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686 ZZ Miniature Deep Groove Ball Bearing 6×13×5mm
Double metal shielded, grease-lubricated miniature bearing for high-speed applications where OD is capped at 13mm. 6mm bore, 13mm OD, 5mm width. GCr15 chrome steel, ABEC precision tolerance, 43,000 RPM with ZZ shields. The narrowest-OD bearing in the 6mm-bore lineup.
Key Specifications
- Double metal shields (SPCC steel): non-contact labyrinth gap, zero seal friction at speed
- 43,000 RPM grease speed limit; 1.08kN dynamic load, 0.44kN static load
- Radial loads with bidirectional axial capacity at reduced rating
- Operating range −20°C to 120°C standard; wide-temp grease extends to 150°C
- GCr15 bearing steel, HRC 60–64, ABEC-1/3/5 precision tolerance
For any inquiries, please contact with our Supporting Team at sales@yuanhecd.com.
686 ZZ bearing
| Model | 686 ZZ |
| Item | Miniature Ball Bearings |
| Type | Shielded |
| Bore Dia (d). | 6 mm |
| Outside Dia (D). | 13 mm |
| Width (B) | 5 mm |
| ABEC Tolerance | 3 |
| Dynamic Load Capacity (kN) | 1.08kN |
| Static Load Capacity (kN) | 0.44kN |
| Max. RPM | 46,000RPM |
| Temp. Range (℃) | -40~120℃ |
| Material | Steel |
| Shield Material | (SPCC) Mild steel ( SPCC) |
| Lubrication | Grease |
Double metal shielded miniature bearing for high-speed applications where OD is capped at 13mm. 6mm bore, 13mm OD, 5mm width. GCr15 chrome steel, ABEC precision tolerance, 43,000 RPM with ZZ shields.
Bore x OD x Width
6 x 13 x 5 mm
Dynamic Load Cr
1.08 kN
Static Load Cor
0.44 kN
Max Speed
43,000 RPM
Shielding
ZZ Metal
Precision
ABEC-3
Shielding and Lubrication
The ZZ designation indicates double SPCC steel shields pressed into the outer ring. Unlike 2RS contact seals, ZZ shields never touch the inner ring shoulder; the labyrinth gap stays open across the full speed range. At 43,000 RPM on a 13mm OD bearing, that non-contact design eliminates roughly 15-20% of the torque loss that a rubber lip seal would impose. The trade-off is sealing: ZZ shields stop coarse dust and debris but do not seal against moisture, coolant mist, or sub-micron particulate. For dry, clean cavities ; encoder housings, bench instruments, sealed motor end bells ; ZZ is the higher-speed choice. For wet or dusty cavities, the 686 2RS sealed variant provides full contact sealing at the cost of 7,000 RPM headroom (36,000 vs. 43,000). Factory-filled with Chevron SRI-2 polyurea grease; alternative greases available on request.
Performance
Single-row deep groove geometry handles combined radial and axial loads. Dynamic load rating 1.08kN ; the geometric ceiling of seven 2mm balls in a 3.5mm ring cross-section at 13mm OD. For context, the 696 (6×15×5mm) reaches 1.73kN with 2mm more OD; if the housing has room, the 696 is the higher-capacity choice. The non-contact ZZ shield design allows 43,000 RPM operation, placing the 686 ZZ between the open variant (50,000 RPM) and the 2RS sealed variant (36,000 RPM). GCr15 chrome steel rings and balls, through-hardened to HRC 60-64, with ABEC precision tolerance delivering ZV2/ZV3 noise grades in clean assemblies. At this 13mm OD, shield parallelism during press-in is critical: a tilted shield edge closes the labyrinth gap on one side and opens it on the other, trading speed for contamination risk unevenly across the bearing.
OEM and Customization
Yuanhe ships the 686 ZZ in standard CN clearance at our OEM manufacturing facility. C2 (tighter, for encoder spindles with sub-2µm deflection targets), C3 (looser, for press fits), and C4 (sustained high-temperature operation) are available for volume orders. Custom grease fills: low-noise polyurea for encoder applications, high-temperature fluorinated for sustained operation above 100°C, Kluber Isoflex NBU 15 for speeds exceeding 35,000 RPM. Cage upgrades to machined brass or PA66-GF nylon reduce mass and dampen ball-pass vibration at high speed. Batch QC reports with dimensional inspection data and 100% noise test results ship with every order. Lead time 7-15 working days. MOQ 100 pcs for standard builds; prototype quantities negotiable. Send a drawing or specification for quotation within 24 hours.
Applications
Coreless micro DC motor end bells
Optical encoder spindles
Dental handpiece turbine cartridges
RC servo and drone gimbal actuators
Laser scanning mirror bearings
Miniature peristaltic pump rotors
MEMS gyroscope gimbal pivots
High-end camera lens autofocus drives
Turbine flow meter rotors
Precision measuring instruments and dial indicators
Frequently Asked Questions
What does ZZ mean on the 686 bearing? +
ZZ indicates double metal shields (SPCC steel) pressed into the outer ring on both sides. These non-contact shields never touch the inner ring shoulder, creating a labyrinth gap that blocks coarse dust while generating zero seal friction. This enables 43,000 RPM operation ; 7,000 RPM higher than the 686 2RS sealed variant.
What is the load capacity of the 686 ZZ? +
Dynamic load Cr = 1.08 kN, static load Cor = 0.44 kN. This is the physical limit of seven 2mm balls in a 3.5mm ring cross-section at 13mm OD. For higher load requirements, the 696 (6x15x5mm) carries 1.73 kN. Contact our engineering team for a load-life calculation.
When should I choose 686 ZZ over 686 2RS? +
Choose 686 ZZ for clean, dry cavities where speed is the priority ; encoder housings, bench instruments, sealed motor end bells. The non-contact shields deliver 43,000 RPM with zero seal drag. Choose 686 2RS for wet, dusty, or washdown environments where moisture and fine particulate exclusion matters more than the 7,000 RPM speed trade-off.
Can I order 686 ZZ with custom clearance or grease? +
Yes. Standard clearance is CN. C2, C3, and C4 grades are available for volume orders. Custom grease fills include low-noise polyurea, high-temperature fluorinated, and Kluber Isoflex NBU 15 for sustained high-speed operation. Cage upgrades to machined brass or PA66-GF nylon available. Submit your specification for a quotation.
