Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
When your rotating assembly needs to handle axial (thrust) loads without sacrificing smooth operation, a mismatched or undersized bearing becomes a costly failure point. Engineers, machinists, and serious DIYers working on lathes, rotary tables, jacks, and vertical shaft assemblies need a thrust bearing they can spec with confidence. These plane axial ball bearing thrust bearings cover the 51100–51107 series, giving you a verified fit across a wide range of shaft diameters.
Each bearing in this series consists of two hardened steel washers (shaft washer and housing washer) with a ball-and-cage assembly between them, designed to carry pure axial loads in one direction. Bore diameters range from 10mm (0.39 in) to 35mm (1.38 in), with outer diameters from 24mm (0.94 in) to 52mm (2.05 in) and heights from 9mm to 12mm (0.35–0.47 in), following standard 511xx series dimensional tolerances.
Typical use cases include: replacing worn thrust bearings on manual lathe tailstocks and carriage feeds; supporting axial loads in screw jacks and lifting columns; and maintaining shaft positioning in rotary indexing fixtures and turntable assemblies — all scenarios where long-tail searches like "51104 thrust bearing replacement" or "axial ball bearing 20mm bore" lead buyers to exactly this product.
| Bearing Series | 511xx (51100 / 51101 / 51102 / 51103 / 51104 / 51105 / 51106 / 51107) |
|---|---|
| Bore Diameter (d) | 10mm – 35mm (0.39 in – 1.38 in) — See variant options |
| Outer Diameter (D) | 24mm – 52mm (0.94 in – 2.05 in) — See variant options |
| Height / Width (H) | 9mm – 12mm (0.35 in – 0.47 in) — See variant options |
| Bearing Type | Plane Axial Ball Bearing (Thrust Bearing) |
| Load Direction | Unidirectional axial (thrust) load |
| Material | Hardened carbon steel (washers and balls) |
| Cage Type | See variant options |
| Lubrication | Grease-lubricated (apply grease before installation) |
| Operating Speed | Low to moderate (consult bearing load/speed tables for your size) |
| Packing Quantity | 1 pcs / 10 pcs / 50 pcs — See variant options |
Match the bore diameter (d) to your shaft diameter and the outer diameter (D) to your housing seat. The variant names follow the format 51xxx / d×D×H mm — for example, 51104/20×35×10mm means a 20mm bore, 35mm OD, and 10mm height. Always cross-reference with your assembly drawing or the worn bearing's stamped number before ordering.
No. Plane axial (thrust) ball bearings are designed exclusively for unidirectional axial loads. If your application involves combined radial and axial loads, you will need a deep-groove or angular-contact ball bearing instead. Using a thrust bearing under radial load will cause rapid wear and premature failure.
These bearings have a standard corrosion-resistant finish suitable for dry or lightly lubricated indoor environments. For outdoor, marine, or washdown applications where moisture exposure is continuous, consider stainless steel thrust bearings instead. Applying a compatible grease before installation will extend service life in moderately humid conditions.
Yes. These bearings conform to standard 511xx series dimensions (d, D, H), making them dimensionally interchangeable with OEM bearings of the same part number. Always verify the stamped number on your existing bearing — the first five digits (e.g., 51104) identify the series and size.
Apply a thin, even coat of lithium-based or general-purpose bearing grease to the ball-and-cage assembly and both washer faces before installation. Re-lubricate at regular service intervals based on your operating speed and load. Avoid over-greasing, which can cause churning and heat buildup at higher speeds.
Order 1 pc for a single repair or prototype build. Choose 10 pcs if you maintain multiple machines or want a service stock on hand. The 50 pcs option offers the best per-unit value for production runs, batch rebuilds, or resale. All quantities ship as the same bearing — only the count differs.
Plane axial ball bearings are rated for low-to-moderate rotational speeds. The exact limiting speed depends on the bore size, lubrication method, and load — smaller bearings (e.g., 51100/10mm bore) tolerate higher RPM than larger ones (e.g., 51107/35mm bore). For high-speed applications, consult the bearing manufacturer's load/speed tables for your specific size.
