71807 ACD/P4DBB
71800 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71807 ACD/P4DBB
Basic Information
System of measurement
Metric
Weight
0.056 kg
Tolerance class
P4
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
35 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
47 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
26
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
1580 lbf
Radial static load rating
1834 lbf
Limiting speed
56 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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71807 ACD/P4DBB Bearing Product Overview & Core Advantages
The 71807 ACD/P4DBB is a precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. This duplex back-to-back (DB) matched pair configuration is preloaded to Light / Class B specifications, delivering superior system stiffness and precise shaft positioning. Its primary advantage lies in its ability to handle combined loads—significant radial and axial loads in both directions—simultaneously, making it ideal for high-precision, high-rigidity systems where minimal deflection is critical.
71807 ACD/P4DBB Bearing Model Code Explained, Specifications & Naming Convention
The model number 71807 ACD/P4DBB is decoded as follows:
- 71807: Basic bearing series, indicating a metric, angular contact design with a 35mm bore.
- A: Denotes a 25° contact angle, optimized for carrying higher axial loads.
- C: Indicates the bearing is manufactured with a Phenolic (polyamide) cage.
- D: Specifies a Duplex (two-bearing) configuration.
- P4: Identifies the tolerance class, corresponding to high precision with very tight dimensional and running accuracy.
- DBB: Defines the matched arrangement as Back-to-Back (DB), which provides high moment rigidity.
71807 ACD/P4DBB Bearing Structural Features & Performance Benefits
- High Rigidity & System Stability: The duplex back-to-back arrangement creates a wide, rigid support system that effectively resists moment loads and shaft deflection, ensuring exceptional operational stability.
- Superior Load Capacity: With a 25° contact angle and a dynamic load rating of 1580 lbf, this bearing is engineered to handle significant combined radial and axial loads from both directions.
- High-Speed Capability: The lightweight phenolic cage reduces centrifugal forces, allows for efficient lubrication, and contributes to a high limiting speed of 56,000 rpm.
- Precision Performance: Manufactured to P4 tolerance class, this bearing guarantees minimal runout and vibration, which is essential for applications requiring high rotational accuracy.
- Optimized Material: Components made from Chrome Steel provide excellent durability and fatigue resistance, ensuring a long service life under demanding conditions.
71807 ACD/P4DBB Bearing Typical Application Areas
This high-precision duplex bearing is ideally suited for:
- Machine Tool Spindles
- High-Frequency Machining Centers
- Precision Grinding Spindles
- High-Speed Pumps and Compressors
- Robotic Arm Joints and Precision Gearboxes
