MR166ZZ / MR166-2ZC3 / MR166Z Deep Groove Ball Bearings with Metal Shields , 6*16*5mm
MR166Z, MR166ZZ and MR166-2ZC3 belong to the same miniature deep groove ball bearing series with unified mounting dimension 6×16×5mm, distinguished only by sealing structure and internal clearance suffix codes.
- MR166Z: Single side stamped metal dust shield (single Z)
- MR166ZZ: Double sides stamped non-contact metal dust shields (double ZZ), standard CN normal clearance
- MR166-2ZC3: Double metal ZZ shields + upgraded C3 enlarged radial clearance for high-temperature high-speed shafts
Adopt non-contact thin steel shield design with ultra-low rotational friction torque, excellent heat dissipation performance compared with rubber sealed bearings. Mirror superfinished raceway and precision steel balls support stable ultra-high-speed continuous rotation under light radial loads. The C3 clearance variant compensates thermal expansion of miniature motor spindles, avoiding bearing seizure after long-hour operation. Widely used for 3D printer extruder shafts, RC drone micro drive motors, small cooling fans, medical testing instruments, model aircraft and miniature automation transmission assemblies.
| Parameter | Value |
|---|---|
| Model | MR166Z / MR166ZZ / MR166-2ZC3 |
| Unified Basic Dimension | Inner d=6 mm, Outer D=16 mm, Width B=5 mm |
| Structure | Single Row Miniature Deep Groove Ball Bearing |
| Shield & Clearance Classification |
|
| Material | GCr15 high carbon chrome bearing steel |
| Cage | Stamped two-piece riveted thin steel cage |
| Net Weight | 0.0058 kg |
| Precision Grade | Standard P0, customizable P6/P5/P4 |
| Surface Hardness | HRC 58–65 |
| Working Temperature Range | -30℃ ~ 120℃ |
| Limiting Grease Rotating Speed | 32000 r/min |
| Basic Dynamic Load Rating Cr | 1470 N |
| Basic Static Load Rating C0r | 600 N |
| Min Fillet Radius r | 0.15 mm |
| Cross Reference | 6*16*5mm micro miniature ZZ shield bearing |
| HS Code | 8482101000 |
Complete CAD dimension drawings and micro equipment fitment list can be provided upon request
- Three model variants share identical 6×16×5mm installation size, only differ in shield quantity and clearance grade, meet different dust-proof and high-speed heat expansion demands in one product series.
- Non-contact metal ZZ dust shield structure creates tiny gap between shield and inner ring, greatly reduce rotation friction loss, guarantee superior heat dissipation for long-time high-speed micro motor operation.
- Upgraded MR166-2ZC3 C3 enlarged clearance design offsets thermal expansion of tiny high-speed spindles, effectively eliminate bearing locking and rotation lag caused by temperature rise.
- Ultra-smooth mirror superfinished inner/outer raceway and precision steel ball surface cut vibration and noise drastically, maintain silent stable running for precision testing instruments and RC model equipment.
- Lightweight thin-wall miniature structure occupies minimal installation space, ideal for compact narrow-shaft micro equipment with strict volume limits.
- Stable quenching & tempering heat treatment for GCr15 steel provides outstanding anti-fatigue performance, withstand frequent start-stop alternating light loads of miniature motors.
- Support customized clearance grade, high-speed low-viscosity special grease, OEM laser marking and neutral vacuum anti-rust packaging for global miniature machinery spare parts distributors.
This MR166 6×16×5mm miniature metal shield bearing is widely suitable for:
- 3D printer extruder and guide roller transmission shafts
- RC drone, model aircraft, remote control car micro drive motors
- Notebook cooling fans, small blower ventilation miniature rotary parts
- Medical analytical testing instruments, optical precision measuring equipment
- Miniature gear reducers, small stepping motors, beauty equipment micro rotating shafts
- Equipment repair shops and global micro industrial spare parts wholesale suppliers
Model selection guidance:
- MR166Z: Clean dry equipment only needing unilateral dust isolation
- MR166ZZ: General indoor workshop with light dust, normal speed micro motors
- MR166-2ZC3: Long-running high-speed miniature spindles prone to temperature rise
Ideal compact replacement bearing for overhaul of high-speed light-load miniature precision equipment
- Over 25 years professional manufacturing experience of MR series miniature deep groove ball bearings
- Strictly comply with international miniature bearing dimensional tolerance standards, 100% interchangeable with original MR166Z / MR166ZZ / MR166-2ZC3 bearings
- Complete production workflow covering steel forging, heat treatment, precision raceway grinding and finished noise & ultra-high-speed durability testing
- Sufficient spot stock for 6×16×5mm MR166 series three variants, fast shipment for bulk micro equipment spare parts orders
- Professional engineering team provides miniature shaft press-fit installation guidance and clearance grade selection suggestions
- Products exported to more than 50 countries, stable long-term supply for precision electronics and model equipment aftermarket suppliers
- Raw bearing steel chemical composition and hardness inspection before processing
- CNC inner/outer ring turning, raceway precision grinding and mirror superfinishing procedure
- Constant temperature quenching & tempering heat treatment to stabilize internal material stress
- Full finished product testing: internal clearance, rotation noise, rotational flexibility, ultra-high-speed endurance and light alternating load fatigue test
- Full dimensional tolerance inspection for inner ring, outer ring and width plus visual appearance scratch check
- Anti-rust oil coating + independent vacuum packaging to avoid rust during long-distance sea transportation
Every batch of MR166 miniature bearings passes full inspection before shipment to guarantee stable precision micro equipment operation
Looking for wholesale MR166Z, MR166ZZ and MR166-2ZC3 miniature metal shield bearings 6×16×5mm?
Send your inquiry to obtain:
- Competitive factory direct bulk unit price for single Z, double ZZ and C3 clearance versions
- Complete 3D printer / drone / micro motor equipment fitment checklist
- Custom clearance grade, high-speed special grease and OEM laser marking packaging solutions
- Technical support for miniature shaft bearing press-fit installation and high-speed noise troubleshooting
Detailed dimension catalog and real-time stock availability can be checked upon contact
They share the same 6×16×5mm mounting dimensions and can be installed mutually, but dust-proof capacity and internal clearance differ; select matched model according to working speed and environment dust level.
CN standard clearance fits low/medium speed normal temperature equipment; C3 enlarged clearance is reserved for continuous high-speed spindles to compensate thermal expansion and prevent seizure.
Continuous high-frequency buzzing noise at high RPM, miniature shaft obvious shaking, slow rotation and jamming after long running, metal dust leaking out from shield gap.
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