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When a wobbly shaft, noisy wheel hub, or seized pivot point brings your project to a halt, the right deep groove ball bearing makes all the difference. Whether you are a maker building a CNC router, a hobbyist repairing a skateboard, or a technician servicing small motors, these metal-shielded rotation bearings deliver consistent, low-friction performance across a wide range of applications.
Each bearing features a deep groove raceway design with dual ZZ metal shields (or RS rubber seal on select sizes) to keep contaminants out and grease in. Available in 440 Stainless Steel and 304 Stainless Steel, with inner diameters ranging from 3 mm (0.12 in) to 65 mm (2.56 in) and outer diameters from 9 mm (0.35 in) to 130 mm (5.12 in). Thickness spans 4 mm (0.16 in) to 31 mm (1.22 in) depending on the series selected.
These bearings suit a broad range of use cases: precision spindle assemblies requiring low-noise deep groove ball bearings, RC car and drone builds needing lightweight stainless steel miniature bearings, and industrial repair work calling for corrosion-resistant ZZ shielded bearings in wet or chemically exposed environments.
| Bearing Type | Deep Groove Ball Bearing |
|---|---|
| Shield Type | ZZ (dual metal shield); RS (rubber seal) on S6813RS |
| Material Options | 440 Stainless Steel / 304 Stainless Steel |
| Inner Diameter (ID) | 3 mm – 65 mm (0.12 in – 2.56 in) — see variant options |
| Outer Diameter (OD) | 9 mm – 130 mm (0.35 in – 5.12 in) — see variant options |
| Width / Thickness (T) | 4 mm – 31 mm (0.16 in – 1.22 in) — see variant options |
| Bearing Series | 600 / 620 / 623–629 / 624–629 / 68x / 69x / 6000–6010 / 6200–6210 / 6300–6310 / 6800–6813 |
| Dimensional Standard | ISO / JIS metric |
| Lubrication | Factory-greased (sealed, non-serviceable) |
| Operating Temperature | See variant options |
| Available Quantities | 1 Pcs / 5 Pcs |
Match the three dimensions shown in the Size (ID×OD×T) option to your application: Inner Diameter (ID) must match your shaft diameter, Outer Diameter (OD) must fit your housing bore, and Thickness (T) must fit within your available axial space. Use a caliper to measure your existing bearing or shaft before ordering.
440 Stainless Steel is a martensitic grade hardened for higher load capacity and wear resistance — a good choice for high-speed or high-load mechanical applications. 304 Stainless Steel is an austenitic grade with superior corrosion resistance, making it better suited for wet, marine, or chemically exposed environments where rust prevention is the priority.
ZZ indicates dual metal (pressed-steel) shields on both sides of the bearing. The shields retain factory grease and block coarse contaminants without contacting the inner ring, which keeps friction low. They are not fully sealed against liquids — for wet environments, look for the RS (rubber seal) variant such as S6813RS.
These bearings follow ISO/JIS metric standards and are direct drop-in replacements for any application using the same ID×OD×T dimensions. Common fits include 608ZZ (8×22×7 mm) for skateboards and 3D printers, 6200ZZ (10×30×9 mm) for motors, and miniature 600-series bearings for RC and drone builds. Always confirm dimensions before ordering.
Both stainless steel grades offer significantly better corrosion resistance than standard carbon steel bearings. For outdoor or marine use, 304 Stainless Steel is recommended for its superior rust resistance. The ZZ metal shields provide basic splash protection; for full submersion or high-pressure wash-down, consider an RS-sealed variant.
If you need a single replacement for a repair, the 1 Pcs option is the most economical choice. If you are building a project that requires multiple bearings of the same size — such as a CNC machine, conveyor, or multi-axis robot — the 5 Pcs option offers a lower per-unit cost and ensures you have spares on hand for future maintenance.
Deep groove ball bearings are primarily designed for radial loads (perpendicular to the shaft). They also accommodate moderate axial (thrust) loads in both directions due to the deep raceway geometry. They are not suitable for heavy pure-thrust applications — for those, angular contact or thrust bearings are more appropriate.
