S71908 ACB/P4ADBB
Sealed Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
S71908 ACB/P4ADBB
Basic Information
System of measurement
Metric
Weight
0.25 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
24 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
3.969 mm
Ball quantity
28
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
1843 lbf
Radial static load rating
1755 lbf
Limiting speed
41 X 1000 rpm
Lubrication
Grease
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
No drawings available at the moment, will be launched soon
In Stock
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S71908 ACB/P4ADBB Bearing Product Overview & Core Advantages
The S71908 ACB/P4ADBB is a precision duplex angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. This metric system bearing features a back-to-back (DB) matched arrangement and a light preload (Class B), enabling it to withstand combined radial and axial loads from both directions simultaneously. Manufactured to P4A super-precision tolerance standards with a 25° contact angle, it delivers high running accuracy, excellent stability, and is ideally suited for high-speed, high-rigidity spindles and precision machinery where uncompromising performance is critical.
S71908 ACB/P4ADBB Bearing Model Code Explained, Specifications & Naming Convention
The model number S71908 ACB/P4ADBB provides detailed technical specifications:
- S7: Indicates a series of high-precision angular contact ball bearings.
- 1908: Denotes the size series, with a 40mm bore, 62mm OD, and 24mm width.
- ACB: Signifies the bearing's configuration. A represents a 25° contact angle. C indicates the cage material is phenolic resin. B designates the light preload class.
- P4A: Defines the tolerance class, specifying extremely tight dimensional and running accuracy standards superior to ABEC 7.
- DBB: Confirms the duplex back-to-back (DB) arrangement of the two matched bearings in the set.
S71908 ACB/P4ADBB Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The duplex back-to-back (DB) arrangement creates a rigid bearing system that effectively resists moment loads and supports significant combined radial and axial loads from both directions.
- Super-Precision Performance: Manufactured to P4A tolerance class with a 25° contact angle, this bearing ensures minimal runout, high positional accuracy, and smooth, quiet operation essential for precision applications.
- Optimized High-Speed Operation: The lightweight and robust phenolic resin cage maintains stability and guides the balls efficiently at high rotational speeds, contributing to the bearing's high limiting speed of 41,000 rpm.
- Sealed & Pre-Lubricated: As a sealed bearing pre-lubricated with grease, it is protected from contamination and is ready for immediate use, offering long-term, maintenance-free operation within its specified temperature range.
- Superior Material: Components made from chrome steel provide high hardness, wear resistance, and a long operational lifespan under demanding conditions.
S71908 ACB/P4ADBB Bearing Typical Application Areas
This high-precision duplex bearing is engineered for advanced machinery requiring ultimate accuracy and speed:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling and routing spindles.
- High-Frequency Motors: Spindles for high-RPM electric motors.
- Medical Equipment: Dental handpieces and precision surgical tools.
- Robotics: High-accuracy joints and rotary actuators.
