Full definition
Alphanumeric system standardized under ISO 15 / DIN 623 that completely identifies a bearing: type, dimension series, bore diameter, variants and special features. Structure: prefix (internal modifications) + base number (type + series + bore) + suffix (sealing, clearance, cage, precision). Example: 6205-2RS1/C3 = deep groove ball bearing (6), series 02 (2), 25 mm bore (05), two SKF contact seals (2RS1), C3 clearance. Suffixes vary by manufacturer.