71907 ACDGA/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71907 ACDGA/P4A
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
5.556 mm
Ball quantity
21
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
2077 lbf
Radial static load rating
1395 lbf
Limiting speed
56 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Number of bearings in matched set
3
Universal matching bearing
Universal Matchable (SU)
Preload
Extra light / Class A
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
Price:
$ 85.93
/ each
In Stock
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71907 ACDGA/P4A Bearing Product Overview & Core Advantages
The 71907 ACDGA/P4A is a high-precision angular contact ball bearing designed for applications demanding exceptional accuracy and rigidity. Engineered to a P4A tolerance class, it offers superior dimensional stability and running accuracy. Its 25° contact angle is optimized to support significant combined loads, handling both radial and axial forces efficiently. The phenolic cage and universal matching designation (Universal Matchable (SU)) make it ideal for high-speed spindle arrangements and other precision machinery where high rigidity and minimal thermal expansion are critical.
71907 ACDGA/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Suffix | Technical Meaning |
|---|---|
| AC | Angular Contact design with a 25° contact angle. |
| D | High Ball Diameter and quantity for increased load capacity. |
| GA | Matched set with specific axial clearance (preload). "A" denotes Extra Light Preload. |
| P4A | Super Precision tolerance class, exceeding ABEC 7 standards, for exceptional running accuracy. |
71907 ACDGA/P4A Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The optimized internal geometry, including a large ball diameter and 21-ball complement, provides high resistance to deformation under combined radial and axial loads.
- High-Speed Performance: The lightweight, durable phenolic resin cage ensures stable operation and reduced centrifugal forces, enabling a high limiting speed of 56,000 rpm.
- Precision & Thermal Stability: Manufactured to P4A tolerances with extremely tight dimensional control on the bore diameter, outside diameter, and width. The phenolic cage also offers excellent dimensional stability across the operating temperature range.
- Universal Matching: As a Universal Matchable (SU) bearing, it can be universally paired with other bearings from the same lot to form precisely preloaded sets (in this case, sets of 3), simplifying installation and ensuring optimal system stiffness.
71907 ACDGA/P4A Bearing Typical Application Areas
This bearing is specified for high-performance applications where precision and speed are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and high-accuracy rotary axes.
- Medical Equipment: Dental handpieces and imaging scanner rotors.
- Aerospace & Defense: Gyroscopes, radar systems, and navigation instruments.
