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When a worn or undersized bearing causes wobble, noise, or premature failure in your build, finding an exact-fit replacement matters. Engineers, hobbyists, and repair technicians working on compact rotating assemblies need stainless steel deep groove ball bearings that deliver consistent radial load capacity in tight spaces — without corroding under moisture or light chemical exposure.
These 625–628 series deep groove ball bearings are constructed from stainless steel throughout the inner ring, outer ring, and ball complement, with a retainer cage for even ball spacing. Bore diameters range from 5 mm (0.197 in) to 8 mm (0.315 in), and outer diameters span 16 mm (0.630 in) to 24 mm (0.945 in), with widths of 5 mm to 8 mm depending on the selected size.
Typical applications include RC car and drone motor shafts, 3D printer carriage and extruder assemblies, small power tool spindles, inline skate wheel axles, and light industrial conveyor rollers — anywhere a compact stainless steel deep groove ball bearing with low running noise is required.
| Bearing Series | 625 / 626 / 627 / 628 |
|---|---|
| Bore Diameter (d) | 5 mm / 6 mm / 7 mm / 8 mm |
| Outer Diameter (D) | 16 mm / 19 mm / 22 mm / 24 mm |
| Width (B) | 5 mm / 6 mm / 7 mm / 8 mm |
| Material | Stainless Steel (rings & balls) |
| Bearing Type | Deep Groove Ball Bearing |
| Load Direction | Radial + Moderate Axial (both directions) |
| Seal / Shield | See variant options |
| Lubrication | See variant options |
| Dynamic Load Rating (C) | See variant options |
| Static Load Rating (C₀) | See variant options |
| Max Speed | See variant options |
| Dimension Standard | ISO 15 / DIN 625 |
| Unit Sold | 1 piece per unit |
Match the bearing to your shaft diameter: 625 fits a 5 mm shaft, 626 fits 6 mm, 627 fits 7 mm, and 628 fits 8 mm. Also confirm the outer diameter fits your housing bore and that the width clears any retaining features. Measure your existing bearing or housing with calipers before ordering.
Yes. Deep groove ball bearings in the 625–628 series are widely used in RC vehicles, brushless motors, and drone frames. They handle the radial loads generated by spinning shafts and moderate axial thrust from propeller or gear reaction forces. For high-RPM drone applications, verify the speed rating matches your motor's operating RPM.
Stainless steel offers significantly better corrosion resistance than standard carbon steel bearings. These are suitable for damp environments, occasional water splash, and light chemical exposure. For continuous immersion or aggressive chemical environments, consult a bearing specialist for ceramic or fully sealed options.
The 625 (5×16×5 mm) is one of the most common bearings used in 3D printer extruder idlers and carriage wheels. The 626 and 627 sizes are also used in various printer frame and motion system designs. Check your printer's BOM or existing bearing markings to confirm the exact size needed.
Open bearings have no cover over the raceway — they run with lower friction but require external lubrication and are exposed to contamination. Shielded bearings (suffix Z or ZZ) have metal shields that block debris. Sealed bearings (suffix RS or 2RS) use rubber contact seals for better contamination exclusion and are pre-lubricated. Check the variant options or contact us to confirm the seal type available.
Standard inline skate wheels use 608-size bearings (8×22×7 mm), which is a different series. However, some specialty skate frames and custom builds use 627 or 628 sizes. Measure your axle diameter and wheel hub bore carefully before purchasing to confirm fitment.
Each unit in this listing is one (1) bearing. Select the quantity you need using the QTY selector above. Ordering the exact count you need helps avoid excess stock on small repair or prototype jobs.
