What are the exact dimensions of a 6000 bearing? Which seal type is best for your application—ZZ, 2RS, or open? This guide provides comprehensive technical information about the 6000 deep groove ball bearing, including dimensions, specifications, code meanings, materials, and common applications.
6000 Bearing Dimensions and Specifications
The 6000 bearing is a single-row deep groove ball bearing with the following standard dimensions, conforming to ISO and JIS standards:
| Parameter | Metric | Inch |
|---|---|---|
| Inner diameter (d) | 10 mm | 0.3937 in |
| Outer diameter (D) | 26 mm | 1.0236 in |
| Width (B) | 8 mm | 0.315 in |
| Chamfer (r min) | 0.3 mm | 0.012 in |
Additional technical specifications:
| Parameter | Value |
|---|---|
| Basic dynamic load rating (C) | 5.05 kN (approx. 515 kgf) |
| Basic static load rating (C0) | 1.96 kN (approx. 200 kgf) |
| Limiting speed (grease lubrication) | 29,000 rpm |
| Limiting speed (oil lubrication) | 34,000 rpm |
| Weight | 19 g |
| Ball complement | 7 balls |
| Ball size | 4.7625 mm |
The basic dynamic load rating (C) indicates the load under which 90% of a group of identical bearings can achieve a rated life of 1 million revolutions. The basic static load rating (C0) represents the load at which permanent deformation begins to occur in stationary or slow-rotating conditions.
6000 Bearing Code Meaning
Understanding the bearing code helps in selecting the correct replacement. The designation “6000” breaks down as follows:
| Code Component | Meaning |
|---|---|
| 6 | Single-row deep groove ball bearing |
| 0 | Extra light series (the smallest cross-section in the 60 series) |
| 00 | 10 mm bore diameter |
The rule for 60 and 62 series bearings: multiply the last two digits by 5 to get the bore diameter in mm. For example, 6000 → 00 × 5 = 0? This is the exception—00 indicates 10 mm. Similarly, 6201 → 01 × 5 = 5 mm, but standard is 12 mm. The 6000 bearing has a fixed 10 mm bore.
Common suffix codes for 6000 bearings:
| Suffix | Description | Best for |
|---|---|---|
| None (open) | No seals or shields | Clean environments, high-speed applications requiring external lubrication |
| Z | Metal shield on one side | One-sided protection with minimal friction increase |
| ZZ | Metal shields on both sides | Relatively clean environments with moderate speed requirements |
| RS | Rubber seal on one side | One-sided protection with superior contaminant exclusion |
| 2RS | Rubber seals on both sides | Harsh environments with dust, moisture, or contaminants |
Shielded bearings (ZZ) offer lower friction and higher speed capability than sealed bearings, but provide less protection against fine particles and moisture. Sealed bearings (2RS) provide superior protection but generate slightly higher friction, which may limit maximum operating speeds. The C3 suffix indicates increased internal clearance for applications with thermal expansion or higher operating temperatures.
Composition and Structural Design
A 6000 deep groove ball bearing consists of four main components:
- Inner ring: Mounts directly onto the shaft (10 mm bore)
- Outer ring: Fits into the housing (26 mm outer diameter)
- Rolling elements: Seven steel balls (4.7625 mm diameter)
- Cage: Retains and spaces the balls evenly
The deep groove geometry—with arc-shaped raceways on both inner and outer rings—enables the bearing to accommodate radial loads, axial loads in both directions, and combined loads. This design also allows for relatively high-speed operation with low friction.
