71813 CD/P4DBA
71800 Series Super Precision Angular Contact Ball Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
71813 CD/P4DBA
Basic Information
System of measurement
Metric
Weight
0.25 kg
Tolerance class
P4
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
65 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
85 mm
Outside diameter tolerance
-0.004mm to 0
Width
20 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
5.556 mm
Ball quantity
29
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
4972 lbf
Radial static load rating
6750 lbf
Limiting speed
36 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
No drawings available at the moment, will be launched soon
Price:
$ 204.57
/ each
In Stock
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71813 CD/P4DBA Bearing Product Overview & Core Advantages
The 71813 CD/P4DBA is a precision duplex angular contact ball bearing designed for applications requiring exceptional rotational accuracy and rigidity. This matched back-to-back arrangement (DB) provides superior stiffness and can accommodate combined loads (radial and axial loads acting simultaneously). Manufactured to P4 tolerance class, it ensures minimal runout and vibration, making it ideal for high-precision, high-reliability machinery. The pre-lubricated design and phenolic cage contribute to its ready-to-install convenience and stable performance.
71813 CD/P4DBA Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| CD | Indicates a duplex bearing in a Back-to-Back (DB) arrangement. This configuration provides high moment rigidity and excellent stability under complex loads. |
| P4 | Denotes the tolerance class, signifying high precision with extremely tight dimensional and running accuracy tolerances. |
| DBA | Specifies the preload level as Extra Light (Class A). This light preload minimizes friction and heat generation, making it suitable for high-speed applications. |
71813 CD/P4DBA Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The duplex back-to-back (DB) design creates a wide effective spread between load centers, significantly increasing the bearing's moment stiffness and operational stability under heavy or fluctuating loads.
- Superior Load Capacity: With a 15° contact angle, this bearing is optimized to handle significant combined radial and axial loads simultaneously, a common requirement in precision spindles.
- High-Speed Capability: The lightweight phenolic resin cage ensures low centrifugal forces and excellent guidance, while the extra light preload (A) reduces friction, collectively enabling a high limiting speed of 36,000 rpm.
- Precision Performance: Manufactured to ABEC 7 / P4 tolerance class, this bearing guarantees minimal runout and vibration, which is critical for achieving superior surface finishes and machining accuracy.
- Optimized Material: Components made from chrome steel provide high hardness, wear resistance, and long service life under demanding conditions.
71813 CD/P4DBA Bearing Typical Application Areas
This bearing is engineered for high-performance applications where precision, speed, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Drilling Spindles
- High-Frequency Motors
- Robotic Arm Joints and Precision Gearboxes
- Medical and Dental Equipment Spindles
- Aerospace Actuation Systems
