DKFL 629 2RS C3 FG Z3V3P6 Miniature Deep Groove Ball Bearing
The DKFL 629 2RS C3 FG Z3V3P6 Miniature Deep Groove Ball Bearing is one of the most advanced and highly sought-after small-scale bearings, engineered for extreme sensitivity, high rotational speeds, and silent operation. Designed for 9mm shafts, this bearing combines elite industrial standards, including the Z3V3 Noise/Vibration grade, P6 precision class, and a reinforced polymer FG cage.
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Product Detail
Miniature Deep Groove Ball Bearing DKFL 629 2RS C3 FG Z3V3P6 Ultra-Quiet & Vibration-Free (Z3V3) | High Precision P6 | C3 Thermal Clearance | FG Polymer Cage
The ultimate standard for 9mm shafts in high-speed power tools (armatures), spindles, medical equipment, and precision miniature motors.
Introduction to DKFL 629 2RS C3 FG Z3V3P6
The DKFL 629 2RS C3 FG Z3V3P6 Miniature Deep Groove Ball Bearing is one of the most advanced and highly sought-after small-scale bearings, engineered for extreme sensitivity, high rotational speeds, and silent operation. Designed for 9mm shafts, this bearing combines elite industrial standards, including the Z3V3 Noise/Vibration grade, P6 precision class, and a reinforced polymer FG cage.
Featuring an FG (Fiberglass Reinforced Polyamide) cage, it minimizes mass and internal friction at speeds exceeding 20,000 RPM, preventing overheating. Furthermore, the Z3V3 certification guarantees that the unit has passed rigorous vibration and noise frequency tests—a critical requirement for electric armatures where vibration can lead to brush failure and electrical faults.
Protected by high-quality 2RS rubber seals and pre-filled with high-speed heat-resistant grease, this genuine DKFL product is maintenance-free and built for maximum operational efficiency.
Technical Code Breakdown (629 2RS C3 FG Z3V3P6)
6: International prefix for single-row deep groove ball bearings.
2: Light series; providing an ideal balance between load capacity and high-speed capability.
9: Nominal bore diameter is exactly 9mm.
2RS: Equipped with two contact rubber seals reinforced with steel rings for 100% protection against dust, carbon brush debris, and chips.
C3: Greater than normal internal radial clearance; designed to compensate for press-fit shrinkage and thermal expansion at high RPM.
FG: Fiber-reinforced Polyamide cage (Polymer); offers exceptionally low friction and wear resistance in critical high-speed applications.
Z3: Stringent acceleration vibration level; indicates the highest grade of acoustic quality.
V3: Low velocity vibration level; ensures smooth body operation and minimal machine shaking.
P6: ISO Class 6 accuracy tolerance (equivalent to ABEC-3) ensuring minimal run-out.
Dimensions & Technical Specs
| Bore (d) | Outer Diameter (D) | Width (B) | Cage Material | Precision Class | Vibration Grade | Clearance |
|---|---|---|---|---|---|---|
| 9 mm | 26 mm | 8 mm | Polymer (FG) | P6 | Z3V3 | C3 |
Advantages of DKFL 629 2RS C3 FG Z3V3P6
Z3V3 Acoustic Grade
Validated through strict acoustic and vibration testing, offering silent operation and minimized mechanical noise.
FG Polymer Cage
Lightweight and low-friction, this cage ensures optimal performance at high RPMs without excessive heat generation.
P6 Precision Accuracy
Tight tolerances minimize run-out, preventing shaft wobbling and uneven brush wear in armatures.
C3 Thermal Clearance
Neutralizes thermal expansion during continuous operation, preventing seizures in high-load scenarios.
2RS Sealing
Protects internal lubrication from escaping and blocks abrasive dust ingress.
Chrome Steel Alloy
High-chromium steel with super-finished raceways for extended fatigue life.
Primary Applications
- Power Tool Armatures: Angle grinders, drills, demolition hammers, and rotary tools (e.g., Bosch, Makita, DeWalt).
- Miniature Spindles & Small CNC Routers: Requiring high speed and low thermal generation.
- Medical & Dental Equipment: Where silent, vibration-free operation is mandatory.
- High-Speed Industrial Fans/Blowers: Maintenance-free requirements.
- Precision Servos & Encoders: Using 9mm shafts with strict P6 geometric accuracy requirements.
Buying Guide & Technical Advice
- FG Cage vs. Steel Cage: Steel cages in high-speed applications often vibrate and generate noise. The FG polymer cage guides balls smoothly, reduces friction, and is vital for RPMs exceeding 20,000.
- C3 & Z3V3 Balance: While C3 clearance is often associated with looser tolerances, DKFL’s Z3V3 certification proves this bearing maintains both thermal resilience and acoustic silence simultaneously.
- Verify Size: Ensure your shaft is exactly 9mm. Do not confuse this with 608 (8mm shaft) or 6000 (10mm shaft) series bearings.
- Authenticity: Look for the laser-engraved DKFL 629 2RS C3 FG Z3V3P6 marking and hologram-sealed packaging.
Installation & Maintenance
1) Press Fitting
The 629 is a miniature bearing. Hammering the outer ring or cage will deform it. Always apply press force only to the inner ring (9mm bore).
2) Do Not Clean with Solvents
Do not use thinners or gasoline, as they damage the rubber seals and the polymer cage. The bearing comes pre-lubricated and is ready for installation.
3) Inspect Housing
Always check the rubber damping ring in the tool housing. If the housing is worn or loose, even a new bearing will vibrate.
FAQ
1) What is the function of the "FG" suffix?
"FG" indicates a fiber-reinforced polyamide cage. It is lighter and produces less friction than steel cages, making it ideal for high-speed power tools.
2) What does Z3V3 mean?
It signifies the bearing has passed the highest grade of acoustic (Z3) and vibration (V3) testing, guaranteeing an ultra-quiet operation.
3) What are the exact dimensions?
The bearing dimensions are 9mm (bore) x 26mm (OD) x 8mm (width).
4) Is it suitable for high-speed drills?
Yes, thanks to its high-speed grease, C3 clearance, and 2RS sealing, it is an excellent choice for armature repairs in high-speed tools.
Conclusion
The DKFL 629 2RS C3 FG Z3V3P6 miniature bearing offers a perfect combination of polymer-cage performance, C3 thermal safety, Z3V3 silence, and P6 accuracy. If you want to eliminate overheating and excessive vibration in your equipment, this DKFL model is the most reliable engineering choice.
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