Material and Performance Characteristics
Material
The rings and balls of standard 6000 bearings are manufactured from GCr15 bearing steel, equivalent to AISI 52100 or DIN 100Cr6. This high-carbon chromium steel delivers:
- Hardness of HRC 60–65 after proper heat treatment
- High fatigue strength and wear resistance
- Good dimensional stability
Key Performance Features
- Low friction: The deep groove design minimizes rolling resistance, reducing energy consumption and heat generation
- Quiet operation: Precision manufacturing ensures low noise and vibration levels, suitable for noise-sensitive applications
- Dual load capacity: Supports radial loads as well as moderate axial loads in both directions
- High-speed capability: With appropriate lubrication, the 6000 bearing can achieve speeds up to 34,000 rpm (oil lubrication) or 29,000 rpm (grease lubrication)
Common Applications
The 6000 deep groove ball bearing is widely used across multiple industries due to its compact dimensions and reliable performance:
- Automotive: Alternators, water pumps, idler pulleys, transmission components, and electric power steering units
- Electric Motors: Small and medium-sized electric motors, cooling fans, and servo motors
- Household Appliances: Washing machines, vacuum cleaners, fans, blenders, and air conditioner fan motors
- Industrial Machinery: Conveyor systems, pumps, compressors, power tools, and gearboxes
- Agricultural Equipment: Small agricultural machinery components
- Skateboards and Bicycles: Wheel bearings and drivetrain components
Cross Reference with Major Brands
The 6000 bearing dimensions follow international standards, making it interchangeable across major bearing manufacturers. Cross-reference equivalents:
| Manufacturer | Equivalent Model |
|---|---|
| SKF | 6000 |
| NSK | 6000 |
| FAG | 6000 |
| NTN | 6000 |
| KOYO | 6000 |
| NACHI | 6000 |
| Timken | 6000 |
| SNR | 6000 |
| MRC | 100KS |
When sourcing replacement bearings, verify the seal/shield type (ZZ, 2RS, or open) and any additional suffixes such as C3 (increased clearance).
Conclusion
The 6000 deep groove ball bearing—with its 10 mm bore, 26 mm outer diameter, and 8 mm width—is a versatile, standardized component used across automotive, industrial, and household applications. Key specifications to remember include a dynamic load rating of 5.05 kN, limiting speeds up to 34,000 rpm, and weight of 19 grams. Selection among open, ZZ, and 2RS configurations should be based on operating environment and speed requirements. The 6000 bearing is interchangeable across all major global brands.
FAQs
Q1: What is the difference between 6000, 6200, and 6300 series bearings?
A1: The three series share the same bore diameter coding system but differ in cross-sectional thickness and load capacity. The 6200 series has a larger cross-section than 6000, and the 6300 series is larger than both. As a result, load capacity increases from 6000 to 6300, but the larger bearings also occupy more radial space.
Q2: Can I use a 6000-2RS bearing instead of a 6000-ZZ?
A2: Yes, dimensionally they are identical. However, 2RS (rubber-sealed) bearings have higher friction and lower maximum speed than ZZ (metal-shielded) bearings, but offer superior protection against contaminants and moisture. Select based on your operating environment.
Q3: What does C3 clearance mean for 6000 bearings?
A3: C3 indicates greater internal radial clearance than standard (CN). This allows for thermal expansion at higher operating temperatures and compensates for slight misalignment. Use C3 bearings when operating temperatures exceed approximately 70°C or when press fits may reduce internal clearance.
Q4: How do I properly install a 6000 deep groove ball bearing?
A4: Apply force only to the ring being mounted—press on the inner ring when mounting onto a shaft, and on the outer ring when mounting into a housing. Never apply force through the balls. Use proper mounting tools and ensure the shaft and housing are clean and within specified tolerances.
Q5: What is the maximum operating temperature for 6000 bearings?
A5: Standard steel 6000 bearings with standard grease operate reliably up to approximately 100°C to 120°C. For higher temperature applications, specify high-temperature grease or special heat-stabilized materials. The SKF 6000 variant with standard grease has a maximum temperature of 100°C (212°F).
Q6: How to choose between open, shielded, and sealed 6000 bearings?
A6: Open bearings suit clean, well-lubricated environments with regular maintenance access. Shielded (ZZ) bearings balance protection and speed for moderately clean environments. Sealed (2RS) bearings provide maximum protection for harsh, dirty, or moist conditions but sacrifice some speed capability.
Q7: What is the expected lifespan of a 6000 bearing?
A7: Service life varies significantly based on operating conditions, load, speed, lubrication, and contamination levels. Use the basic dynamic load rating (C = 5.05 kN) and the actual applied load in the standard bearing life equation (L10 = (C/P)^3 × 10^6 revolutions) for a theoretical rating life calculation.
Q8: What lubrication should be used for 6000 bearings?
A8: Most sealed and shielded 6000 bearings come pre-lubricated with grease. For open bearings, use lithium-based grease (NLGI grade 2) for general-purpose applications, or oil lubrication for extremely high-speed operation. Regreasing intervals depend on operating conditions—consult your lubrication supplier for specific recommendations.
