The 6300 bearing belongs to the widely used deep groove ball bearing family and is one of the most popular bearing series in global mechanical and industrial applications. Thanks to its simple structure, high reliability, and versatility, the 6300 series is commonly found in electric motors, pumps, gearboxes, household appliances, and light industrial equipment.
In this ultimate guide from BYWB Bearing, we will explain everything you need to know about the 6300 bearing, including technical specifications, bearing numbering meaning, size dimensions, applications, selection and installation guidelines, common problems, maintenance tips, and a complete 6300 series size chart .
6300 Bearing Technical Specification
The 6300 bearing is a single-row deep groove ball bearing designed for high-speed operation, low friction, and reliable performance under combined radial and axial loads. Its standardized geometry allows full interchangeability across bearing brands, making it one of the most commonly specified bearings worldwide.
Basic Bearing Data (6300)
| Parameter | Specification |
| Bearing type | Single-row deep groove ball bearing |
| ISO bearing series | 63 series |
| Basic bearing number | 6300 |
| Bore diameter (d) | 10 mm |
| Outer diameter (D) | 35 mm |
| Width (B) | 11 mm |
| Contact angle | 0° |
| Number of rows | 1 |
| Ball material | Chrome steel (GCr15 / AISI 52100) |
| Ring material | Chrome steel, through-hardened |
| Cage material | Pressed steel (standard) |
| Precision grade | ABEC-1 / ISO P0 (standard) |
| Internal clearance | CN (normal), C3 optional |
| Sealing options | Open, ZZ (metal shields), 2RS (rubber seals) |
| Lubrication | Grease (factory pre-lubricated for ZZ / 2RS) |
Load Ratings (Typical Reference Values)
| Load Type | Value |
| Dynamic load rating (C) | ≈ 7.6 kN |
| Static load rating (C₀) | ≈ 3.5 kN |
| Fatigue load limit | ≈ 0.15 kN |
Note: Load ratings may vary slightly depending on manufacturer, cage design, and material specification.
Speed Ratings (Typical)
| Bearing Type | Limiting Speed |
| 6300 Open bearing | ≈ 28,000 RPM |
| 6300ZZ (metal shield) | ≈ 22,000 RPM |
| 6300-2RS (rubber seal) | ≈ 14,000 RPM |
Speed limits depend on lubrication, load, temperature, and operating conditions.
6300 bearing Weight
| Parameter | Value |
| Approximate weight | 0.053 kg (53 g) |
Temperature Range
| Bearing Type | Operating Temperature |
| Standard grease | –30°C to +120°C |
| High-temperature grease (optional) | Up to +180°C |
What Does “6300” Mean in Bearings?
The bearing number 6300 follows the international bearing designation system.
Breakdown of the 6300 Bearing Code
6 → Single-row deep groove ball bearing
3 → Diameter series (heavier cross-section than 6200 series)
00 → Bore code
00 = 10 mm
01 = 12 mm
02 = 15 mm
03 = 17 mm
From 04 onward: bore = code × 5 mm
Common Suffixes
ZZ → Double metal shields
2RS / 2RS1 → Double rubber seals
C3 → Greater internal clearance
P6 / P5 → Higher precision grade
Example:
6300-2RS-C3 = 6300 bearing with rubber seals and increased internal clearance.
6300 Bearing Series Size Chart (Up to 6310)
Below is the complete and commonly used 6300 series size chart, expanded up to 6310, suitable for product pages, catalogs, and technical references.
Metric Dimensions (mm)
| Bearing No. | Bore d (mm) | Outer D (mm) | Width B (mm) |
| 6300 | 10 | 35 | 11 |
| 6301 | 12 | 37 | 12 |
| 6302 | 15 | 42 | 13 |
| 6303 | 17 | 47 | 14 |
| 6304 | 20 | 52 | 15 |
| 6305 | 25 | 62 | 17 |
| 6306 | 30 | 72 | 19 |
| 6307 | 35 | 80 | 21 |
| 6308 | 40 | 90 | 23 |
| 6309 | 45 | 100 | 25 |
| 6310 | 50 | 110 | 27 |
This chart covers most industrial applications requiring the 6300 bearing series.
