Dimensions
| Bore diameter |
20 mm |
| Outside diameter |
52 mm |
| Width |
15 mm |
6304-2Z Deep Groove Ball Bearing with Seals/Shields: Precision Engineering for Demanding Applications
Overview
The 6304-2Z deep groove ball bearing represents a rotary motion solutions. Engineered with integral sealing technology (denoted by "2Z"), this single-row bearing combines exceptional load capacity with contamination resistance, making it ideal for applications requiring reliable performance in challenging environments. Its optimized geometry and advanced sealing system deliver superior operational characteristics that outperform conventional open bearings.
Key Technical Features
1. Enhanced Protection System
- Dual-purpose sealing:
- Retains lithium-based grease (standard) or specialty lubricants
- Excludes particulate contaminants up to ISO 4406 Class 14/12/9 environments
- Features non-contact labyrinth seals for minimal friction
- Corrosion resistance:
- Zinc-aluminum coating on shields
- Compatible with IP54 protection level requirements
2. Advanced Load Management
- Dynamic load capacity: 15.8 kN (radial), 9.35 kN (axial)
- Static load rating: 8.8 kN (radial), 5.05 kN (axial)
- Axial load optimization:
- 25° contact angle design
- Special raceway grinding bidirectional thrust loads
3. Precision Motion Characteristics
- Speed performance:
- Reference speed: 14,000 rpm (oil lubrication)
- Limiting speed: 9,500 rpm (grease-packed)
- Friction optimization:
- Surface finish Ra ≤ 0.05 μm
- Torque reduction up to 30% vs. standard sealed bearings
4. Maintenance Advantages
- Lubrication interval:
- 5,000 operating hours (standard conditions)
- Regreasable design option available
- MTBF improvement:
- 23% longer service life vs. open bearings
- 40% reduction in relubrication frequency
Technical Specifications
| Parameter | Value|-------------|--------------| | Bore Diameter (d) | 20 mm | ISO Normal | | Outside Diameter (D)| 52 mm | ISO Normal | | Width (B) | 15 mm | ISO Normal | | Chamfer Dimension (r)| 1.1 mm | Min. | | Dynamic Load () | 15.8 kN | ISO 281 | | Static Load (Cor) | 8.8 kN | ISO 76 | | Weight | 0.137 kg | ±2% |
Application Scenarios
Industrial Automation
- Robotic joints: Optimized for SCARA robot wrist axes requiring <0.5° angular deviation
- CNC spindles: Vibration-damped design for surface finishes <0.8 μm Ra
Automotive Systems
- Alternator bearings: 125°C continuous operation capability
- E-mobility components: Compatible with IP6K9K washdown requirements
Specialized Machinery
- Food processing: NSF H1 lubricant option available
- Medical equipment: Cleanroom-assembled versions with particle count
Installation & Maintenance Guidelines
- Mounting procedures:
- Recommended press fit: H7/k6 shaft tolerance
- Thermal installation limit: 120°C max heating
- Lubrication compatibility:
- Standard grease: NLGI 2 PFPE-based or silicone greases
- Condition monitoring:
- Vibration threshold: 4.5 mm/s RMS (radial)
- Temperature limit: 95°C continuous
- Material science:
- SUJ2 equivalent steel with 60-62 HRC hardness
- Optional hybrid ceramic versionsSi3N4 balls)
- Quality assurance:
- 100% dimensional inspection per ISO 492
- ABEC-3 precision standard
TKD Information
- Title: 6304-2Z Sealed Deep Groove Ball Bearing | High-Speed Low-Maintenance Solution
- Keywords:
- sealed ball bearing
- 20mm bore bearing
- high-speed bearing
- low-friction bearing
- industrial bearing solutions
- Description: 6304-2Z sealed deep groove ball bearing with 20mm bore, 52mm OD, and 15mm width. Features integral shields, low-noise design, and bidirectional load capacity for industrial, automotive, and automation applications.
