This series of products is manufactured from high-quality SUS440 stainless steel and is specifically designed for precision environments with strict space constraints. As ultra-thin deep-groove ball bearings, they feature a minimal cross-section, offering advantages in reducing overall equipment weight and enabling compact designs. In terms of material properties, the SUS440 stainless steel provides excellent hardness and corrosion resistance, ensuring structural stability even when exposed to moisture or mildly corrosive media.
Bearing Features
Regarding operational precision, the compact structure results in low frictional torque, making these bearings ideal for miniature motors or precision instruments that require high-speed, low-noise operation. In terms of reliability, despite the thin wall profile, precision manufacturing processes ensure the concentricity of the inner and outer rings, effectively extending service life under light-load conditions.
Technical Specifications
| Bearing Reference | Boundary Diameters | Basic Dynamic | Basic Static | Limiting Speeds | ||||||||||
| Flange | Open | Shield | d mm |
D mm |
Df mm |
B mm |
Bf mm |
B1 mm |
Bf1 mm |
rsmin mm |
Cr(kN) | Cor(kN) | Grease | Oil |
| F | S681 | - | 1 | 3 | 3.8 | 1 | 0.3 | - | - | 0.05 | 0.074 | 0.02 | 16.5 | 18.5 |
| F | S682 | ZZ | 2 | 5 | 6.1 | 1.5 | 0.5 | 2.3 | 0.6 | 0.08 | 0.167 | 0.049 | 9.4 | 10.6 |
| F | S683 | ZZ | 3 | 7 | 8.1 | 2 | 0.5 | 3 | 0.8 | 0.1 | 0.314 | 0.108 | 6.6 | 7.4 |
| F | S684 | ZZ | 4 | 9 | 10.3 | 2.5 | 0.6 | 4 | 1 | 0.1 | 0.637 | 0.225 | 5.1 | 5.7 |
| F | S685 | ZZ | 5 | 11 | 12.5 | 3 | 0.8 | 5 | 1 | 0.15 | 0.715 | 0.284 | 4.1 | 4.6 |
| F | S686 | ZZ | 6 | 13 | 15 | 3.5 | 1 | 5 | 1.1 | 0.15 | 1.08 | 0.441 | 3.5 | 3.9 |
| F | S687 | ZZ | 7 | 14 | 16 | 3.5 | 1 | 5 | 1.1 | 0.15 | 1.18 | 0.51 | 3.1 | 3.5 |
| F | S688 | ZZ | 8 | 16 | 18 | 4 | 1 | 5 | 1.1 | 0.2 | 1.25 | 0.588 | 2.8 | 3.1 |
| F | S689 | ZZ | 9 | 17 | 19 | 4 | 1 | 5 | 1.1 | 0.2 | 1.32 | 0.666 | 2.5 | 2.8 |

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