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Double Row Cylindrical Roller Bearings Nn3068K/W33 Nn3072K/W33 Nn3076K/W33 Nn3088K/W33 Nn3092K/W33 Nn3096K/W33 Nn3006K/W33 Nn3007K/W33 Nn3008K/W331
Cylindrical Roller Bearing, Double Row Cylindrical Roller Bearings, Cylindrical Roller Bearings
Shandong UJK Bearing Co., Ltd.
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Product Description Product Description Product Overview: UJK Double-Row Cylindrical Roller BearingPrecision Radial Load Solutions for Rigid Shaft GuidanceThe UJK Double-Row Cylindrical Roller Bearing delivers exceptional radial load capacity and rigidity in compact designs. Engineered for precision applications requiring minimal axial space and maximum rotational accuracy, these bearings feature optimized roller profiles and premium materials for superior performance in high-speed, high-load industrial environments. Key Features & Benefits Ultra-High Radial Load CapacityTwo rows of precision-ground cylindrical rollers30-40% higher radial load rating vs. single-row designs Precision Running AccuracyUJK-grade tolerances (ISO P6/P5 classes available)Minimal radial runout (±0.005 mm typical) Space-Saving DesignCompact width vs. two single-row bearingsIntegrated rib guidance for axial positioning UJK Performance EnhancementsNitrided steel cages for high-speed stability (up to 5,000 rpm)Super-finished raceways reduce friction and noiseHigh-purity chromium steel (HRC 60-64 hardness) Model & Dimension Specifications (Typical UJK Series)Modeld (mm)D (mm)B (mm)Dynamic Load (kN)Static Load (kN)Speed Limit (rpm)UJK NN30084068381101258,000UJK NN301680125482503006,300UJK NN3030150225726507804,000UJK NNU4940200280859001,1003,800UJK NNU49683404601402,4002,9002,400Notes:d = Bore Diameter ? D = Outer Diameter ? B = WidthNN = Double-row with inner ring ribs ? NNU = Double-row with outer ring ribs Design Variations & SuffixesSuffixFeatureTechnical ImpactKTapered bore (1:12)Adapter sleeve mountingP4Ultra-precision grade≤ 50% runout of P5 classMBrass cageHigh-speed capability (↑30% rpm limit)C3Increased radial clearanceThermal expansion compensationW33Lubrication groove + holesForced oil systemsS1Stabilized heat treatment≤ +200°C operating temp Technical Highlights Internal Design Options:NN Design: Ribs on inner ring (outer ring separable)NNU Design: Ribs on outer ring (inner ring separable)Full complement rollers: For extreme radial loads (suffix V) Mounting Criticals:Requires precise alignment (no self-aligning capability)Housing bore tolerance: H7/J7Shaft tolerance: k5/m6 Lubrication Systems:Oil mist: Recommended for >4,000 rpmGrease: Lithium complex (NLGI 2) with relubrication ports Typical ApplicationsMachine tool spindles: Lathe heads, grinding wheel shaftsGearbox support bearings: Wind turbine gear stagesRolling mill backup rolls: Precision strip processingPrinting machinery: Impression cylinder journalsMedical equipment: MRI gantry rotation systems Why Choose UJK Double-Row Cylindrical Rollers?*"UJK bearings achieve 40% higher rigidity than competitive designs through:? Optimized logarithmic roller profiles? Raceway crowning ≤ 0.002xD? Cage-guided roller alignmentResulting in 3-5 dB noise reduction and 20% longer service life in precision spindle applications."*
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