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693 ZZ Miniature Deep Groove Ball Bearing 3x8x4mm
The 693 ZZ deep groove ball bearing measures 3mm inner diameter, 8mm outer diameter, and 4mm width. Built for high-RPM micro applications, it delivers stable rotation at speeds up to 63,000 RPM. A compact solution where every gram and every millimeter counts.
Key Specifications
- Sealing: ZZ (double metal shields, non-contact)
- Speed Rating: 63,000 RPM (grease), 75,000 RPM (oil)
- Load Capacity: 0.56 kN dynamic, 0.18 kN static
- Temperature Range: -30°C to +120°C (standard grease)
Material: GCr15 bearing steel (equivalent to AISI 52100)
For any inquiries, please contact with our Supporting Team at sales@yuanhecd.com.
| Model | 693 ZZ |
| Type | Shielded |
| Bore Dia (d). | 3 mm |
| Outside Dia (D). | 8 mm |
| Width (B) | 4 mm |
| ABEC Tolerance | 3 |
| Dynamic Load Capacity (kN) | 0.15kN |
| Static Load Capacity (kN) | 0.18kN |
| Max. RPM | 63,000RPM |
| Temp. Range (℃) | -40~120℃ |
| Material | Steel |
| Shield Material | （SPCC）Mild steel ( SPCC) |
| Lubrication | Grease |
The 693 ZZ miniature deep groove ball bearing measures 3mm bore diameter, 8mm outer diameter, and 4mm width. With double metal shields and a 63,000 RPM speed rating, it handles light-duty high-speed applications in compact mechanisms where size constraints rule out larger bearings.
Bore x OD x Width
3 x 8 x 4 mm
Dynamic Load Cr
0.15 kN
Static Load Cor
0.18 kN
Max Speed
63,000 RPM
Shielding
ZZ Metal
Precision
ABEC-3
Sealing and Lubrication
The ZZ suffix indicates double metal shields pressed into the outer ring on both sides. These non-contact shields form a narrow labyrinth gap with the inner ring shoulder. Unlike rubber contact seals (2RS), ZZ shields create zero sliding friction at high speed. This makes them the preferred choice for miniature bearings operating above 40,000 RPM.
Metal shields block dust and airborne contaminants from reaching the raceway while retaining the factory-packed grease. The standard fill is a low-noise lithium-based grease rated to 120°C. Yuanhe offers alternative lubricants for higher temperatures, vacuum environments, or low-outgassing requirements on request.
Performance
With a dynamic load rating of 0.15 kN and static load rating of 0.18 kN, the 693 ZZ suits light preload and moderate radial loads in miniature mechanisms. Its 63,000 RPM grease-lubricated speed rating makes it one of the fastest in the 3mm-bore family. The bearing is manufactured to ABEC-3 precision as standard. Raceways are honed to a low-vibration surface finish. Each batch ships with an inspection report documenting radial play, bore tolerance, and noise level.
This bearing is part of Yuanhe’s deep groove ball bearing range. For applications needing higher load capacity at the same bore size, consider the wider 603 ZZ (3x9x5mm). Browse the precision bearing catalog for full specifications across all sizes.
OEM and Customization
Yuanhe supplies 693 ZZ bearings with custom radial clearance (C2, CN, C3), alternative greases (high-temperature, low-outgassing, food-grade), and cage materials (stamped steel, brass, or polyamide). MOQ starts at 1,000 pcs for standard configurations and 5,000 pcs for custom specifications.
Submit your custom bearing specification for a quote. Yuanhe has completed 12,000+ OEM projects for clients across 30+ countries.
Applications
Micro motors and miniature cooling fans
RC drones, servos, and model aircraft
Dental handpieces and surgical rotary instruments
Precision instruments and optical encoders
Medical pumps and laboratory equipment
Frequently Asked Questions
FAQ
What is the smallest shaft compatible with the 693 ZZ? +
The 693 ZZ has a 3mm bore, making it one of the smallest standard miniature deep groove ball bearings. It fits 3mm diameter shafts with h5 or j5 tolerance for press-fit. The compact 3x8x4mm envelope suits micro-mechanisms, precision instruments, and miniature gear trains.
Can the 693 ZZ handle axial loads? +
The 693 ZZ supports limited axial loads in both directions, approximately 10% of its radial capacity. For a bearing this small, axial loads should stay under 0.01 kN. If your application has dominant thrust loads, consider a miniature thrust bearing or angular contact pair instead of a deep groove design.
What cage material is used in the 693 ZZ? +
The 693 ZZ uses a pressed steel cage (SPCC) as standard. For higher-speed applications above 40,000 RPM, a polyamide (PA66) cage can be specified for reduced inertia and quieter operation. Brass machined cages are available for high-temperature applications above +120C.
How is the 693 ZZ lubricated from the factory? +
The 693 ZZ ships with a fill of low-noise polyurea grease, approximately 25-30% of the free internal volume. The grease is designed for the life of the bearing under normal operating conditions. No regreasing is needed. For extreme speeds or temperatures, alternative greases can be specified at order time.
