The nomenclature used is;
5200 = Double row medium duty metric and the 5208 denotes a 40mm bore (multiply the last 2 digits by 5). The 2RS denotes seals both sides.
For Timken this is a 5208W bearing, however in doing a bit of research Timkens catalog states that their double row bearings are NOT pre-lubricated and as such they seem to offer only a single sided shield.
Julian
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