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When a seized or noisy bearing brings your motor, spindle, or RC drivetrain to a halt, finding the exact replacement size quickly is critical. Whether you are a robotics engineer, a 3D-printer builder, or a hobbyist repairing power tools, these deep groove ball bearings give you a reliable, drop-in solution across a wide range of bore sizes without the lead time of industrial suppliers.
This listing covers the 60x, 62x, 63x, 68x, 69x, and 670x series ZZ (double-shielded) deep groove ball bearings. Inner diameters range from 3 mm (0.12 in) to 35 mm (1.38 in), outer diameters from 7 mm (0.28 in) to 44 mm (1.73 in), and widths from 3 mm (0.12 in) to 9 mm (0.35 in). The steel shields on both faces keep grease in and contaminants out, making them suitable for moderate-speed, lightly loaded applications. Available in quantities of 1, 3, 5, 10, or 50 pieces with tiered pricing.
Typical use cases include replacing worn bearings in brushless motors and BLDC spindles, supporting shafts in CNC router Z-axis assemblies, fitting into skateboard and inline-skate wheel hubs, and serving as pivot bearings in RC car differentials and drone motor mounts — all scenarios where a compact, low-friction deep groove ball bearing for motor applications is essential.
| Series Covered | 60x, 62x, 63x, 68x, 69x, 670x (ZZ double-shielded) |
|---|---|
| Models Available | 604ZZ, 605ZZ, 606ZZ, 607ZZ, 608ZZ, 609ZZ, 623ZZ, 624ZZ, 625ZZ, 626ZZ, 627ZZ, 628ZZ, 629ZZ, 633ZZ, 634ZZ, 635ZZ, 636ZZ, 637ZZ, 638ZZ, 683ZZ, 684ZZ, 685ZZ, 686ZZ, 687ZZ, 688ZZ, 689ZZ, 693ZZ, 694ZZ, 695ZZ, 696ZZ, 697ZZ, 698ZZ, 699ZZ, 6700ZZ, 6701ZZ, 6702ZZ, 6703ZZ, 6704ZZ, 6705ZZ, 6706ZZ, 6707ZZ |
| Inner Diameter (ID) Range | 3 mm – 35 mm (0.12 in – 1.38 in) |
| Outer Diameter (OD) Range | 7 mm – 44 mm (0.28 in – 1.73 in) |
| Width Range | 3 mm – 9 mm (0.12 in – 0.35 in) |
| Shield Type | ZZ — double steel shield, non-contact |
| Bearing Type | Deep groove ball bearing (single row) |
| Lubrication | Factory-greased (sealed behind shields) |
| Material | Chrome steel races and balls; steel shields |
| Load Direction | Radial (primary); light axial loads supported |
| Operating Speed | See variant options |
| Operating Temperature | See variant options |
| Quantity Options | 1 / 3 / 5 / 10 / 50 pcs per order |
| Dimension Format | ID × OD × Width (mm) — listed in variant name |
Check the existing bearing for a stamped model number (e.g., 608ZZ) or measure the inner diameter (ID), outer diameter (OD), and width with calipers. Match those three dimensions to the variant name shown as IDxODxWidth mm. For example, 608ZZ = 8×22×7 mm means an 8 mm shaft bore, 22 mm housing OD, and 7 mm width.
"ZZ" (also written 2Z) indicates double steel shields on both sides of the bearing. This is different from "2RS" or "DDU" which use rubber contact seals. ZZ shields are non-contact, so they produce slightly less friction and are better suited for higher-speed applications, while rubber seals offer better contamination exclusion in dirty environments.
Deep groove ball bearings in the 60x–670x series are designed primarily for radial loads with the ability to handle moderate axial (thrust) loads in both directions. Exact dynamic and static load ratings vary by model size. For light-duty motors, 3D printers, RC vehicles, and hobby machinery, these bearings are well within the required load range. For heavy industrial applications, consult the specific model's datasheet for load ratings.
These are standard chrome steel (GCr15) bearings with steel shields. They are not stainless steel and are not rated for continuous wet or corrosive environments. For occasional exposure to light moisture, the factory grease provides some protection. If your application involves water, chemicals, or outdoor exposure, consider stainless steel (SS) variants or apply additional corrosion protection.
The 608ZZ (8×22×7 mm) is the most widely used bearing in 3D printers (extruder idlers, Z-axis), inline skates, and skateboard wheels. The 625ZZ (5×16×5 mm) and 624ZZ (4×13×5 mm) are common in RC car differentials and small drone motors. The 604ZZ (4×12×4 mm) fits many micro motor shafts. Check your equipment's bearing seat dimensions to confirm the correct fit.
If you are replacing a single bearing and are confident in the size, a single piece (qty 1) is the most economical starting point. For repair kits, workshop stock, or production builds where you need spares on hand, the 5-pack or 10-pack offers a lower per-unit cost. The 50-pack is best suited for small-batch manufacturing or resale. Select your quantity in the Units(pcs) option above.
Yes, all ZZ-shielded bearings in this listing come factory-greased and are ready to install. The steel shields retain the grease inside the bearing. You do not need to add lubricant before use. Avoid washing with solvents that could strip the grease through the shield gaps; if re-lubrication is needed after extended use, apply a small amount of bearing grease to the shield edge.
