The numbers refer to the dimensions of the frame in millimetres, so 21 = 21 mm, etc.
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The bar has a symbol BAR22/2/6 (or BAR22-2-6). The bar is marked with “22” because it is slightly longer (21.8 +/- 0.3 mm).
The relative winding width is longer than in most of other ferrite cores, which allows for the bobbin to have multiple sections. The manufacturer offers the multiple-chamber bobbin, but there is no indication of how all the parts should be held together (e.g. a clip).
|Σ(l/A)||core factor||5.06 mm-1|
|Ve||effective volume||312 mm|
|le||effective length||40 mm|
|Ae||effective area||7.9 mm2|
|Amin||minimum area||5.7 mm2|
|m||mass of frame||1.5 g|
|m||mass of bar||1.0 g|