Product Overview
This page provides a detailed engineering and procurement reference for the 6005, intended for buyers verifying exact bearing specifications and functional interchangeability before ordering.
As the most widely used bearing type globally, the 6005 Single Row Deep Groove Ball Bearing is specifically developed by ZQM Bearings to sustain continuous operation in medium-load, high-speed environments. Primarily utilized in electric motors, household appliances, and automotive transmissions, this model is the engineering choice for procurement professionals seeking a reliable replacement that meets rigorous ISO standards for noise reduction and fatigue resistance. Its deep raceway grooves and close conformity between the balls and raceways enable the 6005 to manage substantial radial loads while accommodating axial forces in both directions, even at extreme rotational velocities.
Design & Engineering Advantages
The 6005 is synthesized from premium vacuum-degassed GCr15 high-carbon chromium bearing steel. This material selection is a calculated engineering decision to mitigate the risk of fatigue spalling by controlling oxygen content to sub-5 ppm. In high-speed deep groove ball bearings, steel purity directly correlates to the fatigue limit and vibration damping; our controlled manufacturing processes ensure that the 6005 maintains superior Hertzian contact stress distribution across the raceways. The precision-honed raceways are designed to minimize friction torque, which is essential for reducing heat generation in high-speed applications like electric motor armatures.
The internal geometry is optimized with a standard CN internal clearance (with C3 options available), ensuring the bearing operates within safe thermal envelopes even under significant temperature gradients. The 47 mm outside diameter (D) and 25 mm bore (d) provide a compact footprint with high structural rigidity. The 12 mm width (B) ensures a stable load path, contributing to the dynamic load rating of 11.9 kN. Unlike complex roller bearings, the 6005 features a simplified design with a pressed steel cage, which provides exceptional self-guiding characteristics and resists boundary lubrication failure. This design ensures dimensional stability up to 120°C (248°F) as standard, with higher stability heat treatment available for specialized industrial service cycles.
Key Features
- High-purity vacuum-degassed GCr15 steel for maximum fatigue life.
- Deep raceway geometry for combined radial and axial load versatility.
- Low-friction pressed steel cage for high-speed thermal stability.
- Precision Grade P6 (ISO Class 6) as standard for low noise and vibration.
- Universal interchangeability with global ISO/DIN standard 6005 series.
Boundary Dimensions
| Designation | 6005 |
| Bore diameter (d) | 25 mm |
| Outside diameter (D) | 47 mm |
| Width (B) | 12 mm |
Procurement Selection
From a TCO (Total Cost of Ownership) perspective, the procurement of the 6005 represents a strategic decision to standardize on a high-availability, high-reliability component. Engineering teams should prioritize this model for high-speed, low-to-medium load applications where maintenance access might be limited. The functional interchangeability of the ZQM 6005 ensures that procurement verification is straightforward, matching the d/D/B dimensions and performance ratings of brands like SKF, FAG, and NSK. When selecting between open, shielded (ZZ), or sealed (2RS) variants, engineers must consider the lubrication reliability and contamination risks of the specific operating environment. For most electric motor applications, the open 6005 provides the lowest friction torque, provided the housing lubrication system is maintained according to the Limiting Speed of 20,000 r/min.
Cross-reference & Replacement
| ZQM Model | Reference Brand | Reference Model | Equivalence Basis |
|---|---|---|---|
| 6005 | SKF | 6005 | ISO Dimensional conformity |
| 6005 | FAG | 6005 | Installation interchangeability |
| 6005 | NSK | 6005 | Internal geometry compatibility |
The 6005 is specifically engineered for replacement evaluation across a vast range of industrial equipment. ZQM Bearings provides these cross-references to support procurement verification. Technical audits should always verify the shaft abutment (da min=29 mm) and housing abutment (Da max=43 mm) dimensions to ensure proper seating and prevent vibration stress.
