71815 ACD/P4QBCB
71800 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71815 ACD/P4QBCB
Basic Information
System of measurement
Metric
Weight
0.57 kg
Tolerance class
P4
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
75 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
95 mm
Outside diameter tolerance
-0.004mm to 0
Width
40 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
5.556 mm
Ball quantity
33
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
7898 lbf
Radial static load rating
14400 lbf
Limiting speed
28 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Quadruplex Back-to-Back (QBC)
Number of bearings in matched set
4
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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71815 ACD/P4QBCB Bearing Product Overview & Core Advantages
The 71815 ACD/P4QBCB is a precision quadruplex angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. This P4 tolerance class bearing features a back-to-back (QBC) matched arrangement of four bearings, enabling it to withstand combined radial and axial loads from multiple directions simultaneously. Its light preload (Class B) ensures minimal deflection under operational stresses, making it ideal for high-precision, high-rigidity systems where positional accuracy is critical.
71815 ACD/P4QBCB Bearing Model Code Explained, Specifications & Naming Convention
The model number 71815 ACD/P4QBCB is decoded as follows:
- 71815: Basic bearing series, denoting a 75mm bore, 95mm OD, and 40mm width.
- ACD: Angular Contact design with a 25° contact angle.
- P4: Indicates high precision tolerance class, superior to standard ABEC-7.
- QBCB: Denotes a Quadruplex Back-to-Back matched set of four bearings.
71815 ACD/P4QBCB Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The quadruplex back-to-back arrangement provides exceptional system stiffness, effectively resisting moment loads and supporting heavy combined loads. The 25° contact angle optimizes axial load carrying capability.
- Precision Performance: Manufactured to P4 tolerance class with a phenolic cage, this bearing ensures smooth operation, reduced vibration, and precise rotational accuracy essential for high-speed spindles.
- Optimized for High-Speed Operation: The lightweight phenolic cage and chrome steel construction contribute to a high limiting speed of 28,000 rpm, suitable for rapid acceleration and deceleration cycles.
- Pre-lubricated & Ready-to-Install: Comes pre-lubricated for immediate use, simplifying installation and ensuring optimal performance from startup within its specified temperature range of -30°C to 110°C.
71815 ACD/P4QBCB Bearing Typical Application Areas
This bearing is specifically engineered for high-precision machinery and systems, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers requiring extreme accuracy and rigidity.
- Precision Gearboxes: Applications demanding minimal backlash and high torque capacity.
- Industrial Robotics: Critical joints and actuators where precision positioning and repeatability are paramount.
- Aerospace Actuation Systems: Flight control surfaces and other mechanisms requiring reliable performance under combined loads.
