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62304 Bearing 20x52x21mm | RHD Bearings

Twenty millimeter bore with the robust build of a linebacker who also does poetry.

Meet the 62304: With 1814kg (17.8kN) of engineering excellence and 20mm 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.

20mm
Bore Diameter
52mm
Outer Diameter
21mm
Width
17.8 kN
Load Rating
1814 Kg
Load Capacity
0.22 Kg
Weight
Technical Specifications Applications 📞 Call +91-9702081858
62304 Bearing 20×52×21mm - RHD Bearings

62304 BEARING SPECIFICATIONS

Precision-engineered for reliability and performance

🔍 Common Search Terms

62304 bearing specifications 20mm bore bearing with 52mm outer diameter 62304 bearing load capacity and speed rating 62304 bearing dimensions and weight 62304 bearing seal options and applications 62304 bearing cross reference and replacement

📏Dimensions

d - ID (Bore Diameter)
20mm
D - OD (Outer Diameter)
52mm
B - Width
21mm
d₁ - Shoulder Diameter
≈30.35mm
D₂ - Recess Diameter
≈44.71mm
r₁,₂ - Chamfer Radius
min. 1.1mm
62304 Bearing: 20 × 52 × 21mm

Cross-Sectional View

62304 Bearing Cross-Sectional View

⚡Load Ratings

Dynamic Load (Cr) 17.8kN
Static Load (Cor) 4.75kN
Load Capacity (kN) 17.8kN
Load Capacity (kg) 1814kg

ðŸ’ĄWhat This Means

Dynamic Load (17.8kN): Maximum force while rotating. Exceeding this causes rapid wear and failure within hours.
Static Load (4.75kN): 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 14000 RPM
Oil Lubrication 17000 RPM
RHD Z2V2 Bearings 1400 RPM
RHD Z3V3 Bearings 2880 RPM
RHD Z4V4 Bearings 6000+ RPM

ðŸ’ĄWhat This Means

Grease Limit (14000 RPM): Heat generation increases exponentially above this. Grease breaks down, causing seizure.
Oil Advantage (17000 RPM): Better heat dissipation allows higher speed. Required for high-speed spindles.
Safe Operating Speed: Use 90% of limit (12600 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

ðŸ’ĄWhat This Means

SAE52100 Chrome Steel: Premium bearing steel - harder than tool steel
G10 Balls: Ultra-precision balls with Âą0.25Âĩm tolerance
High Carbon: Superior hardness and wear resistance
Chromium: Adds corrosion resistance and toughness
ISO Standard: Fits any 62304 application worldwide

📊Vibration Classes

V2 Grade
Low: 130 Ξm/s
Med: 100 Ξm/s
High: 75 Ξm/s
V3 Grade
Low: 80 Ξm/s
Med: 60 Ξm/s
High: 45 Ξm/s
V4 Grade
Low: 60 Ξm/s
Med: 25 Ξm/s
High: 25 Ξm/s

ðŸ’ĄWhat 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 < 42 dB
Z3 Grade < 38 dB
Z4 Grade (Quiet) < 33 dB
Application Precision Equipment

ðŸ’ĄWhat 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

⚙ïļInternal Clearance

C2 (Tight) 0-10 Ξm
C0 (Normal) 5-20 Ξm
C3 (Loose) 13-28 Ξm
C4 (High Temp) 20-36 Ξm
C5 (Extra High Temp) 28-48 Ξm

ðŸ’ĄWhat 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

62304-ZZ

Most Popular

Double metal shields

Speed Factor: 0.9 (12600 RPM)
Protection: Dust protection
Lubrication: Sealed for life

When to Use 62304-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

62304-2RS

Protected

Double rubber seals

Speed Factor: 0.7 (9800 RPM)
Protection: Moisture and dust
Lubrication: Sealed for life

When to Use 62304-2RS

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

62304

High Speed

Open bearing, no seals

Speed Factor: 1.0 (14000 RPM)
Protection: None
Lubrication: External required

62304-Z

Balanced

Single metal shield

Speed Factor: 0.95 (13300 RPM)
Protection: Light dust protection
Lubrication: Pre-greased

62304-RS

Protected

Single rubber seal

Speed Factor: 0.8 (11200 RPM)
Protection: Moisture and dust
Lubrication: Pre-greased, sealed

APPLICATIONS

Precision performance across industries

HVAC Motors

  • Commercial HVAC blower shafts
  • Air handling unit fans
  • Refrigeration blowers
  • Ventilation exhaust motors
  • Heating unit fans
  • Portable fan motors
  • Roof ventilation fan drives
  • Cleanroom air circulators

Key Requirements: 20mm shaft with 12.0kN (≈1,220kg) dynamic load capacity, 12,000 RPM grease lubrication, 52×21mm profile for HVAC applications

Measurement Tools

  • Calibration device spindles
  • Precision rotary tables
  • Laboratory instrument pivots
  • Micrometer spindles
  • Scientific measurement arms
  • Test equipment pivots
  • Optical instrument movements
  • Robotic arm precision joints

Key Requirements: Precision 20mm bore with 6.2kN (≈630kg) static load rating for accurate positioning

Assembly Machinery

  • Automated assembly line spindles
  • Packaging equipment rollers
  • Material handling arms
  • Textile machinery rollers
  • Food processing line spindles
  • Printer drive shafts
  • Material feeder shafts
  • Small machine tool spindles

Key Requirements: 20mm bore, 21mm width for assembly and manufacturing machinery

Compatible Models & Shaft Requirements

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

🔄Related Models

62301 (12×37×17mm) 62302 (15×42×17mm) 62303 (17×47×19mm) 62305 (25×62×24mm)

🔧Shaft Requirements

Nominal Diameter 20.000mm
Tolerance Grade h6 (19.987-20.013mm)
Surface Finish Ra 0.8Ξm max
Runout Tolerance 0.013mm max

ðŸŽŊApplication-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 wide-bodied bearing applications, providing superior hardness, wear resistance, and fatigue life.