Typical Industrial Applications
- Electric Motors and Generators
- Centrifugal Pumps and Fluid Handling
- Automotive Gearboxes and Transmissions
- Conveyor Rollers and Material Handling
- Handheld Power Tools and Appliances
Service Life & Reliability
The reliability of the 6005 is grounded in L10 Life Calculation Logic, where the relationship between precision honing and material purity is maximized. By reducing friction torque through optimized ball-to-raceway contact, the bearing maintains its heat treatment stability, preventing dimensional drift. High-speed industrial environments demand that the bearing resists subsurface-initiated fatigue; ZQM achieves this by controlling the ppm level of inclusions, ensuring that the 6005 achieves its full theoretical fatigue life. The 6.55 kN static load rating (C0) provides a robust safety margin against permanent deformation (brinelling) during stationary vibration or impact loads.
Installation & Lubrication Notes
Success in high-speed applications depends on precise misalignment compensation, although deep groove ball bearings have limited tolerance for shaft deflection compared to spherical variants. Exceeding 0.001 radians of misalignment will lead to increased noise and early raceway failure. Relubrication intervals must follow the speed ratings of 20,000 r/min for grease and 32,000 r/min for oil. Incorrect grease selection or over-greasing is a primary cause of thermal seizure in 6005 bearings; ensure the lubricant matches the dimensional stability envelope of the operating environment. Proper mounting using induction heaters or cold mounting tools is essential to prevent raceway damage.
Frequently Asked Questions
How does material purity influence the fatigue resistance of 6005 bearings?
Material purity is the primary determinant of the L10 fatigue life in the 6005. By using vacuum-degassed steel, ZQM minimizes non-metallic inclusions that act as stress concentration points under the contact subsurface. If inclusions are present, the constant Hertzian contact stress will trigger subsurface cracks, leading to premature spalling. High purity ensures that the 6005 maintains its dimensional stability and load-carrying capacity over millions of stress cycles.
What is the difference between CN and C3 clearance for a 6005 bearing?
CN (Normal) clearance is the standard internal gap used for most general applications. C3 clearance provides a larger internal gap, which is necessary when the 6005 operates under high temperatures where the inner ring expands significantly, or when there is a heavy interference fit on the shaft. Choosing C3 prevents thermal seizure by ensuring that internal clearance optimization is maintained even during thermal expansion.
Can a 6005 deep groove ball bearing handle axial loads?
Yes, the 6005 is designed to manage combined radial and axial loads. The deep raceway grooves allow the balls to track securely even under axial pressure. However, the axial load capacity is typically limited to a percentage of the static load rating (C0). For pure axial loads or extremely high axial-to-radial ratios, angular contact bearings might be required, but for most standard motor and pump applications, the 6005 is perfectly sufficient.
Why is the noise level (vibration) so critical for 6005 bearings in motors?
In electric motors, bearing noise is often the first indicator of improper lubrication or raceway damage. Low vibration (Z2/Z3 levels) is essential to prevent resonant frequencies from damaging motor windings or causing audible annoyance in consumer products. ZQM 6005 bearings undergo 100% vibration testing to ensure the raceway honing meets the strict requirements for low friction torque and quiet operation.
What are the critical installation abutment dimensions for the 6005?
For a 6005 installation, the shaft abutment (da min) should be 29 mm, and the housing abutment (Da max) should not exceed 43 mm. If these dimensions are not respected, the bearing’s load path will be compromised, leading to vibration stress or axial drift. The fillet radius (ra max=0.6 mm) must be strictly controlled to ensure the 6005 sits flush against the shoulder, maintaining its precise axial positioning.
Related Bearing Models
- 6004
- 6006
- 6205
- 6305
- 16005
Technical Support & Global Inquiry
ZQM Bearings supports long-term supply programs for international OEMs and distributors, emphasizing batch-to-batch dimensional consistency and controlled manufacturing processes. Our engineering team focuses on standardized quality control across repeated production batches to ensure consistent fit and performance for overseas shipments.
Standardized export packaging and anti-rust surface treatment are provided for all overseas shipments to maintain the dimensional integrity of your order. ZQM engineers provide 24/7 technical selection support to ensure the selected bearing solution matches your specific industrial application needs. Request a customized quote for bulk orders or OEM-specific bearing requirements to support your high-performance projects.
