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When a rotating shaft needs to handle axial (thrust) loads without wobble or premature wear, the wrong bearing choice costs time and money. Engineers, machinists, and serious DIYers working on lathes, rotary tables, automotive steering columns, and industrial machinery need a thrust ball bearing that seats cleanly and holds up under continuous one-directional load. The 51100–51107 series is the go-to solution for bore sizes ranging from 10mm to 35mm (approximately 0.39 in to 1.38 in).
Each bearing in this series consists of two hardened steel washers (shaft washer and housing washer) and a steel ball-and-cage assembly. The bore diameter spans 10mm (51100) through 35mm (51107), with outer diameters ranging from 24mm to 52mm and a uniform 9mm height across the series. All components are manufactured to standard dimensional tolerances compatible with ISO 10 / ABEC 1 class fits.
Typical applications include: replacing worn thrust bearings in lathe spindle assemblies, supporting axial loads in rotary indexing fixtures, and serving as replacement thrust bearings in automotive steering and suspension components. Long-tail use cases include DIY go-kart axle builds, CNC router Z-axis leadscrew support, and shop-built arbor press upgrades.
| Bearing Series | 51100 / 51101 / 51102 / 51103 / 51104 / 51105 / 51106 / 51107 |
|---|---|
| Bore Diameter (d) | 10mm / 12mm / 15mm / 17mm / 20mm / 25mm / 30mm / 35mm |
| Outer Diameter (D) | 24mm / 26mm / 28mm / 30mm / 35mm / 42mm / 47mm / 52mm |
| Height (H) | 9mm (uniform across all sizes) |
| Bearing Type | Single-Direction Thrust Ball Bearing |
| Race Material | Hardened Steel |
| Ball Material | Steel |
| Cage Type | See variant options |
| Load Direction | Axial (one direction) |
| Dynamic Load Rating (C) | See variant options |
| Static Load Rating (C0) | See variant options |
| Max Speed (grease) | See variant options |
| Lubrication | Contact us to confirm |
| Available Quantities | 1 Pcs / 4 Pcs / 10 Pcs |
Match the bore diameter (d) to your shaft diameter. For example, if your shaft is 20mm, select the 51104 (20mm × 35mm × 9mm). Then confirm the outer diameter (D) fits your housing bore and that the 9mm height clears your assembly. All dimensions are listed in the variant selector above.
No. The 511xx series is designed exclusively for single-direction axial (thrust) loads. They are not suitable for radial loads. If your application involves combined radial and axial loads, consider angular contact or deep groove ball bearings instead.
These bearings use hardened steel races and balls, which offer good wear resistance but are not inherently corrosion-proof. For wet or chemically exposed environments, apply appropriate grease or consider stainless steel variants. Contact us to confirm availability of corrosion-resistant options.
They are compatible with any application that uses standard ISO 511xx series thrust bearings, including metal lathes, rotary tables, CNC Z-axis leadscrews, arbor presses, automotive steering columns, and general industrial machinery. Always verify bore, OD, and height match your housing specifications before installation.
Choose 1 Pcs for a single repair or prototype. The 4 Pcs pack suits small batch builds or keeping a spare on hand. The 10 Pcs pack offers the best per-unit value for workshop stock, production runs, or projects requiring multiple bearing positions.
Lubrication state may vary by batch. We recommend applying a suitable bearing grease (such as lithium-based NLGI #2) before installation to ensure proper lubrication from first use. Contact us to confirm the lubrication state of current stock.
The 511xx series conforms to ISO and DIN dimensional standards for single-direction thrust ball bearings. This ensures interchangeability with housings and shafts designed to accept standard 511xx series bearings from any compliant manufacturer.
