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When your rotating assembly demands precise axial load management in a compact footprint, standard radial bearings fall short. Engineers, hobbyists, and machine builders working on low-speed rotary tables, screw jacks, vertical shafts, and miniature machinery need a dedicated thrust solution that fits tight spaces without sacrificing load capacity. These axial thrust ball bearings are designed for exactly that — delivering controlled, smooth axial force transfer in applications where radial space is limited.
Each bearing follows the classic 3-part construction: a shaft washer (tight-fit ring), a housing washer (loose-fit ring), and a ball-and-cage assembly sandwiched between them. Available in seven standard sizes from the 51100 series (10×24×9mm / 0.39"×0.94"×0.35") through the 51106 series (30×47×11mm / 1.18"×1.85"×0.43"), these bearings cover bore diameters from 10mm to 30mm and outer diameters from 24mm to 47mm, with heights ranging from 9mm to 11mm.
Typical use cases include vertical shaft support in rotary indexing tables, axial load management in worm gear reducers, thrust positioning in small hydraulic or pneumatic cylinders, and preload applications in miniature CNC spindle assemblies — all scenarios where long-tail search terms like "miniature thrust bearing for rotary table" or "51100 series axial ball bearing" describe exactly what builders are sourcing.
Shaft washer, housing washer, and ball-cage assembly are separable for easy installation, inspection, and replacement without disturbing adjacent components.
Bore diameters from 10mm to 30mm (0.39"–1.18") and ODs from 24mm to 47mm (0.94"–1.85") cover a wide range of miniature and light-duty industrial applications.
Engineered specifically for one-directional axial (thrust) loads — ideal for vertical shafts, screw mechanisms, and rotary tables where radial bearings are unsuitable.
Manufactured from bearing-grade steel with standard surface treatment, providing reliable service life in typical indoor mechanical environments.
The retained ball complement minimizes friction and wear during operation, supporting smooth, consistent axial motion at low-to-moderate rotational speeds.
Available in 1, 4, or 10-piece packs — order a single unit for prototyping or stock up in multiples for production runs and maintenance kits.
| Bearing Series | 51100 Series (51100, 51101, 51102, 51103, 51104, 51105, 51106) |
|---|---|
| Bearing Type | Single-Direction Axial Thrust Ball Bearing, 3-Part |
| Bore Diameter (ID) | 10mm – 30mm (0.39" – 1.18") — See variant options |
| Outer Diameter (OD) | 24mm – 47mm (0.94" – 1.85") — See variant options |
| Height (Width) | 9mm – 11mm (0.35" – 0.43") — See variant options |
| Material | Bearing-Grade Steel |
| Load Direction | Axial (Thrust) — One Direction |
| Number of Parts | 3 (Shaft Washer + Housing Washer + Ball & Cage Assembly) |
| Dynamic Load Rating (C) | See variant options |
| Static Load Rating (C₀) | See variant options |
| Max Speed | Contact us to confirm |
| Lubrication | Contact us to confirm |
| Pack Quantity | 1 Pcs / 4 Pcs / 10 Pcs — See variant options |
Match the bearing's bore diameter (ID) to your shaft diameter and the outer diameter (OD) to your housing seat. The 51100 series uses standardized dimensions: for example, the 51100 has a 10mm bore and 24mm OD, while the 51106 has a 30mm bore and 47mm OD. Always verify both ID and OD against your engineering drawings before ordering. Select your size from the dropdown above.
No. Single-direction axial thrust ball bearings are designed exclusively for axial (thrust) loads acting parallel to the shaft axis. They are not suitable for radial loads or combined radial-axial loads. If your application involves both load types, consider a combined angular contact or deep groove ball bearing instead.
The shaft washer (tight-fit ring) has a bore that fits snugly onto the rotating shaft. The housing washer (loose-fit ring) sits in the stationary housing with a slight clearance fit. The ball-and-cage assembly runs between them. Correct identification and installation of each washer is critical — reversing them will cause premature failure.
These bearings are manufactured from standard bearing-grade steel with conventional surface treatment, suitable for typical indoor mechanical environments. They are not rated for continuous exposure to moisture, chemicals, or outdoor conditions. For wet or corrosive environments, consider stainless steel thrust bearings or apply appropriate lubrication and sealing measures.
Axial thrust ball bearings in this series are typically supplied without pre-applied grease. Apply a light bearing grease (e.g., NLGI Grade 2 lithium-based grease) to the ball-and-cage assembly and both washer contact faces before installation. Re-lubrication intervals depend on operating speed, load, and environment — consult your application's maintenance schedule or contact us for guidance.
The 1-piece pack is ideal for prototyping, repair, or single-machine builds where you need to verify fit before committing to larger quantities. The 4-piece pack suits small production runs or maintenance kits for multi-axis machines. The 10-piece pack offers the best per-unit value for production environments, spare parts inventory, or workshop stock where the same bearing size is used across multiple assemblies.
The 51100 series is designed for low-to-moderate rotational speeds. Maximum speed ratings vary by size and lubrication method. As a general guideline, these bearings perform best at speeds below 1,500 RPM for grease lubrication. For specific speed ratings by size, please contact us to confirm before use in high-speed applications.
