71907 ACEGA/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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71907 ACEGA/P4A Bearing Product Overview & Core Advantages
The 71907 ACEGA/P4A is a high-precision angular contact ball bearing designed for applications demanding exceptional accuracy and performance. Engineered with an Extra Light (Class A) preload and manufactured to P4A tolerance class, this bearing delivers superior running accuracy, high rigidity, and reliable operation. Its 25° contact angle is optimized to handle combined radial and axial loads simultaneously, making it an ideal choice for high-speed spindles and precision machinery where rotational stability is critical.
71907 ACEGA/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71907 | Basic bearing series and size designation (35mm bore, 55mm OD, 10mm width) |
| AC | Angular Contact design with a 25° contact angle |
| E | Optimized internal design for enhanced performance |
| GA | Universal Matchable (SU) bearing supplied in a matched set of 2 with specific pre-load |
| P4A | High precision tolerance class exceeding ABEC 7 standards |
71907 ACEGA/P4A Bearing Structural Features & Performance Benefits
High Precision & Rigidity: Manufactured to P4A tolerance class with extremely tight dimensional tolerances (bore/OD tolerance: -0.004mm to 0), ensuring minimal runout and vibration for superior rotational accuracy. The Extra Light preload (Class A) provides optimal stiffness without excessive friction or heat generation.
Optimized Speed Performance: Features a phenolic resin cage that reduces centrifugal forces and friction, contributing to a high limiting speed of 56,000 rpm. The balanced internal geometry and 19 high-grade chrome steel balls ensure smooth operation at high velocities.
Superior Load Capacity: The 25° contact angle design enables the bearing to efficiently support combined radial and axial loads. With a dynamic load rating of 1638 lbf and a static load rating of 990 lbf, it offers reliable performance under demanding conditions.
Universal Matching Capability: As a Universal Matchable (SU) bearing supplied in a pre-matched set, it simplifies installation and ensures precise preload and performance when used in pairs (back-to-back or face-to-face arrangements).
71907 ACEGA/P4A Bearing Typical Application Areas
- Machine Tool Spindles: High-speed machining centers, grinding spindles, and CNC milling machines
- Precision Instrumentation: Measuring equipment, optical scanners, and coordinate measuring machines
- High-Speed Drives: Electric motor spindles, turbochargers, and small precision gearboxes
- Aerospace & Defense: Gyroscopes, navigation systems, and auxiliary power units (APUs)
