IPDB › China Industry › Industrial Equipment & Components › Bearing
Needle Roller Bearings Nkib 5901 Nkib 5904 Nkib 5905 Nkib 5906 Rna 4900 Rna 4901 Rna 4902 Rna 4903 Rna 4904 Rna 4906 Rna 4907 Rna 4908 Rna 4909 Needle Bearing1
Cylindrical Roller Bearing, Needle Roller Bearings, Na Rna Needle Roller Bearings
Shandong UJK Bearing Co., Ltd.
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Product Description UJK NA & RNA Series Needle Roller Bearings: English IntroductionThe UJK NA Series and RNA Series represent precision-engineered machined-ring needle roller bearings designed for applications requiring extreme radial load capacity in minimal radial space. The NA Series features an integrated inner ring, while the RNA Series omits the inner ring, enabling direct rolling contact on a hardened and ground shaft. This design significantly reduces the radial footprint, making it ideal for space-constrained assemblies like gearboxes, automotive transmissions, and industrial machinery135.Key Features & Benefits:Compact Radial DesignRNA Series eliminates the inner ring, reducing radial space by 15-30% compared to standard bearings. The shaft itself acts as the inner raceway, provided it is hardened (HRC ≥58) and precision-ground (Ra ≤0.2 μm)139.NA Series includes a separable inner ring, simplifying installation when shaft hardening is impractical57.Exceptional Load CapacityEngineered to withstand ultra-high radial loads despite minimal cross-sections. The machined rings (hardened chromium steel) and caged needle rollers ensure optimal load distribution5710.Precision and RigidityMachined rings (vs. drawn cups) enhance dimensional stability and running accuracy.RNA Series allows larger shaft diameters, increasing system rigidity39.Versatile ConfigurationsNA Series: Includes inner ring, suited for non-hardened shafts.RNA Series: Requires hardened shaft as raceway; ideal for weight-sensitive designs169.Sealed Options (RS/2RS)Available with single/double seals (e.g., RNA4900RS) pre-lubricated with lithium grease, blocking contaminants in harsh environments29.Typical Applications:Automotive: Transmissions, steering systems.Industrial: Gear pumps, compressors, textile machinery.Power Tools & Agriculture Equipment268. Dimensional Table: UJK NA & RNA SeriesModelInner Diameter (mm)Outer Diameter (mm)Width (mm)Series TypeRNA4900RS142213RNA (No inner ring)RNA4908486222RNA (No inner ring)NA4010508030NA (With inner ring)NA6911558045NA (With inner ring)RNA6911638045RNA (No inner ring)Notes:RNA Series: Shaft must be hardened/ground to serve as the raceway.NA Series: Inner ring included; shaft hardening not mandatory134. Selection GuidanceChoose RNA Series when:Radial space is critical, and the shaft can be hardened/ground to G2 precision (e.g., robotics, compact actuators).Choose NA Series when:Shaft modification is impractical, or frequent disassembly is needed (e.g., modular gearboxes)579.For full technical specifications (e.g., dynamic load ratings, speed limits), refer to manufacturer datasheets or contact UJK directly.
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