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When a worn or undersized bearing causes wobble, noise, or premature failure in your equipment, finding an exact-fit replacement matters. Hobbyists, repair technicians, and mechanical engineers who work with small motors, RC vehicles, power tools, and precision instruments rely on 635ZZ deep groove ball bearings to restore smooth, low-friction rotation without play or vibration.
This listing includes 10 miniature deep groove ball bearings in the 635ZZ (also marked 635-2Z) designation. Each bearing measures 5mm bore (inner diameter) × 19mm outer diameter × 6mm width. The double-Z metal shields on both sides retain grease and block contaminants, keeping the rolling elements protected during continuous operation.
Typical use cases include replacement bearings for brushless hobby motors and RC car wheel hubs, spindle support in small CNC routers and 3D printer extruder assemblies, and load-bearing pivots in inline skate wheels, fidget spinners, and hand tool mechanisms — all situations where a compact 635ZZ deep groove ball bearing must handle both radial and light axial loads reliably.
| Bearing Designation | 635ZZ / 635-2Z |
|---|---|
| Inner Diameter (Bore) | 5 mm (0.197 in) |
| Outer Diameter | 19 mm (0.748 in) |
| Width | 6 mm (0.236 in) |
| Shield Type | Double metal Z-shield (both sides) |
| Bearing Type | Deep groove ball bearing |
| Material | Chrome steel (bearing races & balls) |
| Lubrication | Pre-greased |
| Load Direction | Radial (primary); light axial (both directions) |
| Quantity per Pack | 10 pieces |
| Dynamic Load Rating (Cr) | See variant options |
| Static Load Rating (C0r) | See variant options |
| Max Speed | See variant options |
Yes — 635ZZ and 635-2Z are two common notations for the same bearing. "635" identifies the bearing series and dimensions (5×19×6mm). "ZZ" or "2Z" both indicate double metal shields on both sides of the bearing. You can use either designation interchangeably when sourcing replacements.
Measure or look up three dimensions on your existing bearing or housing: bore (inner diameter), outer diameter, and width. This bearing is 5mm bore × 19mm OD × 6mm wide. If all three match, the 635ZZ is a direct fit. Also verify the shaft and housing tolerances if running at high speed or under heavy load.
Yes. The 635ZZ is a widely used size in RC car wheel hubs, brushless motor front/rear shafts, and small hobby drivetrains. The metal shields protect the grease from dirt and debris common in outdoor RC use, and the deep groove design handles the combined radial and light axial loads typical of these applications.
The Z-shields are metal (not rubber seals), so they reduce but do not fully exclude water ingress. For occasional light moisture exposure, the pre-applied grease provides adequate protection. For continuous wet or submerged conditions, look for a 635-2RS variant with rubber contact seals instead.
These bearings are pre-greased at the factory and ready to install. For most standard applications — motors, wheels, small machinery — no additional lubrication is needed before use. If your application runs at elevated temperatures or very high speeds, consult the equipment manufacturer's lubrication specification.
Each pack contains 10 bearings. Most single-axis repairs or wheel replacements require 1–2 bearings per assembly. A 10-pack is practical for multi-wheel RC builds, stocking spares for ongoing maintenance, or replacing bearings across several small motors or tools in one order.
