71913 CD/P4ADBA
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71913 CD/P4ADBA
Basic Information
System of measurement
Metric
Weight
0.42 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
65 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
90 mm
Outside diameter tolerance
-0.004mm to 0
Width
26 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
7.938 mm
Ball quantity
26
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
7470 lbf
Radial static load rating
7538 lbf
Limiting speed
31 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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71913 CD/P4ADBA Bearing Product Overview & Core Advantages
The 71913 CD/P4ADBA is a duplex back-to-back (DB) matched pair of precision angular contact ball bearings. Engineered to the exacting P4A tolerance class, this set is designed for applications demanding extremely high running accuracy and rigidity. Its primary advantage lies in its ability to handle combined radial and axial loads from both directions simultaneously, making it an ideal solution for high-precision spindles and other critical machinery components requiring superior rotational stability.
71913 CD/P4ADBA Bearing Model Code Explained, Specifications & Naming Convention
| Suffix | Technical Meaning |
|---|---|
| CD | Indicates a duplex pair in a back-to-back (DB) arrangement. This configuration provides high moment stiffness and is optimal for supporting overturning moments. |
| P4A | Specifies the tolerance class, denoting very high precision levels for both dimensional and running accuracy, exceeding standard ABEC 7 (P4) specifications. |
| DB | (Implied by CD) Confirms the Back-to-Back mounting. The bearings are matched and preloaded to function as a single, highly rigid unit. |
| A | Denotes the Extra Light preload applied to the matched set. This preload eliminates internal clearance, enhancing rigidity and positioning accuracy without generating excessive heat. |
71913 CD/P4ADBA Bearing Structural Features & Performance Benefits
- Superior Rigidity and Running Accuracy: The duplex back-to-back (DB) arrangement creates a wide, stable support system that significantly increases resistance to moment loads and shaft deflection. Combined with the P4A precision class, this ensures exceptional rotational accuracy and minimal runout.
- Optimized for High-Speed Operation: The phenolic resin cage is lightweight and possesses excellent sliding properties, contributing to lower friction, reduced heat generation, and stable operation at the high limiting speed of 31,000 rpm.
- High Load Capacity: With a 15° contact angle and a dynamic load rating of 7470 lbf, this bearing set is capable of supporting significant combined radial and axial loads.
- Pre-Lubricated for Immediate Service: The bearings are factory-lubricated, ensuring optimal performance from initial startup and simplifying installation.
71913 CD/P4ADBA Bearing Typical Application Areas
This high-precision duplex bearing set is specifically designed for demanding applications where maximum rigidity and speed are critical. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: For PCB drilling, engraving, and other high-accuracy machining.
- High-Frequency Motors: Spindles for routers and other high-RPM electric motors.
- Medical Equipment: High-speed centrifuges and dental handpieces.
