71920 ACD/P4AQBCD
71900 Series Super Precision Angular Contact Ball Bearings
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71920 ACD/P4AQBCD Bearing Product Overview & Core Advantages
The 71920 ACD/P4AQBCD is a precision quadruplex angular contact ball bearing designed for applications demanding exceptional rigidity and load capacity. This metric system bearing features a heavy preload (Class D) and is supplied as a matched set of four bearings in a back-to-back (QBC) arrangement. Its primary advantage lies in its ability to handle significant combined loads (radial and axial) simultaneously while providing high rotational accuracy and stability, making it ideal for high-precision, high-stiffness machinery.
Model Code Deep Explanation
| Code Segment | Technical Meaning |
|---|---|
| 71920 | Basic bearing series and size designation |
| AC | Angular Contact design with a 25° contact angle |
| D | Heavy preload (Class D) for maximum rigidity |
| P4A | High precision tolerance class (equivalent to ABEC 7) |
| QBC | Quadruplex Back-to-Back matched arrangement |
| D | Duplex bearing designation within the matched set |
71920 ACD/P4AQBCD Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The quadruplex back-to-back arrangement creates an extremely rigid bearing system capable of withstanding heavy combined loads. With a radial dynamic load rating of 33,975 lbf and static load rating of 56,250 lbf, this bearing delivers exceptional performance under demanding conditions.
Precision Performance: Manufactured to P4A tolerance class, this bearing ensures minimal runout and high rotational accuracy. The 25° contact angle optimizes axial load capacity while maintaining good radial performance.
Advanced Materials: Constructed with chrome steel rings and balls for durability and fatigue resistance. The phenolic cage provides excellent strength-to-weight ratio and smooth operation at the limiting speed of 15,000 rpm.
Optimized Design: Featuring 26 balls of 12.7 mm diameter, the bearing achieves optimal load distribution. The pre-lubricated design with tight dimensional tolerances (bore and OD tolerance: -0.004mm to 0) ensures consistent performance.
71920 ACD/P4AQBCD Bearing Typical Application Areas
This high-precision quadruplex bearing is specifically designed for applications requiring maximum stiffness and accuracy:
- Machine tool spindles for high-speed milling and grinding operations
- Precision rotary tables and indexing heads
- High-speed machining centers requiring extreme rigidity
- Aerospace positioning systems and guidance mechanisms
- Medical equipment spindles for precision manufacturing
- Robotic arm joints requiring high moment load capacity
