Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
When a worn or undersized bearing causes wobble, noise, or premature failure in your build, finding an exact-fit replacement matters. These deep groove ball bearings in the 624Z–629Z series are designed for hobbyists, makers, and engineers who need dependable radial load support in compact rotating assemblies — from RC vehicles and power tools to 3D printers and small motors.
Each bearing is manufactured from bearing steel (chrome steel, GCr15 equivalent) with a single metal shield (Z suffix) on one side, providing a balance of dust protection and low friction. The series spans inner diameters of 4–9mm and outer diameters of 13–26mm, with widths of 5–8mm depending on the size selected. Available in packs of 1, 5, 10, or 50 pieces to suit both one-off repairs and bulk project needs.
Typical use cases include replacement bearings for brushless motor shafts (624Z, 625Z), skateboard wheel axle upgrades (626Z, 627Z), and precision spindle support in CNC router Z-axis assemblies or lathe tailstocks (628Z, 629Z) — all long-tail applications where dimensional accuracy and consistent radial clearance are critical.
| Series | 624Z, 625Z, 626Z, 627Z, 628Z, 629Z |
|---|---|
| Inner Diameter (ID) | 4mm / 5mm / 6mm / 7mm / 8mm / 9mm (see variant options) |
| Outer Diameter (OD) | 13mm / 16mm / 19mm / 22mm / 24mm / 26mm (see variant options) |
| Width | 5mm / 5mm / 6mm / 7mm / 8mm / 8mm (see variant options) |
| Material | Bearing Steel (Chrome Steel, GCr15 equivalent) |
| Shield Type | Single Metal Shield (Z — one side) |
| Bearing Type | Deep Groove Ball Bearing |
| Load Direction | Radial + moderate axial (both directions) |
| Lubrication | Factory-greased (light grease pre-applied) |
| Standard | ISO 15 / JIS B 1521 (miniature bearing series) |
| Available Quantities | 1 pc / 5 pcs / 10 pcs / 50 pcs |
| Weight (per piece) | See variant options |
Match the bearing to your shaft's outer diameter (which becomes the bearing's inner diameter) and your housing's inner diameter (which becomes the bearing's outer diameter). For example, if your motor shaft is 5mm and your housing bore is 16mm, select the 625Z (5×16×5mm). Always confirm the width fits your housing depth before ordering.
Yes. Chrome steel deep groove ball bearings in the 624Z–629Z range are widely used in brushless motors, spindles, and fans. The single metal shield keeps grease in and light debris out while allowing the bearing to run at moderate-to-high RPM. For very high-speed or high-temperature environments, confirm the grease specification meets your operating conditions.
The "Z" suffix indicates a single metal shield on one side of the bearing. This protects the internal balls and raceway from dust and light contamination on the shielded side, while the open side allows for re-lubrication if needed. Double-shielded bearings carry a "ZZ" designation and are not included in this listing.
Chrome steel (GCr15) bearings offer good wear resistance but are not inherently corrosion-resistant in wet or chemically aggressive environments. For outdoor, marine, or washdown applications, stainless steel bearings (e.g., 624-2RS stainless) would be more appropriate. These bearings are best suited for dry or lightly lubricated indoor mechanical assemblies.
In most cases, yes. The 624Z–629Z series follows ISO 15 / JIS B 1521 dimensional standards, so bearings with the same series designation from different manufacturers share the same ID, OD, and width. Always verify the dimensions on your existing bearing before ordering to confirm compatibility.
If you need a single replacement for a repair, the 1-piece option is the most economical entry point. For project builds, workshop stock, or production runs where you anticipate using multiple bearings of the same size, the 5, 10, or 50-piece packs offer a lower per-unit cost. The 50-piece pack is particularly cost-effective for makers who regularly work with the same bearing size.
These bearings are supplied in standard CN (Normal) radial clearance, which is the most common specification for general-purpose applications including motors, pumps, and light machinery. If your application requires C3 (greater clearance for higher temperatures or press-fit installations) or C2 (tighter clearance for high-precision spindles), please contact us to confirm availability.
