Thrust Ball Bearings 51100 - 51128 - ALL SIZES

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.