71826 ACD/P4QBCB
71800 Series Super Precision Angular Contact Ball Bearings
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71826 ACD/P4QBCB Bearing Product Overview & Core Advantages
The 71826 ACD/P4QBCB is a precision quadruplex angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. This P4 tolerance class bearing features a back-to-back (QBC) matched arrangement of four bearings, enabling it to withstand combined radial and axial loads from multiple directions simultaneously. Its light preload (Class B) ensures minimal deflection under operational stresses, making it ideal for high-precision, high-stiffness systems. The phenolic cage and optimized 25° contact angle contribute to superior high-speed performance and operational stability.
71826 ACD/P4QBCB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71826 | Basic bearing designation indicating bore diameter (130 mm) and standard dimensions |
| ACD | Angular Contact Design with 25° contact angle for optimal axial load capacity |
| P4 | High precision tolerance class ensuring minimal dimensional variations |
| QBC | Quadruplex Back-to-Back arrangement providing maximum rigidity and moment load capacity |
71826 ACD/P4QBCB Bearing Structural Features & Performance Benefits
Enhanced Rigidity & Load Distribution: The quadruplex back-to-back configuration creates an exceptionally rigid bearing system that effectively distributes combined loads across all four bearing units. This arrangement significantly increases system stiffness and moment load capacity.
High-Speed Capability: The phenolic resin cage provides excellent strength-to-weight ratio, reducing centrifugal forces and enabling stable operation at limiting speeds up to 11,000 rpm. The optimized 25° contact angle balances radial and axial load capacity while maintaining high-speed performance.
Precision Performance: Manufactured to P4 tolerance class with tight dimensional controls (bore and OD tolerance: -0.004mm to 0), ensuring precise running accuracy and minimal vibration in critical applications.
Superior Load Ratings: With a dynamic radial load rating of 21,938 lbf and static radial load rating of 45,000 lbf, this bearing delivers exceptional durability and long service life under demanding operating conditions.
71826 ACD/P4QBCB Bearing Typical Application Areas
- Machine Tool Spindles: High-precision milling, grinding, and turning centers requiring extreme rigidity and accuracy
- Precision Gearboxes: Industrial transmission systems demanding high load capacity and minimal deflection
- Robotic Systems: High-accuracy robotic arms and automation equipment needing precise motion control
- Aerospace Components: Flight control systems and auxiliary power units requiring reliable performance
- Medical Equipment: High-speed medical scanners and precision diagnostic instruments
- Test & Measurement Systems: Precision rotary tables and coordinate measuring machines
