RN311M Precision Cylindrical Roller Bearing 55x106.5x29 Industrial Roller Bearing

RN311M Cylindrical Roller Bearing 55x106.5x29mm - Metal Cage, 2RS Seal, Industrial/Mining

I. Basic Parameters

Structural Design
RN311M is a single-row cylindrical roller bearing with a metal cage (identified by the suffix "M"). It consists of an inner ring, outer ring, cylindrical rollers, and a stamped steel cage. It features high radial load capacity and low frictional resistance, making it suitable for industrial scenarios with high requirements for rotational speed and load.

Dimensional Specifications

• Inner diameter: 55mm
• Outer diameter: 106.5mm
• Width: 29mm
• Weight: Approximately 1.0kg
  These dimensions comply with the ISO 15 size series standard and fit the installation space of common equipment such as reducers and textile machinery.

Material and Process

• Bearing steel: High-carbon chromium bearing steel (GCr15) is used, subjected to quenching and tempering treatment. The surface hardness reaches HRC58-62, providing excellent wear resistance and impact resistance.
• Machining precision: Raceway precision reaches class P5, with a surface roughness of Ra≤0.8μm, ensuring stable operation.

II. Performance Indicators

Load Capacity

• Dynamic radial load: Approximately 105kN
• Static radial load: Approximately 135kN
  It can withstand moderate impact loads, suitable for heavy-load working conditions such as mining machinery and printing equipment.

Rotational Speed Characteristics

• Rotational speed with grease lubrication: 4800r/min
• Rotational speed with oil lubrication: 6300r/min
  The cylindrical roller design reduces sliding friction between rolling elements and raceways, making it suitable for medium and high-speed operation.

Sealing and Lubrication

• Standard configuration: Double-sided rubber seal (2RS) with IP54 protection class, effectively blocking dust and moisture.
• Lubrication recommendation: Use lithium-based grease (NLGI Grade 2) with an operating temperature range of -30℃~+120℃. The maintenance cycle under normal working conditions is 2000 hours.

III. Application Fields

Industrial Machinery

• Reducers: Such as main transmission parts of cycloidal pinwheel reducers and gearboxes.
• Textile equipment: Used in high-precision transmission systems such as large cylinder motors and winding mechanisms.
• Mining machinery: Suitable for supporting shaft systems of crushers and conveyors.

Special Working Conditions

• Dusty environments: IP54 seal can handle dusty scenarios such as cement plants and quarries.
• Medium-temperature environments: The operating temperature range of -30℃~+120℃ covers most industrial environments.

IV. Installation and Maintenance

Installation Requirements

• Tool usage: Hydraulic or hot-fitting methods must be used for installation to avoid raceway damage from hammering.
• Coaxiality control: After installation, the radial runout of inner and outer rings must be ≤0.08mm to ensure operational precision.
• Bolt pre-tightening: The recommended torque for M16 mounting bolts is 220N・m (tightened in three gradient steps).

Maintenance Standards

• Lubrication inspection: Check the grease condition every 500 hours, replenish or replace if necessary.
• Seal monitoring: Regularly observe the wear of the seal ring and replace it in time to prevent leakage.
• Service life prediction: Analyze operating data through vibration monitoring equipment to estimate the remaining service life.

V. Technical Alternatives

Equivalent Model References

• Economic alternative: RN311 (nylon cage) with 90% of the load capacity of RN311M, suitable for light-load standard working conditions.
• High-protection type: RN311M/C3 (with increased clearance), suitable for scenarios with high temperatures or obvious shaft system expansion.

Performance Optimization Options

• High-speed type: Customized class P4 precision, with maximum rotational speed increased to 7000r/min.
• Long-life type: Using carburized steel material (e.g., 20CrMnTi), with a rated life L10 of up to 8000 hours.

VI. Certification and Inspection

Quality Control

• Factory inspection: 100% pass hardness, clearance, and sealing performance tests; sampled products undergo 200-hour life bench tests.
• Certification standards: Complies with international and domestic standards such as ISO 15 and GB/T 283; CE certification is available (customization required).