China Suppliers Factory for Thrust Angular Contact Ball Bearings - High Axial Stiffness & Speed Performance
Key Features
1 Design and Structure
- Consist of a shaft washer (tight fit to the shaft), a housing washer, and a ball and cage assembly.
- Non-separable design for enhanced structural integrity.
- Asymmetric raceways optimized for axial load transmission while managing radial components.
2 Load Capacity
- Primarily withstand unidirectional axial loads.
- Can accommodate limited radial loads (typically ≤ 20% of axial load capacity).
- High axial rigidity due to the large contact angle (e.g., 60°).
3 Precision and Tolerance
- Manufactured to high-precision grades (P4, P2, or SP/UP for machine tool applications).
- Low noise and vibration levels, suitable for high-precision machinery.
4 Cages
- Glass fiber-reinforced polyamide 66 (suffix TN).
- Machined brass cages (suffix M).
- Stamped steel cages for high-temperature applications.
5 Lubrication
- Pre-lubricated with high-performance grease for lifelong operation (e.g., Krytox® for extreme temperatures).
- Options for oil lubrication in high-speed scenarios.
6 Applications
- Machine tool spindles (e.g., CNC milling machines).
- High-speed robotic systems.
- Aerospace actuators.
- Medical equipment (e.g., MRI scanners).
Technical Specifications
Contact Angle
60° (optimized for axial load)
Tolerance Grades
P0 (standard), P6, P5, P4, P2
Operating Temperature
-30°C to +150°C (depending on cage and lubricant)
Speed Rating
Up to 1.2 million dn value (with oil lubrication)
Installation Notes
- Must be preloaded (e.g., with springs or matched sets) to eliminate internal clearance.
- Strict alignment required (no self-aligning capability).
- Paired configurations (O or X arrangements) for bidirectional axial load support.
Advantages
Superior axial rigidity compared to standard thrust bearings.
High-speed capability with minimal heat generation.
Extended service life under heavy axial loads.
Frequently Asked Questions
Q
What is the maximum radial load these bearings can handle?
These bearings are primarily designed for axial loads. They can accommodate limited radial loads, typically no more than 20% of the rated axial load capacity. Exceeding this limit may reduce bearing life and performance.
Q
What precision grades are available and which is recommended for CNC spindles?
Available grades include P0 (standard), P6, P5, P4, and P2. For CNC machine tool spindles and other high-precision applications, P4 or P2 grades are recommended, as they offer the tightest tolerances and lowest runout.
Q
Do these bearings require preloading during installation?
Yes, preloading is mandatory. These bearings must be preloaded — using springs or matched bearing sets — to eliminate internal clearance and ensure proper axial rigidity. Operating without preload can cause vibration and premature failure.
Q
What lubrication options are available, and how do I choose?
Bearings come pre-lubricated with high-performance grease suitable for most applications. For extreme temperature environments, Krytox® grease is recommended. For very high-speed applications, oil lubrication is preferred as it provides better cooling and can support dn values up to 1.2 million.
Q
Can these bearings support bidirectional axial loads?
A single bearing only supports unidirectional axial loads. To handle bidirectional axial loads, bearings must be installed in paired configurations — either face-to-face (O arrangement) or back-to-back (X arrangement).
Q
What is the operating temperature range and which cage material suits high-temperature use?
The standard operating temperature range is -30°C to +150°C, depending on the cage material and lubricant used. For high-temperature environments, stamped steel cages are the recommended choice, as they outperform polyamide or brass cages under elevated heat conditions.