71814 ACD/P4DBB
71800 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71814 ACD/P4DBB
Basic Information
System of measurement
Metric
Weight
0.27 kg
Tolerance class
P4
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
70 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
90 mm
Outside diameter tolerance
-0.004mm to 0
Width
20 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
5.556 mm
Ball quantity
31
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
4770 lbf
Radial static load rating
6750 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
Light / Class B
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
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In Stock
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71814 ACD/P4DBB Bearing Product Overview & Core Advantages
The 71814 ACD/P4DBB is a precision duplex angular contact ball bearing designed for applications demanding exceptional rigidity and running accuracy. This P4 tolerance class bearing is supplied as a matched set in a back-to-back (DB) arrangement with a light preload (Class B). This configuration enables it to withstand combined loads (significant radial and axial loads in both directions) simultaneously, making it ideal for high-precision, high-rigidity systems. Its compact cross-section and superior material selection ensure reliable performance in demanding operational conditions.
71814 ACD/P4DBB Bearing Model Code Explained, Specifications & Naming Convention
The model number 71814 ACD/P4DBB provides detailed technical specifications:
- 71814: Basic bearing series, indicating a metric, extra-light series angular contact ball bearing with a 70mm bore.
- A: Denotes a 25° contact angle, optimized for carrying higher axial loads.
- C: Indicates the bearing is manufactured with enhanced dimensional and running accuracy.
- D: Specifies a duplex pair of bearings.
- P4: The tolerance class, equivalent to ISO Class 4, indicating very high precision for dimensions and running accuracy.
- DBB: Stands for Duplex Back-to-Back arrangement. This configuration provides high moment rigidity and excellent stability.
71814 ACD/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 moment loads and shaft deflection, ensuring precise rotational alignment.
- Superior Load Capacity: The 25° contact angle and duplex design provide excellent capability for handling combined radial and bidirectional axial loads.
- High-Speed Capability: The lightweight and robust phenolic resin cage ensures stable operation and reduced centrifugal forces, contributing to the high limiting speed of 28,000 rpm.
- Precision Performance: Manufactured to P4 tolerance class with tight dimensional tolerances on bore, outside diameter, and width, guaranteeing minimal runout and superior rotational accuracy.
- Durable Construction: Components made from chrome steel offer high fatigue life and wear resistance, suitable for a wide temperature range from -30°C to 110°C.
71814 ACD/P4DBB Bearing Typical Application Areas
This high-precision duplex bearing is ideally suited for applications requiring maximum rigidity and accuracy, such as:
- Machine Tool Spindles (High-speed milling, grinding, and turning centers)
- Precision Gearboxes
- High-Frequency Motors and Spindles
- Medical and Laboratory Equipment
- Robotic Arm Joints and Precision Drives
