Industrial drive motors, precision machine tool spindles, high-speed gearboxes, rail transit traction equipment and large fan spindles mainly bear heavy radial loads during operation, with minor axial force in partial working conditions, requiring bearings to deliver strong radial capacity, stable rotational precision and high limiting speed. Deep groove ball bearings have limited radial load capacity and cannot meet demands of heavy-duty continuous operation. Tapered roller bearings generate relatively high friction and are not suitable for applications pursuing high speed and low heat generation. Cylindrical roller bearings adopt parallel rollers and linear raceways. Line contact between rollers and raceways provides outstanding radial load capacity and relatively high limiting speed. Multiple structural variants adapt to different axial positioning requirements. NU and N types without integral ribs allow proper axial displacement of shafts to compensate thermal elongation caused by temperature rise. NJ, NF and NUP types equipped with ribs can sustain certain unidirectional axial loads. Working conditions vary greatly across industries. Machine tool workshops demand high precision and low vibration; rail transit equipment endures long-term continuous shock and vibration; fans operate nonstop all year round. Dust, temperature fluctuation and lubricant deterioration continuously shorten bearing service life. NMT Cylindrical Roller Bearings feature complete model portfolio including single-row and multi-row structures, diverse cage options and full precision grades, widely used in precision machinery, power transmission, rail transit and general heavy industry.

Modern equipment is continuously upgraded toward high speed, high precision and long maintenance-free service cycle. High-speed motors, CNC machining centers and rail traction units keep raising rotating speed and rated load. Bearings need to maintain stable precision under high speed and heavy radial load. Ordinary cylindrical roller bearings suffer from insufficient roller machining accuracy, resulting in loud vibration and noise, and tend to develop raceway fatigue damage after long-term high-speed operation. Some products have cages with inadequate strength, facing risks of abrasion and deformation under high-speed conditions. Improper internal lubrication space hinders heat dissipation, leading to rapid grease deterioration and premature bearing failure. Machinery manufacturers are in urgent need of premium cylindrical roller bearings combining high radial load capacity, high-speed stability, low vibration and long service life. Optimized with modified roller end profile and advanced raceway superfinishing technology, NMT Cylindrical Roller Bearings improve roller stress status and reduce friction and vibration. Refined heat treatment balances hardness and toughness of steel to resist fatigue damage from alternating loads. Diverse structural designs flexibly satisfy shaft thermal expansion and axial force demands, delivering reliable supporting solutions for high-speed heavy-duty rotating equipment.

NMT Cylindrical Roller Bearings consist of inner ring, outer ring, cylindrical rollers and cages. Inner and outer rings of most versions are separable for convenient independent assembly, disassembly and maintenance. Line contact between cylindrical rolling elements and raceways realizes excellent radial load capacity. Different structures serve distinct functions: NU type outer ring with ribs and inner ring without ribs; N type inner ring with ribs and outer ring without ribs. Both enable free axial sliding to compensate shaft thermal expansion. NJ type inner ring with single rib and NF type outer ring with single rib can withstand unidirectional axial loads. NUP structure supports bidirectional axial force, commonly used in gearboxes requiring axial positioning. The product range covers single-row cylindrical roller bearings and multi-row types for ultra-heavy loads. Strict dimensional control and mirror superfinishing on rollers guarantee smooth rotation and low vibration. Optimized internal lubrication channels ensure even distribution of lubricants under high speed and effectively restrain temperature rise. The products are widely applied in large and medium industrial motors, CNC machine tool spindles, industrial gear reducers, wind turbine gearboxes, rail vehicle traction transmission, paper machine rollers and metallurgical roll supporting devices.

Inner rings, outer rings and cylindrical rollers are manufactured from high-quality refined bearing steel. Multiple forging procedures refine internal grain structure. Precise quenching and tempering achieve sufficient hardness on rolling contact surfaces while the core material retains favorable toughness to resist crack formation under alternating loads. Ultra-precision grinding is applied on contact surfaces of raceways and rollers to reduce contact friction and suppress temperature rise at high rotating speed. All finished bearings pass dimensional precision inspection, radial clearance classification, vibration and noise testing, high-speed durability test and alternating load fatigue test. Products with insufficient precision and fatigue resistance are eliminated to ensure consistent performance in mass production.

Multiple clearance series are available. Standard overall dimensions offer excellent industry interchangeability for convenient component replacement and upgrading on new and existing equipment.

Core Product Advantages

Line contact structure with parallel cylindrical rollers delivers excellent radial load capacity for heavy radial load applications;

Multiple structural options support free axial sliding or unidirectional / bidirectional axial load bearing to meet various shaft positioning requirements;

Separable inner and outer rings simplify assembly and disassembly, greatly facilitating inspection and maintenance of motors and gearboxes;

Precision roller profiling combined with raceway superfinishing ensures low vibration and noise, satisfying accuracy demands of precision machine tools and high-speed motors;

Outstanding limiting speed with lower friction loss compared with similar heavy-duty bearings, realizing controllable temperature rise during continuous operation;

Diversified cage selections: stamped cages for general conditions and solid cages for rigorous high-speed, high-temperature and heavy-load environments;

Mature heat treatment balances hardness and toughness, providing good fatigue and vibration resistance for long-term continuous operation;

Complete specifications with single-row and multi-row models, covering small and medium driving equipment as well as large rolling mills and wind power transmission equipment.

Typical Application Scenarios

Large and medium asynchronous motors, servo spindle motors; precision spindle units of CNC lathes and machining centers; various industrial gear reducers, wind turbine gearboxes; traction transmission systems of high-speed trains and urban rail vehicles; press rolls and drying cylinder supports for paper machinery; medium and small rolling mill roll systems in metallurgy industry; main shafts of large centrifugal fans and air compressors; transmission mechanisms of port lifting equipment.

Quality Assurance

Raw materials of NMT Cylindrical Roller Bearings receive sampling inspection on hardness, metallographic structure and impurity content upon entry to strictly control raw material quality. Forged blanks of inner rings, outer rings and rollers fully release residual forging stress and sequentially go through precision turning, heat treatment, rough grinding and mirror superfinishing of raceways. Rolling elements are grouped and assembled according to high precision grades to guarantee even load sharing. All types of cages are precisely machined and deburred to guide smooth roller circulation. All finished goods undergo visual inspection, clearance sorting, vibration testing and long-time high-speed durability experiments. Bearings dedicated for rail transit and high-speed machine tools undertake additional continuous vibration simulation endurance tests. Non-conforming products are separated independently. Every cylindrical roller bearing provides stable load capacity, precise rotation and reliable fatigue resistance, reducing unplanned shutdown failures of power equipment.

Product Range

Single-row cylindrical roller bearings, multi-row cylindrical roller bearings; NU, N, NJ, NF, NUP various structures; stamped cages and solid cages optional; complete specifications of standard clearance, C3 and C4 large clearance. Model selection is determined by radial load magnitude, rotating speed, axial expansion demand and temperature environment.

Brand Strength

NMT focuses on R&D and manufacturing of cylindrical roller bearings. Targeting operating characteristics of high radial load, continuous vibration and long-term nonstop operation on high-speed motors, precision machine tools and rail transit equipment, NMT continuously optimizes roller profile design, superfinishing technology and heat treatment system. The bearings effectively solve industry challenges such as high-speed vibration and premature fatigue peeling, help machinery manufacturers improve overall equipment stability and cut long-term operation and maintenance costs.