Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
When a rotating shaft needs to resist axial (thrust) forces without binding or overheating, the wrong bearing choice leads to premature wear, misalignment, and costly downtime. Engineers, machinists, and hands-on builders who work with lathes, rotary tables, jacks, and steering columns need a thrust ball bearing they can size precisely and trust under continuous load.
This listing covers the 51100 series thrust ball bearings in six standard sizes — 51100 through 51105 — with bore diameters ranging from 10 mm (0.39 in) to 25 mm (0.98 in) and outer diameters from 24 mm (0.94 in) to 42 mm (1.65 in). Each bearing consists of two hardened steel washers and a ball-and-cage assembly, designed to carry pure axial loads in one direction.
Typical applications include vertical shaft positioning in drill press tables, axial load management in hydraulic jack screws, rotary indexing fixtures, and light-duty automotive steering column assemblies. The compact 9–11 mm height across all six models makes them a practical fit for space-constrained thrust ball bearing replacement projects.
| Bearing Series | 51100 (single-direction thrust ball bearing) |
|---|---|
| Available Models | 51100 / 51101 / 51102 / 51103 / 51104 / 51105 |
| Bore Diameter (d) | 10 mm – 25 mm (0.39 in – 0.98 in) — see variant options |
| Outer Diameter (D) | 24 mm – 42 mm (0.94 in – 1.65 in) — see variant options |
| Height / Width (H) | 9 mm – 11 mm — see variant options |
| Load Direction | Axial (single direction) |
| Raceway Material | Hardened bearing steel |
| Cage Type | See variant options |
| Lubrication | Grease-lubricated (relubrication recommended for continuous duty) |
| Dimensional Standard | ISO 104 / DIN 711 |
| Operating Temperature | Typically –20 °C to +120 °C (–4 °F to +248 °F) |
| Quantity per Pack | 1 / 2 / 5 / 10 / 50 pieces — see variant options |
Match the bore diameter (d) to your shaft size. The 51100 fits a 10 mm shaft, 51101 fits 12 mm, 51102 fits 15 mm, 51103 fits 17 mm, 51104 fits 20 mm, and 51105 fits 25 mm. Measure your shaft with a caliper before ordering — a 1 mm mismatch will prevent proper seating and cause premature failure.
No. The 51100 series is designed exclusively for single-direction axial (thrust) loads. Applying significant radial force to a thrust ball bearing will cause rapid raceway damage. If your application involves combined axial and radial loads, consider a deep-groove ball bearing or angular contact bearing instead.
The raceways are hardened carbon steel, which provides good wear resistance but limited corrosion resistance without additional protection. For damp or outdoor environments, apply a compatible bearing grease with corrosion inhibitors and consider regreasing at regular intervals. For fully corrosive environments (salt spray, chemical exposure), stainless steel thrust bearings would be more appropriate.
A lithium-based NLGI #2 grease is suitable for most general-purpose applications. Bearings arrive with an initial grease fill. For continuous-duty or high-temperature applications, establish a regreasing interval based on operating hours — typically every 500–1,000 hours for moderate-speed, moderate-load conditions. Avoid over-greasing, which can cause churning and heat buildup.
Yes. The 51100 series dimensions conform to ISO 104 / DIN 711 standards, which means bore, outer diameter, and height are interchangeable with 51100-series bearings from other manufacturers that follow the same standard. Always verify the three key dimensions (d, D, H) against your existing bearing or housing drawing before substituting.
Common indicators include increased axial play (shaft moves up and down more than usual), audible grinding or clicking during rotation, visible pitting or spalling on the raceways when disassembled, or elevated operating temperature at the bearing location. If any of these signs appear, replace the bearing promptly to avoid damage to adjacent components.
Each size (51100 through 51105) is a separate variant in this listing. You can add multiple variants to your cart in a single order — simply select the bearing size and quantity for each model you need. If you require a large mixed-size order, contact us to confirm availability and lead time.
