IKO Roller Bearings
Product Overview IKO roller bearings represent precision-engineered solutions for high-load, high-speed applications requiring exceptional durability and rotational accuracy. As a leading Japanese manufacturer, IKO specializes in needle roller and cylindrical roller bearing technologies that deliver superior performance in compact designs.
Core Product Lines
2.1 IKO Roller Bearings
Design: Utilize rollers with L/D ratio ≥3:1 (diameter ≤6mm)
Series:
RNA (caged type): 3,500 N/mm² static load capacity
HK/BK (drawn cup): 0.3mm ultra-thin wall thickness
CF (cam followers): Integrated stud shafts
Features:
30-40% more rollers than conventional designs
Logarithmic crowning profiles
ISO P5 to P2 precision grades
2.2 IKO Roller Bearings
Design: Full complement or caged designs
Series:
CRB (crossed roller): Handles combined loads
NUP/NJ (single/double flange): Axial displacement control
Features:
500-2,000 N/μm radial stiffness
≤1μm runout (precision models)
Technical Specifications
3.1 Dimensional Parameters
Bore Sizes: 3mm to 400mm
Width Series: Extra-light (EL) to extra-wide (EW)
Tolerances:
ABEC 1 (ISO Normal) to ABEC 9 (ISO P2)
Radial clearance: C2 to C4 groups
3.2 Performance Data
Load Capacity:
Dynamic: 5.8-1,250 kN
Static: 9.8-2,040 kN
Speed Limits:
Grease: 15,000-40,000 rpm
Oil: 25,000-60,000 rpm
Friction: μ=0.001-0.0035
Material Technology
4.1 Metallurgy
Rollers:
SUJ2 (AISI 52100 equivalent)
HV700-900 hardness
Ceramic options (Si₃N₄)
Rings:
Case-carburized SCM420
0.8-1.2mm hardening depth
4.2 Surface Treatments
Phosphate coating (0.003-0.007mm)
Black oxide (Fe₃O₄)
DLC coating (μ=0.05)
Precision Engineering
5.1 Manufacturing Tolerances
Roundness: ≤0.5μm (ultra-precision)
Surface Finish: Ra ≤0.05μm
Roller Sorting: ±0.2μm diameter grouping
5.2 Cage Technology
Steel (ST): High-speed capability
Polyamide (TV): Reduced friction
Brass (MA): High-temperature stability
Lubrication Systems
6.1 Grease Options
Standard: Lithium complex (120°C limit)
*High-Temp*: PFPE-based (250°C limit)
Solid Film: MoS₂ coating
6.2 Relubrication
Interval: L₁₀ life × 0.7
Quantity: Q=0.02×D×B (grams)
Application Solutions
7.1 Automotive
Transmission bearings (690 MPa stress rating)
Rocker arm pivots (200M cycle life)
7.2 Industrial
Robot reducers (≤1 arc-min backlash)
Machine tool spindles (P4S precision)
7.3 Aerospace
AMS 6444 compliant
200°C continuous operation
Mounting Guidelines
8.1 Shaft/Housing Fits
Shaft: k5/m5 for rotation
Housing: H7 for static rings
Press Force: F=L×d×δ×E×10⁻³ (N)
8.2 Alignment Requirements
≤0.02mm/100mm parallelism
≤0.5° angular misalignment
Quality Assurance
9.1 Testing Protocols
100% dimensional verification (CMM)
Vibration analysis (ISO 15242)
Accelerated life testing
9.2 Certifications
IATF 16949 (automotive)
AS9100D (aerospace)
ISO 14001 (environmental)
Special Features
10.1 Customization
Non-standard bore/OD combinations
Sensor integration (temperature/strain)
Special coatings (TiN, WC/C)
10.2 Smart Bearings
Embedded RFID tags
Wireless condition monitoring
Lot connectivity options
Technical Advantages
40% higher load density vs competitors
60% space savings vs tapered rollers
5-year industrial warranty
Global technical support network
