Deep Groove Ball Bearings FAG 6404 -C3

The 6404-C3 deep groove ball bearing from FAG Rolling Bearings, with dimensions of 20x72x19 mm and a C3 clearance, offers a tried-and-tested solution for radial loads.

The 6404-C3 deep groove ball bearing is a single-row rolling bearing to standard tolerance class P0/PN, manufactured from standard rolling bearing steel 100Cr6. FAG has designed this model for applications in which predominantly radial forces and moderate axial forces are present. Thanks to its design with deep raceways, the integrated sheet steel cage guides the rolling elements at a uniform distance. With dimensions of 20 mm bore, 72 mm outside diameter and 19 mm width, the design meets common requirements in industrial mechanical engineering and for repairs.

What is the 6404-C3 deep-groove ball bearing suitable for in operation?

This single-row bearing primarily accommodates high radial loads as well as axial forces in both directions. The open design is intended for installation environments where an existing lubrication system or a sealed housing provides the lubricant supply. The component covers an operating temperature range from –30 to +120 degrees.

With an outside diameter of 72 mm and a bore diameter of 20 mm, the 6404 series features a robust cross-section. Compared to narrower series, this wall thickness ensures reliable force transmission under demanding operating conditions in mechanical engineering.

What advantages does the increased C3 bearing clearance offer in your design?

The designation C3 indicates a slightly increased radial bearing clearance compared with the standard version. This additional clearance between the rolling elements and raceways compensates for thermal expansion caused by heat build-up during operation. When the inner and outer rings are constricted by tight fits, the C3 clearance prevents the bearing from seizing.

As no sealing washers are fitted by the manufacturer, the component runs with low friction in direct contact with the external lubricant.