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When axial play causes premature wear in your gearbox, rotary table, or hydraulic jack, the root cause is often an undersized or mismatched thrust bearing. Engineers and maintenance technicians who need a reliable single-direction axial load solution will find the 51100–51218 series miniature thrust ball bearing a direct-fit answer: standardized dimensions, steel cage construction, and a flat washer seat that distributes load evenly across the raceway.
Each bearing in this series consists of a shaft washer, a housing washer, and a ball-and-cage assembly. The bore (inner diameter) spans 10 mm to 110 mm (approx. 0.39" to 4.33"), outer diameters range from 24 mm to 160 mm (approx. 0.94" to 6.30"), and heights from 9 mm to 40 mm (approx. 0.35" to 1.57"). All critical dimensions conform to ISO 104 / DIN 711 standards, ensuring interchangeability with OEM and aftermarket components.
Typical applications include vertical shaft assemblies in machine tools, worm gear reducers where axial thrust must be isolated from radial loads, automotive steering columns, and laboratory rotary stages requiring low-friction axial positioning. The flat-washer design also makes these miniature thrust ball bearings a common replacement in bottle-capping machinery and conveyor turntables.
| Bearing Type | Single-Direction Thrust Ball Bearing |
|---|---|
| Series / Model Range | 51100, 51200, 51104, 51204, 51304, 51105, 51205, 51305, 51106, 51206, 51306, 51406, 51107, 51207, 51307, 51108, 51208, 51308, 51408, 51111, 51211, 51311, 51110, 51210, 51310, 51109, 51209, 51309, 51112, 51212, 51312, 51113, 51213, 51313, 51114, 51214, 51314, 51117, 51217, 51120, 51220, 51122, 51222, 51118, 51218 |
| Bore (ID) Range | 10 mm – 110 mm (0.39" – 4.33") |
| Outer Diameter (OD) Range | 24 mm – 160 mm (0.94" – 6.30") |
| Height Range | 9 mm – 40 mm (0.35" – 1.57") |
| Cage Material | Steel |
| Load Direction | Axial (single-direction) |
| Dimensional Standard | ISO 104 / DIN 711 |
| Lubrication | See variant options |
| Dynamic Load Rating (C) | See variant options |
| Static Load Rating (C₀) | See variant options |
| Max Operating Speed | See variant options |
| Operating Temperature Range | Typically −20°C to +120°C (−4°F to +248°F) |
| Quantity per Order | 1 piece |
Match the bore (ID) to your shaft diameter and the outer diameter (OD) to your housing bore. Then confirm the height fits within your axial clearance. Use the Size(ID×OD×Height) option above — for example, 30×52×16 means a 30 mm bore, 52 mm OD, and 16 mm height. Cross-reference the model number (e.g., 51206) with your OEM drawing or bearing catalog to confirm interchangeability.
All four series are single-direction thrust ball bearings sharing the same bore size for a given last two digits (e.g., 04 = 20 mm bore). The series number indicates the cross-section (OD and height): 511xx is the lightest section, 512xx is medium, 513xx is heavier, and 514xx is the heaviest. A larger cross-section provides a higher load rating at the cost of increased envelope size and weight.
No. Thrust ball bearings in the 511xx–514xx series are designed exclusively for axial (thrust) loads in one direction. They cannot support radial loads. If your application involves combined axial and radial loading, pair this bearing with a separate deep-groove or angular-contact ball bearing to handle the radial component.
The standard steel cage and raceway washers offer moderate corrosion resistance suitable for dry or lightly lubricated indoor environments. For wet, washdown, or outdoor applications, apply a compatible grease or oil to the bearing surfaces before installation and re-lubricate at regular service intervals. If your environment requires stainless steel components, contact us to confirm availability for your specific size.
A lithium-based grease (NLGI Grade 2) is suitable for most general-purpose applications. Apply a thin, even film to both washer faces and the ball-and-cage assembly before installation. Re-lubrication interval depends on operating speed, load, and temperature — typically every 500–2,000 operating hours for moderate-duty cycles. Avoid over-greasing, which can cause churning and elevated operating temperatures.
Ensure the shaft washer seats against the rotating component (shaft shoulder) and the housing washer seats against the stationary component (housing face). Never press on the ball-and-cage assembly directly — apply force only to the washer faces. Verify that the shaft and housing seats are flat, clean, and within the recommended tolerance (typically h6 for the shaft, H7 for the housing). Misalignment between shaft and housing axes should not exceed 2–4 arc-minutes for standard series bearings.
Only if the OD and height also match. For example, a 51206 (30×52×16) cannot directly replace a 51306 (30×60×21) even though both have a 30 mm bore, because the OD and height differ. Always verify all three dimensions — ID, OD, and height — against your housing and shaft before substituting model numbers.
