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When axial loads cause premature wear, misalignment, or noisy operation in rotating assemblies, the root cause is often an undersized or incorrect bearing type. Engineers, maintenance technicians, and DIY builders working on lathes, gearboxes, automotive steering columns, and industrial machinery need a thrust bearing that holds its geometry under sustained one-directional load — without adding unnecessary radial bulk.
These 51304–51311 series 3-part thrust ball bearings consist of three precision-ground components: a shaft washer (tight-fit ring), a housing washer (loose-fit ring), and a ball-and-cage assembly seated between them. Available in eight bore sizes from 20mm (0.787 in) to 55mm (2.165 in), with corresponding outer diameters from 47mm (1.850 in) to 105mm (4.134 in) and thicknesses from 18mm (0.709 in) to 35mm (1.378 in). Order in quantities of 1, 2, 3, or 5 pieces to match your project scale.
Typical applications include vertical shaft support in drill press columns, axial positioning in lathe tailstocks, thrust load management in automotive clutch release mechanisms, and preload control in CNC spindle assemblies. The standardized 513xx designation ensures cross-brand dimensional interchangeability for replacement and retrofit projects.
| Bearing Series | 51304 / 51305 / 51306 / 51307 / 51308 / 51309 / 51310 / 51311 |
|---|---|
| Bearing Type | Single-direction thrust ball bearing, 3-part |
| Inner Diameter (ID) | 20 / 25 / 30 / 35 / 40 / 45 / 50 / 55 mm |
| Outer Diameter (OD) | 47 / 52 / 60 / 68 / 78 / 85 / 95 / 105 mm |
| Thickness (Height) | 18 / 18 / 21 / 24 / 26 / 28 / 31 / 35 mm |
| Number of Parts | 3 (shaft washer + housing washer + ball & cage assembly) |
| Load Direction | Single-direction axial (thrust) |
| Dimensional Standard | ISO / DIN 51300 series |
| Available Quantities | 1 Pcs / 2 Pcs / 3 Pcs / 5 Pcs |
| Material | See variant options |
| Cage Type | See variant options |
| Operating Temperature | Contact us to confirm |
Match the bearing's inner diameter (ID) to your shaft diameter. For example, if your shaft is 30mm, select the 51306 (30×60×21mm). Always verify the outer diameter fits your housing bore and that the thickness suits your axial clearance. When in doubt, measure the existing bearing or shaft seat directly with calipers.
Thrust ball bearings are designed exclusively for axial (push/pull along the shaft axis) loads and cannot support significant radial loads. Radial ball bearings handle forces perpendicular to the shaft. If your application involves both load directions, a combined angular contact or tapered roller bearing may be more appropriate.
No. The 513xx series is a single-direction thrust bearing. It supports axial load in one direction only. For bidirectional axial loads, you would need a double-direction thrust bearing (522xx or 532xx series) or two opposing single-direction units.
Standard 513xx thrust ball bearings use carbon steel raceways and are not inherently corrosion-resistant. For damp or washdown environments, apply a compatible grease or consider stainless-steel variants. Contact us to confirm material options if corrosion resistance is a hard requirement.
These open-type thrust ball bearings require external lubrication — typically a lithium-based grease (NLGI Grade 2) or a light machine oil depending on speed and load. Apply lubricant to the ball-and-cage assembly before installation and re-lubricate at regular maintenance intervals based on operating conditions.
Check the designation stamped on your existing bearing (e.g., 51306, 51308). If it matches one of the sizes listed here, the dimensions conform to ISO/DIN 51300-series standards and the replacement will be dimensionally compatible. Always cross-check ID, OD, and thickness against your housing drawings before installation.
Ordering 2, 3, or 5 pieces at once reduces per-unit cost and ensures you have spares on hand for scheduled maintenance or unexpected failures. For production machinery or fleet vehicles, keeping matched spares in stock minimizes downtime when a bearing needs replacement.
