Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
When your build demands reliable rotation in a compact footprint, undersized or mismatched bearings cause wobble, noise, and premature failure. Engineers, robotics builders, RC hobbyists, and precision-equipment technicians need miniature ball bearings they can trust to run quietly and hold tolerance across thousands of cycles.
These miniature ZZ-series ball bearings feature a steel double-shield (ZZ) construction that keeps lubricant in and contaminants out. Available in 13 standard sizes spanning the 623ZZ through 629ZZ series, inner diameters range from 3 mm (0.12 in) to 9 mm (0.35 in), outer diameters from 10 mm (0.39 in) to 26 mm (1.02 in), and widths from 4 mm (0.16 in) to 8 mm (0.31 in). Each bearing is pre-lubricated and ready to install.
Typical applications include 3D printer carriage and extruder assemblies requiring low-friction miniature ball bearings, brushless motor and drone arm pivot points needing compact ZZ-shielded bearings, and small CNC router spindle supports where micro ball bearing precision is critical.
| Bearing Type | Deep Groove Ball Bearing, Double-Shielded (ZZ) |
|---|---|
| Series | 623ZZ, 604ZZ, 624ZZ, 685ZZ, 605ZZ, 625ZZ, 606ZZ, 626ZZ, 607ZZ, 688ZZ, 608ZZ, 628ZZ, 629ZZ |
| Inner Diameter (ID) | 3 mm – 9 mm (0.12 in – 0.35 in) — See variant options |
| Outer Diameter (OD) | 10 mm – 26 mm (0.39 in – 1.02 in) — See variant options |
| Width (Thickness) | 4 mm – 8 mm (0.16 in – 0.31 in) — See variant options |
| Shield Material | Pressed Steel (ZZ) |
| Lubrication | Pre-greased (factory-applied) |
| Tolerance Standard | Standard metric (ABEC equivalent) |
| Operating Temperature | See variant options |
| Available Quantities | 1 / 3 / 5 / 10 / 20 / 50 / 100 pcs |
Match the bearing to your shaft diameter (ID), housing bore (OD), and available axial space (width). For example, if your shaft is 5 mm, look at 605ZZ (5×14×5 mm), 625ZZ (5×16×5 mm), or 685ZZ (5×11×5 mm) depending on how much radial space you have. Always measure your existing bearing or seat before ordering.
"ZZ" indicates a double steel shield — one pressed-steel shield on each side of the bearing. The shields retain the factory grease and prevent coarse contaminants from entering the raceway. ZZ bearings are non-contact shields, so they produce less friction than rubber-sealed (2RS) bearings while still offering good protection in clean-to-moderate environments.
Yes. These miniature deep-groove ball bearings handle both radial and moderate axial loads, making them well-suited for RC vehicle wheel hubs, steering pivots, brushless motor shafts, and drone arm pivots. For high-shock or heavy-load applications, verify the dynamic load rating against your specific load requirements.
The steel shields and races offer standard corrosion resistance suitable for indoor and dry-environment use. For applications with regular water exposure or high humidity, consider adding a compatible bearing grease after installation or look for stainless-steel variants. Occasional light moisture contact is generally tolerated with the factory grease intact.
Many popular FDM printers use 608ZZ (8×22×7 mm) bearings in idler pulleys and extruder assemblies, and 625ZZ or 624ZZ in carriage systems. Check your printer's BOM or existing bearing markings to confirm the exact size needed, then select the matching variant above.
No. These bearings are pre-lubricated at the factory and ready to install straight from the package. Avoid washing out the factory grease with solvents. If you are operating in an extreme-temperature or high-speed environment, you may choose to supplement with a compatible bearing grease after removing the shields.
For prototyping or a single repair, the 1- or 3-piece options keep costs low. For a full printer build or RC kit that uses multiple bearings of the same size, the 5- or 10-piece packs offer better per-unit value. Production runs or workshop stock are best served by the 50- or 100-piece packs.
