The NSK 20TAC47BDF super precision angular contact ball bearing is engineered for high speed and high rigidity spindle applications used in CNC machines and precision automation systems. This bearing is supplied as a matched duplex pair, allowing precise preload and enhanced stiffness in machine tool spindle assemblies.
With a 20 mm inner diameter, 47 mm outer diameter, and 15 mm width, the bearing is designed to support both axial and radial loads while maintaining high rotational accuracy. The 30° contact angle improves axial load capacity and enhances structural stability during high speed rotation.
Manufactured by NSK, the bearing meets super precision tolerance standards suitable for applications where minimal vibration, low runout, and thermal stability are essential.
NSK
20TAC47BDF
Angular Contact Ball Bearings
Precision Spindle Bearings
New OEM Certified
In Stock with worldwide shipping available
The bearing is supplied as a BDF matched pair, allowing installation in a back to back arrangement that improves axial rigidity and positional accuracy.
Manufactured to P4 or ABEC-7 precision class, enabling extremely low runout and high rotational accuracy in precision machinery.
Designed for applications where spindle shafts operate at high rotational speeds with frequent acceleration and deceleration cycles.
The 30° contact angle increases axial stiffness and allows the bearing to support higher thrust loads.
Precision manufacturing and optimized internal geometry reduce heat generation during high speed operation.
| Specification | Value |
|---|---|
| Model | 20TAC47BDF |
| Bearing Type | Angular Contact Ball Bearing |
| Arrangement | Duplex Matched Pair (BDF) |
| Inner Diameter | 20 mm |
| Outer Diameter | 47 mm |
| Width | 15 mm per bearing |
| Contact Angle | 30° |
| Precision Class | P4 / ABEC-7 |
| Lubrication | Oil or Grease Compatible |
| Cage Type | Polyamide Resin or Phenolic |
| Application | CNC Spindles and Precision Drives |
Angular contact ball bearings support combined radial and axial loads while maintaining precise rotational motion.
In operation:
Rolling elements move between the inner and outer raceways.
The contact angle directs load through the bearing at a defined angle.
Duplex mounting improves rigidity and distributes loads evenly.
This configuration is widely used in machine tool spindle assemblies that require high positioning accuracy.
Used in spindle assemblies where high rotational speed and precise positioning are required for machining operations.
Installed at tool holding ends to support axial forces generated during cutting processes.
Used in robotic joints where controlled rotation and load stability are required.
Supports indexing tables that require accurate rotational positioning.
The BDF configuration is designed for back to back mounting, providing high rigidity and improved load distribution.
Correct preload settings are important to maintain precision and prevent vibration during operation.
The bearing can operate with grease or oil lubrication, depending on spindle speed and operating temperature.
Manufactured to super precision tolerance standards suitable for machine tool spindles.
Duplex pairing increases stiffness and load handling capacity.
Optimized internal geometry reduces vibration and heat generation.
Designed for continuous operation in precision machining environments.
BDF refers to a matched duplex pair arranged in a back to back configuration, allowing higher rigidity and improved axial load support.
Yes. The bearing is specifically designed for high speed spindle applications commonly used in CNC milling and machining centers.
The bearing supports both oil and grease lubrication systems, depending on machine design and operating speed.
NSK 20TAC47BDF super precision angular contact ball bearing matched pair
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