71930 ACD/P4ATBTA
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71930 ACD/P4ATBTA
Basic Information
System of measurement
Metric
Weight
7.5 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
150 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
210 mm
Outside diameter tolerance
-0.004mm to 0
Width
84 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
19.05 mm
Ball quantity
23
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
52650 lbf
Radial static load rating
84375 lbf
Limiting speed
11 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Triplex Back-to-Back (TBT)
Number of bearings in matched set
3
Universal matching bearing
No (Standard)
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:
$ 1828.56
/ each
In Stock
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71930 ACD/P4ATBTA Bearing Product Overview & Core Advantages
The 71930 ACD/P4ATBTA is a metric system, ultra-precision angular contact ball bearing designed for the most demanding applications. This bearing is supplied as a triplex back-to-back (TBT) matched set with an extra light preload (Class A), delivering exceptional rotational accuracy and system rigidity. Its primary advantage lies in its ability to handle combined loads—significant radial loads and thrust loads in both directions—simultaneously, making it ideal for high-speed spindles requiring maximum stability and minimal runout.
71930 ACD/P4ATBTA Bearing Model Code Explained, Specifications & Naming Convention
The model number 71930 ACD/P4ATBTA is decoded as follows:
- 71930: Basic bearing series, indicating a high-precision, light-weight angular contact design with a 150mm bore.
- ACD: Angular Contact design with a 25° contact angle, optimized for high thrust capacity.
- P4A: Denotes an ultra-precision tolerance class superior to ABEC 7 (P4), with specific focus on running accuracy.
- TB: Indicates a Triplex Back-to-Back matched arrangement of three bearings.
- T: Specifies the cage material as Phenolic (fiberglass reinforced), which is lightweight and suitable for high-speed operation.
- A: Signifies the Extra Light Preload (Class A) applied to the matched set, reducing deflection and heat generation at high speeds.
71930 ACD/P4ATBTA Bearing Structural Features & Performance Benefits
- Exceptional Rigidity and Stability: The triplex back-to-back (TBT) arrangement creates a highly rigid bearing system that effectively resists moment loads, ensuring precise shaft positioning and minimal deflection under heavy combined loads.
- High-Speed Capability: The lightweight phenolic cage and optimized internal geometry, combined with the extra light preload, enable very high limiting speeds (up to 11,000 rpm), making it suitable for demanding spindle applications.
- Superior Precision: Manufactured to P4A tolerance class, this bearing guarantees extremely tight dimensional and running accuracy for applications requiring the highest levels of performance and repeatability.
- High Load Capacity: With a dynamic load rating of 52,650 lbf and a static load rating of 84,375 lbf, it is engineered to withstand significant operational stresses over a long service life.
- Optimized for Pre-lubrication: The bearing is supplied lubricated and features an open seal type, allowing for optimal integration into centralized lubrication systems commonly found in machine tool spindles.
71930 ACD/P4ATBTA Bearing Typical Application Areas
The 71930 ACD/P4ATBTA is engineered for high-performance machinery where precision, speed, and rigidity are paramount. Key applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: For PCB drilling, semiconductor manufacturing, and other high-accuracy machining processes.
- High-Frequency Motors and High-Speed Drives.
- Industrial Pumps and Compressors operating at high rotational speeds.
