71817 ACD/P4DBA
71800 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71817 ACD/P4DBA
Basic Information
System of measurement
Metric
Weight
0.53 kg
Tolerance class
P4
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
85 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
110 mm
Outside diameter tolerance
-0.004mm to 0
Width
26 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
7.144 mm
Ball quantity
30
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
7470 lbf
Radial static load rating
10800 lbf
Limiting speed
28 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
Extra light / Class A
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
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In Stock
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71817 ACD/P4DBA Bearing Product Overview & Core Advantages
The 71817 ACD/P4DBA is a precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. This duplex back-to-back (DB) matched set is manufactured to P4 tolerance class, ensuring superior running accuracy. Its primary advantage lies in its ability to accommodate combined loads—significant radial and axial loads in both directions—simultaneously, making it ideal for high-precision, high-stiffness systems. The pre-configured extra light preload (Class A) minimizes deflection under load, enhances system rigidity, and ensures precise shaft positioning right from installation.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 71817 | Basic bearing designation, indicating a metric series angular contact ball bearing. |
| AC | Angular Contact design with a 25° contact angle. |
| D | Duplex arrangement. In this context, it signifies a matched set of two bearings. |
| P4 | Indicates a high-precision tolerance class for exceptional dimensional and running accuracy. |
| DB | Specifics the Back-to-Back (DB) mounting arrangement of the duplex pair. |
| A | Denotes an Extra Light Preload (Class A) applied to the matched set. |
71817 ACD/P4DBA Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The duplex back-to-back (DB) configuration creates a wide, rigid support system that effectively resists overturning moments and accommodates heavy combined radial and axial loads from both directions. The 25° contact angle is optimized for high axial load capacity.
- Precision Performance: Manufactured to P4 tolerance class with tight dimensional controls on bore, outside diameter, and width, this bearing ensures minimal runout and vibration for superior operational smoothness.
- Optimized for High Speeds: The lightweight phenolic resin cage reduces centrifugal forces, minimizes friction, and contributes to a high limiting speed of 28,000 rpm. The bearing is supplied lubricated for immediate operation.
- Durable Construction: Components made from chrome steel (rings and balls) provide high fatigue life and wear resistance, ensuring long-term reliability in demanding conditions.
71817 ACD/P4DBA Bearing Typical Application Areas
This precision bearing is engineered for high-performance applications, including:
- Machine Tool Spindles: For high-speed milling, grinding, and turning centers where rigidity and accuracy are paramount.
- Precision Gearboxes: Supporting shafts subjected to complex load conditions in industrial robotics and automation.
- High-Frequency Spindles: Used in PCB drilling, dental handpieces, and other applications requiring very high rotational speeds.
- Pumps and Compressors: Where reliable performance under combined loads is essential.
