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When a seized bearing brings your project to a halt — whether it's a skateboard truck, a small motor, or a 3D printer carriage — the root cause is almost always inadequate sealing or inconsistent tolerances. Hobbyists, makers, and maintenance technicians who demand drop-in reliability need bearings that hold their grease, resist contamination, and run quietly from the first spin. HCH deep groove ball bearings in the 604–699 series are engineered to meet exactly that standard.
Each bearing is manufactured to standard metric dimensions and is available in two seal configurations: ZZ (dual metal shield, low drag, suitable for dry or lightly lubricated environments) and 2RS (dual rubber contact seal, superior dust and moisture exclusion). Bore diameters span 4 mm to 9 mm (approximately 0.157 in to 0.354 in), outer diameters from 11 mm to 26 mm (0.433 in to 1.024 in), and widths from 4 mm to 8 mm (0.157 in to 0.315 in), covering the full 60x, 62x, 68x, and 69x sub-series.
Typical use cases include RC car wheel hubs and steering pivots, fidget spinner and skateboard wheel axles, CNC router spindle pre-load stacks, small pump impeller shafts, and fan motor front/rear supports — all applications where a compact, pre-lubricated, sealed bearing eliminates the need for external lubrication schedules.
Choose ZZ metal shields for minimal friction and easy re-lubrication access, or 2RS rubber contact seals for maximum exclusion of dust, water splash, and fine particulates in workshop or outdoor environments.
Stocking 44 bearing numbers across four sub-series (60x, 62x, 68x, 69x) means you can source matched pairs or mixed stacks from a single listing — bore sizes 4 mm through 9 mm, OD 11 mm through 26 mm.
HCH (Hangzhou Bearing) is an ISO-certified bearing manufacturer whose products meet ABEC-3 / P6 dimensional tolerances as standard, ensuring consistent fit across batches.
Each bearing ships pre-packed with lithium-based grease appropriate for general-purpose radial loads, eliminating the need for initial lubrication before installation.
Available in 1, 2, 5, 10, and 100-piece packs — order a single replacement or stock a full workshop supply at a lower per-unit cost without minimum order commitments.
Suitable for radial and light axial loads in RC vehicles, power tools, 3D printers, inline skates, small pumps, fans, and general machinery where a compact sealed bearing is specified.
| Brand | HCH |
|---|---|
| Series | 604, 605, 606, 607, 608, 609 / 624–629 / 685–689 / 695–699 |
| Seal Type | ZZ (metal shield) / 2RS (rubber contact seal) |
| Bore Diameter (I.D.) | 4 mm – 9 mm (0.157 in – 0.354 in) |
| Outer Diameter (O.D.) | 11 mm – 26 mm (0.433 in – 1.024 in) |
| Width (Thickness) | 4 mm – 8 mm (0.157 in – 0.315 in) |
| Tolerance Grade | ABEC-3 / P6 (standard) |
| Lubrication | Pre-greased (lithium-based grease) |
| Material — Rings & Balls | Chrome steel (GCr15) |
| Cage Material | Steel (ZZ) / Steel or nylon (2RS, see variant) |
| Operating Temperature | -20°C to +120°C (-4°F to +248°F) |
| Available Quantities | 1, 2, 5, 10, 100 PCS per order |
| Exact Dimensions by Bearing No. | See variant options |
ZZ bearings use thin metal shields that do not contact the inner ring, resulting in lower drag and slightly higher speed ratings. They are ideal for clean, dry, or lightly oiled environments such as electric motors and precision instruments. 2RS bearings use rubber lips that contact the inner ring, providing a much tighter seal against dust, moisture, and fine particles — making them the better choice for outdoor use, skateboards, RC vehicles, and any application exposed to contamination.
Match the bearing number to the shaft diameter (bore) and housing bore (outer diameter) of your application. For example, a 608 bearing has a 8 mm bore, 22 mm OD, and 7 mm width — the standard size used in most inline skates and skateboards. Refer to the "Size (I.D × O.D × Thickness) & Amount" option in the variant selector to confirm dimensions before ordering.
Deep groove ball bearings in the 60x–69x series are designed for radial loads with the ability to handle moderate axial (thrust) loads in both directions. For the small bore sizes in this listing (4–9 mm), dynamic load ratings typically range from approximately 0.5 kN to 3.5 kN depending on the specific bearing number. For heavy shock loads or purely axial applications, a different bearing type may be more appropriate. Contact us to confirm suitability for your specific load case.
The rings and balls are made from chrome steel (GCr15), which offers good wear resistance but is not stainless. The 2RS rubber seal provides a barrier against water splash and humidity ingress, extending service life in damp conditions. For fully submerged or highly corrosive environments, stainless steel bearings would be a more suitable choice. Light surface rust on the outer ring after prolonged exposure to moisture is possible with standard chrome steel.
In most applications — such as a single wheel hub or a motor with one bearing at each end — you can replace a single failed bearing. However, if both bearings in a paired arrangement (e.g., front and rear of a shaft) have similar run hours, replacing both at the same time is recommended to avoid a second failure shortly after the first repair. The 2-pack and 5-pack options in this listing make it economical to replace matched pairs.
Always apply installation force to the ring that is being press-fitted — never through the balls. Use a bearing press, a correctly sized socket, or a stepped installation tool that contacts only the outer ring (when pressing into a housing) or only the inner ring (when pressing onto a shaft). Avoid hammering directly on the bearing face. Ensure the shaft and housing are clean, free of burrs, and within the recommended tolerance fit (typically h6 for the shaft, H7 for the housing for a normal interference fit).
For a single repair or prototype build, the 1-piece or 2-piece pack is the most cost-effective entry point. Makers and hobbyists who regularly work with RC vehicles, 3D printers, or skateboards often find the 5-piece or 10-piece pack offers a good balance of unit cost and stock on hand. The 100-piece pack is suited for workshop stock, small-batch production runs, or resellers who need a consistent supply of a specific bearing number.
