7309 Series Angular Contact Ball Bearing | 15°-40° Contact Angle | Heavy-Duty Design

• Heavy-Duty Industrial Gearboxes
• Mining and Quarrying Equipment Drives
• Steel Mill Conveyor Drives
• Large Mixer and Agitator Drive Shafts
• Paper Mill Roll Drives
• Crane and Hoist Gear Mechanisms

• Large Multi-Stage Centrifugal Pumps
• Slurry and Process Pump Shafts
• Irrigation Pump Drives
• Marine Auxiliary Pump Systems
• High-Capacity Fan and Blower Drives

• Construction Machinery Drivetrains
• Agricultural Tractor Transmissions
• Forestry Equipment Drives
• Vibrating Screen Drives
• Rolling Mill Backup Roll Chocks

• Wind Turbine Yaw and Pitch Drives (Auxiliary)
• Generator Cooling Fan Supports
• Test and Measurement Equipment for Heavy Loads
• Industrial Robot Base Rotary Axes (High Load)
• Printing Press Cylinder Bearings

01. High Load-Carrying Capacity

Featuring a larger cross-section and optimized internal geometry, the 7309 Series provides significantly higher dynamic and static load ratings, ensuring longevity and reliability under strenuous operating conditions.

02. Enhanced System Rigidity and Stability

The bearing's design contributes to overall system stiffness, minimizing shaft deflection under heavy radial and axial loads, which is critical for maintaining precision and alignment in heavy machinery.

03. Versatile Configuration for Demanding Use

Available with standard contact angles (C=15°, AC=25°, B=40°) to match the specific load ratio of the application. Options include open designs, non-contact shields (ZZ), or contact seals (2RS) for adaptability to various environmental conditions.

Interchange Part Numbers

Direct replacement for:

• SKF: 7309 C, 7309 AC, 7309 B
• NSK: 7309C, 7309AC
• FAG: 7309 C, 7309 AC
• NTN: 7309C, 7309AC

Design & Configuration

The 7309 Series represents a robust size within the angular contact bearing range. It is commonly furnished as an open bearing to facilitate direct oil lubrication in industrial gearboxes and heavy machinery. For applications requiring built-in protection, steel shields (ZZ) or synthetic rubber seals (2RS) are standard options. Its versatility in mounting (single, paired, or in tandem) makes it suitable for complex load arrangements.

"For heavy industrial gearboxes and large pump shafts where load capacity and durability are paramount, the 7309 AC (25° contact angle) provides an excellent and widely specified solution.”