Identifying SKF special bearings

On a standard bearing, the digits tell you the series and bore. With BAA 0003, BT1-0163 or BC1-0125 they don't: the prefix indicates the bearing type and the number is just sequential. You cannot get dimensions out of these part numbers, and two consecutive numbers may be completely unrelated parts.

Some partly break the rule. BS2-2205-2RS/VT143 contains a familiar base, that of a spherical roller bearing, plus blocks that describe a sealed version. Even so, do not swap it for the standard bearing with that base without checking the width, which is usually different. The rule holds: copy everything, including hyphens, slashes and spaces.

Because the part number says nothing about the bearing itself, context counts for more here than in other lines. The machine make and model, the bearing position and the equipment maker's part number let us confirm the part when the marking is worn.

If the original bearing is no longer obtainable, a replacement is found by dimensions and function: bearing type, bore, outside diameter, width, sealing and any special feature such as a flange, a groove or a heavier outer ring. That takes the part in hand or a drawing; a photo alone is seldom enough.

Send the part number exactly as engraved, plus the quantity, the make and model of the equipment and where the bearing is mounted. If the marking is only partly legible, give us the main dimensions and photos of both faces and the edge. Tell us whether you need that exact part number or would consider an alternative with matching dimensions.