71907 ACBGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71907 ACBGA/HCP4A
Basic Information
System of measurement
Metric
Weight
0.074 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
35 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
55 mm
Outside diameter tolerance
-0.004mm to 0
Width
10 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
3.969 mm
Ball quantity
25
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
1098 lbf
Radial static load rating
776 lbf
Limiting speed
56 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Number of bearings in matched set
2
Universal matching bearing
Universal Matchable (SU)
Preload
Extra light / Class A
Materials
Ring material
Chrome Steel
Ball material
Ceramic
Cage material
Phenolic
Technical Drawings
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In Stock
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71907 ACBGA/HCP4A Bearing Product Overview & Core Advantages
The 71907 ACBGA/HCP4A is a high-precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. This single bearing features a 25° contact angle and is manufactured to P4A tolerance class, ensuring superior running accuracy. Its core advantages include the ability to accommodate combined radial and axial loads, high-speed capability facilitated by a phenolic cage and ceramic balls, and universal matchability (SU), allowing for precise preload control when mounted in pairs. This makes it an ideal solution for high-reliability, high-performance machinery.
71907 ACBGA/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71907 AC | Angular Contact bearing series with a 25° contact angle. |
| B | 40° contact angle designation. |
| GA | Indicates a universally matchable (SU) bearing, supplied with specific internal clearance for pairing to achieve a defined preload. |
| HC | Refers to the hybrid ceramic construction, featuring ceramic balls and a steel ring. |
| P4A | Denotes a high-precision tolerance class with tighter dimensional and running accuracy specifications than ABEC 7. |
71907 ACBGA/HCP4A Bearing Structural Features & Performance Benefits
- High Rigidity and Load Capacity: The angular contact design and robust construction enable the bearing to support significant combined loads (radial and axial). The ceramic balls provide higher stiffness and reduce deformation under load.
- Superior High-Speed Performance: The combination of a lightweight phenolic resin cage and low-density ceramic balls reduces centrifugal forces, enabling a high limiting speed of 56,000 rpm. This design minimizes friction and heat generation.
- Extended Service Life and Reliability: Hybrid ceramic construction offers excellent wear resistance and is less susceptible to lubrication failure. The bearing is pre-lubricated for immediate operation and performs reliably within a temperature range of -30°C to 110°C.
- Precision Engineering: Manufactured to P4A tolerance class with tight bore, outside diameter, and width tolerances, this bearing ensures minimal runout and vibration, which is critical for precision applications.
71907 ACBGA/HCP4A Bearing Typical Application Areas
This high-precision angular contact ball bearing is ideally suited for demanding applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Instrumentation: Measuring devices, optical scanners, and coordinate measuring machines (CMM).
- High-Frequency Motors and Spindles: PCB drilling spindles and dental handpieces.
- Aerospace and Defense Systems: Gyroscopes, navigation systems, and auxiliary power units (APUs).
