71907 ACD/P4AQBTB
71900 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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71907 ACD/P4AQBTB Bearing Product Overview & Core Advantages
The 71907 ACD/P4AQBTB is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and rigidity. This metric bearing features a matched quadruplex tandem back-to-back (QBT) arrangement, delivering superior axial and radial load capacity in a compact design. Its P4A tolerance class ensures ultra-precision operation, making it ideal for high-speed spindles and precision machinery where uncompromising performance and reliability are critical.
71907 ACD/P4AQBTB Bearing Model Code Explained, Specifications & Naming Convention
| 71907 | Basic designation: 35mm bore, 55mm OD, 40mm width |
| ACD | Angular Contact Design with 25° contact angle |
| P4A | Ultra-precision tolerance class (superior to ABEC 7) |
| QBTB | Quadruplex Tandem Back-to-Back matched arrangement |
71907 ACD/P4AQBTB Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The quadruplex tandem back-to-back configuration provides exceptional system stiffness, enabling superior performance under combined radial and axial loads. This arrangement significantly enhances moment load capacity compared to single bearings.
Precision Performance: Manufactured to P4A tolerance class with tight dimensional controls (bore/OD tolerance: -0.004mm to 0), ensuring minimal runout and vibration for high-speed applications up to 56,000 rpm.
Optimized Material Selection: The phenolic cage material offers excellent strength-to-weight ratio and smooth operation at high speeds, while chrome steel construction throughout provides durability and long service life.
Light Preload (Class B): Factory-set preload eliminates internal clearance, delivering immediate precision and stability without requiring additional adjustment during installation.
71907 ACD/P4AQBTB Bearing Typical Application Areas
- Machine Tool Spindles: High-speed machining centers, grinding spindles
- Precision Robotics: Articulated arm joints, rotary tables
- Aerospace Systems: Gyroscopes, navigation instruments
- Medical Equipment: High-speed dental handpieces, surgical tools
- Semiconductor Manufacturing: Wafer handling robots, precision positioning stages
