71820 ACD/HCP4
Hybrid Ceramic Super Precision Bearings
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71820 ACD/HCP4 Bearing Product Overview & Core Advantages
The 71820 ACD/HCP4 is a single-row angular contact ball bearing engineered for high-precision applications requiring exceptional rotational accuracy and speed capability. Its defining feature is the 25° contact angle, optimized to support significant combined loads—handling both radial and axial forces simultaneously with high efficiency. Manufactured to P4 (ABEC-7) tolerance class, this bearing ensures minimal runout and superior dimensional stability. The combination of a ceramic ball material and phenolic cage enables outstanding high-speed performance and reduced rotating mass, while the availability of preload options allows for enhanced system rigidity and precise shaft positioning in demanding machinery.
71820 ACD/HCP4 Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71820 | Basic bearing designation indicating a metric, single-row angular contact ball bearing with a 100 mm bore, 125 mm OD, and 13 mm width. |
| AC | Angular Contact design with a 25° contact angle. |
| D | Signifies a high ball complement (34 balls), increasing the load capacity. |
| HC | Indicates the use of Hybrid Ceramic balls (ceramic balls with steel rings), offering benefits like reduced weight, lower friction, and extended service life at high speeds. |
| P4 | Denotes the P4 tolerance class (equivalent to ABEC-7), representing very high precision and tight dimensional control for critical applications. |
71820 ACD/HCP4 Bearing Structural Features & Performance Benefits
- Optimized Contact Angle & High Rigidity: The 25° contact angle is specifically chosen to provide an excellent balance between radial and axial load carrying capacity. This design, combined with the availability of preload, results in a very high rigidity system, minimizing deflection under load.
- Hybrid Ceramic Construction: The use of ceramic balls with steel rings reduces centrifugal forces, lowers operating temperature, and allows for a higher limiting speed (15,000 rpm). This construction also offers superior resistance to wear and electrical arcing.
- Phenolic Cage for High-Speed Performance: The lightweight phenolic cage ensures stable operation at very high rotational speeds. Its self-lubricating properties contribute to smooth performance and are well-suited for the specified temperature range.
- Precision & Load Ratings: Manufactured to P4 tolerance, this bearing guarantees precise running accuracy. The high ball count (34 balls) directly contributes to its substantial dynamic and static load ratings (4770 lbf / 6188 lbf), making it suitable for demanding combined load conditions.
71820 ACD/HCP4 Bearing Typical Application Areas
- High-Speed Machine Tool Spindles
- Precision Grinding & Milling Applications
- High-Frequency Electric Motors & Spindles
- Aerospace & Defense Actuation Systems
- Medical & Dental High-Speed Handpieces
- Semiconductor Manufacturing Equipment
