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When standard ball bearings fail in wet, chemically exposed, or misalignment-prone environments, engineers and maintenance professionals turn to stainless steel spherical plain ball bearings. The S1200–S1209 series is engineered for applications where bore accuracy, angular compensation, and long-term corrosion resistance are non-negotiable.
Each stainless steel spherical plain ball bearing in this series features an inner ring with a spherical convex outer surface mated to a concave outer ring raceway, enabling angular misalignment compensation. Available in 440 Stainless Steel and 304 Stainless Steel, with bore diameters spanning 10 mm (0.394 in) to 45 mm (1.772 in) and outer diameters from 30 mm (1.181 in) to 85 mm (3.346 in). Width ranges from 9 mm to 19 mm depending on the selected size.
Typical use cases include food processing conveyor shafts requiring washdown-safe bearings, marine deck hardware subject to saltwater spray, agricultural equipment pivot points exposed to mud and moisture, and light industrial linkage assemblies where shaft deflection is unavoidable.
| Bearing Series | S1200 – S1209 |
|---|---|
| Bore Diameter (d) | 10 mm – 45 mm (0.394 in – 1.772 in) |
| Outer Diameter (D) | 30 mm – 85 mm (1.181 in – 3.346 in) |
| Width (B) | 9 mm – 19 mm (0.354 in – 0.748 in) |
| Material Options | 440 Stainless Steel / 304 Stainless Steel |
| Bearing Type | Spherical Plain Ball Bearing (Self-Aligning) |
| Lubrication | See variant options |
| Dynamic Load Rating (C) | See variant options |
| Static Load Rating (C₀) | See variant options |
| Operating Temperature | Typically −20°C to +120°C (−4°F to +248°F) |
| Quantity per Order | 1 pcs (per variant selected) |
440 stainless steel is a martensitic grade that can be hardened to achieve higher surface hardness and load-carrying capacity, making it the preferred choice for applications with significant radial or axial loads. 304 stainless steel is an austenitic grade with superior corrosion resistance, particularly in chloride-containing environments such as marine, food processing, or chemical handling applications. If load capacity is the priority, choose 440; if corrosion resistance in aggressive media is the priority, choose 304.
Match the bearing bore diameter to your shaft diameter. The S1200–S1209 series covers bore sizes from 10 mm to 45 mm in standard increments. For a proper fit, the shaft should fall within the bearing's recommended tolerance band (typically h6 or js6 for rotating inner ring applications). Measure your shaft with a micrometer and select the corresponding S-series designation: for example, a 20 mm shaft takes an S1204 (20×47×14 mm).
Yes. The spherical plain design allows the inner ring to tilt relative to the outer ring, compensating for angular misalignment. The typical self-aligning range for this bearing type is ±2° to ±4° depending on the specific size and load conditions. This makes them suitable for pivot points, linkage assemblies, and installations where shaft deflection or housing misalignment cannot be fully eliminated during assembly.
Stainless steel construction makes these bearings significantly more resistant to moisture and mild cleaning agents than carbon steel alternatives. For food processing applications, the 304 stainless steel variant is generally preferred due to its better resistance to the acidic and chloride-containing cleaning solutions commonly used in food plants. Always verify that the lubrication used is food-grade if direct or incidental food contact is possible.
These bearings are designed to fit standard spherical plain bearing housings and pillow block units that accept the corresponding outer diameter. For example, the S1204 (20×47×14 mm) fits housings bored to 47 mm with the appropriate tolerance. Always confirm the housing bore diameter, width, and any snap ring groove requirements against the specific bearing dimensions listed in the variant options before ordering.
Spherical plain ball bearings in this series are typically supplied without pre-packed grease unless otherwise specified. Apply a suitable grease (lithium-based or synthetic, depending on operating temperature and environment) during installation. In wet or washdown environments, use a water-resistant grease and establish a relubrication interval based on operating hours and conditions. Inspect periodically for wear on the spherical contact surfaces, as these bearings do not have rolling elements and rely on sliding contact between the inner and outer rings.
Choose a spherical plain bearing when your application involves oscillating or slow rotational movement, angular misalignment between shaft and housing, or combined radial and axial loads in a compact envelope. Standard deep groove ball bearings are optimized for continuous rotation with minimal misalignment. If your shaft deflects, pivots, or rocks rather than spinning continuously at speed, a spherical plain bearing is the more appropriate selection.
