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Help CenterONA OKLDF 100 High Precision Thrust Angular Contact Ball Bearing P4/P2 for CNC Rotary Table
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OKLDF Series – Bidirectional Thrust Angular Contact Ball Bearings
1. Product Overview
The OKLDF series is a high‑precision bidirectional thrust angular contact ball bearing designed for demanding machine tool and rotary table applications. As an integral part of ONA’s precision bearing portfolio, the OKLDF series delivers high rotational accuracy, high rigidity, low friction torque and excellent speed capability – making it an ideal choice for applications where combined loads and precision are required.
2. Structural Design
The OKLDF series features a carefully engineered structure that combines the following key components:
Single‑piece outer ring
Two inner rings (split type)
Two sets of ball and cage assemblies
Contact angle of 60 degrees – twice the standard 30° contact angle of conventional angular contact ball bearings, enabling significantly higher axial load capacity and greater overturning moment rigidity
Both the outer and inner rings are fitted with mounting holes, allowing the bearing to be installed and secured directly onto adjacent machine structures using connecting bolts. The bearings are fixed by the bolts themselves, which simplifies assembly and ensures safe handling during transport, installation and maintenance.
3. Key Performance Characteristics
3.1 High Precision (P4 / P2)
The OKLDF series is manufactured to precision grades P4 and P2 – the highest classification in the ISO/ABMA tolerance system. This ensures minimal rotational runout and exceptional positioning accuracy, making the bearings suitable for high‑end CNC machine tools.
3.2 High Rigidity with Built‑in Preload
All OKLDF bearings are delivered with an integrated preload, which eliminates the need for manual gap adjustment during installation. This preloaded design guarantees high system rigidity under all operating conditions, minimizing deflection and enhancing machining stability.
3.3 60° Contact Angle for Combined Loads
With a 60° contact angle in both directions, the double‑row ball design enables the bearing to simultaneously withstand:
Radial loads
Bidirectional axial loads
Overturning moments
This combined load capability makes the OKLDF series an exceptionally compact solution for rotary axes where multiple load directions occur simultaneously.
3.4 Low Friction, High Speed and Low Temperature Rise
The specially designed brass cage provides higher mechanical strength while maintaining very low starting torque. The 60° contact angle configuration also contributes to:
High limiting rotational speeds – significantly higher than standard thrust ball bearings
Uniformly low friction torque across the entire speed range
Low temperature generation – essential for high‑speed, long‑duration machining
3.5 Sealed Design for Contamination Protection
The OKLDF series is fitted with seals on both sides of the bearing. These seals serve two critical functions:
Prevent ingress of external contaminants such as dust, coolant mist and metal chips
Retain internal grease – preventing lubricant leakage and ensuring consistent lubrication throughout the bearing’s service life
3.6 Optimized Lubrication with Relubrication Capability
The bearings are initially lubricated with a composite barium‑based grease, selected for its high mechanical stability, wide operating temperature range and excellent adhesion to rolling elements. The outer ring features oil holes that allow for grease replenishment without disassembly, extending the bearing’s service life in long‑running or severe‑duty applications.
3.7 Adjustable Preload via Spacer Ring
The split inner ring design includes a spacer ring between the two inner rings. By precisely grinding the spacer ring to the required thickness, the preload level can be adjusted according to the application’s rigidity and speed requirements. This adjustability enables the bearing to be fine‑tuned for the optimum balance between stiffness and temperature rise – a critical requirement in high‑speed precision spindles.
4. Detailed Technical Specifications
The OKLDF series is available in a comprehensive range of standard sizes covering inner diameters from 100 mm to 580 mm, with custom sizes available upon request. The table below summarizes the key dimensions and performance parameters for the standard models:
Selection guide:
OKLDF – Choose for applications requiring high speed + low friction + high precision + moderate combined loads
YRT – Choose for applications requiring maximum rigidity + heavy combined loads, where speed is not the primary concern
ORTS – Choose for direct‑drive motor applications where very low friction torque at high speed is critical
6. Application Fields
The OKLDF series is widely used across a broad spectrum of high‑precision industries, including:
| Application Field | Specific Use Cases | Why OKLDF is Suitable |
|---|---|---|
| Machine Tool Rotary Tables | 4th/5th‑axis CNC rotary tables, dividing heads, index tables | High rotational accuracy (P4/P2) ensures precise angular positioning; 60° contact angle handles both axial workpiece weight and radial cutting forces simultaneously |
| Grinding Spindles | High‑speed grinding heads for ID/OD grinding machines, surface grinders, honing spindles | Low friction and low temperature rise enable long‑duration grinding operations; seals protect against abrasive dust |
| Testing & Measurement Equipment | Precision rotary stages for coordinate measuring machines (CMMs), optical inspection systems, gear testers | Extremely low starting torque ensures smooth motion without stick‑slip; high precision (P4/P2) ensures measurement repeatability |
| Machine Tool Spindles | Main and auxiliary spindles for milling, turning, drilling and boring operations | Combines high speed with ability to withstand bidirectional axial loads and moderate radial loads |
| Aerospace & Defense | Precision rotary actuators, antenna positioning systems, weapon aiming systems | High reliability under demanding conditions; wide operating temperature range |
| Medical Devices | CT scanner gantries, surgical robot joints, dental milling spindles | Low noise and vibration characteristics; high precision |
| Industrial Robotics | Wrist joints and rotary axes of articulated robots | High rigidity and low friction enable precise motion control |
| Automation Equipment | Rotary indexers for assembly lines, cam indexers, pick‑and‑place turrets | Long‑term reliability with minimal maintenance |
7. Summary of Key Advantages
P4/P2 accuracy grade – meets the highest standards for positioning precision in CNC machinery
60° contact angle with double‑row ball design – enables simultaneous support of radial, axial and overturning loads
Pre‑loaded design – eliminates need for on‑site gap adjustment; guarantees high system rigidity
Low friction torque – reduces power consumption and heat generation; enables higher operational speeds
Seals on both sides – protects against contamination; retains lubricant; extends service life
Relubrication capability – oil holes in the outer ring allow grease replenishment without disassembly
Adjustable preload via spacer ring – allows fine‑tuning of rigidity vs. temperature characteristics
Complete model range – from 100 mm to 580 mm bore diameter, with custom sizes available on request
Easy bolt‑on installation – mounting holes on both rings eliminate need for complex housing designs
Composite barium‑based grease – provides excellent thermal stability, mechanical stability and corrosion protection
8. Available Standard Models
The OKLDF series is available in the following standard sizes (ONA models OKLDF100 through OKLDF580). Custom sizes and non‑standard configurations can be supplied upon request – please contact our engineering team for specific dimension and parameter information.
OKLDF100
OKLDF120
OKLDF150
OKLDF200
OKLDF260
OKLDF325
OKLDF395
OKLDF460
OKLDF580
OKLDF – Precision, speed and rigidity – the reliable choice for high‑performance rotary axes.
ONA – Precision by Design
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