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6011 Bearing 55x90x18mm 30.2kN Load | RHD Bearings

Heavy-duty but not heavy-headed - carries 30.2kN loads but won't carry a grudge.

Meet the 6011: With 3078kg (30.2kN) of engineering excellence and 55mm precision, this bearing delivers the perfect blend of personality and performance for your critical applications. The most widely used bearing in electronics, small motors, and precision instruments.

55mm
Bore Diameter
90mm
Outer Diameter
18mm
Width
30.2 kN
Load Rating
3078 Kg
Load Capacity
0.362 Kg
Weight
Technical Specifications Applications 📞 Call +91-9702081858
6011 Bearing 55×90×18mm - RHD Bearings

6011 BEARING SPECIFICATIONS

Precision-engineered for reliability and performance

🔍 Common Search Terms

6011 bearing specifications 55mm bore bearing replacement 30.2kN load capacity bearing 6011 bearing dimensions deep groove ball bearing 55mm industrial bearing 6011

📏Dimensions

d - ID (Bore Diameter)
55mm
D - OD (Outer Diameter)
90mm
B - Width
18mm
d₁ - Shoulder Diameter
≈66.3mm
D₂ - Recess Diameter
≈81.5mm
r₁,₂ - Chamfer Radius
min. 1.1mm
6011 Bearing: 55 × 90 × 18mm

Cross-Sectional View

6011 Bearing Cross-Sectional View

⚡Load Ratings

Dynamic Load (Cr) 30.2kN
Static Load (Cor) 21.8kN
Load Capacity (kN) 30.2kN
Load Capacity (kg) 3078kg

💡What This Means

Dynamic Load (30.2kN): Maximum force while rotating. Exceeding this causes rapid wear and failure within hours.
Static Load (21.8kN): Maximum force when stationary. Use 80% for safety.
Calculate Your Load: Measure shaft forces, belt tensions, or gear loads. Include shock/vibration factors.
Failure Warning: Overloading causes bearing raceways to crack and balls to flatten permanently.

🔄Speed Limits

Grease Lubrication 7000 RPM
Oil Lubrication 8500 RPM
RHD Z2V2 Bearings 1400 RPM
RHD Z3V3 Bearings 2880 RPM
RHD Z4V4 Bearings 6000+ RPM

💡What This Means

Grease Limit (7000 RPM): Heat generation increases exponentially above this. Grease breaks down, causing seizure.
Oil Advantage (8500 RPM): Better heat dissipation allows higher speed. Required for high-speed spindles.
Safe Operating Speed: Use 90% of limit (6300 RPM) for maximum L10 life of 10,000+ hours.
Failure Mode: Exceeding speed causes cage failure, ball skidding, and catastrophic overheating within minutes.

🔧Material & Quality

Steel Grade SAE52100
Ball Grade G10
Carbon Content 0.95-1.05%
Chromium Content 1.40-1.65%
ISO Standard 15:2011 Compliant

💡What This Means

SAE52100 Chrome Steel: Premium bearing steel - harder than tool steel
G10 Balls: Ultra-precision balls with ±0.25µm tolerance
High Carbon: Superior hardness and wear resistance
Chromium: Adds corrosion resistance and toughness
ISO Standard: Fits any 6011 application worldwide

📊Vibration Classes

V2 Grade
Low: 210 μm/s
Med: 180 μm/s
High: 180 μm/s
V3 Grade
Low: 125 μm/s
Med: 110 μm/s
High: 110 μm/s
V4 Grade
Low: 95 μm/s
Med: 70 μm/s
High: 70 μm/s

💡What This Means

V2 Grade: Standard grade - good for general applications
V3 Grade: Low vibration - like a smooth car engine
V4 Grade: Ultra-smooth - for precision instruments
Frequency Bands: Measured across different rotation speeds

