The 6003 bearing is a single-row deep groove ball bearing with a bore diameter of 17 mm, an outside diameter of 35 mm, and a width of 10 mm. Weighing approximately 39 grams, this bearing is commonly used in electric motors, automotive components, household appliances, and industrial machinery. This guide provides complete technical specifications, seal type comparisons, load ratings, speed limits, suffix code meanings, and application examples for the 6003 bearing.
6003 Bearing Dimensions and Basic Specifications
The 6003 bearing conforms to ISO 15 standard dimensions, ensuring interchangeability across manufacturers. The table below summarizes the key dimensional and performance parameters:
| Parameter | Value |
|---|---|
| Bore Diameter (d) | 17 mm |
| Outside Diameter (D) | 35 mm |
| Width (B) | 10 mm |
| Weight | approx. 39 g |
| Dynamic Load Rating (Cr) | 6.0 kN (approx. 612 kgf) |
| Static Load Rating (Cor) | 3.25 kN (approx. 331 kgf) |
The bearing has a minimum chamfer dimension (rmin) of 0.3 mm. The recommended shaft abutment diameter (da min) is 19 mm, and the housing abutment diameter (Da max) is 33 mm. The fillet radius (ra max) should not exceed 0.3 mm to avoid interference during installation.
The dynamic load rating (6.0 kN) represents the maximum radial load the bearing can sustain while rotating under standard conditions. Exceeding this rating causes accelerated wear and premature failure. The static load rating (3.25 kN) is the maximum load when the bearing is stationary, with a recommended safety margin of 80% for extended service life.
Speed ratings by seal type and lubrication method
The limiting speed of a 6003 bearing depends significantly on the seal type and lubrication method. The table below shows maximum recommended speeds for different configurations:
| Configuration | Grease Lubrication | Oil Lubrication |
|---|---|---|
| Open Type | up to 24,000 rpm | up to 26,000 rpm |
| ZZ (Metal shields) | up to 21,000 rpm | up to 26,000 rpm |
| 2RZ (Non-contact rubber) | 18,000–22,000 rpm | up to 24,000 rpm |
| 2RS / DDU (Rubber seals) | 13,000–21,000 rpm | Not recommended |
Open type bearings achieve the highest speeds due to the absence of sealing friction. ZZ metal shields are non-contact and allow speeds nearly as high as open types, especially with oil lubrication. 2RZ non-contact rubber shields offer a balance between protection and speed. Contact rubber seals (2RS/DDU) have the lowest speed limits due to lip friction and are not recommended for oil lubrication, as the rubber material may swell or degrade. For continuous high-speed operation above 21,000 rpm, open or ZZ types with oil lubrication are recommended.
Material and Components of 6003 Bearing
The 6003 bearing consists of four primary components: the inner ring, the outer ring, rolling elements (balls), and a cage or retainer. Deep groove ball bearings like the 6003 feature raceway grooves slightly larger than the radius of the steel balls, enabling them to accommodate both radial loads and axial loads in either direction.
Material specifications:
- Rings and balls: SAE 52100 chrome steel (also known as 100Cr6), a high-carbon chromium-bearing steel containing approximately 1% carbon and 1.35–1.6% chromium. This material achieves a surface hardness of 60–64 HRC through controlled heat treatment, providing excellent wear resistance and fatigue life.
- Cage: Typically pressed steel sheet metal (JN designation) or, in some variants, nylon or brass depending on operating conditions.
For specialized applications requiring corrosion resistance or operation in extreme temperatures, stainless steel variants (S6003) and full ceramic hybrid bearings are also available.
As a bearing manufacturer with experience in producing 6000 series bearings, DUHUI Bearing follows ISO 9001 manufacturing standards for dimensional accuracy and material consistency.
6003 Bearing Suffix Code Meaning
The 6003 bearing designation follows a standardized naming convention. The base number “6003” indicates a deep groove ball bearing in the 6000 series (extra light series) with a 17 mm bore diameter.
Common suffixes and their meanings:
| Suffix | Meaning |
|---|---|
| ZZ / 2Z | Metal shields (non-contact) on both sides |
| 2RS / 2RSR / LLU / DDU | Contact rubber seals on both sides |
| RS / RSR | Rubber seal on one side |
| Z | Metal shield on one side |
| OPEN | No seal or shield (open type) |
| C3 | Internal clearance larger than normal (Group 3) |
| CN | Normal internal clearance (Group N) |
| P0 / PN | Normal tolerance class (ISO class 0 / DIN P0) |
For example, a 6003-2RS bearing has rubber seals on both sides. A 6003-ZZ bearing has metal shields on both sides. A 6003-2Z/C3 bearing has metal shields on both sides with increased internal clearance (C3).
