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When a rotating shaft needs to transfer axial loads without wobble or premature wear, the wrong bearing choice costs time and money. Engineers, machinists, and serious DIYers working on lathes, jacks, rotary tables, and vertical shaft assemblies need an axial ball thrust bearing they can size precisely and trust under load. These 51100–51418 axial ball thrust bearings are designed for exactly that scenario.
Each axial ball thrust bearing in this series is a 3-part assembly consisting of a shaft washer, a housing washer, and a ball-and-cage assembly. The series spans inner diameters from 10 mm (0.39 in) to 90 mm (3.54 in) and outer diameters from 24 mm (0.94 in) to 190 mm (7.48 in), with widths ranging from 9 mm (0.35 in) to 77 mm (3.03 in). Available in packs of 1, 2, or 5 pieces to match your project quantity.
Typical use cases include vertical shaft support in hydraulic jacks and screw presses, axial load management in rotary table and indexing head assemblies, and thrust load isolation in lathe tailstock and milling machine spindle setups — all applications where a compact, single-direction axial ball thrust bearing delivers measurable performance advantages over plain washers or radial bearings.
| Bearing Series | 51100, 51200, 51300, 51400 (51100–51418) |
|---|---|
| Design Type | Single-direction axial ball thrust bearing, 3-part |
| Inner Diameter (d) | 10 mm – 90 mm (0.39 in – 3.54 in) |
| Outer Diameter (D) | 24 mm – 190 mm (0.94 in – 7.48 in) |
| Width / Height (H) | 9 mm – 77 mm (0.35 in – 3.03 in) |
| Number of Parts | 3 (shaft washer + housing washer + ball-and-cage assembly) |
| Material | Hardened bearing steel (raceways and balls) |
| Cage Material | See variant options |
| Load Direction | Axial (single direction) |
| Speed Rating | Low-to-moderate speed applications |
| Lubrication | Grease or oil; not pre-lubricated — apply before installation |
| Dimensional Standard | ISO 355 / DIN 711 |
| Available Pack Sizes | 1 pc, 2 pcs, 5 pcs |
| Exact Size per Variant | See variant options (Choose Size dropdown) |
Match the bearing's inner diameter (d) to your shaft diameter and the outer diameter (D) to your housing bore. The size designation in the variant name follows the format: series number + inner diameter × outer diameter × width (all in mm). For example, "51108 40×60×13 mm" has a 40 mm bore, 60 mm OD, and 13 mm height. Always verify both shaft and housing dimensions before ordering.
Within the 51100–51418 family, the sub-series indicates the bearing's width-to-bore ratio. The 511xx series is the lightest (narrowest) for a given bore, while the 512xx, 513xx, and 514xx series progressively increase in width and load capacity for the same shaft diameter. Choose a wider series when your application involves higher axial loads or when additional rigidity is required.
No. Single-direction axial ball thrust bearings are designed exclusively for axial (thrust) loads along the shaft axis. They cannot support radial loads. If your application involves combined radial and axial loading, you will need a separate radial bearing (such as a deep groove ball bearing) to handle the radial component, with the thrust bearing managing only the axial force.
Axial ball thrust bearings in the 511xx–514xx series are rated for low-to-moderate rotational speeds. They are well-suited for applications such as screw jacks, rotary tables, lathe tailstocks, and indexing heads where shaft speeds are typically below 1,000–2,000 RPM depending on size. For high-speed axial load applications, angular contact ball bearings or tapered roller bearings are generally more appropriate.
These bearings are not pre-lubricated. Before installation, apply a suitable bearing grease (such as lithium-based NLGI 2 grease) or oil to the raceways and ball assembly. Proper lubrication is critical for achieving rated service life. Re-lubricate at intervals appropriate to your operating conditions — more frequent lubrication is needed in high-load or contaminated environments.
Both the shaft washer and housing washer feature hardened bearing steel raceways that are ground to tight tolerances to minimize friction and resist surface fatigue. The rolling elements (balls) are also hardened steel. This construction provides the dimensional stability and load-bearing capacity required for sustained axial thrust applications in industrial and workshop environments.
The 3-part assembly consists of: (1) the shaft washer — fits snugly on the rotating shaft; (2) the ball-and-cage assembly — sits between the two washers; (3) the housing washer — rests in the stationary housing seat. Ensure the shaft washer rotates with the shaft and the housing washer remains stationary. Do not reverse the washers. Apply lubricant before assembly, and ensure the bearing seats squarely without cocking. Axial preload should be applied only along the shaft axis.
