6405 Open Deep Groove Ball Bearing for High-Load Industrial and Automotive Drives | 25×80×21 Mm
The 6405 is a robust Medium Series Deep Groove Ball Bearing in a standard open design, engineered to deliver exceptional radial load capacity and reliable service in demanding power transmission systems. Manufactured without integral seals or shields, this bearing is optimized for applications where it operates within pre-lubricated housings or receives regular external lubrication. With a 25 mm bore, a substantial 80 mm outer diameter, and a 21 mm width, it offers a durable and versatile solution for heavy-duty industrial gearboxes, motors, and axle systems.
6405 Deep Groove Ball Bearing 25×80×21 mm | ISO Series – Standard | Open Type
This bearing is built on the proven deep groove principle, capable of smooth operation at speeds up to 12,000 r/min (Oil). It is designed to accommodate high radial loads and moderate axial loads in both directions. The open configuration ensures optimal lubricant flow and heat dissipation, making the 6405 a cornerstone component for industrial machinery and automotive applications that prioritize load capacity, durability, and easy maintenance access.

Suited for a wide range of heavy-duty industrial and automotive applications where high load capacity and reliability are paramount:
The open-type construction allows for maximum lubricant compatibility and efficient heat management. It is the ideal choice for integration into gearboxes and systems where the housing provides sealing and centralized lubrication is utilized.
Manufactured to exacting standards, the bearing features precision-ground raceways and high-quality steel balls. This ensures smooth, low-friction rotation, minimal vibration, and extended service life across a wide range of operating conditions.
Constructed from premium chrome steel (SAE 52100/GCr15) and built to medium series dimensions, the 6405 is designed to withstand significant dynamic and static loads, ensuring reliability in the most demanding applications.
| Bearing Type | Single Row Deep Groove Ball Bearing |
| ISO Dimension Series | 64 Series – Medium |
| Basic Designation | 6405 |
| Suffix | Open (Standard) |
| Bore Diameter (d) | 25 mm |
| Outer Diameter (D) | 80 mm |
| Width (B) | 21 mm |
| Material (Races & Balls) | Chrome Steel (GCr15 / SAE 52100) |
| Precision Class | Standard / P5 Grade Available |
| Cage Material | Steel Stamped |
| Dynamic Load Rating (Cʳ) | 34.5 kN |
| Static Load Rating (C₀ʳ) | 17.5 kN |
| Limiting Speed (Grease) | 10,000 r/min |
| Limiting Speed (Oil) | 12,000 r/min |
| Weight (approx.) | 0.53 kg |
Common manufacturer equivalents include:
The 6405 is supplied as a standard open bearing, providing maximum design flexibility. It is the recommended base type for systems with effective external sealing. For standalone applications exposed to dust or moisture, sealed variants such as the 6405-2RS (double rubber seals) or 6405-ZZ (double metal shields) should be specified.
"The 6405 open deep groove ball bearing is a fundamental choice for engineers designing heavy-duty gearboxes, industrial drives, and transmission systems, where proven load capacity and integration into a lubricated system are key requirements."
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