🔇Noise Levels

Z2 Grade < 52 dB
Z3 Grade < 49 dB
Z4 Grade (Quiet) < 49 dB
Application Precision Equipment

💡What This Means

Z2 Grade: Quiet as a library - good for most applications
Z3 Grade: Very quiet - like a whisper (40 dB = normal whisper)
Z4 Grade: Ultra-quiet - perfect for bedroom fans, medical equipment
Application: Ideal for sensitive environments

⚙️Internal Clearance

C2 (Tight) 1-15 μm
C0 (Normal) 8-28 μm
C3 (Loose) 23-43 μm
C4 (High Temp) 38-61 μm
C5 (Extra High Temp) 55-90 μm

💡What This Means

C2 (Tight): Precision applications - less play, more accurate
C0 (Normal): Standard choice - works for most applications
C3 (Loose): Better for hot environments - allows thermal expansion
C4 (Exta Loose): Hot or tight-fit setups — extra room for thermal expansion.
C5 (Max Loose): Extreme heat/tight fits or near-limit speeds — maximum expansion allowance

SEAL OPTIONS

Choose the right protection for your application

6011-ZZ

Most Popular

Double metal shields

Speed Factor: 0.9 (6300 RPM)
Protection: Dust protection
Lubrication: Sealed for life

When to Use 6011-ZZ

Best For: Electronics, small motors, skateboards, general machinery
Conditions: Dry environments, moderate dust, precision applications
Achieves: Excellent balance of speed and protection for most applications
Avoid When: Heavy water exposure, chemical environments, food processing

6011-2RS

Protected

Double rubber seals

Speed Factor: 0.7 (4900 RPM)
Protection: Moisture and dust
Lubrication: Sealed for life

When to Use 6011-2RS

Best For: Outdoor applications, appliances, automotive systems, dirty environments
Conditions: Moisture, dust, contamination, washdown areas, food processing
Achieves: Maximum protection and zero maintenance requirements
Trade-off: Lower speed limit but superior environmental protection

6011

High Speed

Open bearing, no seals

Speed Factor: 1.0 (7000 RPM)
Protection: None
Lubrication: External required

6011-Z

Balanced

Single metal shield

Speed Factor: 0.95 (6650 RPM)
Protection: Light dust protection
Lubrication: Pre-greased

6011-RS

Protected

Single rubber seal

Speed Factor: 0.8 (5600 RPM)
Protection: Moisture and dust
Lubrication: Pre-greased, sealed

APPLICATIONS

Precision performance across industries

Pump Drives

  • Centrifugal pump shafts
  • Hydraulic pump drives
  • Water transfer pumps
  • Oil pump shafts
  • Industrial fluid pumps
  • Chemical dosing pumps
  • Food grade pump shafts
  • Cooling system pump drives

Key Requirements: 55mm shaft with 30.20kN (≈3078kg) dynamic load, 7,000 RPM grease lubrication, 90×18mm for pump drives

Heavy Machinery

  • Material handling equipment
  • Mining haul trucks
  • Construction vehicle pivots
  • Industrial press bearings
  • Aggregate crusher shafts
  • Farm equipment joints
  • Bulk material movers
  • Industrial mixers

Key Requirements: Precision 55mm bore with 21.80kN (≈2223kg) static load for heavy-duty applications

Conveyor Rollers

  • Warehouse conveyor rollers
  • Sortation system pulleys
  • Assembly line conveyors
  • Mining belt rollers
  • Material transfer rollers
  • Bulk goods movers
  • Packaging conveyor spindles
  • Log transport rollers

Key Requirements: 55mm bore, 18mm width for high-load conveyor systems

Compatible Models & Shaft Requirements

Find bearings with the same bore size and ensure proper shaft preparation

🔄Related Models

6811 (55×72×9mm) 6911 (55×80×13mm) 16011 (55×90×11mm) 6211 (55×100×21mm) 62211 (55×100×25mm) 62311 (55×120×43mm) 6311 (55×120×29mm)

