71915 ACD/P4ADBB
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71915 ACD/P4ADBB
Basic Information
System of measurement
Metric
Weight
0.7 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
75 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
105 mm
Outside diameter tolerance
-0.004mm to 0
Width
32 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
9.525 mm
Ball quantity
26
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
12442 lbf
Radial static load rating
15975 lbf
Limiting speed
22 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
Light / Class B
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
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71915 ACD/P4ADBB Bearing Product Overview & Core Advantages
The 71915 ACD/P4ADBB is a precision angular contact ball bearing supplied as a duplex back-to-back (DB) matched set. Engineered for applications demanding exceptional rotational accuracy and rigidity, this bearing is preloaded to Light / Class B specifications, ensuring minimal axial and radial play under operating conditions. Its P4A tolerance class guarantees superior dimensional and running accuracy, making it ideal for high-precision, high-speed spindles and machinery. The duplex DB arrangement provides high rigidity and excellent capability to withstand combined loads (radial and axial), offering stable performance in demanding operational environments.
71915 ACD/P4ADBB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71915 | Basic bearing designation, indicating a high-precision angular contact bearing series with a 75 mm bore diameter. |
| AC | Angular Contact design with a 25° contact angle, optimized for carrying combined loads. |
| D | Duplex (two bearings supplied as a set). |
| P4A | High precision tolerance class, exceeding ABEC 7 standards, ensuring extremely tight dimensional and running accuracy. |
| DB | Matched arrangement: Back-to-Back. This configuration provides high moment rigidity and excellent stability. |
| B | Specifies the Light preload applied to the matched set. |
71915 ACD/P4ADBB Bearing Structural Features & Performance Benefits
- High Rigidity and Stability: The duplex back-to-back (DB) arrangement creates a wide effective spread between the load centers, significantly increasing the bearing's resistance to moment loads and providing exceptional system rigidity.
- Superior Load Capacity: The 25° contact angle and duplex design enable the bearing to efficiently handle significant combined radial and axial loads simultaneously.
- Optimized High-Speed Performance: The lightweight phenolic cage minimizes centrifugal forces, reduces friction, and contributes to a high limiting speed of 22,000 rpm. The open design allows for efficient lubrication management.
- Precision Engineering: Manufactured to P4A tolerance class with extremely tight bore, outside diameter, and width tolerances, this bearing ensures precise shaft positioning, reduced vibration, and smooth operation essential for high-speed applications.
- Durable Construction: Components made from chrome steel provide high hardness, wear resistance, and long service life under demanding conditions.
71915 ACD/P4ADBB Bearing Typical Application Areas
This precision bearing is ideally suited for high-performance applications requiring high speed, rigidity, and accuracy, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: Used in PCB drilling, engraving, and other high-precision machining equipment.
- High-Frequency Motors: Spindles for routers and other high-RPM electric motors.
- Medical Equipment: High-speed centrifuges and dental handpieces.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and other precision instrumentation.
