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When a rotating shaft needs to handle axial (thrust) loads without wobble or premature wear, the wrong bearing becomes a costly failure point. Engineers, machinists, and serious DIYers working on pumps, gearboxes, rotary tables, and vertical shaft assemblies need a thrust bearing that holds its geometry under load — and resists corrosion in demanding environments. These stainless steel thrust ball bearings are built for exactly that.
Each bearing in the 51100–51110 series is a three-part assembly: a shaft washer, a housing washer, and a ball-and-cage assembly. Available in 304 Stainless Steel (excellent general corrosion resistance) and 440 Stainless Steel (higher hardness, suitable for moderate corrosive environments). Inner diameter (ID) ranges from 10 mm (0.39 in) to 50 mm (1.97 in); outer diameter (OD) ranges from 24 mm (0.94 in) to 70 mm (2.76 in); thickness ranges from 9 mm (0.35 in) to 14 mm (0.55 in).
Typical use cases include vertical shaft thrust load management in water pumps and centrifugal equipment, rotary table and indexing fixture assemblies requiring low-friction axial support, and light-duty gearbox or motor end-thrust applications where stainless corrosion resistance is required over standard carbon steel bearings.
| Bearing Series | 51100–51110 |
|---|---|
| Bearing Type | Single-Direction Thrust Ball Bearing (Three-Part) |
| Material Options | 304 Stainless Steel / 440 Stainless Steel |
| Inner Diameter (ID) | 10–50 mm (0.39–1.97 in) — See variant options |
| Outer Diameter (OD) | 24–70 mm (0.94–2.76 in) — See variant options |
| Thickness | 9–14 mm (0.35–0.55 in) — See variant options |
| Number of Parts | 3 (shaft washer, housing washer, ball & cage assembly) |
| Load Direction | Axial (Thrust) — single direction |
| Lubrication | See variant options / Contact us to confirm |
| Operating Temperature | See variant options / Contact us to confirm |
| Quantity per Order | 1 piece |
Match the bearing's Inner Diameter (ID) to your shaft diameter. For example, if your shaft is 20 mm, select the S51104 (20×35×10) variant. Then confirm the Outer Diameter (OD) fits within your housing bore. Use the size table in the product description to cross-reference ID, OD, and thickness before ordering.
304 Stainless Steel offers excellent resistance to general corrosion, oxidation, and moisture — ideal for wet environments, food-adjacent applications, or outdoor use. 440 Stainless Steel has higher carbon content, giving it greater surface hardness and wear resistance, making it better suited for applications with moderate corrosion exposure combined with higher contact stress. If in doubt about your environment, 304 is the more broadly corrosion-resistant choice.
No. Single-direction thrust ball bearings are designed exclusively for axial (thrust) loads — forces acting along the shaft axis. They are not rated for radial loads. If your application involves combined axial and radial loads, you will need a different bearing type such as an angular contact or deep groove ball bearing.
Yes. These bearings conform to standard 51100–51110 series dimensional specifications, so they are dimensionally interchangeable with other bearings in this series. Always verify the exact ID, OD, and thickness of your existing bearing or housing drawing before ordering to ensure a correct fit.
Yes, lubrication is recommended for optimal performance and service life. Light machine oil or a compatible grease appropriate for your operating speed and load is typically used. Stainless steel bearings do not come pre-greased unless specified. Contact us to confirm lubrication requirements for your specific variant and application.
These bearings are well suited for vertical shaft assemblies in water pumps, rotary tables, indexing fixtures, light-duty gearbox end-thrust positions, and any application where a rotating component must resist axial force while maintaining low friction. The stainless steel construction makes them particularly appropriate where moisture, mild chemicals, or corrosive atmospheres are present.
A three-part thrust bearing consists of a shaft washer (tight fit on the shaft), a housing washer (loose fit in the housing), and a ball-and-cage assembly between them. The shaft washer rotates with the shaft; the housing washer remains stationary. Ensure the shaft washer bore matches your shaft diameter, apply appropriate lubrication to the raceways, and seat both washers squarely before applying axial preload. Never press on the ball-and-cage assembly directly.
