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6008 Bearing 40x68x15mm | RHD Bearings

The workhorse that never calls in sick - 40mm bore of 'I've got this handled' energy.

Meet the 6008: With 1732kg (17.0kN) of engineering excellence and 40mm 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.

40mm
Bore Diameter
68mm
Outer Diameter
15mm
Width
17.0 kN
Load Rating
1732 Kg
Load Capacity
0.185 Kg
Weight
Technical Specifications Applications 📞 Call +91-9702081858
6008 Bearing 40×68×15mm - RHD Bearings

6008 BEARING SPECIFICATIONS

Precision-engineered for reliability and performance

🔍 Common Search Terms

40mm bearing heavy duty applications 6008 bearing load capacity specifications workhorse bearing 40x68x15 dimensions construction equipment bearing 40mm heavy duty bearing Mumbai supplier industrial machinery bearing 40mm

📏Dimensions

d - ID (Bore Diameter)
40mm
D - OD (Outer Diameter)
68mm
B - Width
15mm
d₁ - Shoulder Diameter
≈49.25mm
D₂ - Recess Diameter
≈61.1mm
r₁,₂ - Chamfer Radius
min. 1.0mm
6008 Bearing: 40 × 68 × 15mm

Cross-Sectional View

6008 deep groove ball bearing technical drawing showing cross-sectional view, dimensions and specifications

⚡Load Ratings

Dynamic Load (Cr) 17.0kN
Static Load (Cor) 11.8kN
Load Capacity (kN) 17.0kN
Load Capacity (kg) 1732kg

💡What This Means

Dynamic Load (17.0kN): Maximum force while rotating. Exceeding this causes rapid wear and failure within hours.
Static Load (11.8kN): 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 9000 RPM
Oil Lubrication 11000 RPM
RHD Z2V2 Bearings 1400 RPM
RHD Z3V3 Bearings 2880 RPM
RHD Z4V4 Bearings 6000+ RPM

💡What This Means

Grease Limit (9000 RPM): Heat generation increases exponentially above this. Grease breaks down, causing seizure.
Oil Advantage (11000 RPM): Better heat dissipation allows higher speed. Required for high-speed spindles.
Safe Operating Speed: Use 90% of limit (8100 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 6008 application worldwide

📊Vibration Classes

V2 Grade
Low: 180 μm/s
Med: 150 μm/s
High: 130 μm/s
V3 Grade
Low: 110 μm/s
Med: 90 μm/s
High: 80 μm/s
V4 Grade
Low: 82 μm/s
Med: 50 μm/s
High: 50 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 < 46 dB
Z3 Grade < 42 dB
Z4 Grade (Quiet) < 42 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) 1-11 μm
C0 (Normal) 6-20 μm
C3 (Loose) 15-33 μm
C4 (High Temp) 28-46 μm
C5 (Extra High Temp) 40-64 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

6008-ZZ

Most Popular

Double metal shields

Speed Factor: 0.9 (8100 RPM)
Protection: Dust protection
Lubrication: Sealed for life

When to Use 6008-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

6008-2RS

Protected

Double rubber seals

Speed Factor: 0.7 (6300 RPM)
Protection: Moisture and dust
Lubrication: Sealed for life

When to Use 6008-2RS

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

6008

High Speed

Open bearing, no seals

Speed Factor: 1.0 (9000 RPM)
Protection: None
Lubrication: External required

6008-Z

Balanced

Single metal shield

Speed Factor: 0.95 (8550 RPM)
Protection: Light dust protection
Lubrication: Pre-greased

6008-RS

Protected

Single rubber seal

Speed Factor: 0.8 (7200 RPM)
Protection: Moisture and dust
Lubrication: Pre-greased, sealed

APPLICATIONS

Precision performance across industries

Gearbox Shafts

  • Automotive gearbox shafts
  • Transmission input shafts
  • Industrial gear reducers
  • Heavy machinery gear shafts
  • Excavator drive shafts
  • Crane gearbox shafts
  • Mining haul truck gears
  • Agricultural machinery shafts

Key Requirements: 40mm shaft with 17.00kN (≈1732kg) dynamic load, 9,000 RPM grease lubrication, 68×15mm profile for gearboxes

Robot Joints

  • Industrial robot elbows
  • Automated welding arms
  • Assembly line robot joints
  • Robotic grippers
  • Material handling robots
  • CNC machining robots
  • Inspection robotic arms
  • Medical robot joints

Key Requirements: Precision 40mm bore with 11.80kN (≈1203kg) static load for robotic arms

Heavy Drives

  • Packaging machine drives
  • Conveyor main shafts
  • Pump motor drives
  • Hydraulic system shafts
  • Industrial mixer drives
  • Large fan motor shafts
  • Agricultural equipments
  • Mining conveyor shafts

Key Requirements: 40mm bore, 15mm width, durable and strong for heavy drive applications

Compatible Models & Shaft Requirements

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

🔄Related Models

6808 (40×52×7mm) 6908 (40×62×12mm) 16008 (40×68×9mm) 62208 (40×80×23mm) 6208 (40×80×18mm) 6308 (40×90×23mm) 62308 (40×90×33mm)

🔧Shaft Requirements

Nominal Diameter 40.000mm
Tolerance Grade h6 (39.984-40.000mm)
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 continuous heavy-duty performance, 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 service life. Proper tools and techniques prevent 80% of premature failures.

