Spherical roller bearings are core load-bearing bearings for heavy industrial equipment. Adopting the classic structure of double-row spherical rollers and outer ring spherical raceway, they possess five core advantages: active self-aligning compensation, ultra-large radial load capacity, bidirectional axial impact load resistance, eccentricity deformation resistance and excellent adaptability to dusty harsh environments. When spindle deflection, misalignment installation, base settlement displacement or shaft eccentric deflection occur, the bearing actively adapts to angle deviation to avoid roller jamming, concentrated edge stress and local ablation damage, which is irreplaceable for heavy-load fault-tolerant applications compared with cylindrical roller bearings and tapered roller bearings.

NMT spherical roller bearings boast a comprehensive product lineup, covering 22200 medium heavy-duty series, 22300 heavy reinforced series, 23000 thin-wall heavy-duty series and 23100 wide-load series, equipped with mainstream cage structures including CA, CC, CK, CAME4 and CCK/W33. Structural types include open bare bearings, W33 type with annular oil groove and lubrication hole, and sealed dust-proof versions. Clearance options consist of C0 standard clearance, C3 large clearance and C4 extra-large clearance to match normal-temperature static load, alternating vibration impact, high-temperature thermal expansion and open dusty working conditions. The double-row roller structure disperses force evenly for outstanding ultimate bearing capacity and strong vibration & impact resistance.

Performance advantages in working condition comparison: Compared with cylindrical roller bearings, built-in self-aligning capacity tolerates large coaxial installation errors, preventing bearing damage caused by frame deformation; compared with tapered roller bearings, radial load capacity is doubled for independent composite impact load bearing without paired installation; compared with deep groove ball bearings, rated load is multiplied to fully satisfy heavy-duty industrial demands. For continuous alternating vibration equipment such as vibrating screens and crushers, the self-aligning structure buffers vibration stress and greatly extends bearing service life.

Mining, metallurgy, cement, thermal power and port heavy machinery operate continuously under harsh conditions including gravel dust, persistent impact vibration, heavy static load, poor heat dissipation and poor installation concentricity. Inferior spherical roller bearings suffer from defective spherical raceway precision, mismatched roller curvature, low-strength cages, insufficient steel toughness and thin hardened layers. Operation failures such as roller fragmentation, raceway spalling pitting, cage fracture and bearing seizure frequently happen. Once heavy-duty bearing failure occurs, complete machine disassembly and maintenance bring high costs and full production line shutdown leading to massive economic losses.

NMT spherical roller bearings are manufactured with high-hardenability chromium-molybdenum alloy bearing steel. After integral forging, deep carburizing quenching and high-temperature tempering stabilization treatment are conducted to achieve high surface hardness for wear resistance and sufficient core toughness for impact fracture resistance. The outer ring spherical raceway is processed by precision spherical forming grinding for uniform and smooth contour. Double-row symmetrical crowned rollers adopt profile modification with chamfer stress relief at both ends to eliminate edge load concentration. Precise spherical matching provides sufficient self-aligning margin to compensate shaft deflection of 1° to 2°, delivering exceptional fault tolerance.

Diversified cage options cover various scenarios: solid brass cages feature high strength, high temperature resistance and impact resistance for steel rolling mills, high-temperature reducers and continuous impact crushers; stamped steel cages realize lightweight structure and smooth lubrication for vibrating screens, conveyors and fans; nylon cages deliver low friction and silent operation for medium-load low-speed heavy-duty transmission. The W33 outer ring annular oil groove with grease injection hole supports online lubrication replenishment during operation to realize long-term maintenance in dusty environments and prevent grease drying failure. Sealed versions adopt combined skeleton oil seal and dust cover to block coal powder, ore debris and cement dust intrusion to protect internal raceways and rollers.

All finished bearings undergo load pressure testing, self-aligning angle calibration, dynamic-static balance inspection and fatigue durability testing with strict clearance screening for working condition matching. C3 and C4 large-clearance models reserve deformation allowance for high-temperature shaft thermal expansion and vibrating equipment to avoid over-tightening and abnormal heat generation during rotation. Stable temperature rise during continuous 24-hour heavy-load operation effectively reduces raceway fatigue spalling, satisfying non-stop full-load production of heavy industry equipment.

