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When a rotating shaft must carry pure axial (thrust) loads without radial interference, the wrong bearing choice leads to premature wear, shaft migration, and costly downtime. Single-direction axial thrust ball bearings in the 511xx series are the go-to solution for engineers, maintenance technicians, and precision-equipment builders who need a dedicated thrust element that stays in place under load.
This listing covers eight models — 51108 through 51115 — spanning inner diameters from 40 mm (1.57 in) to 75 mm (2.95 in), outer diameters from 60 mm (2.36 in) to 100 mm (3.94 in), and heights from 13 mm (0.51 in) to 18 mm (0.71 in). Each bearing consists of a shaft washer, a housing washer, and a steel ball-and-cage assembly, all manufactured to standard dimensional tolerances for drop-in interchangeability.
Typical applications include vertical pump thrust faces, hydraulic press platens, rotary indexing tables, machine-tool spindle preload assemblies, and automotive steering columns — anywhere a clean, one-directional axial thrust ball bearing is required to manage unidirectional axial forces with minimal friction.
🎯 Pure Axial Load Design
Single-direction configuration transmits thrust in one axial direction only, eliminating radial load interference and allowing precise force routing in press, pump, and spindle assemblies.
📐 Eight Size Options (51108–51115)
ID range 40–75 mm, OD range 60–100 mm, height 13–18 mm. Standardized 511xx dimensions ensure interchangeability with OEM and aftermarket seats without custom machining.
🔄 Three-Piece Washer-and-Cage Assembly
Shaft washer, housing washer, and ball-and-cage retainer are matched as a unit, maintaining correct ball complement and even load distribution across the raceway.
🛡️ Hardened Raceway Surfaces
Through-hardened steel washers provide wear resistance under sustained axial loading, extending service intervals in continuous-duty applications such as rotary tables and indexing fixtures.
📦 Flexible Pack Quantities
Available in 1, 2, 5, or 10-piece packs — order a single bearing for a repair job or stock a multi-pack for production-line maintenance without overpaying for excess inventory.
🔁 Drop-In Interchangeability
Dimensions conform to ISO/DIN 511xx standards, making these bearings direct replacements for equivalent-model bearings from other manufacturers with no seat modification required.
| Bearing Series | 511xx (Single-Direction Thrust) |
|---|---|
| Models Covered | 51108, 51109, 51110, 51111, 51112, 51113, 51114, 51115 |
| Inner Diameter (ID) Range | 40 mm – 75 mm (1.57 in – 2.95 in) |
| Outer Diameter (OD) Range | 60 mm – 100 mm (2.36 in – 3.94 in) |
| Height (Thickness) Range | 13 mm – 18 mm (0.51 in – 0.71 in) |
| Load Direction | Single-direction axial (thrust) only |
| Assembly Type | Three-piece: shaft washer + housing washer + ball-cage assembly |
| Material | Hardened bearing steel |
| Dimensional Standard | ISO / DIN 511xx series |
| Available Quantities | 1, 2, 5, or 10 pieces per order |
| Lubrication | See variant options |
| Dynamic Load Rating | See variant options |
| Static Load Rating | See variant options |
| Max Operating Speed | Contact us to confirm |
Match the model to your shaft diameter: 51108 fits a 40 mm shaft, 51109 fits 45 mm, 51110 fits 50 mm, 51111 fits 55 mm, 51112 fits 60 mm, 51113 fits 65 mm, 51114 fits 70 mm, and 51115 fits 75 mm. Confirm the housing bore matches the listed OD and that the available height (thickness) fits your assembly stack-up before ordering.
No. Single-direction thrust ball bearings are designed exclusively for axial (thrust) loads in one direction. They are not suitable for combined radial and axial loading. If your application involves radial forces, a deep-groove or angular-contact ball bearing would be the appropriate choice.
The shaft washer (inner ring) rotates with the shaft, while the housing washer (outer ring) remains stationary in the housing bore. The ball-and-cage assembly sits between them and transmits the axial load. Correct orientation — shaft washer against the rotating component — is essential for proper function and bearing life.
Standard 511xx thrust ball bearings use hardened carbon-steel washers, which are not inherently corrosion-resistant. For wet, humid, or chemically exposed environments, apply a compatible grease or oil film and consider regreasing intervals. If continuous moisture exposure is expected, contact us to discuss stainless-steel or coated alternatives.
These bearings are supplied without pre-applied grease so that you can select the lubricant best suited to your operating temperature, speed, and load conditions. Apply a lithium-based or EP grease to the raceways and ball complement before installation. Relubricate at intervals appropriate to your duty cycle.
No. A single-direction thrust ball bearing handles axial load in one direction only. For bidirectional axial loading, you would need to mount two single-direction bearings back-to-back (face-to-face) or select a double-direction thrust ball bearing (513xx series). Contact us if you need guidance on the correct configuration for your assembly.
For planned maintenance on multiple machines, the 5-pack or 10-pack options offer a lower per-unit cost and ensure you have spares on hand to minimize downtime. For a single repair or prototype build, the 1-piece or 2-piece options let you validate fit and function before committing to larger quantities.
