Cylindrical roller bearings consist mainly of inner rings, outer rings, cylindrical rollers and cages. They feature outstanding capacity to withstand pure radial loads. Some structural designs allow relative axial displacement between inner and outer rings and offer axial floating compensation. These bearings possess long rolling contact lines, sufficient rigidity and high rated radial load, together with favorable limiting speed performance. They act as core supporting components for large and medium-sized motors, gear reducers, metallurgical rollers, fans and mining equipment. They are widely adopted in industrial drive motors, gearboxes, metallurgical roller tables, auxiliary rolling mill equipment, large fans, air compressors, construction machinery gearboxes and other machinery enduring continuous heavy radial loads.

Compared with deep groove ball bearings, cylindrical roller bearings have longer effective contact length and several times higher radial load capacity as well as enhanced structural rigidity. In contrast to tapered roller bearings, cylindrical roller bearings mainly carry radial loads and barely sustain axial force. They deliver lower rolling friction and permit higher operating speeds, making them ideal for high-speed heavy-duty applications dominated by radial force. Industrial motors, large reducers and metallurgical production lines run continuously all year round under steady radial loads accompanied by vibration and temperature fluctuation. Once bearings suffer fatigue wear, rotor eccentricity, abnormal noise during gear meshing and intensified overall vibration will occur. In severe cases, motor rotor-stator rubbing or gear tooth breakage may lead to shutdown. Ordinary cylindrical roller bearings on the market have defects including inconsistent roller dimensions, insufficient machining precision of raceways and inadequate toughness after heat treatment. Fatigue pitting and roller spalling tend to appear under long-term continuous operation and shorten equipment maintenance intervals.

NMT Cylindrical Roller Bearings feature a complete product portfolio covering mainstream structural types such as NU, NJ, NUP, N and NF, with multiple schemes of single rib, double rib and rib-free structures. Stamped steel cages and brass solid cages are optional. Dimensions range from small and medium precision specifications to large heavy-duty sizes, fully meeting matching demands of motors, reducers, metallurgical machinery and fan equipment.

With continuous upgrading of heavy industry and general automation equipment, high-power motors, large gear reducers and continuous metallurgical production lines impose stricter requirements on bearing load capacity, high-speed stability and long-term durability. Many transmission equipment has compact internal space, requiring bearings to bear massive radial loads at high rotating speed, control temperature rise, reduce vibration and noise and cut downtime for maintenance. Ordinary cylindrical roller bearings lack crowning optimization on roller end faces. Stress concentration easily emerges during operation, resulting in premature failure after prolonged high-speed heavy-duty running. Manufacturers are in urgent need of precision cylindrical roller bearing solutions featuring high rigidity, low heat generation and stable service life.

NMT Cylindrical Roller Bearings adopt crowning processing on cylindrical roller end faces to improve contact status between rollers, ribs and raceways and effectively relieve edge stress concentration. A high-precision automatic roller sorting system is established to strictly control dimensional tolerance of each group of rollers. Multiple ultra-precision grinding processes are applied to inner and outer raceways to optimize surface roughness. Heat treatment technology is continuously improved to balance hardness and toughness of steel materials. The guide structure of cages is optimized to enhance circulation of lubricant and restrain friction temperature rise under high-speed operation, providing stable and reliable support guarantee for high-speed heavy-duty transmission equipment.

NMT Cylindrical Roller Bearings are composed of inner rings, outer rings, cylindrical rollers and cages. Various models are classified according to rib structures: NU type with ribs on outer ring and rib-free inner ring enables free axial floating; NJ type with single rib on inner ring can sustain slight unidirectional axial load; NUP structure realizes axial positioning. Cylindrical rollers form linear contact along raceways and exhibit prominent radial load capacity. Stamped steel cages feature excellent cost performance for general working conditions. Brass solid cages deliver high guiding precision and good heat resistance, suitable for harsh environments with high speed, high temperature and heavy loads. High-precision cylindrical rollers cooperate with precision-ground raceways to achieve even load distribution and high structural rigidity. All rollers undergo dimensional classification and screening before assembly to guarantee uniform dimensions within each group and avoid local overload. The products are extensively applied in industrial drive motors, gear reducers, metallurgical roller table equipment, large centrifugal fans, air compressors, mining conveying machinery and other machinery.

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

A variety of structural forms and cage types are optional. Standard universal outer dimensions ensure good interchangeability for convenient assembly, maintenance and replacement on all types of industrial equipment.

Core Product Advantages

Linear contact structure delivers excellent radial load capacity and sufficient rigidity for continuous heavy-duty working conditions.

Multiple rib structures (NU/NJ/NUP/N) are optional to support diverse assembly schemes including floating installation and axial positioning.

Optimized crowning on roller end faces alleviates stress concentration in contact zones and reduces failure risks such as fatigue pitting and spalling.

Dual solutions of stamped steel cages and brass solid cages cover general working conditions as well as harsh high-speed and high-temperature scenarios.

High-precision classification and screening of rollers ensure outstanding dimensional consistency, evenly disperse loads, delay fatigue wear and extend service life.

Ultra-precision grinding on inner and outer raceways achieves superior surface accuracy, stable high-speed operation and effective suppression of vibration and operating noise.

Premium bearing alloy steel combined with mature heat treatment balances hardness and toughness, delivering remarkable fatigue resistance and vibration resistance.

Standardized outer dimensions with strong universality, widely applicable to industrial motors, reducers, metallurgical equipment, fans and various other machinery.

Typical Application Scenarios

Large and medium-sized industrial drive motors and variable frequency motors; various gear reducers and planetary reduction units; metallurgical rolling mills and roller table conveying equipment; large centrifugal fans, blowers and air compressors; mining conveying machinery; papermaking machinery; auxiliary marine transmission systems; gearboxes of large construction 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 in accordance with high-precision standards to guarantee even load distribution under heavy loads. Strength, heat resistance and wear endurance tests are carried out on formed cages. All finished goods pass visual inspection, clearance screening, geometric precision detection and high-speed endurance temperature rise test. Non-conforming products are separated independently. Every cylindrical roller bearing operates smoothly with stable load capacity, supporting long-term continuous stable operation of all kinds of industrial equipment.

Product Range

Full series of cylindrical roller bearings including NU, NJ, NUP, N, NF; standard type and reinforced heavy-duty type optional; stamped steel cages and brass solid cages optional; dimensional specifications cover small-medium precision bearings up to large heavy-duty bearings. Model selection depends on load type, rotating speed, temperature environment and demand for axial floating.

Brand Strength

NMT focuses on R&D and manufacturing of heavy-duty precision bearings. Targeting working characteristics of industrial motors, reducers and metallurgical equipment such as high-speed radial heavy load, long continuous operation and drastic temperature fluctuation, NMT continuously optimizes roller profiles, raceway machining precision, heat treatment and lubrication matching design. It solves common industry challenges including stress concentration under high-speed heavy load, excessive operating temperature rise and premature fatigue damage. NMT helps manufacturers extend equipment maintenance cycles, cut component replacement costs and improve overall operational stability of transmission systems.