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When a worn or noisy bearing starts causing wobble in a motor shaft, spindle, or wheel hub, finding the right replacement quickly matters. Engineers, hobbyists, and maintenance technicians working on RC vehicles, power tools, inline skates, conveyor rollers, and small electric motors rely on standardized deep groove ball bearings that drop in without modification. These HCH 604–609 series bearings are stocked in both ZZ (metal shield) and 2RS (rubber seal) configurations across six bore sizes, so you can match the exact spec your application demands.
Each bearing is constructed from chrome steel (GCr15) inner and outer rings with a pressed steel or nylon cage and precision-ground raceways. The ZZ variants use non-contact metal shields on both sides, while the 2RS variants use contact rubber seals for superior grease retention in dusty or lightly wet environments. Bore diameters (ID) range from 4 mm (0.157 in) to 9 mm (0.354 in); outer diameters (OD) range from 12 mm (0.472 in) to 24 mm (0.945 in); width ranges from 4 mm to 7 mm (0.157–0.276 in). All dimensions conform to ISO 15 standards.
Typical use cases include replacing deep groove ball bearings in brushless DC motors and stepper motors for 3D printers, servicing the wheel axles and pivot points of RC cars and drones, and maintaining the spindle assemblies of small lathes, grinders, and dental handpieces. The 608ZZ variant is also the standard bearing for fidget spinners and inline skate wheels, making this listing a convenient single-source solution for repair shops and hobbyist workshops stocking multiple sizes.
| Series | 604 / 605 / 606 / 607 / 608 / 609 |
|---|---|
| Seal Type | ZZ (metal shield, both sides) / 2RS (rubber seal, both sides) |
| Bore Diameter (ID) | 4 mm / 5 mm / 6 mm / 7 mm / 8 mm / 9 mm (see variant options) |
| Outer Diameter (OD) | 12 mm / 14 mm / 17 mm / 19 mm / 22 mm / 24 mm (see variant options) |
| Width (Thickness) | 4 mm / 5 mm / 6 mm / 7 mm (see variant options) |
| Material | Chrome steel (GCr15) rings & balls; pressed steel or nylon cage |
| Lubrication | Factory-applied grease (ZZ: light oil film; 2RS: grease-packed) |
| Dimensional Standard | ISO 15 |
| Bearing Type | Single-row deep groove ball bearing |
| Operating Temperature | Typically −20 °C to +120 °C (2RS); −20 °C to +150 °C (ZZ) |
| Available Quantities | 1 / 2 / 4 / 10 / 20 / 50 / 100 pcs per order |
| Weight per Piece | See variant options |
ZZ bearings use non-contact metal shields on both sides. They generate less friction and are suited to high-speed, dry, or lightly oiled environments such as electric motors and fans. 2RS bearings use contact rubber seals that physically touch the inner ring, providing a much tighter grease seal and better exclusion of dust and moisture. Choose 2RS for applications exposed to contamination — such as outdoor RC vehicles, conveyor systems, or food-processing equipment — and ZZ where minimizing drag at high RPM is the priority.
Measure three dimensions on the bearing you are replacing: bore diameter (ID — the inner hole), outer diameter (OD), and width (thickness). Match these to the variant table: for example, 608ZZ has ID 8 mm, OD 22 mm, width 7 mm. If the original bearing has a part number stamped on it, the digits after the series prefix indicate the bore size (e.g., "8" in 608 = 8 mm bore). A digital caliper accurate to 0.01 mm is the most reliable measurement tool.
Standard chrome steel (GCr15) bearings offer moderate corrosion resistance when sealed with grease, but are not designed for prolonged immersion or salt-spray exposure. For wet or outdoor applications, the 2RS variant provides better protection by sealing grease in and moisture out. If your application involves frequent water contact, consider adding a compatible bearing grease after installation or contact us to confirm suitability for your specific environment.
Yes. All bearings in this listing conform to ISO 15 dimensional standards, which means the ID, OD, and width are interchangeable with 604–609 series bearings from any ISO-compliant manufacturer — including SKF, NSK, FAG, NTN, and others. The only variable is internal clearance (C2/CN/C3) and precision grade; these bearings are supplied in standard CN clearance and ABEC-3 equivalent tolerance, which suits the vast majority of general-purpose applications.
For a single repair, the 1-piece or 2-piece option gives you a spare without over-committing. If you are servicing a machine with multiple bearing points (e.g., a motor with two end-shield bearings), order at least 2 of the same size. For workshop stock or small-batch production, the 10-, 20-, or 50-piece tiers offer a lower per-unit cost and reduce reorder frequency. The 100-piece tier is suited to production lines or distributors requiring consistent supply.
No additional lubrication is required before installation. ZZ bearings contain a light oil film applied at the factory; 2RS bearings are grease-packed and sealed. Avoid washing or re-greasing ZZ bearings before fitting, as this can introduce contaminants. For 2RS bearings in high-load or high-temperature applications, you may choose to supplement with a compatible lithium-based grease after removing one seal, but this is not necessary for standard use.
Maximum speed depends on the series and seal type. As a general guide for this size range: ZZ variants typically support 20,000–40,000 RPM (grease) depending on bore size, with smaller bores supporting higher speeds. 2RS variants run at roughly 60–70% of the ZZ speed limit due to seal contact friction. For example, a 608ZZ is commonly rated to approximately 32,000 RPM (grease lubrication). Contact us to confirm speed ratings for your specific variant if your application operates near these limits.
