7028 CDGB/P4A
7000 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
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7028 CDGB/P4A Bearing Product Overview & Core Advantages
The 7028 CDGB/P4A is a single-row angular contact ball bearing engineered for high-precision applications requiring exceptional rotational accuracy and rigidity. Designed to accommodate primarily axial loads in one direction, combined with radial loads, it features a 15° contact angle and P4A super-precision tolerance class, ensuring minimal runout and vibration. Its universal matching (SU) capability allows for flexible mounting in preloaded sets to achieve optimal system stiffness. The phenolic cage and high-grade chrome steel construction contribute to its high-speed performance and durability in demanding environments.
7028 CDGB/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7028 | Basic bearing series; 140 mm bore, 210 mm OD, 33 mm width |
| CD | Contact angle designation (15°) |
| GB | Universal Matchable bearing (can be paired in any combination) |
| P4A | Super precision tolerance class (superior to ABEC 7) |
7028 CDGB/P4A Bearing Structural Features & Performance Benefits
- High Rigidity & Precision: Manufactured to P4A tolerance standards with extremely tight dimensional control (bore/OD tolerance: -0.004mm to 0), ensuring precise shaft positioning and minimal deflection under load.
- Optimized Load Capacity: The 15° contact angle provides excellent axial load capacity in one direction while maintaining substantial radial load capability (Dynamic: 34,425 lbf, Static: 37,350 lbf).
- Superior High-Speed Performance: The phenolic resin cage offers low friction, high strength, and excellent acceleration characteristics, supporting a limiting speed of 6,300 rpm.
- Universal Matching Capability: As a Universal Matchable (SU) bearing, it can be mounted in preloaded sets (typically 3 bearings) without selective assembly, simplifying installation and enhancing system stiffness.
- Premium Material Construction: Made from chrome steel for rings and balls, providing high wear resistance and long service life in precision applications.
7028 CDGB/P4A Bearing Typical Application Areas
- Machine Tool Spindles - High-speed milling, grinding, and turning centers
- Precision Gearboxes - Industrial robotics and automation systems
- High-Frequency Motors - Spindle drives and servo motors
- Medical Equipment - CT scanners and dental drill handpieces
- Aerospace Systems - Gyroscopes and navigation instruments
