71924 ACD/P4ADBD
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71924 ACD/P4ADBD
Basic Information
System of measurement
Metric
Weight
2.3 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
120 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
165 mm
Outside diameter tolerance
-0.004mm to 0
Width
44 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
14.288 mm
Ball quantity
28
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
26775 lbf
Radial static load rating
38925 lbf
Limiting speed
16.25 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Duplex Back-to-Back (DB)
Number of bearings in matched set
2
Universal matching bearing
No (Standard)
Preload
Heavy / Class D
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
In Stock
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71924 ACD/P4ADBD Bearing Product Overview & Core Advantages
The 71924 ACD/P4ADBD is a precision duplex angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. This matched back-to-back (DB) arrangement is preloaded to Heavy / Class D specifications, delivering superior system stiffness and rotational precision. Its primary advantage lies in its ability to handle combined loads—significant radial and thrust loads in both directions—simultaneously. Manufactured to a P4A tolerance class, it is an ideal solution for high-precision, high-rigidity machinery where minimal deflection and runout are critical.
71924 ACD/P4ADBD Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71924 | Basic bearing series and size designation (120mm bore, 165mm OD). |
| AC | Angular Contact design with a 25° contact angle. |
| D | Duplex (Two bearings as a set). |
| P4A | High precision tolerance class, exceeding ABMA Class 7 (ISO Class 4) standards. |
| DB | Back-to-Back mounting arrangement. |
71924 ACD/P4ADBD Bearing Structural Features & Performance Benefits
- Exceptional Rigidity: The duplex back-to-back (DB) configuration with a Heavy preload creates a highly rigid bearing system that effectively resists moment loads and minimizes shaft deflection under operation.
- High Load Capacity: The 25° contact angle and optimized internal geometry enable high radial dynamic load rating of 26,775 lbf and a radial static load rating of 38,925 lbf, making it suitable for applications with significant combined loads.
- Precision & High-Speed Capability: The P4A tolerance class ensures extremely tight dimensional and running accuracy. The lightweight phenolic cage and balanced design contribute to stable operation at high speeds, with a limiting speed of 16,250 rpm.
- Optimized Material Selection: Components made from chrome steel (rings and balls) provide high hardness and durability, ensuring long service life under heavy loads.
71924 ACD/P4ADBD Bearing Typical Application Areas
This bearing is engineered for high-performance applications where precision and rigidity are paramount. Typical uses include:
- Machine Tool Spindles (e.g., for milling, grinding, and turning centers)
- High-speed Precision Spindles in PCB drilling and routing machines
- Rotary tables and indexing heads
- High-frequency High Rigidity motor spindles
- Other precision industrial machinery requiring matched bearing sets
