This standard specifies a system of tolerance grades and required machining allowance grades for the dimensions of castings. It is applicable to the dimensions of cast metals and their alloys produced by various casting manufacturing processes (see clause 5). This standard applies both to general tolerances and/or required machining allowances given on a drawing and to individual tolerances and/or required machining allowances which are shown immediately following a specific dimensions (see clause 11). The system specified applies when the foundry provides the pattern or die equipment or accepts responsibility for proving it.