S71905 ACDGA/P4A
Sealed Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
S71905 ACDGA/P4A
Basic Information
System of measurement
Metric
Weight
0.043 kg
Tolerance class
P4A
Seal type
Sealed
For load direction
Angular Contact
Main Dimensions
Bore diameter
25 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
42 mm
Outside diameter tolerance
-0.004mm to 0
Width
9 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
4.762 mm
Ball quantity
18
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
1433 lbf
Radial static load rating
855 lbf
Limiting speed
83 X 1000 rpm
Lubrication
Grease
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
In Stock
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S71905 ACDGA/P4A Bearing Product Overview & Core Advantages
The S71905 ACDGA/P4A is a super-precision angular contact ball bearing designed for applications demanding the highest levels of accuracy and performance. As a single bearing with a 25° contact angle and Extra Light (A) preload, it is engineered to provide exceptional running accuracy and high rigidity. Its compact design, featuring a 9 mm width, makes it ideal for high-speed spindles and other precision machinery where space is constrained and reliability is paramount. This bearing is capable of supporting combined loads (radial and axial) simultaneously.
S71905 ACDGA/P4A Bearing Model Code Explained, Specifications & Naming Convention
The model number S71905 ACDGA/P4A provides detailed technical specifications through its suffixes:
- S7: Indicates a series of high-precision bearings.
- 1905: Denotes the bearing size series (19) and bore diameter (05 = 25 mm).
- AC: Angular Contact design.
- D: Signifies a phenolic resin cage.
- GA: Indicates a universally matchable bearing set with a specific preload and internal clearance.
- P4A: Specifies an extremely high tolerance class (superior to ABEC 7), ensuring minimal runout and superior dimensional stability.
S71905 ACDGA/P4A Bearing Structural Features & Performance Benefits
- High Rigidity and Running Accuracy: The 25° contact angle and Extra Light preload eliminate internal clearance, providing high system stiffness and precise rotational accuracy essential for machining and measurement applications.
- Optimized for High Speeds: The lightweight phenolic cage (D) ensures stable operation and low friction at the bearing's high limiting speed of 83,000 rpm. The grease lubrication is formulated for high-speed performance.
- Super-Precision Performance: Manufactured to a P4A tolerance class, this bearing guarantees exceptionally tight dimensional control on bore, outside diameter, and width, contributing to superior system performance.
- Universal Matching Capability (SU): As a universally matchable bearing, multiple S71905 ACDGA/P4A bearings can be mounted in any combination (back-to-back, face-to-face, or tandem) to create a matched set that meets specific application requirements for preload and rigidity.
S71905 ACDGA/P4A Bearing Typical Application Areas
This bearing is ideally suited for high-performance applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Grinding Spindles
- High-Frequency Motors
- Medical and Dental Handpieces
- Aerospace Control Systems
