Tapered roller bearings adopt matched tapered roller and raceway structure to withstand huge radial load and unidirectional axial thrust simultaneously, with much higher load capacity and impact resistance than ball bearings. Consisting of separable inner assembly and outer ring, the axial preload clearance can be flexibly adjusted during installation. They serve as core heavy-load support bearings for truck axles, differentials, loaders, excavators, gear reducers and mine conveying equipment. Products include single-row, double-row and four-row structures: single-row for automobile wheel hubs and differentials, double-row and four-row for extra-heavy load conditions of mines and large reducers.

Compared with cylindrical roller bearings, tapered roller bearings integrate radial load bearing and axial thrust restraint, eliminating the need for additional thrust bearings to simplify transmission structure. Against deep groove and angular contact ball bearings, the line-contact roller structure delivers outstanding performance in heavy load resistance and bump impact absorption. The limitation lies in low limiting rotational speed, which makes them unsuitable for high-speed spindles, focusing on low-speed heavy-load, alternating impact and axially stressed transmission components.

Axles of heavy-duty trucks and light commercial vehicles, traveling mechanisms of construction machinery operate under bumpy, gravel and muddy harsh conditions with large start-stop impact load and fluctuating axial force. Inferior tapered roller bearings suffer from inconsistent roller taper, thin hardened raceway layer and rigid insufficient cages, resulting in roller pitting, raceway spalling, cage fracture and abnormal clearance expansion after long service. These failures cause loose vehicle wheel hubs, abnormal rear axle noise, gear tooth breakage of reducers and traveling jamming of construction machinery, bringing high vehicle overhaul cost and severe construction shutdown losses.

NMT tapered roller bearings cover full series of 302, 320, 322, 329, 32900, 35000 and four-row tapered roller bearings with complete single-row, double-row and four-row structures. Modular separable inner and outer rings support flexible preload adjustment. Stamped steel cages and solid brass cages are optional for normal load and heavy impact working conditions respectively. Bearings adopt carburized bearing steel with integral carburizing quenching to strengthen surface wear resistance. International standard dimensions enable direct replacement of original tapered roller bearings for mainstream vehicle manufacturers and construction machinery.

Commercial vehicles and construction machinery are upgraded toward large tonnage and high-intensity operation. Conventional tapered roller bearings have thin wear-resistant layers and poor impact resistance, suffering rapid wear after lubrication failure in muddy water and dust, failing to meet long-term high-intensity operation of heavy trucks and continuous operation of mine equipment. The market demands heavy-duty tapered roller bearings with thick hardened layers, strong impact resistance and long wear life.

NMT adopts integrated precision grinding for tapered rollers to unify roller taper and end face dimension within micron tolerance, ensuring even force distribution on all rollers to avoid overload damage of single roller. Inner and outer raceways are processed by deep carburizing quenching to form sufficient effective hardened layer against abrasive wear and impact spalling from gravel. High-strength stamped steel cages fit regular vehicle vibration conditions, while solid brass cages are applied for extreme impact scenarios of mines and heavy reducers to prevent cage tearing and disintegration. Bearing contour dimensions strictly match original parts, so axial clearance can be precisely set by adjusting gaskets during axle and reducer assembly without mechanical modification.

Edge fillets of raceways are optimized for vehicle wheel hubs and rear axle differentials to reduce stress concentration. Large four-row tapered roller bearings adopt extended effective roller length to boost overall dynamic load rating for heavy support of vertical mills and rolling mills. All finished bearings pass load fatigue test, taper coaxiality inspection and clearance grouping screening to eliminate defective products with taper deviation, insufficient hardened layer and unbalanced assembly clearance, maintaining stable structural performance under long-term heavy-load operation.

Core Product Advantages

Tapered roller line-contact structure realizes dual heavy-load bearing for radial load and unidirectional axial load with built-in axial limit to simplify transmission assembly.

Deep carburizing quenched raceways and rollers with thick hardened layers improve wear and spalling resistance, doubling service life in muddy and dusty harsh environments.

Two cage options: cost-effective steel cages for mass-produced vehicles, brass cages for extreme impact resistance against fracture.

Separable inner and outer ring design supports flexible on-site adjustment of bearing preload clearance for assembly calibration of axles and differentials.

Precision paired and ground rollers achieve uniform stress to prevent catastrophic failure from single roller overload.

Full product coverage from single-row to four-row bearings, covering light truck wheel hubs to heavy-load support of large mine rolling mills.

Original standard overall dimensions realize non-destructive replacement of original vehicle bearings without adaptation work for equipment maintenance and renovation.

Strict factory fatigue load inspection minimizes unexpected breakdowns of heavy-load equipment.

Typical Application Scenarios

Wheel hub bearings, rear axle differentials and transmission shaft supports for heavy trucks, light trucks and pickups; traveling wheels and hinge joints of loaders, excavators and bulldozers; transmission supports of planetary gear reducers, hard-tooth reducers and winches; four-row heavy-load supports for mine belt conveyors, vertical mills and steel rolling equipment; rear axles of agricultural tractors and bearing positions of hydraulic motors for large construction machinery.

Quality Assurance

NMT implements exclusive process control for heavy-duty tapered roller bearings: high-temperature normalizing after forging of bearing steel blanks to refine grain structure; deep carburizing quenching and low-temperature tempering for inner rings, outer rings and rollers to stabilize internal stress; full-line precision through grinding for tapered rollers with taper consistency verification; impact strength pressure test for cages; clearance grouping for finished bearings according to working conditions, and additional bench impact durability test for heavy-duty models. Delivered bearings feature uniform hardness and sufficient structural toughness to bear continuous heavy pressure and buffer instantaneous impact from road surfaces and construction operations, guaranteeing stable operation of vehicles and engineering machinery.

Product Range

Single-row tapered roller bearings of 30200, 32000, 32200, 32900, 33000, 35000 series; double-row and four-row tapered roller bearings; stamped steel cages, solid brass cages; standard clearance and enlarged heavy-duty clearance models.

Brand Strength

NMT focuses on R&D of heavy-duty transmission bearings, targeting common failures including abnormal noise and excessive clearance of axle bearings, impact fracture of construction machinery bearings and early spalling of reducer bearings. Upgrades of deep carburizing heat treatment, precision taper grinding of rollers and high-strength cage structure greatly enhance three core performances: wear resistance, impact resistance and fatigue resistance. It helps commercial vehicle repair factories and construction machinery maintenance providers cut bearing replacement frequency and reduce operational losses caused by vehicle and engineering equipment shutdown.