Cylindrical roller bearings are line-contact rotary supporting components. Owing to the linear contact between cylindrical rollers and raceways, they feature outstanding radial load capacity, widely adopted in industrial motors, gearboxes, metallurgical rolling mills, large fans, paper-making machinery, air compressors and other industrial equipment subject to heavy radial loads. This series contains diversified structures. NU-type and N-type without ribs allow slight axial displacement of shafts relative to housings, suitable for transmission shafts subject to thermal elongation during operation. NJ-type and NUP-type equipped with ribs withstand limited unidirectional axial loads to fit transmission systems with incidental axial force. Most cylindrical roller bearings adopt separable structures, so inner rings, outer rings and roller assemblies can be disassembled separately for easy installation and maintenance, ideal for production line equipment requiring regular servicing and mass assembly. Compared with ball bearings, cylindrical roller bearings own longer contact length and superior performance against load and vibration. In contrast to tapered roller bearings, they achieve higher limiting speed and fit long-term continuous high-speed operation. Industrial working environments are complicated. Metallurgical workshops suffer high temperature and heavy dust, and gearboxes endure alternating load impact continuously. Ordinary cylindrical roller bearings commonly have defects including insufficient roller machining precision, uneven hardness after heat treatment and inadequate cage rigidity. Long-term operation easily causes rolling element abrasion, raceway pitting and increased operating noise, seriously threatening equipment stability. NMT Cylindrical Roller Bearings deliver complete product portfolio covering NU, NJ, N and NUP structures, including inner ring rib-free, outer ring rib-free, single rib and double rib specifications. Both open and sealed versions are available. Sizes range from small-medium universal models to heavy-duty special specifications for rolling mills, meeting diversified demands of general motors, heavy reducers and large complete sets of metallurgical & mining equipment.

Modern industry develops toward high power and high speed. Large motors, steel rolling equipment and heavy gearboxes run continuously for extended periods. Transmission shafts expand thermally under operating temperature. If bearings cannot accommodate minor axial elongation, extra additional stress will emerge and accelerate bearing fatigue failure. Metallurgical production lines operate at elevated temperature. Metal dust constantly invades bearing cavities, deteriorates lubricating grease and aggravates abrasion on rolling contact surfaces. Periodic alternating radial force generated during gear meshing imposes strict requirements on uniform load distribution of bearings. Numerous ordinary cylindrical roller bearings on the market suffer large dimensional dispersion among rollers, leading to uneven load sharing, local stress concentration and premature pitting. Some thin cages lack stability at high speed and trigger vibration and abnormal noise. Machinery manufacturers are in urgent demand of premium cylindrical roller bearings with strong radial load capacity, high-speed stability, temperature & wear resistance and long service life. Optimized with revised roller end profile to relieve edge stress concentration, NMT Cylindrical Roller Bearings adopt strict roller grading and screening procedures to guarantee uniform force on all rolling elements. Improved heat treatment enhances surface toughness of raceways and rollers to resist dust abrasion and alternating load impact, providing stable and reliable supporting solutions for various high-speed heavy-duty industrial transmission equipment.

NMT Cylindrical Roller Bearings consist of inner ring, outer ring, cylindrical rollers and cages. Different models serve distinct functions: NU type with ribs on both sides of outer ring and rib-free inner ring enables free axial movement of inner ring for long shafts with thermal elongation; N type with ribs on both sides of inner ring and rib-free outer ring allows axial sliding of outer ring; NJ type with single rib on inner ring withstands unidirectional axial loads; NUP type fitted with fixed retaining ring realizes simple bidirectional axial positioning. Cages include stamped steel cages, solid brass cages and nylon cages. Solid brass cages possess strong rigidity and excellent heat resistance, prioritized for high-speed, high-temperature and heavy-load conditions. Cylindrical rollers adopt optimized crown machining to avoid local abrasion caused by edge contact under high speed and heavy load. All rollers undergo precision grouping before assembly to control dimensional errors and ensure even load distribution during rotation. The products are extensively equipped on large and medium three-phase asynchronous motors, gear reducers, support housings of metallurgical rolling mills, large centrifugal fans, paper press rolls, main shafts of screw air compressors and lifting transmission mechanisms for mining industry.

