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When a motor shaft wobbles, a skateboard wheel grinds, or a 3D printer carriage binds, the culprit is almost always a worn or undersized bearing. Engineers, hobbyists, and repair technicians who need a metal shielded deep groove ball bearing in an exact size — without ordering a full industrial lot — face a frustrating search. This listing solves that by offering 32 individual size options in a single place, from compact 3×9×5 mm units up to robust 65×100×18 mm rings.
Each bearing consists of an inner ring, outer ring, a complement of steel balls, and a pressed-steel shield on both faces. The shield keeps lubricant in and airborne particles out without adding the drag of a rubber seal. Inner diameters span 3 mm to 65 mm (approximately 0.12″ to 2.56″); outer diameters range from 9 mm to 110 mm (approximately 0.35″ to 4.33″); width runs 4 mm to 27 mm (approximately 0.16″ to 1.06″). All dimensions follow standard metric series, making cross-referencing straightforward.
Typical applications include DC and stepper motor shafts in CNC routers and 3D printers, inline skate and skateboard wheel axles, RC car and drone pivot points, small appliance spindles, and general-purpose DIY machinery where a compact, low-friction radial bearing is required. The open-bore design also suits light axial loads in both directions, making these metal shielded deep groove ball bearings a versatile choice for mixed-load assemblies.
Dual pressed-steel shields — Retain factory grease and block dust and debris without the rotational drag of contact rubber seals, extending service intervals in lightly contaminated environments.
32 metric size options in one listing — Inner diameters from 3 mm to 65 mm let you match the exact shaft size without adapters or custom machining, covering the most common DIY and light-industrial dimensions.
Deep groove raceway geometry — The curved raceway profile handles both radial and moderate axial (thrust) loads in either direction, making these bearings suitable for mixed-load applications beyond simple radial support.
Pre-greased and ready to install — Each unit ships with grease already packed between the shields, so no additional lubrication step is needed before fitting to a shaft or housing.
ISO metric tolerances — Dimensions conform to standard metric bearing series, enabling direct substitution for OEM bearings identified by inner × outer × width measurements without special ordering.
Low-friction steel ball complement — Precision-ground steel balls run in matched raceways to minimize rolling resistance, keeping heat generation low in continuous-duty applications such as motor spindles and conveyor rollers.
| Bearing Type | Deep Groove Ball Bearing |
|---|---|
| Shield Type | Dual metal (pressed steel) shields, both sides |
| Inner Diameter Range | 3 mm – 65 mm (approx. 0.12″ – 2.56″) |
| Outer Diameter Range | 9 mm – 110 mm (approx. 0.35″ – 4.33″) |
| Width Range | 4 mm – 27 mm (approx. 0.16″ – 1.06″) |
| Available Sizes | See variant options |
| Lubrication | Pre-greased (grease packed between shields) |
| Load Direction | Radial (primary); light axial in both directions |
| Dimension Standard | ISO metric bearing series |
| Quantity per Order | See variant options |
Measure the shaft diameter (inner diameter), the housing bore (outer diameter), and the available axial space (width) with calipers. Match those three numbers to the variant listed as Inner Dia × Outer Dia × Thickness. For example, a shaft of 8 mm, housing bore of 22 mm, and 7 mm of axial space corresponds to the 8×22×7 mm variant — equivalent to a standard 608 bearing.
A metal shield is a non-contact guard pressed into a groove in the outer ring. It keeps grease in and large particles out while adding virtually no drag. A rubber seal makes light contact with the inner ring, offering better contamination exclusion but slightly higher friction. Metal-shielded bearings are preferred for higher-speed applications or where minimizing rotational resistance matters more than maximum sealing.
Deep groove ball bearings can accommodate moderate axial loads in both directions in addition to their primary radial load capacity. They are not designed for heavy or sustained thrust loads — for those applications, angular contact or thrust bearings are more appropriate. For typical DIY and light-machinery use (motors, wheels, rollers), the axial capacity of these bearings is generally sufficient.
No. Each bearing is pre-greased at the factory with grease packed between the two metal shields. You can install it directly onto the shaft and into the housing without any additional lubrication step. If the bearing is used in a high-temperature or high-speed environment beyond typical DIY ranges, consult the grease specification for your specific operating conditions.
Yes, where the inner × outer × width dimensions match a standard series number, these bearings are dimensionally interchangeable. For example, 8×22×7 mm = 608, 10×26×8 mm = 6000, 10×35×11 mm = 6200, 12×28×8 mm = 6001, 12×37×12 mm = 6201. Always verify all three dimensions before substituting, as some series share an inner diameter but differ in outer diameter or width.
The inner ring, outer ring, and ball complement are steel. The shields are pressed steel. This construction provides the strength and dimensional stability needed for rotating machinery. These bearings are not rated for submerged or highly corrosive environments; for such conditions, stainless steel or ceramic hybrid bearings would be more appropriate.
Standard skateboard and most inline skate wheels use an 8×22×7 mm bearing (608 designation). Select the 8×22×7 mm variant in this listing. Some larger inline skate frames use a 7×19×6 mm (607) or 9×24×7 mm (609) bearing — check your wheel's axle diameter and hub bore before ordering if you are unsure.