The internal clearance (C3 vs. CN) affects how the bearing handles thermal expansion and press-fit mounting. C3 clearance is recommended for applications with operating temperatures above 70°C or where the bearing is press-fitted onto a steel shaft.
Sealing Types and Selection of 6003 Bearing
6000 series bearings are available in four sealing configurations, each suited for different operating environments. The speed capabilities and lubrication compatibility of each type are summarized below.
Open Type (6003 OPEN)
The open configuration has no seals or shields. It offers the highest speed capability (up to 24,000 rpm with grease, 26,000 rpm with oil) but requires external sealing and regular lubrication. Suitable for applications with clean operating environments and routine maintenance schedules.
ZZ Type / 2Z (6003 ZZ, 6003-2Z)
Metal shields on both sides provide non-contact protection against large debris while allowing lubricants to reach the rolling elements. This type offers moderate protection with minimal friction increase. Speed limits are up to 21,000 rpm with grease and up to 26,000 rpm with oil. Suitable for general industrial applications where airborne dust is present.
2RZ Type
Non-contact rubber shields offer a balance between protection and low friction, with less drag than contact seals while providing better sealing than metal shields. Grease-lubricated speeds range from 18,000 to 22,000 rpm; oil lubrication can reach up to 24,000 rpm. This type is ideal for applications requiring better sealing than ZZ but with speed higher than 2RS.
2RS / DDU Type (6003 2RS, 6003 DDU)
Contact rubber seals provide superior protection against dust, moisture, and contaminants. The rubber lip contacts the inner ring, creating an effective barrier. DDU is a common designation used by NSK for the same seal construction. Speed limits are 13,000–21,000 rpm with grease lubrication. Oil lubrication is not recommended as the rubber may swell or degrade. This type is ideal for harsh environments such as agricultural equipment, outdoor machinery, and applications with limited maintenance access.
Selection factors:
- Application environment: For clean, indoor environments, open or ZZ types are adequate. For dusty, wet, or outdoor conditions, 2RS or DDU seals are recommended.
- Speed requirements: Contact seals (2RS/DDU) reduce maximum allowable speed compared to open, ZZ, or 2RZ types. Refer to the speed rating table in the first section for exact limits.
- Maintenance access: Open bearings require regular relubrication. Sealed bearings (ZZ, 2RS, 2RZ) are typically grease-filled and sealed for life, requiring no maintenance.
Key Features of the 6003 Bearing
The 6003 bearing offers several engineering advantages that contribute to its widespread adoption:
- Superior Load Capacity: The deep groove raceway design allows the 6003 bearing to support radial loads, axial loads, or combined loads in both directions, providing versatility across various machinery types.
- High-Speed Operation: Precision-engineered raceways and high-grade balls minimize internal friction, enabling rotational speeds up to 24,000 rpm in open configurations with grease lubrication. Low frictional torque makes this bearing suitable for high-speed spindles and electric motors.
- Quality Seal Design: Multiple sealing options (open, shielded, or sealed) allow the 6003 bearing to be configured for specific environmental conditions, extending service life by preventing contamination ingress.
- Durability: SAE 52100 chrome steel construction with through-hardening heat treatment provides high hardness (60–64 HRC) and excellent resistance to rolling contact fatigue, ensuring reliable operation under sustained loads.
- Precision Engineering: Manufactured to ABEC 1 (ISO P0) tolerance class as standard, with higher precision grades available for demanding applications. The 6003 bearing is available in vibration grades V2, V3, and V4, as well as noise grades Z2, Z3, and Z4 for quiet operation requirements.
- Low Friction: The point contact between balls and raceways, combined with optimized internal geometry, results in low frictional torque, reduced energy consumption, and lower operating temperatures.
Common Applications of 6003 Bearing
The 6003 bearing’s combination of compact dimensions (17 mm × 35 mm × 10 mm), moderate load capacity (6.0 kN dynamic), and high-speed capability makes it suitable for a broad range of applications across multiple industries:
- Automotive: Electric motors, gearboxes, pumps, alternators, and automotive ancillary equipment. The 6003 bearing is commonly found in small to medium-sized automotive components requiring reliable radial and axial load support.
- Electric Motors: Small to medium-sized electric motors, generators, fans, and blowers. The low frictional torque and high-speed capability of the 6003 bearing make it ideal for motor applications requiring efficient, quiet operation.
- Agricultural Machinery: Tractors, string trimmers, gardening equipment, and agricultural implements. Sealed variants (6003 2RS or 6003 DDU) are preferred for agricultural applications due to exposure to dust, dirt, and moisture.