📊Performance Comparison

Shares the 40mm bore (ID) with 6808, 6908, 16008, so it can be considered where the shaft is fixed at 40mm. The 6008 is rated 17.00kN dynamic / 11.80kN static at 68mm OD — more capacity than the 6908 (13.70kN) and less than the heavier-duty 62208 (22.50kN).

💰Value Engineering

Excellent value for heavy-duty applications. Quality bearings last 3-10x longer than cheap alternatives, reducing total cost of ownership.

FREQUENTLY ASKED QUESTIONS

Expert guidance for 6008 bearing applications

Bearing Selection & Replacement ▼

Can a 6008 bearing handle 1800kg loads in heavy machinery?

Close but not recommended - 6008 handles 1734kg (1734.0kg (17.0kN)), just under your 1800kg requirement.
Why This Matters
Operating at or above rated capacity significantly reduces bearing life and increases failure risk. The 66kg difference represents about 4% overload, which can reduce bearing life by 20-30% in continuous heavy-duty operation. Heavy machinery requires reliable workhorse performance with adequate safety margins.
How To Handle It
Consider 6009 or 6208 series for loads approaching 1800kg. If space constraints require 6008, ensure perfect alignment, premium lubrication, eliminate shock loads, and implement comprehensive condition monitoring.
Workhorse applications need 15-20% safety margin for continuous operation - for 1800kg loads, specify bearings rated at least 2100kg capacity.

What's the difference between 6008 and smaller 6007 bearings?

6008 has 40mm bore vs 6007's 35mm bore, providing higher load capacity with increased dimensions.
Why This Matters
The 5mm bore increase provides higher load capacity (1734kg vs 1652kg) with 1mm additional width (15mm vs 14mm). This makes 6008 ideal for applications requiring higher loads on 40mm shafts. The size increase provides good capacity improvement for workhorse applications.
How To Handle It
Evaluate shaft size requirements - 40mm shafts are common in heavy construction and industrial equipment. Compare load requirements against the capacity difference. Consider the width increase impact on mounting requirements.
6008 provides 5% higher load capacity than 6007 with 7% width increase - good scaling for workhorse applications.

Is 6008 suitable for 40mm continuous-duty industrial shafts?

Excellent choice for continuous-duty industrial applications requiring reliable workhorse performance on 40mm shafts.
Why This Matters
Continuous-duty industrial applications subject bearings to sustained loads, extended operation, and demanding conditions. The 6008's 1734kg capacity and robust construction handle continuous operation requirements while premium Gcr15 steel provides durability for extended service life.
How To Handle It
Use sealed versions (6008-ZZ) for contaminated industrial environments. Implement systematic condition monitoring and maintenance schedules. Consider automatic lubrication systems for continuous operation.
Sealed bearings (6008-ZZ) provide 3-5 years of maintenance-free service in continuous industrial applications.
Installation & Maintenance ▼

What tools are needed to install a 185g 6008 bearing properly?

Heavy-duty installation tools, induction heater, and precision alignment equipment for proper 40mm bore installation.
Why This Matters
Proper installation prevents 80% of premature bearing failures. The 185g weight and 40mm bore require appropriate techniques to prevent damage. Large bearings benefit from thermal installation and precision alignment for maximum service life in workhorse applications.
How To Handle It
Heat bearing to 80-90°C using induction heater for uniform heating. Use heavy-duty hydraulic tools with proper adapters. Verify shaft tolerances (h6: 39.987-40.013mm) and housing concentricity. Never use impact methods.
Large bearings require controlled thermal installation - induction heating provides uniform expansion preventing installation damage.

How often should I inspect a 6008 bearing running at 8000 RPM?

Bi-weekly inspections for bearings operating at 8000 RPM, at 89% of the 9000 RPM rating in workhorse applications.
Why This Matters
Operating at 89% of rated speed with heavy loads in continuous service requires frequent monitoring. Large bearings under sustained loads benefit from systematic monitoring to optimize maintenance timing and prevent costly equipment failures.
How To Handle It
Monitor temperature, noise, and vibration bi-weekly. Check lubrication condition and contamination levels. Document measurements for trend analysis and predictive maintenance scheduling.
Continuous-duty applications benefit from automated monitoring - wireless sensors provide real-time bearing health data for workhorse equipment.