⚙ïļ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

Handles 4.8kN more load than typical 20mm bearings while maintaining compact design. Superior Gcr15 steel vs. standard steel in competing products.

💰Value Engineering

Best value in wide-bodied bearing category for 17.8kN performance. Quality bearings last 3-10x longer than cheap alternatives, reducing total cost of ownership.

FREQUENTLY ASKED QUESTIONS

Expert guidance for 62304 bearing applications

Bearing Selection & Replacement ▾

What makes 62304 bearing suitable for wide-bodied applications?

62304 features 21mm width (vs 12mm standard) providing enhanced load distribution and stability for demanding applications.
Why This Matters
Wide-bodied design reduces stress concentration, extends bearing life, and improves overall system reliability.
How To Handle It
Verify housing dimensions accommodate 21mm width and ensure proper alignment during installation.
Wide-bodied bearings are ideal for applications with high radial loads or where space allows for increased width.

Can 62304 replace standard 20mm bore bearings?

Yes, 62304 can replace standard 20mm bore bearings when enhanced load capacity and stability are required.
Why This Matters
Provides upgrade path for applications experiencing premature bearing failures or requiring higher load ratings.
How To Handle It
Check housing width compatibility (21mm vs 12mm standard) and verify load requirements match 1815.6kg (17.8kN) rating.
Always verify dimensional compatibility before replacement, especially width requirements.

What are the key advantages of 62304 over standard 20mm bearings?

62304 offers 21mm width, 1815.6kg (17.8kN) dynamic load capacity, and enhanced stability compared to standard 20mm bearings.
Why This Matters
Wide-bodied design provides superior load distribution, reduced stress, and extended service life.
How To Handle It
Evaluate application requirements and space constraints to determine if wide-bodied design is beneficial.
Consider 62304 for applications with high radial loads or where bearing life is critical.
Installation & Maintenance ▾

What are the proper installation procedures for 62304 bearing?

Use proper tools, maintain cleanliness, apply appropriate force, and ensure correct alignment for 62304 installation.
Why This Matters
Proper installation prevents damage, ensures optimal performance, and maximizes bearing service life.
How To Handle It
Clean shaft and housing, use bearing puller/installer, apply force to inner ring only, and verify smooth rotation.
Never apply force to outer ring during installation as it can damage bearing components.

How often should 62304 bearing be lubricated?

Lubrication frequency depends on operating conditions, speed, and load, typically every 6-12 months for normal applications.
Why This Matters
Proper lubrication reduces friction, prevents wear, and extends bearing service life significantly.
How To Handle It
Use high-quality grease suitable for bearing application, apply appropriate quantity, and monitor lubrication condition regularly.
Over-lubrication can cause overheating, while under-lubrication leads to premature failure.

What maintenance practices extend 62304 bearing life?

Regular inspection, proper lubrication, contamination control, and monitoring operating conditions extend 62304 bearing life.
Why This Matters
Proactive maintenance prevents premature failures, reduces downtime, and optimizes system performance.
How To Handle It
Establish maintenance schedule, monitor vibration and temperature, and replace bearings before catastrophic failure.
Keep detailed maintenance records to identify patterns and optimize maintenance intervals.
Troubleshooting & Problem Solving ▾

What causes 62304 bearing premature failure?

Common causes include contamination, improper lubrication, misalignment, overloading, and incorrect installation.
Why This Matters
Identifying failure causes helps prevent recurrence and improves system reliability.
How To Handle It
Analyze failed bearing, check operating conditions, and implement corrective measures.
Keep failed bearings for analysis to identify root causes and prevent future failures.

How to diagnose 62304 bearing problems?

Monitor vibration, temperature, noise levels, and visual inspection to diagnose 62304 bearing problems.
Why This Matters
Early detection allows for planned maintenance and prevents catastrophic failures.
How To Handle It
Use vibration analysis tools, infrared thermography, and regular visual inspections.
Establish baseline measurements when bearing is new to detect changes over time.

What are signs of 62304 bearing wear?

Signs include increased vibration, temperature rise, noise changes, and visual wear patterns on raceways and balls.
Why This Matters
Early detection of wear allows for planned replacement and prevents unexpected failures.
How To Handle It
Monitor operating parameters, perform regular inspections, and replace bearings when wear exceeds limits.
Document wear patterns to improve bearing selection for future applications.
Cost & Performance Optimization ▾

How does 62304 bearing compare in cost-performance ratio?

62304 offers excellent cost-performance ratio with 1815.6kg (17.8kN) load capacity and extended service life.
Why This Matters
Optimal cost-performance ratio reduces total cost of ownership and improves system efficiency.
How To Handle It
Compare initial cost vs. service life, maintenance requirements, and performance benefits.
Consider total cost of ownership, not just initial purchase price.

What factors affect 62304 bearing total cost of ownership?

Factors include initial cost, service life, maintenance requirements, downtime costs, and replacement frequency.
Why This Matters
Understanding total cost of ownership helps make informed decisions and optimize system performance.
How To Handle It
Calculate all costs over bearing service life and compare with alternatives.
Quality bearings often provide lower total cost of ownership despite higher initial cost.

How to optimize 62304 bearing performance and reduce costs?

Optimize through proper selection, installation, lubrication, and maintenance practices.
Why This Matters
Optimized performance reduces operating costs, extends service life, and improves system reliability.
How To Handle It
Follow manufacturer recommendations, implement preventive maintenance, and monitor performance.
Invest in proper tools and training for installation and maintenance to maximize bearing performance.
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