- Household Appliances: Washing machines, dryers, vacuum cleaners, and power tools. The compact dimensions and quiet operation of the 6003 bearing make it suitable for consumer appliances where space and noise are considerations.
- Industrial Machinery: Conveyors, pumps, compressors, gearboxes, textile machinery, and printing machinery. The versatility of the 6003 bearing allows it to be used across diverse industrial equipment.
- Aerospace and UAVs: Aircraft components, satellite systems, and commercial drones. For aerospace applications, high-precision and full ceramic variants of the 6003 bearing are used where weight reduction and corrosion resistance are critical.
- Wind Energy Sector: Small wind turbines and pitch control systems in larger turbines. The 6003 bearing is employed in various sub-systems of wind energy installations where reliable operation under variable loads is required.
Related 6000 Series Bearings
The 6003 bearing belongs to the 6000 series of extra light deep groove ball bearings. Other common models in this series include:
| Model | Dimensions (mm) | Dynamic Load (kN) | Typical Applications |
|---|---|---|---|
| 6000 | 10 × 26 × 8 | 4.55 | Small fans, instruments |
| 6001 | 12 × 28 × 8 | 5.00 | Power tools, small motors |
| 6002 | 15 × 32 × 9 | 5.50 | Alternators, pumps |
| 6003 | 17 × 35 × 10 | 6.00 | Electric motors, appliances |
| 6004 | 20 × 42 × 12 | 9.38 | Larger industrial equipment |
When selecting between these models, consider shaft diameter requirements and available housing space. The 6004 offers higher load capacity but requires a 20 mm shaft and larger housing dimensions.
Conclusion
The 6003 bearing is a standard metric deep groove ball bearing with 17 mm bore diameter, 35 mm outside diameter, and 10 mm width. It has a dynamic load rating of 6.0 kN and a static load rating of 3.25 kN. Available in open, shielded (ZZ), non-contact rubber (2RZ), and sealed (2RS/DDU) configurations, it serves applications across automotive, electric motor, agricultural, industrial, and consumer sectors. Speed capability ranges from 13,000 rpm for rubber-sealed versions up to 24,000 rpm for open types with grease lubrication. For reliable operation, select the appropriate seal type based on environmental conditions and speed requirements.
Key takeaways:
- Dimensions: 17 mm bore × 35 mm OD × 10 mm width
- Load ratings: Cr = 6.0 kN, Cor = 3.25 kN
- Speed range: 13,000–24,000 rpm depending on seal type
- Sealing options: Open, ZZ (shields), 2RZ (non-contact rubber), 2RS/DDU (rubber seals)
- Common suffixes: C3 (increased clearance), ZZ (metal shields), 2RS (rubber seals)
Frequently Asked Questions
Q1: What is the difference between 6003 ZZ and 6003 2RS?
A1: 6003 ZZ uses metal shields on both sides (non-contact, lower friction, moderate protection). 6003 2RS uses contact rubber seals (higher friction, superior protection against dust and moisture). ZZ types allow slightly higher speeds (up to 21,000 rpm), while 2RS types provide better contamination protection and are recommended for dusty or wet environments.
Q2: What is the load capacity of a 6003 bearing?
A2: The dynamic load rating (Cr) is 6.0 kN (approximately 612 kgf), and the static load rating (Cor) is 3.25 kN (approximately 331 kgf). The dynamic rating applies to rotating conditions; the static rating applies to stationary conditions.
Q3: Can a 6003 bearing handle axial load?
A3: Yes. As a deep groove ball bearing, the 6003 can accommodate axial (thrust) loads in both directions in addition to radial loads, making it versatile for applications with combined loading conditions.
Q4: What is the C3 clearance in 6003 bearings?
A4: C3 indicates internal clearance larger than normal (Group 3). C3 clearance is recommended for applications with press-fit mounting, elevated operating temperatures (above 70°C), or high rotational speeds where thermal expansion may reduce internal clearance.
Q5: What is the temperature range for 6003 bearings?
A5: Standard 6003 bearings with steel rings and standard grease operate from approximately -20°C to +120°C. For high-temperature applications (up to 350°C), special heat-stabilized variants are available from major manufacturers.
Q6: Are 6003 bearings interchangeable across brands?
A6: Yes. The 6003 bearing dimensions (17 × 35 × 10 mm) and performance characteristics conform to ISO 15 standards, ensuring mechanical interchangeability across major brands including SKF, NSK, FAG, NTN, Koyo, and other manufacturers.
Q7: What is the weight of a 6003 bearing?
A7: A standard 6003 bearing weighs approximately 39 grams (0.039 kg). Weight may vary slightly depending on the cage material and seal type, but the difference is typically within ±1 gram.
