Cylindrical roller bearings are assembled by inner rings, outer rings, cylindrical rollers and cages. Linear cylindrical rollers form line contact with raceways, providing extremely high radial load capacity to withstand heavy radial loads. Multiple series including NU, NJ, NUP and N are available. Some variants can bear unidirectional axial loads. Featuring compact structure and outstanding rigidity, they achieve excellent limiting speed performance, making them ideal for transmission scenarios requiring high rigidity, high speed and heavy radial loads. The products are widely applied in large and medium-sized motors, industrial gearboxes, precision CNC machine tools, mill roll systems, fan main shafts, air compressors, construction machinery gearboxes and other core transmission equipment.

Compared with deep groove ball bearings, cylindrical roller bearings deliver greatly improved load capacity and rigidity due to line contact, suitable for heavy-load conditions, while they can barely bear pure axial loads. Different from spherical roller bearings, this type of bearing has no self-aligning capacity and requires strict coaxiality between shafts and bearing housings. It features lower friction resistance and higher allowable rotating speed, serving as preferred supporting parts for high-speed precision transmission equipment. Motors, gearboxes and precision machine tools demand stable spindle operation and high rotary accuracy. Insufficient bearing rigidity will easily cause vibration and excessive noise, directly affecting machining precision and equipment service life. Ordinary cylindrical roller bearings on the market usually suffer from large dimensional dispersion of rollers, rough end surface machining and insufficient raceway grinding precision. Excessive temperature rise occurs under continuous high-speed operation, easily triggering fatigue pitting and shortening maintenance cycles of transmission systems.

NMT Cylindrical Roller Bearings feature a complete product line covering NU, NJ, NUP and N series. Normal clearance, C3 and C4 clearance are optional. Stamped steel cages and machined solid cages are available. Specifications include small-medium and medium-large sizes, fully meeting assembly demands of industrial equipment such as motors, gearboxes, fans and precision machine tools.

With continuous upgrading of precision equipment and high-power transmission machinery, industrial motors and high-speed gearboxes are developed toward higher rotating speed and larger output torque. Stricter standards are raised for bearing rotary accuracy, high-speed stability, rigidity and long-term wear resistance to reduce equipment vibration and extend lubrication maintenance intervals. Conventional cylindrical roller bearings lack sufficient control over roller profile precision. Uneven stress occurs during high-speed rotation, and micro defects on raceway surfaces tend to expand continuously, leading to overheating, abnormal noise and aggravated wear during long-term high-speed operation, failing to satisfy requirements of long-time non-stop operation for high-end transmission equipment. Equipment manufacturers are in urgent need of high-rigidity, low-temperature-rise and high-precision cylindrical roller bearing solutions.

NMT Cylindrical Roller Bearings adopt optimized profiles for cylindrical rollers to improve contact status between rollers and raceways and effectively relieve edge stress concentration. A complete roller grading and screening system strictly controls dimensional tolerances of rollers. Ultra-precision mirror grinding is adopted for inner and outer raceways to enhance surface finish. Heat treatment processes are continuously optimized to balance hardness and toughness of steel and improve anti-fatigue performance. Guide structures of cages are improved to reduce churning friction and restrain temperature rise under high-speed operation, delivering stable and reliable supporting guarantee for various transmission equipment operating under high speed and heavy radial loads.

NMT Cylindrical Roller Bearings consist of inner rings, outer rings, cylindrical rollers and high-strength cages. NU type allows free axial movement for both inner and outer rings; NJ type can withstand unidirectional axial loads; NUP structure enables simple bidirectional axial positioning. Stamped steel cages fit regular medium-low speed working conditions, while machined solid cages possess higher rigidity for high-speed and heavy-load environments. Normal clearance applies to common industrial motors and standard gearboxes; enlarged C3 and C4 clearance adapt to high-power motors and high-speed transmission mechanisms to compensate thermal expansion during operation. The line contact design of cylindrical rollers brings excellent radial rigidity to bear massive radial loads with moderate operating resistance and superior high-speed performance. All cylindrical rollers undergo precise dimensional sorting before assembly to ensure uniform load distribution and avoid raceway damage caused by local stress concentration. The products are extensively used in large and medium asynchronous motors, reducer gearboxes, CNC lathe main shafts, fans, air compressors, metallurgical work rolls and construction machinery transmission boxes.

