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686 2RS Miniature Deep Groove Ball Bearing 6×13×5mm
Double rubber sealed, grease-lubricated miniature bearing for OD-constrained assemblies where 13mm is the housing limit. 6mm bore, 13mm OD, 5mm width. GCr15 chrome steel, ABEC-1 to ABEC-5, 36,000 RPM with 2RS seals. Three-lip NBR contact seals proven on 100,000+ piece production runs.
Key Specifications
- Double NBR rubber contact seals (2RS), three-lip geometry, factory-filled Chevron SRI-2 polyurea grease
- 36,000 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; FKM seals and high-temp grease extend 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 2RS bearing
| Model | 686 2RS |
| 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 | (NBR+SPCC) Nitrile rubber + mild steel (NBR + SPCC) |
| Lubrication | Grease |
The 686 2RS is the most compact bearing in Yuanhe’s 6mm-bore catalogue. With a 13mm OD and 5mm width, it fits housings where no larger bearing can go ; dental handpiece turbines, micro motor end bells, optical encoder spindles. Three-lip NBR contact seals keep contamination out while preserving torque budget. GCr15 chrome steel, ABEC-1 to ABEC-5, 100% noise-tested.
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
40,000 RPM
Sealing
Open / ZZ / 2RS
Precision
ABEC-1 / ABEC-3
Sealing and Lubrication
The 686 2RS features double nitrile rubber (NBR) contact seals on both sides. The three-lip seal geometry ; outer deflector, center contact lip, and inner noncontact labyrinth ; keeps drag torque 20% to 30% lower than single-lip designs while blocking dust, moisture, and fine debris.
At 36,000 RPM, seal drag consumes roughly 15% to 20% of the bearing’s torque budget. For clean, dry cavities where speed matters more than sealing, the 686 ZZ metal-shielded variant reaches 43,000 RPM. Factory-filled with Chevron SRI-2 polyurea grease; no relubrication required under normal conditions. For washdown or chemical exposure, FKM seals and PFPE greases replace the standard NBR and polyurea fill.
Performance
Dynamic load rating 1.08kN reflects the geometric ceiling of seven 2mm balls in a 3.5mm ring cross-section at 13mm OD. Static load rating 0.44kN. For comparison, the 696 (6 x 15 x 5mm) reaches 1.73kN by adding 2mm to the OD ; a 60% increase. If your housing allows 15mm, the 696 is the higher-margin choice; if it does not, the 686 is the bearing.
Our deep groove ball bearing range spans ABEC-1 through ABEC-5 precision grades. ABEC-5 holds radial runout under 3um and ships with an individual Mahr roundness trace. Mounting precision is critical at this scale: the outer ring wall is under 0.9mm at the raceway bottom. H6 housing bore and j6 shaft are minimum. Aluminum housings require C3 clearance ; the CTE mismatch opens the fit roughly 8um across a 60C thermal swing.
OEM and Customization
Yuanhe configures the 686 2RS across four axes at our OEM manufacturing facility. Internal clearance: CN standard; C2 for encoder spindles with sub-2um deflection targets; C3 for press fits; C4 for sustained high-temperature operation. Lubrication: Chevron SRI-2 standard; Lubcon Turmogrease L 252 for low-noise applications (3dB to 5dB reduction); Kluber Isoflex NBU 15 for sustained speeds above 30,000 RPM; NSF H1 food-grade and PFPE vacuum greases on request.
Cage options: pressed steel, machined brass, or PA66-GF nylon. Material options: GCr15 standard; 440C stainless for autoclave and food contact; hybrid ceramic (Si3N4 balls) for speeds above 40,000 RPM. Every bearing is 100% noise-tested and ships with a batch inspection report. Lead time 7 to 15 working days. MOQ 100 pieces for standard builds; prototype volumes negotiable. Contact us with your drawing or specification for a quotation.
Applications
Dental high-speed handpiece turbines
Surgical oscillating saw heads
Coreless micro DC motor end bells
Optical encoder spindles
Laser scanning mirror bearings
Turbine flow meter rotors
Laboratory micro-centrifuge rotors
Food-grade dispenser pump shafts
RC servo and drone gimbal pivots
Portable insulin pump drives
Camera lens autofocus actuators
MEMS gyroscope gimbal pivots
Frequently Asked Questions
What does 2RS mean on the 686 bearing? +
2RS indicates the bearing has two nitrile rubber (NBR) contact seals, one on each face. These seals press against the inner ring shoulder, trapping factory-filled grease inside while blocking dust, moisture, and fine debris. The 686 2RS is speed-rated at 36,000 RPM with grease. For higher speeds in clean environments, consider the 686 ZZ variant with metal shields (43,000 RPM).
What is the load capacity of the 686 2RS? +
Dynamic load Cr = 1.08 kN, static load Cor = 0.44 kN. This is the physical limit of a 6 x 13 x 5mm bearing with seven 2mm balls. If your application requires more load capacity, the 696 (6 x 15 x 5mm) carries 1.73 kN with only 2mm more OD. Submit your load case to our engineering team for a bearing life calculation under your specific conditions.
Can I order the 686 2RS with custom clearance or grease? +
Yes. Yuanhe supplies the 686 2RS in CN (standard), C2 (tight, for sub-2um deflection), C3 (press-fit), and C4 (high-temperature) internal clearance grades. Alternative greases include Lubcon Turmogrease L 252 for low-noise applications, Kluber Isoflex NBU 15 for sustained high-speed operation, and NSF H1 food-grade grease. Cages can be pressed steel, machined brass, or PA66-GF nylon. See our OEM customization page for the full options list.
What temperature range can the 686 2RS handle? +
Standard NBR seals and polyurea grease operate from -20C to +120C. With FKM (Viton) seals and high-temperature grease, the upper limit extends to +150C. For autoclave sterilization or sustained exposure above +150C, specify 440C stainless steel rings with FKM seals. For the most demanding chemical and thermal environments, full-ceramic (Si3N4) configurations are available ; contact our engineers to discuss your requirements.
Other types of ball bearings are also available: 624 2RS, 623 2RS, 604 2RS, 604 ZZ, 605 2RS, 605 ZZ.
