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When axial play and thrust forces cause premature wear in your rotating equipment, the right bearing makes all the difference. Engineers, maintenance technicians, and DIY builders working on motors, gearboxes, pumps, and machine tool spindles need a thrust bearing that holds its geometry under sustained one-directional axial loads — without constant replacement.
These thrust ball bearings are three-part assemblies consisting of a shaft washer, a housing washer, and a ball-and-cage assembly. Manufactured to standard 511xx and 512xx series dimensions, they cover inner diameters from 10 mm (0.39 in) to 120 mm (4.72 in), outer diameters from 24 mm (0.94 in) to 155 mm (6.10 in), and heights from 9 mm (0.35 in) to 25 mm (0.98 in). Material is typically chrome steel (GCr15) with a black oxide or bright finish depending on variant.
Typical use cases include single-direction thrust ball bearing replacement in electric motor end caps, hydraulic pump shaft supports, rotary table assemblies, and automotive steering column applications — all scenarios where axial load capacity and compact height are critical selection criteria.
Shaft washer, housing washer, and ball-and-cage assembly are fully separable for easy installation, inspection, and replacement without disturbing adjacent components.
Covers 511xx series (10–120 mm ID) and 512xx series (40–75 mm ID) in a single product, so you can match your exact shaft and housing dimensions from one source.
Engineered specifically for unidirectional thrust loads, making them the correct choice for applications where radial loads are carried by a separate bearing.
Typically manufactured from GCr15 chrome steel, providing the hardness and fatigue resistance needed for sustained dynamic and static axial loading in industrial environments.
All sizes conform to ISO/JIS standard 511xx and 512xx series boundary dimensions, ensuring interchangeability with OEM and aftermarket housings worldwide.
Suitable for electric motors, gearboxes, hydraulic pumps, rotary tables, machine tool spindles, and automotive steering columns where controlled axial positioning is required.
| Bearing Type | Single-Direction Thrust Ball Bearing |
|---|---|
| Series | 511xx (51100–51124) and 512xx (51208–51215) |
| Number of Parts | 3 (shaft washer, housing washer, ball & cage assembly) |
| Inner Diameter (ID) Range | 10 mm – 120 mm (0.39 in – 4.72 in) |
| Outer Diameter (OD) Range | 24 mm – 155 mm (0.94 in – 6.10 in) |
| Height Range | 9 mm – 25 mm (0.35 in – 0.98 in) |
| Material | Chrome steel (GCr15), typical |
| Load Direction | Axial (single direction) |
| Dimension Standard | ISO / JIS metric series |
| Lubrication | See variant options |
| Dynamic Load Rating (C) | See variant options |
| Static Load Rating (C₀) | See variant options |
| Quantity per Order | 1 piece per unit |
Match the bearing's Inner Diameter (ID) to your shaft diameter and the Outer Diameter (OD) to your housing bore. The height must fit within your axial clearance envelope. Each variant in this listing is labeled as Series# ID×OD×Height (all in mm) — select the option that matches your measured shaft and housing dimensions exactly.
Both are single-direction thrust ball bearings. The 512xx series (51208–51215) has a larger OD and greater height for the same ID compared to the equivalent 511xx size, providing higher axial load capacity in a wider housing. Choose 512xx when your housing bore is larger or when you need greater load ratings at the same shaft diameter.
No. Thrust ball bearings are designed exclusively for axial (thrust) loads in one direction. They should not be used to carry radial loads. In applications with combined loading, pair this bearing with a separate radial bearing (e.g., deep groove ball bearing) to handle the radial component.
Standard chrome steel (GCr15) offers moderate corrosion resistance suitable for dry or lightly lubricated indoor environments. For wet, humid, or chemically aggressive environments, consider applying a compatible grease or consult us about stainless steel alternatives. Avoid prolonged exposure to water or corrosive media without proper sealing.
These bearings are typically supplied without pre-applied grease. Apply a lithium-based or synthetic grease rated for your operating temperature and speed before installation. For high-speed applications, a light mineral oil may be preferable. Relubricate at intervals appropriate to your duty cycle and environment.
The shaft washer (with the smaller bore) seats against the rotating shaft shoulder; the housing washer (with the larger bore) seats in the stationary housing. Ensure both mating faces are clean, flat, and perpendicular to the shaft axis. Apply axial preload only — never press on the ball-and-cage assembly directly. Misalignment between shaft and housing will significantly reduce bearing life.
Each unit ordered contains one complete three-part thrust ball bearing assembly (shaft washer + housing washer + ball-and-cage). If your application requires multiple bearings, adjust the quantity in your cart accordingly.
