N310EM Cylindrical Roller Bearing 50x110x27 For Mining Machinery

N310EM Cylindrical Roller Bearing 50x110x27mm - Steel Cage, Industrial & Mining Applications

I. Core Technical Parameters & Structural Design

The N310EM is a single-row cylindrical roller bearing featuring a ribless inner ring and double-ribbed outer ring, designed for industrial scenarios dominated by radial loads. Its key parameters are as follows:

Structural Features:

1. Roller Design:
   • 15% more rollers reduce contact stress by 20% and extend service life by 30%.
   • Optimized chamfers on roller ends minimize edge stress concentration, suitable for vibrating environments (e.g., mining machinery).
2. Cage Technology:
   • EM suffix: Indicates a machined steel cage, which offers 40% higher rigidity than stamped steel cages, ideal for high speeds (DN value up to 6,000).
   • Optional brass cage (N310EM-Cu) enhances corrosion resistance for humid or chemical environments.
3. Material & Process:
   • Inner/outer rings and rollers use fully hardened high-carbon chromium bearing steel (GCr15), treated with vacuum quenching to improve wear resistance by 25% compared to standard bearings.

II. Performance Advantages & Application Fields

1. High Radial Load Capacity:
   • Radial load capacity is 2.5x higher than deep groove ball bearings of the same size, suitable for gearbox main shafts, conveyor rollers, and other heavy-load scenarios.
   • Can be paired with HJ310 adapter sleeves to compensate for shaft installation errors (allowing radial runout ≤0.08 mm).
2. High-Speed Stability:
   • The steel cage design reduces centrifugal force impact; vibration levels ≤3.5 mm/s at 6,000 r/min (per ISO 10816), suitable for machine tool spindles, high-speed motors.
   • Optional C3 clearance adapts to environments with large temperature fluctuations (e.g., hot rolling mills with temperature differences ≥80°C).
3. Long Service Life & Low Maintenance:
   • Roller-guided technology minimizes cage wear; wear ≤0.01 mm after 10,000 hours of continuous operation.
   • Standard open design supports high-temperature grease (-30°C ~ +120°C) or oil mist lubrication, extending maintenance intervals by 50%.

Typical Applications:

• Industrial Machinery: Reducer main bearings, textile machine roller shafts, woodworking machine cutting spindles.
• Mining Equipment: Crusher roller shafts, vibrating screen drive shafts (resistant to dust and impact loads).
• Machine Tools: Spindle supports for lathes and grinders (paired with precision installation to ensure radial runout ≤0.03 mm).
• Power Equipment: Rotor bearings for small generators (adapting to high speeds and low vibration requirements).

III. Installation & Maintenance Guidelines

1. Installation Key Points:
   • Shaft & housing tolerances: Shaft uses m6 tolerance; housing uses J7 tolerance to ensure interference fit stability.
   • Hot fitting process: Heating temperature ≤120°C (to avoid material annealing); recheck radial clearance after cooling (target: 0.02–0.04 mm).
   • Alignment precision: Use a laser alignment tool to ensure shaft parallelism ≤0.05 mm/m, preventing premature failure from eccentric loads.
2. Lubrication Strategy:
   • Initial lubrication: Fill with NLGI Grade 2 lithium-based grease (containing MoS₂) at 1/3 of the bearing’s internal volume.
   • Relubrication interval: Refill every 2,000 hours under continuous operation; for high-temperature environments (>80°C), use synthetic ester oil with a flow rate of 0.5–1 L/min.
3. Condition Monitoring:
   • Vibration monitoring: Use acceleration sensors with an alarm threshold ≥4.5 mm/s (RMS value).
   • Temperature monitoring: Check bearing housing temperature with an infrared thermometer; shut down immediately if abnormal temperature rise (>20°C/h) occurs.

IV. Technical Alternatives & Selection Recommendations

1. Cost-Effective Alternatives:
   • N310E (stamped steel cage): 15% lower cost but 20% reduced high-speed performance, suitable for light-load, low-speed scenarios (e.g., conveyor idlers).
2. Special Environment Variants:
   • N310EM-Cu (brass cage): 3x improved corrosion resistance, ideal for food processing or chemical equipment.
   • N310ECP (nylon cage): 40% lighter, suitable for high-speed, low-noise applications (e.g., medical equipment).
3. Certifications & Compliance:
   • Standard models comply with ISO 15 dimension standards and GB/T 283 load ratings; RoHS-compliant versions are available (lead content ≤0.1%).
   • For EU markets, choose CE-certified models to ensure electromagnetic compatibility and safety.

V. Selection & Procurement Advice

1. Parameter Verification:
   • Confirm shaft tolerance, installation space, and load spectrum (static/dynamic ratio) to avoid shortened service life from overloading.
   • For frequent start-stop conditions, select C4 clearance models to reduce startup torque.
2. Supplier Qualifications:
   • Prioritize manufacturers certified to IATF 16949 (e.g., ZWZ, NSK) to ensure batch consistency.
   • Request material flaw detection reports (e.g., ultrasonic testing) and life test data to verify actual performance.
3. Inventory & Delivery:
   • Standard models are readily available; customized options (e.g., special clearances, coatings) have a 4–6 week lead time.
   • Consider consignment inventory to reduce customer stock pressure and capital occupation.

The N310EM stands out for its cost-effectiveness, easy maintenance, and wide temperature adaptability, making it a preferred choice for small-to-medium mechanical transmission systems. Its steel cage design balances rigidity and economy, performing excellently in metallurgy, mining, and machine tool industries. Flexible configurations of clearances and cage materials allow it to meet diverse application needs.