Heavy-duty rotating equipment such as industrial robot joints, machine tool spindles, construction machinery drive axles, large reducers, metallurgical rolling mills and automotive transmissions are subjected to large radial loads and axial loads simultaneously during operation, forming combined load conditions. The equipment demands high rigidity, rotational accuracy and impact resistance from bearings. Ordinary cylindrical roller bearings can only withstand radial loads, requiring additional thrust bearings to handle axial forces, which increases axial dimensions and structural complexity. While angular contact ball bearings can handle combined loads, their load capacity is insufficient under heavy-duty conditions.

Most heavy-duty equipment requires long-term continuous operation, placing extremely high demands on bearing life and reliability. Minor differences in internal clearance and preload are amplified into vibration and temperature rise under load, directly affecting machining quality and equipment life. Frequent start-stop cycles accompanied by impact loads require bearings with high impact resistance and stable rotational accuracy. The industry urgently requires bearings that can simultaneously withstand radial and axial combined loads, provide high rigidity and long life, and adapt to impact and vibration conditions.

NMT Tapered Roller Bearings employ tapered rollers and conical raceway structures, with line contact between rollers and raceways, capable of simultaneously withstanding radial loads and unidirectional axial loads. Roller generatrices feature optimized logarithmic crowning to eliminate edge stress concentration, ensuring uniform load distribution along the full roller length. Bearings are available in multiple contact angles and structural types——single row, double row, four-row——adapting to different load directions and magnitudes. Separable inner and outer rings enable convenient installation and maintenance. Cages are manufactured from high-strength copper alloy or steel, adapting to grease lubrication, oil bath lubrication and oil-mist lubrication methods.

Rollers are precision-machined from high-purity bearing alloy steel, subject to strict micron-level dimensional sorting, with surfaces superfinished for low friction coefficient. Shaft washers and housing washers undergo forging, precision grinding and superfinishing. All components receive carburizing quenching heat treatment and long-term low-temperature stabilization processing to achieve sufficient surface hardness with core toughness, balancing wear resistance and impact resistance. High-precision solid cages accurately separate each roller to prevent mutual collision and tilting, reserving sufficient lubrication space to extend maintenance intervals. Products are available in P5 and P4 precision grades, suited to different speed and accuracy requirements.

Products adopt international standard dimensions with excellent interchangeability. Comprehensive specifications cover bore diameters from 15mm to over 600mm, widely applied to industrial robot joints, machine tool spindles, construction machinery drive axles, large reducers, metallurgical rolling mills, automotive transmissions and various heavy-duty rotating equipment. The bearings adapt to continuous high-speed operation, frequent start-stop, impact loads and vibration coexistence conditions.

Core Product Advantages

1. Tapered roller and conical raceway line contact structure simultaneously withstands radial loads and unidirectional axial loads, ideally suited for combined load conditions;

2. Logarithmic crowning on roller generatrices eliminates edge stress concentration for uniform load distribution along the full roller length with high load efficiency;

3. Multiple contact angles and structural types available (single row, double row, four-row) for flexible adaptation to different load directions and magnitudes;

4. Separable inner and outer rings enable convenient installation and maintenance, reducing assembly difficulty;

5. Precision carburizing quenching heat treatment across all components provides high surface hardness with good core toughness, resisting wear and impact;

6. Superfinished raceways matched with graded rollers deliver low friction torque and minimal temperature rise for long-term continuous high-speed operation;

7. High-precision cages accurately guide roller motion for smooth, reliable operation and extended bearing service life;

8. P5 and P4 precision grades available for different speed and accuracy requirements;

9. Standard external dimensions ensure great interchangeability to replace imported counterparts and lower procurement costs.

Typical Application Scenarios

Industrial robot joints and reducers; machine tool spindles (lathes, milling machines, grinding machines); construction machinery drive axles, wheel hubs and steering knuckles; large reducers and gearboxes; metallurgical rolling mill work rolls and backup rolls; automotive transmissions and differentials; wind turbine gearbox main shafts; mining machinery and crushing equipment.

Quality Assurance

NMT Tapered Roller Bearings are manufactured with premium refined bearing alloy steel. Incoming inspection includes chemical composition testing and metallurgical sampling inspection to eliminate material defects at source. Roller blanks are processed by precision rolling and cutting, followed by sequential rough grinding, finish grinding and superfinishing with strict control over roller profile precision, crowning parameters and surface roughness. Stress relief annealing is conducted after rough machining of shaft washer and housing washer forgings to eliminate internal stress, followed by carburizing quenching and low-temperature stabilization treatment to reduce dimensional variation risks under long-term heavy loads.

All rollers pass flaw detection screening to remove parts with cracks and dents. All components go through high-pressure cleaning and dust-free drying before assembly in clean workshops. Appropriate grease is filled according to practical operating conditions and lubrication methods. After assembly, finished bearings undergo combined load endurance testing, impact load inspection, rotational accuracy inspection and temperature rise testing. All unqualified products are eliminated completely to guarantee stable and consistent performance of bulk goods and supply reliable combined load bearing solutions for heavy-duty rotating equipment.

Product Range

Tapered roller bearing standard series (single row 30000 type, double row 350000 type, four-row 380000 type); Inch series; P5, P4 precision grades; Copper alloy and steel cage options.

Brand Strength

NMT focuses on R&D and manufacturing of precision tapered roller bearings. Targeting common industry challenges of combined loads, high rigidity requirements, impact conditions and precision retention in industrial robots, machine tool spindles, construction machinery and metallurgical equipment, NMT continuously optimizes roller crowning, contact angle and carburizing heat treatment technology. The bearings effectively solve common defects of ordinary bearings such as insufficient combined load capacity, abnormal roller end face wear and severe high-speed heat generation. NMT products reduce risks of bearing failure on heavy-duty equipment, improve long-term operational stability and reliability, and support stable continuous operation of various heavy-duty rotating devices.