Cylindrical roller bearings adopt cylindrical rollers as rolling elements and possess extremely high radial load capacity. They mainly bear radial loads, and some structural models can withstand a small amount of unidirectional axial loads. Multiple structural types are available including NU, NJ, N and NF series. The inner ring or outer ring of certain models can be separated for convenient installation and disassembly. They are widely used under heavy-load and medium-speed conditions, extensively matched on industrial reducers, mining equipment, metallurgical machinery, papermaking equipment, large fans, auxiliary rolling mill mechanisms, construction machinery transmission boxes and other heavy-duty equipment. Compared with ball bearings, cylindrical rollers feature line contact with larger contact area and outstanding performance against impact and heavy loads. Different from tapered roller bearings, they have lower friction coefficient and better temperature rise control, making them suitable for heavy-load transmission scenarios with continuous stable operation, while their axial load capacity is relatively limited. Mining, metallurgical equipment and heavy-duty reducers operate under harsh conditions with impact loads and heavy dust for a long time. Rotating shafts sustain huge radial force continuously, and alternating impact loads occur during equipment start-up and shutdown. Ordinary deep groove ball bearings cannot meet heavy-load requirements and tend to suffer early failures such as rolling element indentation and raceway spalling. Conventional cylindrical roller bearings on the market usually have defects including insufficient roller machining precision, poor dimensional consistency of rollers and weak structural strength of cages. Long-term heavy-load operation easily leads to intensified vibration, accelerated wear and continuously rising operating noise. NMT Cylindrical Roller Bearings own complete product range with various structural types, stamped steel cages and solid brass cages optional to adapt to different impact conditions. Abundant clearance specifications and sizes cover small-medium specifications and large industrial standard dimensions, fully satisfying mass supporting demands of heavy-duty transmission machinery, mining and metallurgical equipment and large fan facilities.

With continuous upgrading of heavy industrial equipment, mining machinery, metallurgical rolling mills and high-power reducers endure persistent heavy loads and periodic impact loads all year round. The industry sets higher standards on bearing load limit, impact resistance and wear-resistant service life. Many heavy-duty transmission boxes have limited installation space. Equipment bears alternating radial impact loads during operation, imposing strict requirements on dimensional precision of rollers and machining quality of raceways. Plenty of heat is generated during equipment operation. Excessive internal friction of bearings causes continuous temperature rise and accelerates aging and failure of lubricating grease, directly shortening maintenance intervals of complete equipment. A large number of ordinary cylindrical roller bearings adopt loose control standards for roller grouping with wide dimensional dispersion, resulting in uneven force under heavy loads. Insufficient impact resistance of cages easily triggers wear and deformation in dusty environments and causes abnormal bearing damage. Equipment manufacturers are in urgent demand of high-quality cylindrical roller bearings with large load capacity, excellent shock resistance, durable wear resistance and stable operation. Optimized with revised roller profile crowning design to effectively relieve edge stress concentration at both ends of rollers and enhance durability under heavy loads, NMT Cylindrical Roller Bearings adopt strict high-precision roller screening and grouping procedures to guarantee highly unified dimensions of all rolling elements. Upgraded ultra-precision grinding of inner and outer rings improves surface finish and geometric accuracy of raceways and reduces operational friction loss, providing stable and reliable heavy-load supporting solutions for all kinds of heavy industrial mechanical equipment.

NMT Cylindrical Roller Bearings consist of inner ring, outer ring, cylindrical rollers and cages. The line contact structure endows bearings with superior radial load capacity. Some structural versions can bear a certain degree of unidirectional axial loads, and separable structures facilitate disassembly, assembly and maintenance. Multiple structural series are available. NU and N types have no ribs or single-side ribs on inner and outer rings, allowing slight axial displacement of shaft systems; NJ and NF series are equipped with ribs to withstand unidirectional axial force. Stamped steel cages feature light weight and suit conventional heavy-load conditions; solid brass cages deliver high structural strength and excellent impact resistance, adapting to harsh scenarios with intense and frequent vibration and impact. Precisely sorted rollers cooperate with ultra-fine ground raceways to effectively reduce vibration under heavy loads and delay fatigue spalling of raceways. All rollers complete precision grouping and screening before assembly to strictly control dimensional errors and guarantee balanced force when bearings bear loads. The products are extensively matched on high-power gear reducers, mining crushers, conveying rollers, auxiliary metallurgical rolling mill equipment, large industrial fans, papermaking press rolls, construction machinery transmission boxes and other heavy-duty devices.

