Product Title: NSK 20TAC47BDF Super Precision Angular Contact Ball Bearing – 20×47×15 mm, Matched Pair
Part Number: 20TAC47BDF
Brand: NSK
Category: Angular Contact Ball Bearings / Precision Spindle Bearings
Condition: New – OEM Certified
Availability: In Stock – Ships Worldwide
The NSK 20TAC47BDF is a super precision angular contact ball bearing designed specifically for high-speed, high-rigidity spindle applications in CNC machinery and automated tooling. With a 20 mm bore, 47 mm outer diameter, and 15 mm width, this matched duplex pair offers outstanding axial and radial load support, making it ideal for machine tool spindles and rotational positioning systems.
Manufactured by NSK, a global leader in motion control, the 20TAC47BDF features contact angles optimized for thrust loading, ultra-low vibration, and high thermal stability, ensuring precise performance under the most demanding conditions.
Duplex Matched Pair (Back-to-Back / DB Arrangement)
Ensures optimal preload and rigidity for ultra-precise spindle positioning.
Super Precision Design
Built to P4/ABEC-7 tolerance standards for minimal runout and superior rotation accuracy.
High-Speed Capability
Engineered for spindle applications with high RPM and rapid acceleration/deceleration.
Robust Axial Load Support
Designed to withstand high axial loads in both directions, perfect for tool holding systems.
Optimized Contact Angle
30° angular contact improves axial stiffness and reduces deformation during high-speed rotation.
| Specification | Value |
|---|---|
| Model | 20TAC47BDF |
| Bearing Type | Angular Contact (Duplex) |
| Inner Diameter (ID) | 20 mm |
| Outer Diameter (OD) | 47 mm |
| Width (Single Bearing) | 15 mm |
| Contact Angle | 30° |
| Precision Class | P4 / ABEC-7 |
| Arrangement | BDF (Back-to-Back Pair) |
| Lubrication | Grease/Oil Compatible |
| Cage Type | Polyamide Resin or Phenolic (varies) |
| Application Fit | Spindles, indexing tables, precision drives |
| Application | Use Case |
|---|---|
| CNC Spindles | Ultra-precise rotary movement |
| Machine Tooling | Load-bearing ends for cutting tools |
| Robotic Joints | High-speed movement with axial force |
| Rotary Tables | Precision indexing and positioning |
✔️ Ultra-High Rigidity – Duplex pairing ensures stability during rapid motion
✔️ High Accuracy Class – Meets the demands of ultra-precise machining
✔️ Reduced Maintenance – Built to withstand wear and minimize vibration over long duty cycles
✔️ OEM Trusted – Used by global machine tool manufacturers for spindle assemblies
Q: What does the BDF in 20TAC47BDF indicate?
A: It refers to a Back-to-Back (DB) duplex pairing, meaning two bearings are matched and preloaded to be used together for better rigidity and axial load support.
Q: Can I use these for high-speed CNC milling?
A: Absolutely. This bearing pair is designed for high-speed spindles and will perform reliably under those conditions.
Q: Does this bearing require lubrication?
A: Yes, it is compatible with oil or grease lubrication systems. Proper lubricant selection depends on speed, load, and thermal factors.
If you need superior axial load capacity, high-speed rotation, and extreme precision for your spindle or CNC application, the NSK 20TAC47BDF angular contact ball bearing delivers. With P4 tolerance and a matched pair configuration, it ensures low runout, maximum rigidity, and long-term reliability under industrial loads.
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