Industrial gear reducers, metallurgical rolling mills, large construction machinery, internal combustion engines, paper-making roll systems and mine conveyor drums bear tremendous radial loads for a long time. Some equipment operates at relatively high rotating speed, putting strict requirements on bearing load capacity, rigidity and high-speed stability. Conventional ball bearings have small rolling contact areas. Under heavy load conditions, contact stress concentration easily occurs, leading to fatigue peeling within a short period, failing to satisfy continuous operation demands of heavy machinery. Featuring line contact load characteristics, cylindrical roller bearings deliver outstanding radial load capacity. Multiple structural designs allow free axial movement to accommodate thermal expansion and contraction of shafts during operation, effectively preventing seizure caused by additional internal stress. Many heavy equipment maintenance tasks require convenient disassembly and assembly. Separable bearings enable independent installation of inner and outer rings and greatly simplify overhaul procedures. NMT Cylindrical Roller Bearings come in multiple structural types including NU, NJ, N and NF series to meet diverse axial limit requirements, widely adopted in various medium-high speed and heavy-duty industrial equipment.

Heavy machinery and transmission equipment are continuously upgraded toward high power and large scale. Loads on reducers and rolling mills keep rising, accompanied by frequent alternating loads during startup and shutdown. Ordinary roller bearings lack optimized roller profile design, resulting in uneven stress distribution, local overheating and premature abrasion. Some cages suffer insufficient strength and deform or break under shock loads. Shafts of many transmission devices expand and contract axially with temperature variation. Bearings without axial displacement compensation will generate extra axial force and accelerate wear of rolling elements and raceways. Equipment manufacturers and maintenance suppliers are in urgent demand for cylindrical roller bearings with high load capacity, strong rigidity, diversified structures and easy assembly. Optimized with logarithmic roller profiles to improve stress distribution and reduce edge stress on raceways, NMT Cylindrical Roller Bearings are equipped with cages of multiple materials to adapt to complex conditions such as high speed, heavy load and vibration. Benefiting from separable construction, they perfectly match all types of heavy transmission machinery.

Designed with line contact between rollers and raceways, NMT Cylindrical Roller Bearings exhibit excellent radial load capacity and higher limiting speed than spherical roller bearings of the same size. A full range of structural types are available: NU type without inner ring ribs allowing bidirectional axial floating of shafts; NJ type with single rib to withstand unidirectional axial load; N type without outer ring ribs; NF type with single outer ring rib to fulfill various axial positioning demands. Inner and outer components are separable; inner rings, outer rings and roller assemblies can be installed and removed independently for split assembly and on-site maintenance. Super-finished rollers adopt optimized modified profiles to alleviate edge load effect and lower temperature rise during operation. Two cage options are provided: stamped steel cages feature lightweight structure for regular medium-speed conditions; solid brass cages possess stronger rigidity, high temperature resistance and shock resistance for rigorous high-speed, heavy-load and high-vibration scenarios. The products are extensively matched with industrial gearboxes, metallurgical roll supports, excavator transmission mechanisms, large fan main shafts, cement equipment rollers and crankshaft parts of internal combustion engines.

Inner rings, outer rings and rollers are made of high-purity bearing steel via precision forging and deep heat treatment. Sufficient surface hardness and good matrix toughness prevent cracking under impact loads. Superfinishing is applied on raceways and rollers to reduce friction and heat accumulation. All finished products pass dimensional verification, clearance classification and rotation testing. Models dedicated for rolling mills and reducers receive additional alternating load durability simulation tests. Units with abnormal operating noise and substandard precision are eliminated to guarantee consistent quality among batches.

The complete specification range covers standard clearance, C3 and C4 enlarged clearance with abundant structural series, supplying reliable cylindrical roller bearing solutions for heavy-duty transmission equipment.

Core Product Advantages

Line contact rolling structure with extremely strong radial load capacity and superior rigidity for all kinds of heavy load working conditions;

Diverse structural options including NU/NJ/N/NF to satisfy different demands for axial floating and unidirectional axial positioning;

Separable bearing components allow independent disassembly and installation of inner and outer rings, greatly facilitating equipment assembly, maintenance and replacement;

Modified roller profiles relieve edge stress concentration, delay raceway fatigue peeling and extend service life effectively;

Two mainstream cage alternatives: cost-effective steel cages, brass cages with stronger high temperature and shock resistance;

Full specifications of standard clearance, C3 and C4 enlarged clearance adapting to shaft thermal expansion under heavy load;

Excellent limiting rotating speed balancing heavy load and medium-high speed operation requirements;

Dimensions conform to international general standards with good interchangeability, no modification needed on bearing housings when replacing bearings on new and old equipment.

Typical Application Scenarios

All types of gear reducers and planetary reducers; metallurgical hot and cold rolling mills and roll supporting devices; transmission systems of construction machinery such as excavators and loaders; press rolls and drying roll assemblies for paper-making machinery; heavy-duty mine belt conveyor drums; main shafts of large industrial fans and blowers; crankshafts and gearboxes of diesel internal combustion engines; large rotary equipment in cement and building material production lines.

Quality Assurance

Raw materials of NMT Cylindrical Roller Bearings receive metallographic structure and hardness sampling inspection upon warehouse entry to strictly control impurity content of steel. Blanks of inner rings, outer rings and rollers eliminate internal stress through forging and undergo precision forming via turning, heat treatment, rough grinding and superfinishing processes. Rollers are grouped and matched strictly according to dimensions to ensure uniform stress distribution. Cages are precisely processed with burr removal to guarantee smooth roller movement without jamming. Every finished bearing passes appearance inspection, radial clearance sorting and no-load noise testing. Bearings for rolling mills and heavy-duty reducers receive extra impact fatigue simulation tests. Defective products are sorted separately. Each cylindrical roller bearing delivers sufficient rigidity, stable rotation and qualified load resistance, providing long-term support for heavy-duty transmission equipment in heavy industry.

Product Range

NU inner ring rib-free type, NJ single rib type, N outer ring rib-free type, NF single outer ring rib cylindrical roller bearings; specifications including standard clearance, C3 and C4 enlarged clearance. Model selection based on load magnitude, rotating speed, axial limit requirements and vibration environment.

Brand Strength

NMT devotes to R&D and manufacturing of heavy-duty cylindrical roller bearings. Targeting long-term alternating heavy-load conditions of reducers and metallurgical rolling mills, NMT continuously optimizes roller profiling technology, heat treatment schemes and cage structures. The bearings effectively reduce common failures such as edge stress abrasion, high-temperature fatigue and cage damage. NMT helps manufacturers improve overall equipment stability and cut operation, maintenance and replacement costs of heavy machinery.