71921 ACDGA/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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71921 ACDGA/P4A Bearing Product Overview & Core Advantages
The 71921 ACDGA/P4A is a high-precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. Manufactured to P4A tolerance class, this bearing delivers superior running accuracy and dimensional stability. Its 25° contact angle and phenolic cage are optimized for high-speed operation, making it ideal for machine tool spindles and other precision equipment. The bearing is supplied pre-lubricated and is universally matchable, allowing for flexible mounting configurations in complex arrangements.
71921 ACDGA/P4A Bearing Model Code Explained, Specifications & Naming Convention
- 71921: Basic bearing designation indicating size series and bore diameter
- AC: Angular Contact design with a 25° contact angle
- D: High rigidity design with optimized internal geometry
- GA: Universal matching bearing that can be mounted in any combination
- P4A: Extra high precision tolerance class exceeding ABEC 7 standards
71921 ACDGA/P4A Bearing Structural Features & Performance Benefits
The 71921 ACDGA/P4A incorporates several advanced design features that deliver superior performance:
- High Rigidity & Precision: Manufactured to P4A tolerance standards with bore and outside diameter tolerances of -0.004mm to 0, ensuring exceptional dimensional stability and running accuracy under demanding conditions.
- Optimized High-Speed Performance: The phenolic resin cage and 25° contact angle enable stable operation at limiting speeds up to 16,000 rpm, while the precision-ground chrome steel balls minimize vibration and heat generation.
- Superior Load Capacity: With a dynamic load rating of 12,870 lbf and static load rating of 14,738 lbf, this bearing reliably handles combined radial and axial loads in high-precision applications.
- Universal Matching Capability: Designed as a universally matchable bearing, multiple units can be arranged in sets of three to create preloaded configurations without selective matching, simplifying installation and maintenance.
71921 ACDGA/P4A Bearing Typical Application Areas
The 71921 ACDGA/P4A finds extensive use in precision applications requiring high rotational accuracy and speed capabilities:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers
- Precision Instrumentation: Measuring equipment and optical devices
- High-Speed Motors: Spindle motors and servo drives
- Aerospace Components: Gyroscopes and navigation systems
- Medical Equipment: Dental handpieces and surgical tools
