High-power variable frequency motors, heavy-duty gear reducers, metallurgical rolling mill rolls, high-speed gearboxes and screw air compressor main shafts are core equipment for heavy industry and precision transmission. Cylindrical roller bearing support positions operate under harsh long-term conditions: intensive continuous radial loads, continuous high-speed rotation, axial thermal elongation caused by operational heat, alternating load impact, metal debris mixed into lubricating oil, frequent start-stop cycles and strict requirements for support rigidity. Long shafts expand thermally during high-speed operation. If bearings cannot float axially, additional axial force will be generated on the shaft system, leading to bearing seizure and excessive temperature rise. Conventional cylindrical roller bearings often suffer edge stress concentration on rollers, insufficient cage guiding precision and surface scuffing under high-speed lubrication conditions. Once bearings fail, excessive motor vibration, deteriorated gear meshing of reducers and poor surface quality of rolled materials will occur, resulting in massive production losses. The separable structure facilitates inspection and replacement, making it the mainstream choice for high-power transmission equipment.

Focusing on R&D and manufacturing of high-speed heavy-duty radial support bearings, Japan NMT launches single-row cylindrical roller bearing series to solve industry pain points of traditional models including excessive temperature rise at high speed, easy edge pitting and spalling of rollers, unstable cage guidance at high speed and insufficient clearance adaptability. Adopting optimized line-contact cylindrical roller design, combined with five core upgrades including high-purity vacuum degassed bearing steel, precision roller crowning, high-precision stamped/solid cages, modular multi-rib structure design and wide-range standard/C3/C4 clearances, the lineup covers NU, NJ, N, NUP mainstream types. Floating types compensate shaft thermal elongation, locating types achieve unidirectional axial restriction. Widely matched with motors, reducers, rolling mills and high-speed transmission equipment, the bearings optimize contact stress distribution, reduce frictional heat generation at high speed and extend fatigue service life under continuous high-speed heavy loads.

Core Product Advantages

1. Ultra-high radial load capacity and high rigidity suitable for high-speed transmission: Line-contact roller structure provides large effective bearing area and outstanding radial rigidity, with higher limiting speed than most heavy-duty roller bearings, ideal for equipment requiring both high rotational speed and rigid support such as high-power motors and high-speed gearboxes.

2. Separable inner and outer rings for convenient assembly and maintenance: Inner ring, outer ring and roller-cage assembly can be disassembled, enabling separate assembly of shafts and housings without shaft threading. It greatly improves on-site maintenance efficiency for large equipment and reduces disassembly workload of complete machines.

3. Multiple rib structures available for floating and axial positioning demands: NU ribless design allows free thermal expansion of shafts to eliminate additional stress caused by thermal growth; NJ single rib and NUP rib + stop ring structures deliver unidirectional axial restraint to realize shaft positioning with flexible configuration options.

4. Precision roller crowning relieving edge stress and preventing edge spalling: Micro-arc crown profiling on both roller ends eliminates peak edge stress under skewed and heavy-load conditions, reducing edge pitting and surface scuffing and markedly improving contact fatigue durability under alternating loads.

5. Diverse cage and clearance specifications adapting to various working conditions: Stamped steel cages for regular medium-high speed conditions; solid brass cages for high temperature, ultra-high speed and impact environments; optional C0, C3, C4 clearances to satisfy different temperature rise and load requirements of motors and rolling mills.

Application Scenarios

Main shaft supports for large and medium variable frequency motors and asynchronous motors; high-speed and low-speed shaft bearings for heavy gear reducers and planetary gearboxes; roll supports for hot rolling mills, cold rolling mills and roller tables; main shaft bearings for screw air compressors and turbo blowers; supporting positions of high-speed speed increasers, paper machine rollers and large pump rotors.

Precision Quality Assurance

NMT cylindrical roller bearings are manufactured strictly in accordance with Japanese high-speed heavy-duty industrial bearing standards. Raw materials are inspected one by one via ultrasonic flaw detection. Tests including high-speed temperature rise durability test, alternating radial load fatigue test, roller contact stress simulation test, high-speed cage stability test and hot-cold cycle dimensional stability test are carried out. Featuring sufficient rigidity, stable high-speed operation and convenient disassembly, the bearings fully adapt to long-hour continuous high-speed heavy-load operation of motors, reducers and metallurgical rolling mills.

Product Range

Single-row cylindrical roller bearings NU, NJ, N, NUP series; stamped steel cages, solid brass cages; open construction; standard C0, C3, C4 clearances; complete standard size lineup, customized large-size non-standard sizes available.

Brand Strength

Japan NMT focuses on R&D and manufacturing of high-speed heavy-duty cylindrical roller bearings, specializing in core technologies including roller profile crowning simulation, high-speed friction control, cage guidance optimization and stabilized heat treatment. Supported by automatic precision machining lines and high-speed condition simulation laboratories, NMT solves common industry pain points such as excessive heat generation at high speed, roller edge spalling and unstable high-speed guidance of bearings for motors, rolling mills and reducers, supplying high-rigidity and long-life cylindrical roller bearing solutions for global heavy industry, electromechanical and metallurgical equipment manufacturers.