Overview
The Koyo 25580/20 is a complete tapered roller bearing set—combining the 25580 cone and matching 25520 cup. This premium-grade set is widely used in Dexter 6,000–7,000 lb axles, boat trailers, caravans, and other heavy-duty trailer applications requiring reliable radial and axial load support. Manufactured in Japan, this bearing set offers precise fitment, high load capacity, and long service life.
⚙️ Technical Specifications
| Specification | Details |
|---|---|
| Brand | Koyo (JTEKT) |
| Part Number | 25580/20 |
| Component | Cone + Cup Tapered Roller Bearing Set |
| Inner Diameter (d) | 44.45 mm (1.750″) |
| Outer Diameter (D) | 82.93 mm (3.265″) |
| Width (cone) | 25.40 mm (1.000″) |
| Width (cup) | 19.05 mm (0.750″) |
| Dynamic Load Rating | ~96.8 kN |
| Maximum Speed | ~6,300 rpm oil-lubricated |
| Material | Chrome Steel, ISO/ANSI standard |
| Country of Origin | Japan |
✅ Why Choose This Bearing?
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Includes both cone + cup—ready for direct hub installation
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Exceptional radial and axial load capacity (~96.8 kN), ideal for heavier trailer assemblies
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Precision heat-treated Japanese manufacturing ensures durability in marine or high-torque environments
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Standard fit in Dexter/Kodiak 7K hub setups and many American axles
Applications & Use Cases
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Commonly specified for Dexter 6,000–7,000 lb hubs and other heavy trailer axles
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Suitable for boat trailers caravans, and heavy-duty builds
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