Leveraging the properties of SUS304 stainless steel, R4-series miniature flanged bearings are frequently used in applications such as miniature control valves for seawater desalination equipment and rotor supports for outdoor fountain pumps; they are capable of withstanding both the impact of water flow and corrosion from moisture.
Bearing Features
By precisely controlling the curvature of the internal raceway and utilizing the inherent elasticity of the SUS304 material, these bearings generate minimal heat during high-speed operation, while the flange facilitates heat dissipation into the metal mounting base. In applications involving prolonged exposure to ultraviolet radiation and humid air, the stainless steel material—unlike polymers—does not undergo photodegradation or embrittlement, ensuring the physical integrity of the flanged structure remains consistent over time.
Technical Specifications
| Bearing Reference | Boundary Diameters | Basic Dynamic | Basic Static | Limiting Speeds | ||||||||||||||||||
| Flange | Open | Shield | d inch |
d mm |
D inch |
D mm |
Df inch |
Df mm |
B inch |
B mm |
Bf inch |
Bf mm |
B1 inch |
B1 mm |
Bf1 inch |
Bf1 mm |
rsmin inch |
rsmin mm |
Cr kN |
Cor kN |
Grease | Oil |
| F | SFR168 | ZZ | 0.25 | 6.35 | 0.375 | 9.525 | 0.422 | 10.719 | 0.125 | 3.175 | 0.023 | 0.584 | 0.125 | 3.175 | 0.036 | 0.914 | 0.0039 | 0.1 | 0.372 | 0.176 | 4.2 | 4.7 |
| F | SFR188 | ZZ | 0.25 | 6.35 | 0.5 | 12.7 | 0.547 | 13.894 | 0.125 | 3.175 | 0.023 | 0.584 | 0.1875 | 4.762 | 0.045 | 1.143 | 0.0059 | 0.15 | 1.08 | 0.441 | 3.5 | 3.9 |
| F | SFR4 | ZZ | 0.25 | 6.35 | 0.625 | 15.875 | 0.69 | 17.526 | 0.196 | 4.978 | 0.042 | 1.067 | 0.196 | 4.978 | 0.042 | 1.067 | 0.0118 | 0.3 | 1.48 | 0.617 | 3 | 3.3 |
| - | SFR4A | ZZ | 0.25 | 6.35 | 0.75 | 19.05 | - | - | 0.2188 | 5.556 | - | - | 0.2812 | 7.144 | - | - | 0.0157 | 0.4 | 2.33 | 0.892 | 2.6 | 2.9 |

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