N310EM Cylindrical Roller Bearing 50x110x27mm Heavy Duty Brass Cage Mining Industrial

I. Core Parameters and Structural Design

The N310EM is a single-row cylindrical roller bearing featuring a brass cage (identified by the suffix "EM"). It consists of an inner ring, outer ring, cylindrical rollers, and a machined brass cage. Its structural characteristics include high radial load capacity and low frictional resistance, making it suitable for heavy-load, medium-to-high-speed working conditions.

Key Dimensions:

• Inner diameter (d): 50mm
• Outer diameter (D): 110mm
• Width (B): 27mm
• Weight: Approximately 1.11kg

These dimensions comply with the ISO 15 size series standard, ensuring compatibility with the mounting interfaces of equipment such as reducers and mining machinery.

Material and Manufacturing Process:

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

II. Performance Indicators

1. Load Capacity
   • Dynamic radial load (Cₐ): Approximately 87kN
   • Static radial load (C₀ₐ): Approximately 86kN

   It can withstand moderate impact loads, making it suitable for heavy-load scenarios such as crushers and conveyors.

2. Speed Characteristics
   • Speed with grease lubrication: 5600r/min
   • Speed with oil lubrication: 6700r/min

   The cylindrical roller design reduces sliding friction, enabling it to operate at medium to high speeds.

3. Sealing and Lubrication
   • Standard configuration: Open design (no built-in seals), requiring external sealing devices to adapt to dusty or humid environments.
   • Lubrication recommendation: Use lithium-based grease (NLGI Grade 2) with an operating temperature range of -30℃~+120℃. The regular maintenance interval under normal conditions is 2000 hours.

III. Application Fields

1. Industrial Machinery
   • Reducers: Main transmission parts of gearboxes, such as cycloidal pinwheel reducers.
   • Mining equipment: Support shafts of crushers and conveyors.
   • Electrical machinery: Motor bearings and main shaft support of fans.
2. Special Working Conditions
   • Dusty environments: Requires matching with external seals (e.g., labyrinth seals), suitable for cement plants and quarries.
   • Medium-temperature environments: The operating temperature range of -30℃~+120℃ covers most industrial scenarios.

IV. Installation and Maintenance

1. Installation Requirements
   • Tools: Hydraulic or hot mounting methods are recommended (heating temperature ≤120℃) to avoid raceway damage from hammering.
   • Coaxiality control: After installation, the radial runout of inner and outer rings should be ≤0.08mm to ensure operational precision.
   • Bolt preload: M16 mounting bolts are recommended to be tightened to 220N·m (tightened in three gradient steps).
2. Maintenance Standards
   • Lubrication inspection: Check grease condition every 500 hours; shorten the interval in high-temperature environments.
   • Seal monitoring: Regularly inspect wear of external seals and replace them promptly to prevent leakage.
   • Service life prediction: Analyze operational data through vibration monitoring equipment to estimate remaining service life.

V. Technical Alternatives

1. Equivalent Model References
   • Economic alternative: N310 (nylon cage), with 95% of the load capacity of N310EM, suitable for light-load standard working conditions.
   • High-protection type: N310EM/C3 (with increased clearance), suitable for high-temperature environments or scenarios with significant shaft system expansion.
2. Performance Optimization Options
   • High-speed type: Customizable to class P4 precision, with a maximum speed increased to 7000r/min.
   • Long-life type: Using carburized steel (e.g., 20CrMnTi), with a rated life L10 of up to 8000 hours.

VI. Certification and Inspection

1. 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 (customizable).

Selection Recommendations

• Prioritize N310EM for working conditions involving impact loads, high temperatures, or long service life requirements (e.g., mining machinery, metallurgical equipment).
• Consider alternative models (e.g., N310 with a nylon cage) if cost reduction or lightweighting is needed, but note its temperature resistance limitation (≤80℃).

In practical applications, it is recommended to conduct system matching analysis using professional software based on working condition parameters (speed, load, temperature) to ensure reliability.