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When your rotating shaft assembly demands reliable axial load management — whether in a gearbox, hydraulic pump, or vertical motor mount — selecting the wrong bearing means premature failure, vibration, and costly downtime. Engineers, maintenance technicians, and DIY builders who need a single-direction thrust ball bearing in a verified standard size will find this range covers the full 51100-series spectrum in one place.
This listing covers 24 standard sizes of the 51100-series thrust ball bearing, from the compact 51100 (10mm bore × 24mm OD × 9mm height) up to the heavy-duty 51128 (140mm bore × 180mm OD × 31mm height). Each bearing consists of two hardened steel washers (shaft washer and housing washer) and a steel ball-and-cage assembly. The rolling elements are manufactured to dimensional tolerances consistent with ISO 492 / DIN 711 standards.
Typical use cases include: vertical shaft thrust management in industrial pumps and compressors, rotary table and indexing fixture applications in machine tools, and automotive steering column and clutch release assemblies where single-direction axial loads must be isolated from radial forces. These thrust ball bearings for machinery are also widely used in agricultural equipment pivot points and crane hook swivel assemblies.
Full 51100-Series Coverage — 24 sizes from 51100 to 51128 in a single listing; bore diameters range from 10 mm (0.39 in) to 140 mm (5.51 in), eliminating the need to source from multiple suppliers.
Single-Direction Axial Load Design — Flat-washer construction transmits thrust loads along the shaft axis in one direction; not intended for combined radial + axial loading, ensuring correct load path and extended service life.
Hardened Steel Ball & Washer Assembly — Shaft washer, housing washer, and ball-and-cage complement are produced from through-hardened bearing steel, providing consistent surface hardness and wear resistance across the contact zone.
ISO 492 / DIN 711 Dimensional Compliance — Bore, OD, and height dimensions conform to internationally recognized standards, making these bearings interchangeable with other 51100-series components from any ISO-compliant source.
Wide Industrial & Mechanical Application Range — Suited for pumps, compressors, rotary tables, machine tool spindles, steering assemblies, and agricultural pivot points where axial thrust isolation is required.
Sold Individually — Exact Size Selection — Each order is for one (1) bearing of the selected size. Choose your precise bore × OD × height combination from the variant menu to avoid mis-shipment.
| Bearing Series | 51100 (single-direction thrust ball bearing) |
|---|---|
| Standard | ISO 492 / DIN 711 |
| Bore Diameter (d) Range | 10 mm – 140 mm (0.39 in – 5.51 in) |
| Outer Diameter (D) Range | 24 mm – 180 mm (0.94 in – 7.09 in) |
| Height (H) Range | 9 mm – 31 mm (0.35 in – 1.22 in) |
| Available Sizes | 51100, 51101, 51102, 51103, 51104, 51105, 51106, 51107, 51108, 51109, 51110, 51111, 51112, 51113, 51114, 51115, 51116, 51117, 51118, 51120, 51122, 51124, 51126, 51128 |
| Load Direction | Single-direction axial (thrust) only |
| Rolling Element | Steel balls with cage |
| Washer Material | Through-hardened bearing steel |
| Lubrication (as supplied) | See variant options |
| Dynamic Load Rating (C) | See variant options |
| Static Load Rating (C₀) | See variant options |
| Max Operating Speed | See variant options |
| Quantity per Order | 1 piece |
Match the bearing's bore diameter (d) to your shaft diameter, the outer diameter (D) to your housing seat, and the height (H) to your available axial space. All three dimensions are listed in each variant name (e.g., 51106 = 30 mm bore × 47 mm OD × 11 mm height). If your shaft is metric and falls between listed sizes, always size up to the next available bore to avoid interference fit issues.
No. The 51100-series is a single-direction thrust bearing designed exclusively for axial loads acting along the shaft axis. Applying radial loads to this bearing type causes rapid washer and ball wear. If your application involves combined axial and radial loading, consider a deep-groove ball bearing or angular contact bearing instead.
Both the shaft washer and housing washer are produced from through-hardened bearing steel (typically equivalent to 100Cr6 / GCr15 grade), which provides the surface hardness needed to resist brinelling under static thrust loads. The balls are also bearing-grade steel. This construction does not include stainless steel or ceramic options in this listing.
Standard 51100-series bearings use carbon bearing steel, which is not inherently corrosion-resistant. For wet, humid, or mildly corrosive environments, apply a compatible grease or oil lubricant and consider periodic relubrication. For highly corrosive or food-grade environments, a stainless-steel thrust bearing (not this listing) would be more appropriate.
Yes. The 51100-series dimensions follow ISO 492 and DIN 711 standards, meaning bore, OD, and height are interchangeable with any other ISO-compliant 51100-series bearing. This makes them suitable as direct replacements in existing machinery without housing or shaft modification, provided the size designation matches exactly.
Each order includes one (1) individual bearing of the size you select from the variant dropdown. If you need multiple pieces, simply increase the quantity in your cart. Bulk pricing inquiries for larger quantities are welcome — use the contact form on our site.
For most industrial and mechanical applications, a lithium-based grease (NLGI Grade 2) is suitable. For high-speed applications, a light mineral oil or low-viscosity grease reduces heat buildup. Avoid mixing incompatible grease types. Apply lubricant to the ball-and-cage assembly and both washer faces before installation, and re-lubricate at intervals appropriate to your operating speed and load.
