Weidmueller SCREWTY M8F KO O. SD

Therefore, "SCREWTY M8F KO O. SD" likely describes a precision tool (possibly a tap, die, or specialized driver) for M8 fine threads. The "KO" and "O. SD" parts are likely product codes or specifications unique to the manufacturer.  To get the precise definition and specifications, you would need to consult the manufacturer's documentation or catalog.