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When a rotating shaft needs to resist axial (thrust) forces in a compact space, standard radial bearings fall short. Hobbyists building RC vehicles, engineers assembling small gearboxes, and repair technicians servicing precision instruments all face the same challenge: finding a miniature thrust ball bearing that fits a 3–10 mm bore without sacrificing load capacity or dimensional accuracy. These miniature plane thrust ball bearings are engineered specifically for that gap.
Each bearing consists of a grooved upper raceway, a grooved lower raceway, and a ball-and-cage assembly. The grooved raceway design channels axial loads evenly across all rolling elements, reducing point stress and extending service life. Bore sizes range from 3 mm (≈ 0.118 in) to 10 mm (≈ 0.394 in), with outer diameters from 8 mm to 18 mm and thicknesses from 3.5 mm to 5.5 mm depending on the selected variant. Bearing numbers follow the F-series designation (F3-8 through F10-18), making cross-referencing against standard bearing catalogs straightforward.
Typical use cases include axial load management in miniature stepper motor assemblies, thrust support in 3D printer Z-axis lead screw setups, and rotational constraint in small pneumatic or hydraulic valve actuators — all scenarios where a miniature thrust ball bearing for small shaft diameters is the correct engineering choice.
| Bearing Type | Plane (flat) thrust ball bearing |
|---|---|
| Bearing Series | F-series (F3-8 to F10-18) |
| Bore Diameter (I.D.) | 3 mm – 10 mm (≈ 0.118 in – 0.394 in) |
| Outer Diameter (O.D.) | 8 mm – 20 mm (see variant options) |
| Thickness | 3.5 mm – 7 mm (see variant options) |
| Load Direction | Axial (thrust) only |
| Material | Hardened bearing steel |
| Raceway Profile | Grooved (both upper and lower) |
| Pack Quantity Options | 1 Pcs / 5 Pcs / 10 Pcs |
| Lubrication | See variant options |
| Operating Temperature | Contact us to confirm |
Match the I.D. (inner diameter) of the bearing to your shaft diameter. For example, if your shaft is 6 mm, select a variant with a 6 mm bore such as F6-12 or F6-14. The O.D. and thickness should then be verified against your housing bore and available axial space. Use the variant option table on this page to compare all available I.D. × O.D. × Thickness combinations.
Both share a 6 mm inner diameter, but F6-12 has a 12 mm outer diameter and 4.5 mm thickness, while F6-14 has a 14 mm outer diameter and 5 mm thickness. Choose F6-14 when your housing can accommodate the larger O.D. and you need a slightly wider load-bearing surface. Choose F6-12 when radial space is tighter.
No. Plane thrust ball bearings are designed exclusively for axial (thrust) loads — forces acting parallel to the shaft axis. They are not rated for radial loads. If your application involves combined radial and axial loading, a deep-groove ball bearing or angular contact bearing would be more appropriate.
These bearings are manufactured from hardened bearing steel, which provides good wear resistance but limited inherent corrosion resistance. For damp or wet environments, apply a compatible bearing grease or oil to the raceways and balls before installation, and re-lubricate periodically. For highly corrosive environments, contact us to confirm suitability or discuss stainless steel alternatives.
The F-series designation (e.g., F7-15) is a standardized bearing number used across major bearing catalogs. Look up the F-series number in any standard bearing reference — the I.D., O.D., and thickness listed there should match the variant dimensions shown on this product page. This makes direct substitution straightforward when replacing a worn bearing.
Order 1 Pcs for prototyping, fit-checking, or single-unit repairs. The 5 Pcs pack suits small batch builds or keeping one spare on hand. The 10 Pcs pack offers the best per-unit value for production runs, maintenance kits, or workshop stock where the same bearing size is used across multiple machines.
