The 6005 bearing is a widely used deep groove ball bearing with a bore diameter of 25 mm, an outside diameter of 47 mm, and a width of 12 mm. It is one of the most popular models in the 6000 series. Whether you are selecting bearings for electric motors, automotive components, or industrial machinery, understanding the technical specifications, sealing types, and application scenarios of the 6005 bearing is essential. What is the difference between 6005 2Z and 6005 2RS? What does DDU mean? Which sealing type works best for high-speed applications? This guide provides comprehensive answers. The following sections detail each specification category in order.
Technical Specifications of 6005 Bearing
The 6005 bearing is a single-row deep groove ball bearing designed to accommodate radial loads and moderate axial loads in both directions. Below are the key technical specifications.
| Parameter | Value |
|---|---|
| Bore Diameter (d) | 25 mm |
| Outside Diameter (D) | 47 mm |
| Width (B) | 12 mm |
| Weight | approx. 80 g |
| Dynamic Load Rating (Cr) | 7.75 kN (approx. 790 kgf) |
| Static Load Rating (C0r) | 5.15 kN (approx. 525 kgf) |
| Chamfer Dimension (r min.) | 0.6 mm |
| Number of Balls | 10 |
| Ball Diameter | 6.35 mm |
Note: Load ratings are typical values for standard 6005 bearings. Actual values may vary slightly between manufacturers.
Limiting Speeds by Seal Type
The maximum rotational speed of a 6005 bearing depends on its sealing configuration.
| Sealing Type | Limiting Speed (rpm) |
|---|---|
| OPEN | 18,000 rpm |
| 2Z / ZZ (Metal shields both sides) | 15,000 rpm |
| 2RS (Contact rubber seals both sides) | 15,000 rpm |
| DU / DDU (Non-contact rubber seals both sides) | 9,500 rpm |
Open bearings have the highest speed capability. Shielded (2Z) and contact rubber-sealed (2RS) bearings share the same 15,000 rpm limit in this specification. DU/DDU non-contact rubber seals offer a lower speed limit of 9,500 rpm.
Bearing Number and Code Meaning
Understanding the bearing number helps users quickly identify specifications.
6005 Base Number
- 60 : Deep groove ball bearing series (6000 series – extra-light width and diameter).
- 05 : Bore diameter code. For bore ≥20 mm, multiply code by 5 → 05 × 5 = 25 mm.
Suffix Codes
| Suffix | Meaning |
|---|---|
| Z | Metal shield on one side |
| 2Z or ZZ | Metal shields on both sides |
| RS | Rubber seal on one side (contact type) |
| 2RS | Rubber seals on both sides (contact type) |
| DU / DDU | Non-contact rubber seals on both sides |
| 2RSH | High-performance rubber seals on both sides |
| OPEN / No suffix | No seals or shields |
| C3 | Increased internal radial clearance |
| NR | Snap ring groove |
Components of 6005 Bearing
Like all deep groove ball bearings, the 6005 consists of four primary components:
- Inner Ring – Mounted onto the shaft, with a precision-ground raceway.
- Outer Ring – Fits into the housing.
- Balls – Typically 10 steel balls of 6.35 mm diameter, carrying the load.
- Cage (Retainer) – Maintains ball spacing. Materials include stamped steel or polyamide (PA66).
Types of 6005 Bearing
The 6005 bearing is available in multiple configurations.
6005 2Z (ZZ) – Double Metal Shields
Non-contact protection against larger dust particles. Low friction, high speed (15,000 rpm). Suitable for electric motors and general machinery.
6005 2RS – Double Contact Rubber Seals
Contact seals provide excellent protection against dust, moisture, and contaminants. Pre-lubricated and maintenance-free. Speed rating 15,000 rpm per manufacturer specification.
6005 Z – Single Metal Shield
One side shielded, one side open. Allows relubrication while providing moderate protection.
6005 2RSH – Double High-Performance Rubber Seals
Improved seal design for harsh environments. Better grease retention and contamination exclusion. Speed rating consistent with 2RS.
