71824 CD/P4DBB
71800 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71824 CD/P4DBB
Basic Information
System of measurement
Metric
Weight
1.1 kg
Tolerance class
P4
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
120 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
150 mm
Outside diameter tolerance
-0.004mm to 0
Width
32 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
8.731 mm
Ball quantity
35
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
12150 lbf
Radial static load rating
20250 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
Light / Class B
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
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71824 CD/P4DBB Bearing Product Overview & Core Advantages
The 71824 CD/P4DBB is a precision angular contact ball bearing configured as a duplex back-to-back (DB) matched set. Engineered to the exacting P4 tolerance class, it delivers exceptional rotational accuracy and dimensional stability. This bearing is preloaded (Light / Class B) to eliminate internal clearance, resulting in superior system rigidity and precise shaft positioning. Its primary advantage lies in its optimized design for handling combined loads, particularly complex loads involving significant radial and axial components, making it an ideal choice for high-precision, high-speed applications demanding maximum stiffness and minimal runout.
71824 CD/P4DBB Bearing Model Code Explained, Specifications & Naming Convention
| Model Segment | Technical Meaning |
|---|---|
| 71824 | Basic bearing designation, indicating a metric, angular contact bearing with a 120 mm bore, 150 mm OD, and 32 mm width. |
| C | Designates a 15° contact angle, optimized for high-speed performance and moderate axial load capacity. |
| D | Indicates the bearing is part of a duplex (matched) pair. |
| P4 | Specifies the tolerance class, denoting very high precision with tight dimensional and running accuracy tolerances. |
| DB | Defines the matched arrangement as Back-to-Back (DB). This configuration provides high moment rigidity and excellent stability under complex loads. |
71824 CD/P4DBB Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The duplex back-to-back (DB) arrangement creates a wide, rigid support system that effectively resists overturning moments and ensures exceptional shaft stability under heavy combined loads.
- Precision Performance: Manufactured to P4 tolerance class with a light preload, this bearing set minimizes axial and radial runout, enabling smooth, precise rotation essential for high-accuracy machinery.
- Optimized High-Speed Capability: The 15° contact angle and lightweight phenolic cage reduce centrifugal forces and friction, allowing for a high limiting speed of 16,250 rpm.
- Superior Load Capacity: Constructed from high-grade chrome steel for both rings and balls, the bearing is rated for a dynamic load of 12,150 lbf and a static load of 20,250 lbf, ensuring long-term reliability.
- Open Design with Lubrication: The open seal type allows for optimal lubrication flow and heat dissipation, which is critical for maintaining performance at high speeds.
71824 CD/P4DBB Bearing Typical Application Areas
This precision bearing set is specifically designed for demanding applications where high rigidity, accuracy, and speed are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Gearboxes: Industrial drives and transmissions requiring minimal deflection.
- High-Frequency Spindles: PCB drilling and routing machines.
- Robotic Arms & Actuators: Joints and rotary units needing high moment stiffness.
- Medical Equipment: High-speed centrifuges and imaging device rotors.
