71944 ACDGB/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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Product Overview and Core Advantages
The 71944 ACDGB/P4A is a single row angular contact ball bearing designed for high-precision applications requiring exceptional rotational accuracy and rigidity. Engineered to a P4A tolerance class, this bearing is optimized to accommodate primarily axial loads in one direction, combined with moderate radial loads. Its 25° contact angle and Universal Matchable (SU) designation make it ideal for preloaded arrangements in machine tool spindles and other high-speed machinery, delivering reliable performance and long service life.
71944 ACDGB/P4A Bearing Model Code Explained, Specifications & Naming Convention
- 71944: Basic bearing series, indicating a light series, single row angular contact design with a 220mm bore.
- AC: Angular Contact design.
- D: High contact angle (25°).
- GB: Light preload (Class B).
- P4A: High-precision tolerance class, exceeding ABEC 7 standards, with enhanced running accuracy specifications.
Structural Features and Performance Benefits
High Precision and Rigidity: Manufactured to P4A tolerances, this bearing ensures minimal runout and vibration, which is critical for applications like machine tool spindles. The phenolic cage provides excellent dimensional stability and reduced friction at high speeds, contributing to a limiting speed of 11,000 rpm.
Optimized Load Capacity: The 25° contact angle is engineered for superior axial load carrying capacity while also supporting significant radial loads (dynamic: 46,800 lbf, static: 64,125 lbf).
Universal Matching: Designated as Universal Matchable (SU), these bearings can be universally paired in any combination to form preloaded sets (typically in sets of 2 or 3), simplifying inventory and assembly for duplex arrangements.
Premium Materials: Constructed from chrome steel for both rings and balls, ensuring high durability and resistance to wear under demanding operating conditions.
71944 ACDGB/P4A Bearing Typical Application Areas
This high-precision angular contact bearing is ideally suited for:
- Machine Tool Spindles (milling, grinding, and turning centers)
- High-Speed Machining Centers
- Precision Gearboxes
- Industrial Pumps and Compressors
- Robotic Arm Joints and Rotary Tables