6005 DU / DDU – Double Non-Contact Rubber Seals
Non-contact rubber seals do not touch the inner ring, offering lower friction than contact seals but with a lower speed limit of 9,500 rpm. They provide better contamination protection than metal shields while maintaining higher speed than contact rubber seals. Ideal for precision instruments and small electric motors where moderate sealing is sufficient.
6005 OPEN – Open Bearing
No seals or shields. Highest speed (18,000 rpm) but requires external lubrication and clean environments.
How to Choose the Suitable Sealing Type
| Condition | Recommended Type | Reason |
|---|---|---|
| High speed (>14,000 rpm) | OPEN or 2Z | Lower friction |
| Dusty environment | 2Z | Blocks solid particles |
| Humid or wet environment | 2RS or 2RSH | Contact rubber seals block moisture |
| Moderate dust + speed | DDU | Non-contact rubber seals |
| Outdoor equipment | 2RSH | Superior environmental sealing |
| Low-maintenance application | 2RS / DDU | Pre-lubricated, sealed |
Consider these factors: application environment, speed requirements, maintenance access, operating temperature, load type, lubrication, and cost.
Key Features of 6005 Bearing
- Superior Load Capacity – Deep groove design handles radial and bidirectional axial loads.
- High-Speed Operation – Open version reaches 18,000 rpm with grease lubrication.
- Quality Seal Design – Options from metal shields to contact/non-contact rubber seals suit diverse operating conditions.
Applications of 6005 Bearing
- Automotive – Alternators, water pumps, tensioner pulleys.
- Industrial Equipment – Conveyors, gearboxes, compressors, pumps.
- Electrical & Electronic – Electric motors, generators, fans (2Z preferred).
- Pumps – Water pumps, coolant pumps (sealed versions recommended).
- Conveyors – Roller supports.
- Home Appliances – Washing machines, dryers, refrigerators.
Related 6000 Series Bearings
| Model | Bore (mm) | OD (mm) | Width (mm) |
|---|---|---|---|
| 6000 | 10 | 26 | 8 |
| 6001 | 12 | 28 | 8 |
| 6002 | 15 | 32 | 9 |
| 6003 | 17 | 35 | 10 |
| 6004 | 20 | 42 | 12 |
| 6005 | 25 | 47 | 12 |
| 6006 | 30 | 55 | 13 |
Frequently Asked Questions (FAQs)
Q1: What is the difference between 6005 2Z and 6005 2RS?
A1: 2Z uses non-contact metal shields (lower friction, dust protection only). 2RS uses contact rubber seals (better sealing against moisture, same 15,000 rpm speed rating per specification).
Q2: What is the maximum speed of a 6005 bearing?
A2: Open: 18,000 rpm; 2Z and 2RS: 15,000 rpm; DDU: 9,500 rpm.
Q3: What is the difference between 6005 2RS and 6005 DDU?
A3: 2RS has contact rubber seals (touching inner ring) while DDU has non-contact rubber seals. In this manufacturer’s specification, both have different speed limits: 2RS at 15,000 rpm, DDU at 9,500 rpm. Choose 2RS for higher speed and tighter sealing; choose DDU when non-contact design is preferred.
Q4: Can a 6005 bearing handle axial loads?
A4: Yes, deep groove ball bearings can accommodate axial loads in both directions, though axial capacity is lower than radial capacity.
Q5: What does C3 suffix mean?
A5: Increased internal radial clearance, used for high temperatures, high speeds, or interference fits.
Q6: Are 6005 bearings interchangeable among brands?
A6: Yes, dimensions (25×47×12 mm) are standardized under ISO 15. Load ratings and speed limits may vary.
Conclusion
The 6005 bearing is a versatile deep groove ball bearing with standard dimensions of 25 mm bore, 47 mm outside diameter, and 12 mm width. Available in sealing types including 2Z (metal shields), 2RS (contact rubber seals), DDU (non-contact rubber seals), 2RSH (high-performance seals), and open versions, it serves automotive, industrial, electrical, and household applications. When selecting a 6005 bearing, match the sealing type to your operating environment, speed requirements, and maintenance needs. Understanding the bearing number code and technical specifications ensures reliable performance.