What lubrication schedule works for 6008 in continuous industrial operation?

Relubricate every 2000-3000 operating hours for continuous industrial operation depending on operating conditions.
Why This Matters
Continuous industrial operation subjects bearings to sustained loads and extended operation requiring consistent lubrication management. The 6008's size allows good grease capacity while continuous conditions accelerate lubricant degradation over time.
How To Handle It
Use high-quality industrial lithium complex grease for continuous operation. Monitor grease condition regularly. For 24/7 operation, consider automatic lubrication systems to ensure consistent supply.
Automatic lubrication systems extend intervals to 5000+ hours while improving reliability in continuous industrial applications.
Troubleshooting ▼

Why does my 6008 bearing overheat under 1600kg loads?

1600kg is well within capacity - check lubrication adequacy, heat dissipation, and operating environment systematically.
Why This Matters
Operating at 92% of rated capacity should not cause overheating with proper conditions. Overheating indicates lubrication problems, inadequate heat dissipation, or environmental factors requiring investigation in continuous-duty applications.
How To Handle It
Verify lubrication quantity, quality, and heat dissipation capability. Check for adequate cooling and ventilation. Inspect for contamination or environmental heat sources affecting bearing temperature.
Workhorse bearings generate significant heat - ensure adequate cooling systems and heat dissipation paths for continuous operation.

What causes rattling noise in 6008 bearings at 7500 RPM?

Rattling noise at 7500 RPM indicates wear, loose mounting, or contamination requiring immediate attention.
Why This Matters
Operating at 83% of rated speed should produce smooth operation. Rattling indicates mechanical problems that will worsen rapidly. Large bearings are sensitive to mounting issues and contamination affecting smooth operation.
How To Handle It
Stop operation and inspect mounting tightness, bearing clearances, and contamination. Check for wear, loose components, or foreign material. Address mounting and contamination issues before resuming operation.
Rattling in large bearings often indicates mounting problems - verify all fasteners are properly torqued and surfaces are clean.

How do I diagnose problems with 40mm 6008 bearings in continuous equipment?

Use comprehensive monitoring including temperature, vibration, noise, and lubrication analysis for continuous operation.
Why This Matters
Continuous operation bearings require comprehensive diagnostics due to sustained loading and extended service requirements. The 40mm size provides good mass for vibration analysis while requiring systematic monitoring for reliable assessment.
How To Handle It
Establish baseline measurements for temperature, vibration, noise, and lubricant condition. Use thermal imaging, vibration analysis, and acoustic monitoring. Implement trending analysis for predictive maintenance in continuous service.
Continuous operation requires trend analysis - gradual changes over time indicate developing problems requiring maintenance attention.
Cost & Performance ▼

Is it worth upgrading from 1600kg to 6008's 1734kg capacity?

Yes, the extra 134kg capacity provides 8% safety margin and extended service life in workhorse applications.
Why This Matters
Higher load capacity reduces stress levels, extending bearing life in continuous heavy-duty applications. The cost difference is minimal compared to replacement costs, downtime, and production losses from failures in continuous operation equipment.
How To Handle It
Calculate total ownership cost including replacement labor, equipment downtime, and maintenance intervals. Consider continuous operation requirements and safety factors. Evaluate current performance patterns.
8% capacity margin provides measurable life extension in continuous applications - good return on investment for workhorse equipment.

When should I pay more for bearings rated above 9000 RPM?

Only when operating speeds regularly exceed 8000 RPM or require speed capability for equipment optimization.
Why This Matters
Higher speed ratings require tighter tolerances and premium materials, increasing cost. The 9000 RPM rating handles most heavy-duty industrial applications. Overpaying for unnecessary speed capability reduces value in workhorse applications.
How To Handle It
Analyze actual operating speeds including all conditions. Consider equipment optimization needs and future requirements. Compare premium cost against specific performance benefits in continuous operation.
Workhorse applications typically prioritize capacity and reliability over speed - focus budget on durability features rather than unnecessary speed ratings.

What's the cost difference between 6008 and larger 6009 bearings?

6009 costs 20-25% more than 6008 but provides higher load capacity for 45mm vs 40mm shafts.
Why This Matters
Size progression involves cost increases with capacity improvements. The 5mm shaft difference may require design changes but offers load capacity increase. Understanding scaling helps optimize selection for workhorse applications.
How To Handle It
Compare load requirements against shaft size modification costs. Evaluate if design changes for larger shaft are justified by improved capacity and reliability in continuous operation.
The 5mm size increase provides capacity improvement - consider when design modifications are feasible for workhorse equipment.
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