What Is the 6300 Bearing Used For?
Thanks to its robust design and adaptability, the 6300 bearing series is widely used across many industries.
Common Applications
Electric motors and generators
Pumps and compressors
Gearboxes and reducers
Fans and blowers
Conveyor systems
Agricultural machinery
Household appliances (washing machines, dryers)
Packaging and textile machinery
Light automotive and industrial equipment
The larger sizes (6306–6310) are especially suitable for higher load and heavier-duty applications.
6300 Bearing Selection Guidelines
Selecting the correct 6300 bearing ensures longer service life and reliable performance.
Key Factors to Consider
1. Load Conditions
Choose the bearing size based on radial load requirements
For higher axial loads, consider alternative bearing types
2. Speed Requirements
Open or ZZ bearings allow higher speeds
2RS bearings offer better sealing but lower maximum speed
3. Operating Environment
Dusty or wet conditions → 2RS sealed bearings
Clean, high-speed environments → ZZ or open bearings
Corrosive environments → Stainless steel bearings
4. Internal Clearance
Normal clearance (CN): Standard applications
C3 clearance: High-speed or high-temperature applications
5. Shaft & Housing Fit
Proper interference or clearance fit prevents slippage and vibration
6300 Bearing Installation Guidelines
Correct installation is critical for bearing performance and lifespan.
Best Installation Practices
Clean shaft, housing, and bearing before installation
Apply mounting force only on the ring being fitted
Never transmit force through rolling elements
Use bearing heaters or induction heaters for tight fits
Ensure correct shaft alignment
Avoid hammering directly on the bearing
Apply proper lubrication after mounting
Incorrect installation is one of the most common causes of premature bearing failure.
Common Issues and Maintenance of 6300 Bearings
Common Problems
Contamination: Dirt or moisture ingress
Poor lubrication: Over-greasing or under-greasing
Misalignment: Causes uneven load distribution
Overloading: Exceeding bearing load limits
Corrosion: Exposure to water or chemicals
Maintenance Tips
Use correct lubricant type and quantity
Monitor temperature, vibration, and noise
Replace bearings showing abnormal wear
Store bearings in clean, dry environments
Avoid removing seals unnecessarily
Routine maintenance can extend bearing life significantly and reduce downtime.
Advantages of the 6300 Bearing Series
Simple and reliable design
High speed capability
Supports radial and axial loads
Widely available and cost-effective
Easy interchangeability between brands
Suitable for both industrial and general machinery
Conclusion
The 6300 bearing series is a cornerstone of modern mechanical systems. From small electric motors to heavy industrial equipment, these deep groove ball bearings deliver excellent performance, durability, and versatility.
By understanding:
What the 6300 bearing number means
Its technical specifications and size dimensions
Proper selection and installation methods
Common issues and maintenance practices
you can maximize bearing performance and reduce operating costs.
BYWB Bearing supplies a full range of 6300 series bearings, including open, ZZ, and 2RS versions, with stable quality and competitive pricing. Whether you need standard sizes or customized solutions, BYWB Bearing is ready to support your application needs.
Short FAQ
Q: What’s the difference between 6300ZZ and 6300-2RS?
A: 6300ZZ has metal shields (low friction, some contamination protection); 6300-2RS has rubber seals for better sealing against moisture and dirt but slightly higher friction and lower max speed.
Q: Can I re-lubricate a sealed 6300-2RS bearing?
A: Usually sealed bearings are pre-lubricated and not designed for re-lubrication. For frequent re-lubrication requirements, use an open bearing with a grease fitting or a bearing designed for relubrication.
Q: How do I know if my 6300 bearing is failing?
A: Common signs: rising operating temperature, increased vibration/noise, visible grease contamination, or metal particles in lubricant. Perform vibration analysis and visual checks.
