceways. CNC precision grinding for spherical raceways ensures smooth wide-angle self-alignment without jamming. Full crown crowning modification on convex rollers disperses peak edge stress to counteract alternating eccentric load from vibration. Solid copper cages feature high rigidity to resist fatigue fracture under continuous resonance, while stamped cages are for cost-effective industrial scenarios. Sealed versions adopt thickened double-lip dust-resistant rubber seals to isolate ore sand impurities together with lubricating grease. All dimensions comply with national standards for direct replacement of domestic and imported bearings of the same model during maintenance of mining equipment, cement mills and conveying equipment without machining modification of bearing housings.

Heavy-duty equipment for mining crushing, building material grinding and vibrating screening & conveying is upgraded toward long-term vibration resistance, assembly fault tolerance, low maintenance frequency and durability in dusty environments. Ordinary low-grade spherical roller bearings have rough spherical machining, unoptimized roller stress relief and mismatched clearance, resulting in early roller spalling, cage fracture and raceway abrasion failure under vibration conditions. They cannot meet the demands of 24-hour non-stop vibration operation of mines and heavy-load deformation working conditions of mills. The market urgently needs heavy-duty spherical roller bearings with high self-aligning precision, vibration fatigue resistance and large clearance customized for vibrating equipment.

NMT achieves adaptive misalignment self-alignment, uniform vibration load distribution and long-term dust-proof lubrication via three core processes: precision forming of spherical raceways, roller crown optimization and customized large clearance matching. All finished bearings pass spherical fitting inspection, clearance classification screening and fatigue vibration simulation test to eliminate defective products with curvature deviation, heat treatment defects and poor assembly. It buffers stress from shaft deformation, resists dust abrasion and greatly extends bearing service life under harsh working conditions.

Core Product Advantages

Double-row convex roller + spherical outer ring realizes wide-range self-alignment to compensate shaft bending and base assembly dislocation and avoid seizure from eccentric load.

Bear ultra-heavy radial load + bidirectional axial load simultaneously with excellent resistance to impact and alternating load.

Optional C3/C4 increased clearance specially customized for high-frequency vibration of vibrating screens and crushers to eliminate jamming caused by thermal expansion.

Roller crown crowning process equalizes stress under vibration eccentric load to prevent end pitting and fracture.

Integral copper cage resists resonance fatigue and avoids fracture & disintegration during long-term vibration operation.

Optional structure with oil groove & hole allows direct grease refueling during operation without full equipment shutdown for maintenance.

Thickened double-lip sealed models block intrusion of mine dust and moisture into raceways for open-pit dusty mining environments.

Standard overall dimensions enable universal interchangeability for convenient renovation and parts replacement of old mining equipment.

Typical Application Scenarios

Main shaft support bearings for mining crushers such as jaw crushers, cone crushers and hammer crushers; exciter bearings for linear vibrating screens, circular vibrating screens and dewatering screens; end cover support bearings for vertical cement roller mills, slag vertical mills and ball mills; bearings for mine bucket elevators, scraper conveyors and sintering machine drums; heavy-duty bearings for aggregate production line drums, ore washers and rotary kiln support rollers; floating-end heavy-load bearings for large fan bases and industrial reducers.

Quality Assurance

NMT spherical roller bearings are made of electroslag remelting bearing steel to reduce internal inclusions and improve fatigue life. Precision grinding of spherical raceways ensures flexible self-alignment. Deep quenched raceways deliver wear resistance and impact resistance. Compatible with extreme pressure lithium grease and industrial gear oil lubrication, operating temperature ranges from -25℃ to 145℃, adapting to complex working conditions including open-pit mine dust, high-temperature oil bath of mills and continuous resonance of vibrating equipment.

Product Range

222 series medium spherical roller bearings, 223 series heavy-duty reinforced type, 230/231 thin-wall wide type, 240/241 large heavy-duty spherical roller bearings; Structures: open type, with oil injection hole, 2RS sealed type; Clearance: C0 standard, C3 vibration-specific, C4 extra-large clearance; Precision grades: P0 industrial grade, P6 precision grade, P5 high-precision mill grade.

Brand Strength

NMT Japan solves three major pain points of conventional spherical roller bearings: eccentric load damage from failed self-alignment, cage fracture under long-term vibration and rapid abrasion caused by dust intrusion. Core technologies including precision spherical machining, roller stress crowning and vibration-specific clearance matching deliver heavy-duty spherical roller bearings with high fault tolerance, outstanding vibration resistance and long service life. We supply bearings for mining machinery manufacturers, cement & building material enterprises, vibrating equipment makers and industrial equipment maintenance service providers to stabilize continuous operation of crushing, screening and grinding production lines, reduce unexpected shutdown failures and cut costs of parts replacement and production loss for industrial and mining enterprises.