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When standard carbon-steel bearings corrode, seize, or contaminate a process, engineers and DIY builders turn to stainless steel deep groove ball bearings. Whether you are maintaining food-processing equipment, marine hardware, pumps, or outdoor power tools, the S6300–S6312 series gives you a direct drop-in replacement that resists rust, moisture, and mild chemical exposure without sacrificing rotational precision.
These stainless steel deep groove ball bearings are available in two material grades — 304 and 440 stainless steel — and two seal configurations: ZZ (double metal shields) and 2RS (double rubber contact seals). Bore diameters run from 10 mm (0.39 in) to 60 mm (2.36 in), with outer diameters from 35 mm (1.38 in) to 130 mm (5.12 in) and widths from 11 mm (0.43 in) to 31 mm (1.22 in), covering the full S6300-to-S6312 range in a single listing.
Typical use cases include corrosion-resistant bearing replacement in marine shaft assemblies, stainless conveyor rollers in food-grade lines, pump impeller support in water-treatment systems, and precision spindle support in laboratory or medical equipment where carbon-steel contamination is unacceptable.
304 grade offers broad corrosion resistance for general wet and mildly acidic environments. 440 grade adds higher hardness (typically HRC 58–62) and improved resistance to chloride-bearing media, making it the preferred choice for marine and food-processing applications.
ZZ (metal shields) allow higher operating speeds and suit dry or lightly lubricated environments. 2RS (rubber contact seals) provide superior exclusion of water, dust, and particulates, making them the right choice for washdown or outdoor exposure.
Bore diameters from 10 mm to 60 mm in a single listing. Select the exact model — S6300, S6301, S6302, S6303, S6304, S6305, S6306, S6307, S6308, S6309, S6310, S6311, or S6312 — to match your shaft without modification.
The deep groove profile handles both radial and moderate axial loads in either direction, eliminating the need for separate thrust bearings in most light-to-medium duty assemblies.
Outer dimensions conform to ISO 15:2017 standards for 6300-series bearings. No housing modification required when replacing a standard carbon-steel 6300-series bearing with this stainless equivalent.
Suited for pumps, fans, conveyors, marine hardware, food-processing machinery, medical devices, laboratory instruments, and general industrial equipment where moisture or chemical exposure rules out standard steel bearings.
| Series | S6300 / S6301 / S6302 / S6303 / S6304 / S6305 / S6306 / S6307 / S6308 / S6309 / S6310 / S6311 / S6312 |
|---|---|
| Seal Type | ZZ (double metal shields) or 2RS (double rubber contact seals) — see variant options |
| Material Grade | 304 Stainless Steel or 440 Stainless Steel — see variant options |
| Bore Diameter (d) | 10 mm – 60 mm (0.39 in – 2.36 in) — see variant options |
| Outer Diameter (D) | 35 mm – 130 mm (1.38 in – 5.12 in) — see variant options |
| Width (B) | 11 mm – 31 mm (0.43 in – 1.22 in) — see variant options |
| Bearing Type | Deep Groove Ball Bearing |
| Row Configuration | Single Row |
| Load Direction | Radial + moderate axial (both directions) |
| Lubrication | Grease-lubricated (factory-filled, sealed) |
| Operating Temperature | ZZ: typically −20 °C to +120 °C; 2RS: typically −20 °C to +100 °C |
| Dimensional Standard | ISO 15:2017 (6300 series) |
| Quantity per Order | 1 piece |
304 stainless steel offers good general corrosion resistance and is suitable for most wet, mildly acidic, or humid environments. 440 stainless steel is a martensitic grade that can be hardened to HRC 58–62, giving it higher load capacity and better resistance to chloride-containing media such as seawater or brine. For marine, food-processing, or high-load applications, 440 is typically the stronger choice. For general industrial or laboratory use where extreme hardness is not required, 304 is sufficient and more cost-effective.
ZZ bearings use non-contact metal shields on both sides. They allow slightly higher maximum speeds and are better suited for dry or lightly lubricated environments where contamination is minimal. 2RS bearings use rubber contact seals that physically touch the inner ring, providing a much tighter barrier against water, dust, and particulates. Choose 2RS for washdown environments, outdoor exposure, or anywhere liquid or fine debris could enter the bearing cavity.
Match the three dimensions shown in the model name: bore diameter (d), outer diameter (D), and width (B). For example, S6304-ZZ corresponds to d=20 mm, D=52 mm, B=15 mm. Measure your existing bearing or check your equipment's engineering drawing. Then select the matching model from the variant dropdown, choose your preferred material grade (304 or 440), and your seal type (ZZ or 2RS).
Yes. The S6300-series stainless steel bearings follow ISO 15:2017 dimensional standards for the 6300 series, so outer dimensions are identical to standard carbon-steel 6300-series bearings. You can replace a standard 6300-series bearing with the corresponding S6300-series stainless bearing without modifying the housing or shaft.
Deep groove ball bearings can accommodate moderate axial loads in both directions in addition to their primary radial load capacity. They are not designed for heavy or purely axial loading — for those applications, angular contact or thrust bearings are more appropriate. For light-to-medium combined radial and axial loads typical of fans, pumps, and conveyors, the S6300-series is well suited.
Yes, these bearings are factory-filled with grease and sealed on both sides. The ZZ metal shields are non-contact and can be carefully removed for re-lubrication if needed. The 2RS rubber seals are contact-type and are generally considered maintenance-free for their service life; re-lubrication is possible but requires careful seal removal. For most applications, the factory grease fill is sufficient for the bearing's rated service life under normal operating conditions.
While stainless steel offers significantly better corrosion resistance than standard carbon steel, it is not suitable for highly concentrated acids, strong oxidizing agents, or environments with prolonged exposure to chlorine at elevated temperatures. For extreme chemical environments, ceramic or PTFE-coated bearings may be more appropriate. If you are unsure whether these bearings suit your specific chemical environment, contact us to confirm before ordering.
