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When axial loads cause premature wear or shaft misalignment in your machinery, the right thrust bearing makes all the difference. Engineers, machinists, and hands-on DIYers who need dependable single-direction axial load capacity will find this 51100–51311 series thrust ball bearing range covers virtually every common shaft size in one listing.
Each bearing is a 3-part assembly — comprising a shaft washer, a housing washer, and a ball-and-cage assembly — machined from hardened bearing steel. Sizes span from 10mm bore × 24mm OD × 9mm height (51100) up to 55mm bore × 105mm OD × 35mm height (51311), with metric dimensions clearly listed for each variant (approximately 0.39 in to 2.17 in bore).
Typical use cases include rotary table thrust support, automotive steering column assemblies, hydraulic cylinder end caps, lathe tailstock spindles, and general industrial shaft-end axial load management — all scenarios where a compact, low-profile thrust bearing with a standardized footprint is required.
| Series | 51100 / 51200 / 51300 (single-direction thrust ball bearings) |
|---|---|
| Design Type | 3-part (shaft washer + housing washer + ball-and-cage assembly) |
| Bore Diameter (d) | 10mm – 150mm (see variant options for exact size) |
| Outer Diameter (D) | 24mm – 190mm (see variant options for exact size) |
| Height / Width (H) | 9mm – 35mm (see variant options for exact size) |
| Material | Hardened bearing steel (races and balls) |
| Load Direction | Single-direction axial (thrust) |
| Dimensional Standard | ISO 355 / DIN 711 |
| Lubrication | See variant options |
| Operating Temperature | See variant options |
| Quantity per Order | 1 bearing (3-part set) |
Match the bore diameter (d) to your shaft diameter, the outer diameter (D) to your housing bore, and confirm the height (H) fits your axial clearance. Each variant in this listing shows all three dimensions (e.g., 51104: 20mm × 35mm × 10mm). When in doubt, measure your existing bearing or housing with calipers before ordering.
All three are single-direction thrust ball bearings with the same 3-part construction. The series designation reflects the relative width (height) of the bearing for a given bore size: 51100 is the lightest/narrowest series, 51200 is medium, and 51300 is the widest/heaviest-duty series for the same bore diameter. Choose a heavier series when your application involves higher axial loads or requires a stiffer assembly.
No. Thrust ball bearings in the 511xx / 512xx / 513xx series are designed exclusively for axial (thrust) loads in one direction. They are not suitable for radial loads. If your application involves combined radial and axial loads, consider a deep groove ball bearing or angular contact bearing instead.
Standard hardened steel thrust bearings offer moderate corrosion resistance when properly lubricated, but are not rated for continuous exposure to water, salt spray, or corrosive chemicals. For wet or outdoor environments, apply a suitable grease or oil and consider relubrication intervals. Stainless steel variants are not included in this listing.
A lithium-based grease (NLGI Grade 2) is suitable for most general-purpose applications. For high-speed or high-temperature environments, consult a bearing lubrication guide for the appropriate viscosity. Relubrication intervals depend on operating speed, load, and temperature — typically every 500–2,000 operating hours for industrial machinery.
The shaft washer (with the smaller bore) seats against the rotating shaft, and the housing washer (with the larger bore) seats against the stationary housing or end cap. The ball-and-cage assembly sits between them. Ensure both washers are seated flat and square — misalignment significantly reduces bearing life. Apply a thin film of grease to the raceways before assembly.
Yes. The 51100–51311 designation follows ISO/DIN dimensional standards, so bearings with the same part number from different manufacturers share identical bore, outer diameter, and height dimensions. They are dimensionally interchangeable as direct replacements in existing housings.
Speed ratings vary by size — smaller bearings generally support higher RPM than larger ones. As a general reference, smaller sizes in this series (e.g., 51100–51105) are typically rated for several hundred to a few thousand RPM under grease lubrication. For exact speed ratings for your selected size, contact us to confirm.