High-purity bearing alloy steel is selected for inner rings, outer rings and cylindrical rollers. Multiple forging processes refine internal grain structure. Accurate constant-temperature quenching and tempering balance high surface hardness of raceways and matrix toughness to resist fatigue damage caused by continuous alternating radial loads. Multi-layer ultra-precision grinding is implemented on inner and outer raceways to optimize surface micro-morphology, facilitate stable formation of lubricating oil film and reduce frictional temperature rise during high-speed operation. All finished products pass geometric dimension inspection, roller grouping verification, radial clearance sorting, high-speed endurance temperature rise test and sampling fatigue life verification. Defective workpieces are eliminated to guarantee consistent performance of mass-produced bearings.

Multiple structural models, clearance specifications and cage types are optional. International standard outer dimensions ensure excellent interchangeability for convenient assembly, commissioning and maintenance replacement of all kinds of transmission equipment.

Core Product Advantages

Line contact structure of cylindrical rollers provides outstanding radial load capacity and sufficient rigidity for various heavy radial load transmission conditions.

Multiple mature structures including NU, NJ and NUP are optional to satisfy different assembly demands: free floating, unidirectional positioning and bidirectional positioning.

Excellent high-speed performance with low friction loss and stable temperature control, widely suitable for high-speed motors and precision spindle equipment.

Multiple configurations: stamped steel cages and machined solid cages, covering regular working conditions and harsh high-speed heavy-load scenarios.

Complete clearance options: normal clearance, C3 and C4 enlarged clearance, adapting to normal-temperature equipment and high-power high-speed transmission devices prone to temperature rise.

Precise grading and screening of rollers guarantee high dimensional consistency, effectively lowering vibration under high-speed operation and delaying the occurrence of fatigue pitting.

Ultra-precision mirror grinding on inner and outer raceways achieves high surface accuracy, reduces friction loss and maintains stable rotary accuracy during long-term operation.

Standardized outer dimensions with strong universality, widely matched with motors, gearboxes, fans, CNC machine tools and metallurgical mill equipment.

Typical Application Scenarios

Large and medium industrial motors, explosion-proof motors, variable frequency motors; various reducers and industrial gearboxes; main shafts of CNC lathes, grinders and other precision machine tools; centrifugal fans, air compressors, vacuum pumps; metallurgical mill roller tables and work roll supports; gearboxes of loaders, excavators and other construction machinery; large transmission mechanisms of papermaking and textile machinery.

Quality Assurance

Raw materials of NMT Cylindrical Roller Bearings receive sampling inspection for hardness, metallographic structure and non-metallic inclusions upon warehousing to control raw material quality fundamentally. Forged blanks of inner and outer rings fully release residual forging stress and sequentially undergo precision turning, heat treatment, rough grinding and ultra-precision raceway grinding. All cylindrical rollers are graded and grouped according to high-precision standards to ensure uniform load distribution and relieve stress concentration under high-speed conditions. After forming, different types of cages pass strength, high-speed vibration resistance and wear resistance tests. All finished goods pass visual inspection, clearance screening, high-speed endurance test and temperature rise detection. Non-conforming products are separated independently. Every cylindrical roller bearing features smooth rotation, stable rigidity and low noise at high speed, supporting long-term stable operation of all kinds of precision transmission equipment.

Product Range

NU, NJ, NUP, N series cylindrical roller bearings; normal clearance, C3 and C4 clearance optional; stamped steel cages, machined solid cages; specifications cover small-medium and medium-large cylindrical roller bearings. Model selection depends on load magnitude, rotating speed, axial positioning requirements and temperature rise conditions.

Brand Strength

NMT devotes itself to R&D and manufacturing of precision transmission bearings. Targeting operating characteristics of motors, gearboxes and precision machine tools including high speed, heavy load, strict coaxiality requirements and long continuous running time, NMT continuously optimizes roller profile design, roller screening standards, raceway grinding technology and heat treatment schemes. It solves common industry problems such as excessive temperature rise at high speed, severe operating vibration and raceway fatigue pitting. NMT helps machinery manufacturers improve overall equipment operation accuracy, extend bearing service life and reduce equipment maintenance frequency.