Angular Contact Ball Bearing:7404 AC / 7404 B

Description

Basic Parameters

In the angular contact ball bearing model 7404 AC / 7404 B, the digit “7” indicates that the bearing type is an angular contact ball bearing. The “40” represents the bearing size series, with “4” denoting the width series and “0” the diameter series in this context. The “04” signifies that the bearing’s inner diameter (bore diameter) is 20 millimeters (calculated as 04 × 5 mm according to standard bearing coding rules). The suffixes “AC” and “B” denote different contact angles, where “AC” typically indicates a 25 – degree contact angle and “B” a 40 – degree contact angle, affecting the bearing’s load – carrying capacity and application orientation. As a standard part, its external dimensions (such as outer diameter and width) follow industry – agreed specifications, ensuring interchangeability across manufacturers.

Product Application

Product Application The Angular Contact Ball Bearing 7404 AC/7404 B is designed for high-precision, high-speed applications requiring reliable radial and axial load management. Its 20 mm inner diameter and standardized external dimensions (outer diameter and width compliant with industry standards) make it ideal for compact mechanical systems where space efficiency is critical.

Key Application Scenarios:

Suitable for use in precision gearboxes, spindle drives, and motor shafts, where the bearing’s ability to handle combined radial and axial loads is essential. The “AC” variant (25° contact angle) excels in moderate axial load conditions with high rotational speeds, while the “B” variant (40° contact angle) is optimized for heavy axial loads in applications like conveyor systems or pump impellers.

Used in automotive transmissions, wheel hubs, and electric power steering systems, where it withstands dynamic loads and vibrations. The bearing’s standardized dimensions ensure easy interchangeability across different vehicle models, reducing maintenance complexity.

Applied in high-speed electric motors, generators, and precision instruments (e.g., CNC machines, robotics). The tight manufacturing tolerances of these bearings minimize noise and heat generation, critical for maintaining operational efficiency in sensitive electronic environments.

While primarily for auxiliary systems (e.g., landing gear actuators, flight control mechanisms), the bearing’s robust design and load-bearing capacity make it suitable for applications requiring consistent performance under varying operational conditions.

Installation & Operational Considerations:

Mounting: Typically used in pairs or sets to balance axial loads in both directions, especially in high-precision setups. Proper alignment and preload adjustment are critical to maximize service life.

Lubrication: Grease or oil lubrication is recommended based on speed and temperature requirements; periodic maintenance ensures optimal performance in dusty or high-moisture environments.

Environment: Resistant to moderate contaminants but should be protected with seals in harsh conditions to prevent debris ingress and extend operational life.

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