Inner rings, outer rings and cylindrical rollers are manufactured from high-purity alloy bearing steel. Repeated forging refines internal grain structure. Segmented constant-temperature quenching and tempering guarantee qualified hardness on rolling surfaces while the matrix retains sufficient toughness to resist fatigue damage induced by continuous alternating loads. Multiple superfinishing processes are carried out on raceways and roller surfaces to reduce surface roughness and relieve frictional heat during operation. All finished bearings pass dimensional inspection, roller grouping screening, radial clearance verification, long-time high-speed durability test and temperature rise monitoring. Unqualified workpieces are eliminated to guarantee consistent performance of mass products.

Multiple clearance groups and structural types are optional. Standard industry outer dimensions deliver good interchangeability for convenient maintenance and replacement of spare parts for all kinds of industrial equipment.

Core Product Advantages

Linear contact structure provides outstanding radial load capacity to bear heavy alternating radial loads for heavy-duty industrial transmission equipment;

Complete structures including NU, NJ, N, NUP satisfy installation demands such as axial floating, unidirectional axial bearing and axial positioning;

Separable structural design enables disassembly of components, simplifying assembly, disassembly and maintenance for large-scale production equipment;

Optimized crown design of rollers mitigates edge stress concentration, reduces local abrasion and extends bearing service life effectively;

High-precision grouping and screening of rollers strictly control dimensional deviation, disperse loads evenly and prevent premature failure from local stress;

Cages in various materials optional. Solid brass cages resist high temperature and centrifugal force, suitable for continuous operation under high speed and high temperature;

Premium alloy steel combined with stable heat treatment achieves excellent fatigue and pitting resistance with superior durability under dusty and high-temperature conditions;

Standard specifications with great universality for convenient replacement and assembly of new and old spare parts on motors, reducers and metallurgical equipment.

Typical Application Scenarios

Large and medium industrial three-phase asynchronous motors, variable-frequency high-speed motors; various gear reducers and planetary gearboxes; supporting parts of metallurgical hot rolling and cold rolling mills; large centrifugal fans and blowers; press rolls and conveying rolls of paper-making machinery; screw air compressors and large refrigeration compressors; mining lifting equipment and transmission mechanisms of cement production lines; small and medium power transmission devices for ships.

Quality Assurance

Raw materials of NMT Cylindrical Roller Bearings receive sampling inspection on hardness, metallographic structure and non-metallic inclusions upon warehousing to control raw material quality fundamentally. Forged blanks of inner rings, outer rings and rollers fully release residual forging stress and sequentially undergo precision turning, heat treatment, rough grinding and superfinishing of raceways and rollers. All cylindrical rollers are graded and grouped according to dimensional precision to guarantee uniform load distribution during rotation. Strength and heat resistance tests are carried out on formed cages of different materials. All finished goods pass visual inspection, radial clearance screening, precision detection and long-time high-speed durability & temperature rise test. Large bearings dedicated for metallurgy and rolling mills receive additional high-temperature dust simulation durability tests. Non-conforming products are separated independently. Every cylindrical roller bearing delivers stable load capacity, low vibration at high speed and reliable fatigue & wear resistance, effectively lowering risks of unplanned shutdown failures of heavy-duty industrial equipment.

Product Range

NU, NJ, N, NUP cylindrical roller bearings; open type, sealed type; stamped steel cages, solid brass cages, nylon cages; multiple clearance groups. Model selection depends on load magnitude, rotating speed, axial displacement demand and operating temperature.

Brand Strength

NMT focuses on R&D and manufacturing of cylindrical roller bearings. Targeting operating characteristics including high speed & heavy load, high temperature & dust and thermal elongation of transmission shafts for motors, gearboxes and metallurgical rolling mills, NMT continuously optimizes roller profile design, precision grinding technology and heat treatment system. The bearings solve industry pain points such as edge stress abrasion, excessive temperature rise at high speed and uneven force on rolling elements, help industrial equipment manufacturers improve operational stability of transmission systems and extend equipment maintenance intervals.