DKFL 6308 ZZ C3 Z3V3 P6 Deep Groove Ball Bearing
The specialized DKFL 6308 ZZ C3 Z3V3 P6 is a high-precision product. With non-contact metal shields (ZZ), increased internal clearance for high speeds/temperatures (C3), tighter dimensional tolerances (P6), and strict noise/vibration testing (Z3V3), this bearing is ideal for precision rotating equipment.
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Product Detail
Deep Groove Ball Bearing DKFL 6308 ZZ C3 Z3V3 P6 High-speed, ultra-quiet bearing with Z3V3 vibration standard, P6 precision, and dual metal shields
The optimal choice for industrial electric motors, pumps, and equipment sensitive to vibration, heat, and tight tolerances.
Introduction to the DKFL 6308 ZZ C3 Z3V3 P6
The 6308 model is one of the most widely used and robust bearings in the Medium Series of deep groove ball bearings. Due to its optimized geometry and raceway depth, it offers high load-carrying capacity for both radial and axial loads in both directions.
The specialized DKFL 6308 ZZ C3 Z3V3 P6 is a high-precision product. With non-contact metal shields (ZZ), increased internal clearance for high speeds/temperatures (C3), tighter dimensional tolerances (P6), and strict noise/vibration testing (Z3V3), this bearing is ideal for precision rotating equipment.
Pre-packed with high-quality, stable grease, this bearing ensures exceptionally smooth, quiet, vibration-free, and durable performance in continuous operation.
Technical Code Breakdown
6308: The 6 designates a single-row deep groove ball bearing; the 3 designates the Medium Series (high load); the 08 indicates a 40mm bore diameter (08 × 5).
ZZ (2Z): Metal shields on both sides. These provide protection against large particles and grease retention without contact friction, allowing for maximum rotational speed (RPM).
C3: Greater than normal internal radial clearance. This prevents locking or overheating caused by thermal expansion of the shaft in high-speed applications.
Z3V3: The highest tier in Electric Motor Quality (EMQ) noise and vibration standards. Z3 and V3 represent minimum acceleration/velocity vibration limits, guaranteeing ultra-quiet performance.
P6 (ISO Class 6): Dimensional and geometric precision class higher than standard (P0). Ensures tighter tolerances for bore, outer diameter, and run-out.
Dimensions & Specifications
| Bore (d) | Outer Dia (D) | Width (B) | Shield Type | Tolerance Class | Noise/Vib Grade |
|---|---|---|---|---|---|
| 40 mm | 90 mm | 23 mm | Dual Metal (ZZ) | P6 / ABEC-3 | Z3V3 (EMQ) |
Features & Benefits
Ultra-Quiet Operation (Z3V3)
Precisely controlled raceway profiles and ball surface finishes minimize equipment vibration and noise.
P6 Precision Class
Tight dimensional tolerances and minimal run-out prevent asymmetrical wear and improve system efficiency.
High Speed & Heat (C3)
C3 clearance compensates for thermal expansion of the shaft in high-speed applications without restricting performance.
Non-Contact Metal Shields (ZZ)
Metal shields offer grease retention without frictional drag, operating cooler than contact-type seals.
100Cr6 Chrome Alloy Steel
DKFL industrial-standard heat treatment provides exceptional fatigue resistance under heavy loads.
Long-life Lubrication
Factory-packed with high-grade, stable soap-based grease for maintenance-free reliability.
Common Applications
Designed for environments sensitive to noise, heat, and vibration:
- Industrial Motors & Generators: Especially high-speed drives sensitive to bearing noise.
- Centrifugal Pumps: Shafts subject to continuous operating heat and direct radial stress.
- Compressors & Industrial Blowers: High-speed operation requiring low housing vibration.
- Precision Gearboxes: Torque transmission combined with tight geometric stability.
- Textile Machinery & Instrumentation: Equipment where precision movement is critical.
Buying Guide
- C3 Clearance: If installing on a hot shaft or using a tight interference fit, always select C3 to prevent locking.
- ZZ vs 2RS: ZZ metal shields are non-contact and better for high speeds and temperature; choose 2RS rubber seals only if water or heavy dirt ingress is the primary concern.
- Importance of Z3V3: For sensitive motors, avoid models without this vibration standard to prevent premature resonance and failure.
- DKFL Authenticity: Check packaging quality, shield integrity, and the clarity of engravings on the bearing rings.
Installation Tips
1) Inductive/Press Fit
To preserve P6 accuracy, mount using induction heating or a press, applying force only to the interference-fit ring (inner ring for shaft).
2) Never Strike Directly
Direct hammer strikes cause indentation (Brinelling) on the raceways, instantly destroying the Z3V3 low-noise property.
3) Shield Integrity
Be careful not to deform the metal shields during transport; distortion causes friction with the inner cage and generates heat.
4) Alignment
Maintain precise alignment; misalignment exceeds the capacity of deep groove bearings and reduces lifespan.
Maintenance & Monitoring
- Vibration Analysis: Use periodic spectrum analysis to detect early signs of metal fatigue.
- 3) Shield Integrity
Be careful not to deform the metal shields during transport; distortion causes friction with the inner cage and generates heat.
4) Alignment
Maintain precise alignment; misalignment exceeds the capacity of deep groove bearings and reduces lifespan.
Maintenance & Monitoring
- Vibration Analysis: Use periodic spectrum analysis to detect early signs of metal fatigue.
- Thermal Monitoring: Initial temp spikes are normal as grease distributes; ensure temperature stabilizes within acceptable limits.
- Noise Check: Use acoustic tools to listen for dryness or abnormal vibrations.
3) Do ZZ shields require periodic greasing?
No. It comes factory-packed, and the metal shields are effective enough to seal the lubricant, requiring no maintenance.
4) What is the advantage of P6 over standard P0?
P6 offers stricter tolerance limits and higher rotational accuracy, significantly reducing system mechanical vibration.
Conclusion
The DKFL 6308 ZZ C3 Z3V3 P6 is a technical package combining speed, durability, precision, and quietness. Whether for premium electric motors or high-speed rotating equipment, this product guarantees top-tier reliability.
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