🔧Shaft Requirements

Nominal Diameter 55.000mm
Tolerance Grade h6 (54.981-55.000mm)
Surface Finish Ra 0.8μm max
Runout Tolerance 0.013mm max

🎯Application-Specific Options

High Temperature: C3 clearance recommended
High Speed: RHD V3 & V4 bearings recommended
Corrosive Environment: SS (Stainless Steel) bearings recommended

Professional Expertise & Standards

Technical insights from 20+ years of bearing engineering and manufacturing excellence

📋ISO Compliance

ISO 15:2011 compliant dimensions ensure interchangeability with global bearing standards and seamless replacement in existing equipment.

🔬Material Science

Gcr15 chrome steel composition optimized for heavy-duty applications, providing superior hardness, wear resistance, and fatigue life.

⚙️Precision Engineering

C0 clearance standard for most applications, C3 available for high-temperature use. h6 shaft tolerance recommended for optimal performance.

🔧Professional Installation

Professional installation required for maximum 50,000-hour service life. Proper tools and techniques prevent 80% of premature failures.

📊Performance Comparison

Shares the 55mm bore (ID) with 6811, 6911, 16011, so it can be considered where the shaft is fixed at 55mm. The 6011 is rated 30.20kN dynamic / 21.80kN static at 90mm OD — more capacity than the 6911 (15.90kN) and less than the heavier-duty 6211 (43.20kN).

💰Value Engineering

Best value in 55mm bearing category for 30.2kN performance. Quality bearings last 3-10x longer than cheap alternatives, reducing total cost of ownership.

FREQUENTLY ASKED QUESTIONS

Expert guidance for 6011 bearing applications

Bearing Selection & Replacement ▼

What clearance should I choose for the 6011 bearing?

C0 (normal clearance) is standard for most 6011 bearing applications, providing optimal performance under normal operating conditions.
Why This Matters
Proper clearance selection affects bearing performance, noise levels, and service life. Wrong clearance can cause premature failure or excessive wear.
How To Handle It
Use C0 clearance for standard applications. Consider C3 clearance for high-temperature applications or when thermal expansion is a concern.
For high-speed applications, C3 clearance may be beneficial as it accommodates thermal expansion and reduces friction.
Installation & Maintenance ▼

What is the expected service life of the 6011 bearing?

Under proper operating conditions, the 6011 bearing can provide 50,000+ hours of service life with appropriate maintenance and lubrication.
Why This Matters
Understanding expected service life helps with maintenance planning, inventory management, and total cost of ownership calculations.
How To Handle It
Monitor bearing condition regularly, maintain proper lubrication, and replace bearings before they reach end of life to prevent equipment damage.
Service life can vary significantly based on load, speed, temperature, and maintenance practices. Regular condition monitoring is essential.
Troubleshooting & Problem Solving ▼

How do I identify bearing failure in the 6011?

Common signs of 6011 bearing failure include increased noise, vibration, heat, and reduced performance or complete seizure.
Why This Matters
Early detection of bearing failure prevents catastrophic equipment damage and reduces downtime and repair costs.
How To Handle It
Implement regular condition monitoring, use vibration analysis, and establish maintenance schedules based on operating conditions.
Keep spare bearings in stock and establish emergency replacement procedures to minimize downtime when failures occur.
Cost & Performance Optimization ▼

How can I optimize the performance of my 6011 bearing?

Optimize 6011 bearing performance through proper installation, regular maintenance, appropriate lubrication, and monitoring operating conditions.
Why This Matters
Optimized performance extends bearing life, reduces maintenance costs, and improves overall equipment reliability and efficiency.
How To Handle It
Follow manufacturer guidelines, implement preventive maintenance, use quality lubricants, and monitor bearing condition regularly.
Keep detailed maintenance records and use condition monitoring to identify optimization opportunities and prevent problems before they occur.
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