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When a seized or noisy bearing brings your RC car, 3D printer, or robotics project to a halt, finding a correctly sized replacement fast is everything. These miniature ball bearings are stocked in 11 standard sizes — from the compact 693ZZ (3 × 8 × 4 mm) up to the 6903ZZ (17 × 30 × 7 mm) — so makers, hobbyists, and light-industrial technicians can source exactly what they need without over-engineering the solution.
Each bearing is manufactured from carbon steel with a double-shield (ZZ) configuration. The two metal shields keep lubricant in and contaminants out without adding the drag of rubber seals. Inner diameters span 3 mm to 17 mm (approximately 0.12 in to 0.67 in); outer diameters range from 8 mm to 30 mm (approximately 0.31 in to 1.18 in); heights run 4 mm to 7 mm (approximately 0.16 in to 0.28 in). Available in quantities of 1, 10, 15, 20, or 50 pieces per order.
Typical applications include miniature ball bearing replacement for RC vehicles and drones, small motor shaft support in 3D printers and CNC routers, and precision pivot points in robotics arms and camera gimbals — anywhere a low-profile, double-shielded miniature bearing is required.
| Material | Carbon Steel |
|---|---|
| Shield Type | Double Metal Shield (ZZ) |
| Size Range (Inner Dia) | 3 mm – 17 mm (0.12 in – 0.67 in) |
| Size Range (Outer Dia) | 8 mm – 30 mm (0.31 in – 1.18 in) |
| Height Range | 4 mm – 7 mm (0.16 in – 0.28 in) |
| Available Sizes | 693ZZ, 694ZZ, 695ZZ, 696ZZ, 697ZZ, 698ZZ, 699ZZ, 6900ZZ, 6901ZZ, 6902ZZ, 6903ZZ |
| Pack Quantities | 1 / 10 / 15 / 20 / 50 PCS |
| Lubrication | Factory pre-greased |
| Load Type | Radial (light to moderate) |
| Operating Temperature | See variant options |
| Bearing Type | Deep Groove Ball Bearing |
Measure your shaft's outer diameter — this becomes the bearing's inner diameter (bore). Then confirm the outer diameter and width match your housing or frame cutout. The size label (e.g., 696ZZ = 6 × 15 × 5 mm) lists inner dia × outer dia × height in millimeters.
"ZZ" indicates a double metal shield on both sides of the bearing. The shields keep grease inside the bearing and prevent dust and particles from entering the raceway, making them suitable for moderately contaminated environments without adding the friction of rubber seals.
Carbon steel ZZ bearings perform well in low-to-moderate speed hobby and light-industrial applications such as RC vehicles, 3D printers, and small motors. For very high-speed or high-temperature environments, consider stainless steel or ceramic hybrid bearings instead.
Carbon steel bearings can corrode if exposed to water or high humidity over time. For wet or outdoor environments, stainless steel bearings (suffix RS or 2RS) are recommended. For dry indoor use — RC cars, 3D printers, robotics — carbon steel ZZ bearings are a practical and cost-effective choice.
Yes, provided the size code matches. These bearings follow standard dimensional conventions, so a 698ZZ from this listing will have the same 8 × 19 × 6 mm dimensions as any other 698ZZ bearing. Always verify the three dimensions (bore × OD × width) against your application before ordering.
No. These bearings are factory pre-greased and ready to install. Avoid washing out the factory grease with solvents. If the bearing is used in a high-load or high-cycle application, re-greasing after extended use may extend service life.
For a single repair or prototype, the 1 PCS option is ideal. If you're building multiple units or want spares on hand, the 10 or 20 PCS packs offer better value per bearing. The 50 PCS pack suits workshop restocking or small-batch production runs.
