71934 ACD/P4ATBTA
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71934 ACD/P4ATBTA
Basic Information
System of measurement
Metric
Weight
8.55 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
170 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
230 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
29
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
59625 lbf
Radial static load rating
108000 lbf
Limiting speed
16.25 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
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In Stock
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71934 ACD/P4ATBTA Bearing Product Overview & Core Advantages
The 71934 ACD/P4ATBTA is a precision angular contact ball bearing designed for high-performance applications requiring exceptional rigidity and accuracy. This triplex back-to-back (TBT) matched set provides superior stability and load-carrying capacity. Engineered to P4A tolerance class with an extra light preload (Class A), it delivers outstanding running accuracy and is optimized for high-speed operation. Its primary advantage lies in its ability to handle significant combined loads (radial and axial) simultaneously, making it ideal for demanding, high-precision machinery.
71934 ACD/P4ATBTA Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| ACD | 25° contact angle design, optimized for high axial load capacity. |
| P4A | High precision tolerance class, exceeding ABEC 7 standards for superior running accuracy. |
| TB | Back-to-Back arrangement of bearings in the set. |
| T | Triplex (set of three bearings). |
| A | Specifies extra light preload for minimal friction and optimal high-speed performance. |
71934 ACD/P4ATBTA Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The triplex back-to-back (TBT) matched set configuration creates a highly rigid bearing system that effectively resists moment loads and maintains shaft positioning under heavy combined loads.
- Superior Load Capacity: With a 25° contact angle and three bearings working in unison, this set offers a high radial dynamic load rating of 59,625 lbf and a radial static load rating of 108,000 lbf.
- Optimized High-Speed Performance: The combination of a lightweight phenolic cage, extra light preload, and precision grinding allows for a high limiting speed of 16,250 rpm.
- Precision Engineering: Manufactured to P4A tolerance class with tight bore, outside diameter, and width tolerances, ensuring smooth, quiet, and vibration-free operation.
- Durable Construction: Made from chrome steel for both rings and balls, providing excellent wear resistance and long service life.
71934 ACD/P4ATBTA Bearing Typical Application Areas
This bearing is specifically designed for high-precision, high-speed machinery where maximum rigidity and accuracy are paramount. Key applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Gearboxes: Especially in industrial robotics and aerospace drive systems.
- High-Frequency Motors and Spindles: Applications requiring minimal runout and high rotational accuracy.
- Medical Equipment: High-speed centrifuges and advanced imaging systems.
- Test and Measurement Equipment: Where precise rotational movement is critical.
