71934 ACD/P4ADBD
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71934 ACD/P4ADBD
Basic Information
System of measurement
Metric
Weight
5.7 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
56 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
45675 lbf
Radial static load rating
72000 lbf
Limiting speed
16.25 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Duplex Back-to-Back (DB)
Number of bearings in matched set
2
Universal matching bearing
No (Standard)
Preload
Heavy / Class D
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
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71934 ACD/P4ADBD Bearing Product Overview & Core Advantages
The 71934 ACD/P4ADBD is a precision duplex angular contact ball bearing designed for applications requiring exceptional rigidity and accuracy. This back-to-back (DB) matched arrangement provides superior stability under combined loads, effectively handling radial forces and axial loads in both directions. Manufactured to P4A tolerance class with a heavy preload (Class D), it delivers high running accuracy and minimal deflection, making it ideal for high-precision, high-stiffness machinery. Its open design and phenolic cage contribute to its suitability for demanding operational environments.
71934 ACD/P4ADBD Bearing Model Code Explained, Specifications & Naming Convention
The model number 71934 ACD/P4ADBD breaks down as follows:
- 71934: Basic bearing series and size designation (170mm bore, 230mm OD).
- AC: Angular Contact design with a 25° contact angle.
- D: Indicates a Duplex (two bearings) configuration.
- DB: Specifies the Back-to-Back mounting arrangement.
- /P4A: Denotes a P4A tolerance class for ultra-high dimensional and running accuracy.
- DB (in suffix): Reiterates the Back-to-Back matched set.
71934 ACD/P4ADBD Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The duplex back-to-back (DB) arrangement creates a wide, rigid support system that effectively resists moment loads and shaft deflection, ensuring precise alignment under heavy operating conditions.
- Superior Load Capacity: Engineered with a 25° contact angle and high-quality chrome steel components, this bearing is rated for high radial dynamic load (45,675 lbf) and static load (72,000 lbf), making it capable of handling significant combined loads.
- Precision Performance: Manufactured to P4A tolerance class with a heavy preload, it guarantees minimal runout and exceptional rotational accuracy for critical applications.
- Optimized High-Speed Operation: The lightweight phenolic cage reduces centrifugal forces, enabling stable operation up to a limiting speed of 16,250 rpm. The open design facilitates efficient lubrication management.
- Durable Construction: Made from chrome steel for rings and balls, the bearing offers high wear resistance and long service life in rigorous industrial environments.
71934 ACD/P4ADBD Bearing Typical Application Areas
This bearing is specifically engineered for high-precision, high-stiffness applications, including:
- Machine Tool Spindles (e.g., grinding, milling, and turning centers)
- Precision Gearboxes and Industrial Pumps
- High-Speed Compressors
- Robotic Arm Joints and Rotary Tables
- Other precision machinery requiring rigid bearing support and accurate rotational guidance.
