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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.
Get a quote within 24 hours for your miniature equipment spare parts bulk order
2. Technical Specifications
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
MR166Z: Single Z single metal shield, CN standard clearance
MR166ZZ: Double ZZ double metal shields, CN standard clearance
MR166-2ZC3: Double ZZ double metal shields, C3 enlarged clearance
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
3. Key Advantages
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.
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.
Reduce precision micro equipment downtime and lower overall production maintenance expenses
4. Application Scope
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
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
5. Why Choose GQZ MR Series Miniature Bearing
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
We supply low-friction high-speed miniature metal shield bearings for compact micro motor and automation equipment
6. Complete Quality Assurance System
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
7. Get a Quote Now
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
8. FAQ
Q1: Are MR166Z, MR166ZZ and MR166-2ZC3 physically interchangeable?
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.
Q2: What is the difference between CN normal clearance and C3 clearance?
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.
Q3: What failure phenomena require replacement of MR166 series miniature bearing?
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.
Company Details
Bronze Gleitlager
,
Bronze Sleeve Bushings
and
Graphite Plugged Bushings
from Quality China Factory
Business Type:
Manufacturer,Distributor/Wholesaler,Exporter,Trading Company
Year Established:
1989
Total Annual:
1000000-10000000
Employee Number:
10~100
Ecer Certification：
Verified Supplier
Established in 1999, Wuxi Guangqiang Bearing Trade Co.,Ltd works hard in researching and manufacturing high quality bearings and rely on it's advantages of strong technologies, advanced equipment, professional technical team, quality production and reasonable prices has gain a broad... Established in 1999, Wuxi Guangqiang Bearing Trade Co.,Ltd works hard in researching and manufacturing high quality bearings and rely on it's advantages of strong technologies, advanced equipment, professional technical team, quality production and reasonable prices has gain a broad...
