NJ208EM Is A Cylindrical Roller Bearing Used In The Transmission System Of Engineering Machinery
I. Product Overview:
The NJ208EM cylindrical roller bearing is a benchmark product among high-performance single-row cylindrical roller bearings, designed specifically for high radial load and continuous high-speed operation scenarios. It boasts excellent reliability and cost performance. As a classic single-row model, its structure of double-rib inner ring and solid cage (denoted by the suffix "EM") facilitates installation, debugging, and preload control, making it widely used in automotive gearboxes, precision machine tool spindles, construction machinery transmission systems, and other fields.
II. Core Parameters:
Inner diameter: 40mm; Outer diameter: 80mm; Width: 18mm
Adopts vacuum-degassed bearing steel (oxygen content ≤10ppm) with a hardness of HRC61-65, and its service life is 25% longer than that of traditional bearings.
Radial load capacity: 62kN; Axial load capacity: 7.2kN; Limiting speed: 9500r/min (grease lubrication), 13000r/min (oil lubrication)
Available in two precision grades: P0 (general grade) and P6 (precision grade). For the P6 grade, the raceway roundness error is ≤1.2μm, and the vibration value is reduced by 25%.
III. Core Technologies and Manufacturing Processes:
Material Innovation
Uses vacuum-degassed GCr15 bearing steel. Its microstructure is optimized through quenching + tempering processes, with wear resistance increased by 20% compared to ordinary electroslag steel. It is suitable for harsh environments such as high dust, strong impact, and a temperature range of -30℃ to 120℃.
Precision Design
Double-rib inner ring: Effectively restricts axial movement of rollers, improves the positioning accuracy of transmission systems, and adapts to the needs of high-precision equipment.
Solid cage (suffix "EM"): Optimizes the roller guidance trajectory, reduces friction loss by 18%, and significantly enhances stability during high-speed operation.
IV. Applications in the Construction Machinery Field
- Loader gearboxes: Widely used in loader transmission systems, it can stably withstand a radial load of 62kN with a failure rate of less than 0.7%.
- Mining conveyors: Replaced NSK bearings in BHP Iron Ore's conveyors in Australia, reducing operation and maintenance costs by 28% and increasing wear resistance by 20%.
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