Heavy industrial equipment develops toward large-scale, heavy-load and long continuous operation cycles. Low-end traditional spherical roller bearings suffer from poor self-aligning accuracy, easy fragmentation, difficult lubrication maintenance and short service life, failing to meet stable production requirements of mining and metallurgy production lines. Leveraging four core technologies including ultra-precision spherical grinding, roller profile optimization, high-strength heat treatment and heavy-duty cage structure, NMT solves typical industry pain points such as heavy-load eccentricity failure, impact fragmentation, dust abrasion and high-temperature premature aging, delivering highly reliable long-life load-bearing bearing solutions for heavy-duty main equipment.

Core Product Advantages

Double-row spherical roller self-aligning structure automatically compensates shaft bending, installation eccentricity and frame deformation to prevent unbalanced load damage.

Ultra-high radial rated load with bidirectional axial impact load bearing capacity for both static heavy load and alternating impact working conditions.

Crowned roller profile modification ensures uniform stress distribution to eliminate edge stress concentration and enhance vibration fatigue resistance.

Multiple cage types (brass, steel plate, nylon) for flexible selection in high-temperature, impact and conventional working conditions.

Optional W33 oil groove and grease nipple enable non-stop grease refueling for convenient maintenance in dusty sites.

Multi-grade clearance selection (C0/C3/C4) adapts to normal temperature, high-temperature thermal expansion and vibrating equipment.

Alloy bearing steel with deep heat treatment achieves surface wear resistance and core impact resistance to avoid fracture and spalling.

Standard national overall dimensions support direct replacement of same-model bearings of major brands without bearing housing modification.

Typical Application Scenarios

Mining machinery: Main shaft bearings for jaw crushers, cone crushers, vibrating screens, ball mills, belt conveyors and bucket elevators;

Metallurgy & steel equipment: Bearings for hot rolling mills, cold rolling mills, continuous casters, roller tables and high-temperature reducers;

Cement building materials: Vertical cement mills, rotary kilns, bucket elevators, cement fans and clinker conveyors;

Thermal power & wind power: Heavy-duty support bearings for large induced draft fans, coal mills and gearboxes;

Port lifting equipment: Bearings for portal cranes, conveyor rollers and heavy winches;

General heavy machinery: Large gear reducers, air compressors, shield machines and heavy-duty water pumps.

Quality Assurance

NMT spherical roller bearings adopt electric furnace refined alloy bearing steel with strictly controlled impurities and dense internal metal structure free of pores and interlayers. Full production procedures include forging, turning, heat treatment, spherical ultra-precision grinding, roller profile finishing, cage assembly, clearance sorting, running-in pre-test and sealing performance inspection to eliminate defective products with out-of-round spherical surfaces, flawed rollers and deformed cages. Applicable operating temperature ranges from -20℃ to 180℃, and high-temperature variants withstand short-term peak temperature up to 200℃. Stable long-term operation is guaranteed under severe conditions including heavy dust, high humidity and impact vibration. The service life is over 50% longer than ordinary domestic heavy-duty bearings, effectively cutting downtime maintenance frequency of heavy industrial equipment.

Product Range

22200 medium heavy-duty series, 22300 heavy-duty series, 23000 thin-wall heavy-duty series, 23100 wide heavy-duty series;

Structural types: Open basic type, W33 lubrication groove type, double-sided sealed dust-proof type;

Cage types: CA brass cage, CC steel plate cage, CK tapered bore, E4 reinforced type;

Clearance grades: C0 standard clearance, C3 large clearance, C4 extra-large clearance;

Applicable conditions: Heavy static load, alternating impact vibration, shaft eccentric deformation, high-temperature operation, open dusty harsh environment.

Brand Strength

NMT Japan specializes in R&D and manufacturing of heavy-duty industrial bearings, focusing on failure pain points of heavy equipment bearings. Structural optimization is conducted to solve common defects including insufficient self-aligning capacity, impact fragmentation, dust abrasion and high-temperature aging. Supported by precision spherical machining, roller mechanical optimization and high-strength heat treatment technology, NMT manufactures high-stability heavy-duty spherical roller bearings. Bulk supply is provided for mining equipment manufacturers, steel mills, cement equipment factories, reducer manufacturers and heavy-duty maintenance service providers to stabilize heavy machinery operation, reduce unexpected shutdown losses and lower bearing replacement consumption costs, safeguarding stable operation of heavy industrial production lines.