S71908 CDGB/P4A
Sealed Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
S71908 CDGB/P4A
Basic Information
System of measurement
Metric
Weight
0.11 kg
Tolerance class
P4A
Seal type
Sealed
For load direction
Angular Contact
Main Dimensions
Bore diameter
40 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
62 mm
Outside diameter tolerance
-0.004mm to 0
Width
12 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
6.35 mm
Ball quantity
21
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
2790 lbf
Radial static load rating
1912 lbf
Limiting speed
41 X 1000 rpm
Lubrication
Grease
Matched arrangement
Single
Number of bearings in matched set
2
Universal matching bearing
Universal Matchable (SU)
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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S71908 CDGB/P4A Bearing Product Overview & Core Advantages
The S71908 CDGB/P4A is a super-precision angular contact ball bearing designed for applications demanding exceptional accuracy and high-speed performance. As a single bearing from a universally matchable (SU) set, it excels in handling combined radial and axial loads simultaneously. Its P4A tolerance class ensures ultra-precise running accuracy, while the phenolic cage and grease lubrication contribute to its high limiting speed of 41,000 rpm. This bearing is engineered for high rigidity and reliable operation in demanding precision machinery.
S71908 CDGB/P4A Bearing Model Code Explained, Specifications & Naming Convention
The model number S71908 CDGB/P4A is decoded as follows:
- S7: Indicates a series of high-precision, super-precision bearings.
- 1908: Denotes the size series; 19 for the series and 08 for a 40 mm bore diameter.
- C: Signifies a 15° contact angle, optimized for high-speed applications.
- D: Represents a light preload (Class B), which enhances system rigidity and minimizes runout.
- G: Indicates the bearing is filled with a grease lubricant.
- B: Specifies a phenolic resin cage, which is lightweight and suitable for high speeds.
- /P4A: Denotes an ultra-high precision tolerance class exceeding ABEC 7, ensuring minimal dimensional and running inaccuracies.
S71908 CDGB/P4A Bearing Structural Features & Performance Benefits
The S71908 CDGB/P4A derives its superior performance from its specific construction:
- High Rigidity and Precision: The light preload (Class B) eliminates internal clearance, providing high system stiffness and precise rotational accuracy, which is critical for machine tool spindles.
- Optimized Load Capacity: The 15° contact angle is ideal for supporting significant combined loads, offering a robust dynamic load rating of 2790 lbf.
- Superior High-Speed Performance: The lightweight phenolic cage reduces centrifugal forces, and the optimized grease lubrication allows for a very high limiting speed, making it an excellent high-speed bearing.
- Sealed and Pre-Lubricated: As a sealed bearing with factory-applied grease, it is protected from contamination and is ready for immediate use, offering long-term, maintenance-free operation within its specified temperature range.
S71908 CDGB/P4A Bearing Typical Application Areas
This precision bearing is ideally suited for high-performance applications, including:
- Machine Tool Spindles
- High-Frequency Motors
- Precision Grinding Spindles
- Industrial Pumps and Compressors
- Aerospace Control Systems
- Medical and Dental Equipment