Inner rings, outer rings and cylindrical rollers are manufactured from high-purity bearing chromium alloy steel. Multiple forging processes refine internal grain structure. Precise constant-temperature quenching and tempering guarantee qualified hardness on working surfaces of raceways and rollers while the matrix retains reasonable toughness to resist fatigue damage induced by long-term alternating heavy loads and impact loads. Multiple ultra-precision grinding procedures are carried out on inner and outer raceways to reduce surface roughness and cut frictional heat under heavy-load operation. All finished bearings pass dimensional precision inspection, roller grouping screening, radial clearance verification, long-time heavy-load durability test and vibration grade detection. Unqualified workpieces are eliminated to ensure consistent performance of mass products.

Various structural models and clearance specifications are optional with standard industry outer dimensions and excellent interchangeability for convenient maintenance and replacement of spare parts on all kinds of heavy-duty mechanical equipment.

Core Product Advantages

Line contact structure of cylindrical rollers delivers outstanding radial load capacity. Multiple structures optional, and partial models support bearing a small amount of unidirectional axial loads;

Separable inner and outer ring structure enables easy disassembly and assembly, convenient for daily equipment maintenance and bearing replacement;

Two cage solutions including stamped steel cage and solid brass cage optional, adapting to conventional heavy-load conditions and harsh strong-impact environments respectively;

Roller profile crowning technology relieves edge stress concentration and effectively avoids edge wear under heavy-load operation;

High-precision graded rollers feature narrow dimensional dispersion, realizing uniform load distribution under heavy loads and improving overall anti-fatigue performance;

Ultra-precision grinding applied on inner and outer raceways delivers excellent surface finish, lower friction loss and restrains temperature rise during long-term operation;

Premium bearing alloy steel combined with mature heat treatment achieves great wear resistance, impact resistance and anti-spalling performance to extend service life of heavy-duty equipment;

Standardized universal outer dimensions adapt to various reducers and mining machinery for easy procurement, replacement and assembly of spare parts.

Typical Application Scenarios

High-power gear reducers and planetary reducers; mining crushers, ore conveying rollers and transmission assemblies of tunneling machinery; auxiliary transmission mechanisms of metallurgical rolling mills and continuous casting equipment; large industrial induced draft fans, blowers and wind power transmission devices; supporting parts of press rolls and drying cylinders in papermaking machinery; cement building material production equipment and auxiliary components of ball mills; gearboxes and hoisting mechanisms of construction machinery; heavy supporting positions of large water pumps and turbine transmission systems.

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 and outer rings fully release residual forging stress and sequentially undergo precision turning, heat treatment, rough grinding and ultra-precision grinding of raceways. All cylindrical rollers are graded and grouped according to high precision standards to guarantee balanced load distribution of bearings under heavy-load operation. Impact durability and wear resistance tests are conducted on formed cages. All finished goods pass visual inspection, radial clearance screening, geometric precision detection and long-time heavy-load vibration & temperature rise durability test. Special heavy-duty models for mining and metallurgy receive additional alternating impact simulation tests. Non-conforming products are separated independently. Every cylindrical roller bearing features stable load capacity, strong impact resistance and durable wear resistance, effectively lowering risks of unexpected shutdown failures of heavy industrial equipment.

Product Range

Cylindrical roller bearings of NU, NJ, N, NF multiple structures; stamped steel cages and solid brass cages optional; multiple clearance specifications; covering small-medium to large industrial standard sizes. Model selection depends on load magnitude, impact intensity, axial displacement demand and service environment.

Brand Strength

NMT focuses on R&D and manufacturing of heavy-duty cylindrical roller bearings. Targeting harsh working characteristics including heavy loads, alternating impact and heavy dust for reducers and mining machinery, NMT continuously optimizes roller crowning design, ultra-precision grinding technology and cage strength standards. The bearings solve industry pain points such as heavy-load stress concentration, impact wear and fatigue spalling after long-term operation, help heavy equipment manufacturers improve overall operation stability and extend maintenance intervals of transmission components.