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When a worn or undersized bearing causes wobble, noise, or premature failure in your equipment, finding the exact replacement quickly matters. Engineers, hobbyists, and maintenance technicians who need reliable deep groove ball bearings with double metal shielding will find this range covers bore sizes from 2 mm (0.08 in) up to 30 mm (1.18 in), with outer diameters reaching 37 mm (1.46 in).
Each deep groove ball bearing in this listing features a steel inner ring, steel outer ring, and a full complement of precision steel balls retained in a pressed-steel cage. The ZZ designation indicates two metal shields — one on each side — that keep grease in and contaminants out without the added drag of rubber contact seals. Bore sizes span 2–30 mm and outer diameters 5–37 mm, with widths from 2.5 to 10 mm.
Typical use cases include DC motor shaft support in power tools and appliances, inline skate and skateboard wheel axles, RC car and drone drivetrain assemblies, small conveyor idler rollers, and 3D printer carriage and extruder mechanisms — all applications where a compact, low-friction ZZ shielded bearing reduces maintenance intervals and keeps rotating assemblies running true.
🛡️ Double Metal (ZZ) Shielding
Two pressed-steel shields on both sides retain factory-applied grease and block dust, metal chips, and light moisture ingress — extending service life in dirty or dry environments without contact-seal drag.
📐 Wide Size Selection
50 bearing sizes available in a single listing, covering bore diameters from 2 mm to 30 mm and outer diameters from 5 mm to 37 mm, so you can source multiple sizes in one order.
🔩 Steel Inner and Outer Rings
Hardened steel raceways provide the load capacity and dimensional stability needed for continuous rotation in motors, wheels, and precision mechanisms.
⚡ Low-Friction Running
The non-contact metal shield design produces lower starting and running torque compared to rubber-sealed equivalents, making these bearings well-suited for high-speed, low-load applications.
📦 Flexible Pack Quantities
Available in Pack of 1, 2, 4, or 10 per bearing size — order a single replacement or stock up for production runs and repair kits at a lower per-unit cost.
🔄 Standard Metric Dimensions
Dimensions conform to standard metric bearing series (6xx, 6x0x, 6xx series), making these direct drop-in replacements for OEM bearings of the same designation.
| Bearing Type | Deep Groove Ball Bearing |
|---|---|
| Shield Type | Double Metal Shield (ZZ) |
| Material | Steel (rings, balls, shields) |
| Bore Diameter (ID) | 2 mm – 30 mm (0.08 in – 1.18 in) |
| Outer Diameter (OD) | 5 mm – 37 mm (0.20 in – 1.46 in) |
| Width (Thickness) | 2.5 mm – 10 mm (0.10 in – 0.39 in) |
| Available Sizes | See variant options |
| Pack Quantities | Pack of 1 / 2 / 4 / 10 |
| Lubrication | Grease-filled (factory pre-lubricated) |
| Operating Temperature | See variant options |
| Radial Load Capacity | See variant options |
| Bearing Series | 6xx / 6x0x / 6xxx metric series |
Measure the shaft diameter (bore/ID), the housing bore (OD), and the available axial space (width) using calipers. Match those three dimensions to the ID × OD × Thickness listed in the variant options. If the original bearing has a part number stamped on it (e.g., 625, 6200), you can also match by bearing designation directly.
ZZ indicates two non-contact metal shields, one on each side of the bearing. The shields retain the factory grease and prevent coarse contaminants from entering the raceway. Unlike rubber contact seals (2RS), metal shields do not touch the inner ring, so they produce less friction and are better suited for higher-speed applications.
The metal shields can be carefully pried off with a thin tool, allowing you to clean and re-grease the bearing. However, re-seating the shields without distortion requires care. For most applications, replacing a worn bearing is more practical than re-lubricating, especially given the low per-unit cost at higher pack quantities.
ZZ metal shields provide basic splash and dust protection but are not waterproof. For continuous water exposure or outdoor environments with rain and humidity, a rubber-sealed bearing (2RS designation) offers better ingress protection. These ZZ bearings are best suited for dry to lightly contaminated indoor environments.
Inline skate and skateboard wheels most commonly use the 608 bearing (8 × 22 × 7 mm). RC cars vary by model — common sizes include 625 (5 × 16 × 5 mm), 626 (6 × 19 × 6 mm), and 688 (8 × 16 × 5 mm). Check your wheel or drivetrain documentation for the exact designation before ordering.
Most rotating assemblies use bearings in pairs (one at each end of a shaft), so Pack of 2 covers a single shaft replacement. Pack of 4 suits a four-wheel vehicle or a two-shaft assembly. Pack of 10 is cost-effective for production builds, repair stock, or hobbyist projects where you anticipate multiple replacements over time.
The 6xx series (e.g., 625, 626, 608) are standard miniature and small deep groove bearings with relatively compact cross-sections. The 6x0x series (e.g., 6200, 6201) are the standard light series with slightly larger OD and width for a given bore, offering higher load ratings. The 6700 series (e.g., 6700, 6701) are thin-section bearings with a large OD relative to bore, used where radial space is limited. Select based on your housing and shaft dimensions.
