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When a seized bearing brings your RC car, 3D printer, or precision instrument to a halt, the wrong replacement only makes things worse. Engineers, makers, and repair technicians who work with compact rotating assemblies need bearings that fit exactly, run quietly, and resist corrosion without constant maintenance. These miniature stainless steel deep groove ball bearings are built for exactly those demands.
Each bearing features a full complement of stainless steel balls housed in a stainless steel inner and outer ring, with double metal shields (ZZ) to keep contaminants out. Available in two material grades — 304 stainless for general corrosion resistance and 440 stainless for higher hardness and wear resistance — with inner diameters ranging from 2mm (0.079 in) to 35mm (1.378 in) and outer diameters from 5mm (0.197 in) to 80mm (3.150 in). Widths span 2.5mm (0.098 in) to 21mm (0.827 in) depending on the model selected.
Typical applications include miniature motor shafts in RC vehicles and drones, linear guide carriages in desktop CNC machines and 3D printers, spindle assemblies in small power tools, and pivot points in medical or laboratory instruments where stainless construction is required for hygiene or chemical resistance.
| Bearing Type | Deep Groove Ball Bearing, Double Metal Shield (ZZ) |
|---|---|
| Material Grade Options | 304 Stainless Steel / 440 Stainless Steel |
| Inner Diameter (d) | 2mm – 35mm (0.079 in – 1.378 in); see variant options |
| Outer Diameter (D) | 5mm – 80mm (0.197 in – 3.150 in); see variant options |
| Width (B) | 2.5mm – 21mm (0.098 in – 0.827 in); see variant options |
| Shield Type | ZZ (double pressed-steel shield, non-contact) |
| Lubrication | Factory-greased; suitable for dry or lightly lubricated use |
| Load Direction | Radial (primary); moderate bidirectional axial |
| Operating Temperature | See variant options |
| Quantity per Order | 1 piece (select quantity in cart for multiples) |
| Series Included | SMR, S6xx, S62xx, S63xx, S68xx, S69xx, S618xx, S619xx |
Match the inner diameter (d) to your shaft diameter and the outer diameter (D) to your housing bore. The width (B) must also fit within your housing depth. Each variant lists dimensions in the format d*D*B (e.g., S6200-ZZ = 10*30*9mm means 10mm bore, 30mm OD, 9mm wide). Measure your existing bearing or housing with calipers before ordering.
304 stainless steel offers excellent corrosion resistance and is suitable for most general-purpose applications involving moisture or mild chemicals. 440 stainless steel is a martensitic grade that can be hardened to a higher Rockwell hardness (typically HRC 58–62), making it better suited for applications with higher loads, abrasion, or where wear resistance is the priority. 440 is also magnetic after hardening, while 304 is generally non-magnetic.
These are ZZ-shielded bearings, meaning they have pressed-steel shields on both sides. Shields are non-contact (they do not touch the inner ring), which results in lower friction and higher speed capability compared to rubber-sealed (2RS) bearings. However, shields provide less contamination protection than rubber seals. They are well-suited for clean or moderately dusty environments but are not recommended for direct water immersion.
Deep groove ball bearings can handle moderate axial loads in both directions in addition to their primary radial load capacity. They are not designed for heavy pure-thrust applications — for those, angular contact or thrust bearings are more appropriate. For typical motor shafts, spindles, and pivot assemblies, the axial capacity of these bearings is generally sufficient.
Yes. All dimensions follow standard metric deep groove ball bearing profiles (ISO 15 / JIS B 1521 equivalent series). If your housing or shaft was designed for a standard metric bearing of the same model number (e.g., 6200, 6201, 608, etc.), these stainless variants are direct drop-in replacements. Always verify the d, D, and B dimensions match your application.
These bearings are widely used in RC cars, drones, and aircraft; 3D printers and desktop CNC machines; small electric motors and servo mechanisms; inline skates and skateboard wheels; laboratory and medical instruments; camera gimbals and stabilizers; and general precision mechanical assemblies where compact size and corrosion resistance are required.
These bearings come factory-greased and are ready to install. For most applications, no additional lubrication is needed at installation. If your application involves high speeds or elevated temperatures, you may wish to add a small amount of compatible bearing grease. Avoid over-greasing, as excess lubricant can increase drag and heat generation.
