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
- 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.
- 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.
- 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
- 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.
- 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
- 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).
- 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
- 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.
- 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
- 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.