71956 ACD/HCP4ADGA
Hybrid Ceramic Super Precision Bearings
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Main Dimensions
Ball & Washer Dimensions
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71956 ACD/HCP4ADGA Bearing Product Overview & Core Advantages
The 71956 ACD/HCP4ADGA is a precision angular contact ball bearing engineered for the most demanding applications. Its universal matchable (SU) design allows for flexible mounting in pairs to support combined loads—significant radial and bidirectional axial loads—simultaneously. Manufactured to the exacting P4A tolerance class, this bearing guarantees exceptional running accuracy and system rigidity. The combination of a ceramic ball material and a phenolic cage contributes to superior high-speed performance and reduced rotating mass, making it an ideal choice for high-precision, high-reliability spindles and machinery.
71956 ACD/HCP4ADGA Bearing Model Code Explained, Specifications & Naming Convention
- 71956: Basic series number, defining the bearing dimensions (280mm bore, 380mm OD, 92mm width).
- ACD: Designates Angular Contact with a 25° contact angle and a specific internal design optimized for high performance.
- HC: Indicates the use of Hybrid Ceramic balls (steel rings with ceramic balls).
- P4A: Denotes the tolerance class, signifying very high precision levels for dimensional and running accuracy.
- DGA: Specifies a Universal Matchable (SU) arrangement. Two bearings can be paired in a "back-to-back" (DB), "face-to-face" (DF), or tandem (DT) configuration to optimize load handling and system stiffness.
71956 ACD/HCP4ADGA Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The angular contact design and universal matchable feature enable the bearing to be preloaded in pairs, creating an exceptionally rigid bearing system capable of handling high combined loads.
Superior High-Speed Performance: The hybrid ceramic construction, featuring silicon nitride balls, significantly reduces centrifugal forces and friction, allowing for a higher limiting speed. The lightweight phenolic cage further enhances stability and speed capability.
Precision & Longevity: Manufactured to P4A tolerance standards, this bearing ensures minimal runout and vibration. The open seal type is intended for systems with external lubrication, facilitating optimal cooling and cleanliness for maximum service life in controlled environments.
71956 ACD/HCP4ADGA Bearing Typical Application Areas
This high-performance bearing is ideally suited for applications requiring extreme precision, high rigidity, and elevated rotational speeds. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling machines and precision engraving equipment.
- High-Frequency Motors: Spindles for electric motors operating at very high RPM.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and other critical rotating assemblies.
