S71904 ACDGA/P4A
Sealed Super Precision Angular Contact Ball Bearings
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S71904 ACDGA/P4A Bearing Product Overview & Core Advantages
The S71904 ACDGA/P4A is a super-precision angular contact ball bearing designed for applications demanding the highest levels of accuracy, rigidity, and speed. As a single bearing with a 25° contact angle and Extra Light (Class A) preload, it is engineered to support combined loads (radial and axial) simultaneously, providing exceptional rotational stability. Its compact cross-section, sealed design, and P4A tolerance class make it an ideal choice for high-speed spindles and other precision machinery where reliability and minimal runout are critical.
S71904 ACDGA/P4A Bearing Model Code Explained, Specifications & Naming Convention
- S7: Denotes a series of high-precision, high-speed angular contact ball bearings.
- 1904: Specifies the bearing size series (19) and bore diameter (04 x 5 = 20 mm).
- AC: Angular Contact design.
- D: Signifies a Universal Matchable (SU) bearing, allowing for precise preload setting when mounted in pairs or sets.
- GA: Indicates a specific internal clearance and preload grade (Extra Light / Class A).
- P4A: The tolerance class, specifying extremely tight dimensional and running accuracy standards superior to ABEC 7.
S71904 ACDGA/P4A Bearing Structural Features & Performance Benefits
High Rigidity and Load Capacity: The 25° contact angle and optimized internal geometry enable high resistance to deformation under combined loads, ensuring system stiffness and positioning accuracy.
Super-Precision Performance: Manufactured to a P4A tolerance class, this bearing guarantees minimal runout and vibration, which is essential for ultra-precise applications.
High-Speed Capability: The lightweight phenolic resin cage and optimized internal design contribute to low friction and heat generation, supporting a high limiting speed of 100,000 rpm.
Sealed and Lubricated for Life: The sealed design with pre-applied grease protects against contamination and provides long-term, maintenance-free operation within the specified temperature range.
S71904 ACDGA/P4A Bearing Typical Application Areas
The S71904 ACDGA/P4A is ideally suited for high-performance applications, including:
- Machine Tool Spindles (High-speed machining centers, grinding spindles)
- Precision Robotics (Articulated arm joints, spindle drives)
- High-Frequency Motors and Spindle Drives
- Medical Equipment (Dental handpieces, laboratory centrifuges)
- Aerospace Instrumentation and Optical Scanning Systems
