| US stock number | 12481 | |||
| Design | HM21 | |||
| Lip material | R | |||
SKF Bore Tite Coating

| d1 | 31.75 | mm | |
| D | 50.8 | mm | |
| b | 6.35 | mm |
| Pressure differential | max. | 0.07 | MPa | |
| Operating temperature | min. | -40 | °C | |
| Operating temperature | max. | 100 | °C | |
| Operating temperature, short period | max. | 120 | °C | |
| Rotational speed | max. | 6015 | r/min | |
| Shaft surface speed | max. | 10 | m/s |
| Model No. | Inner Diameter | Outer Diameter | Width | Type |
| 28700 | ||||
|---|---|---|---|---|
| 53211 + U 211 | ||||
| FY 5/8 TF | ||||
| K 24x30x31 ZW | ||||
| QJ 238 N2MA |
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