71809 ACD/P4DBC
71800 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71809 ACD/P4DBC
Basic Information
System of measurement
Metric
Weight
0.078 kg
Tolerance class
P4
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
45 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
58 mm
Outside diameter tolerance
-0.004mm to 0
Width
14 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
3.175 mm
Ball quantity
31
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
1667 lbf
Radial static load rating
2250 lbf
Limiting speed
46 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
Moderate / Class C
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
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In Stock
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71809 ACD/P4DBC Bearing Product Overview & Core Advantages
The 71809 ACD/P4DBC is a precision angular contact ball bearing designed for demanding applications requiring high rigidity and exceptional running accuracy. This duplex back-to-back (DB) arrangement provides superior stability and can accommodate combined loads (radial and axial loads simultaneously). Manufactured to P4 tolerance class, it ensures minimal runout and vibration, making it ideal for high-speed, high-precision machinery. Its moderate preload (Class C) enhances system stiffness right from installation, reducing deflection under operational stresses.
71809 ACD/P4DBC Bearing Model Code Explained, Specifications & Naming Convention
The model number 71809 ACD/P4DBC provides detailed technical specifications:
- 71809: Basic bearing series, indicating a 45 mm bore, 58 mm OD, and 14 mm width.
- A: Denotes a 25° contact angle, optimized for carrying higher axial loads.
- C: Indicates a Moderate Preload (Class C) for increased rigidity.
- D: Specifies the bearing is supplied as a Duplex (matched pair) set.
- P4: The tolerance class, signifying very high precision with tight dimensional and running accuracy limits.
- DB: The Duplex Back-to-Back mounting arrangement, which provides high moment rigidity.
- C: The cage material is Phenolic, offering high strength and suitability for high-speed operation.
71809 ACD/P4DBC 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, crucial for maintaining precision under heavy combined loads.
- Superior Load Capacity: With a 25° contact angle and a dynamic load rating of 1667 lbf, this bearing is engineered to handle significant radial and bidirectional axial loads efficiently.
- High-Speed Performance: The lightweight and robust phenolic cage minimizes centrifugal forces, reduces friction, and allows for a high limiting speed of 46,000 rpm. The open design facilitates efficient lubrication and cooling.
- Precision Engineering: Conforming to P4 tolerance class, the bearing ensures exceptional dimensional accuracy and rotational precision, leading to smooth operation, reduced noise, and extended service life in precision spindles and machinery.
- Material Quality: Constructed from chrome steel for both rings and balls, the bearing offers high hardness, wear resistance, and durability under demanding operating conditions.
71809 ACD/P4DBC Bearing Typical Application Areas
This high-precision, high-speed bearing is ideally suited for applications where rigidity and accuracy are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Drives: Servo motors, high-frequency spindles, and robotics.
- Aerospace & Defense: Gyroscopes, radar systems, and navigation equipment.
- Medical Equipment: High-speed dental handpieces and surgical drill spindles.
- Test & Measurement Equipment: Coordinate measuring machines (CMM) and precision rotary tables.
