Castings — System of dimensional tolerances and machining allowances
Mainly indicate the tolerance of castings, such as sand casting, investment casting, die casting and other casting method.
Applies to cast metals and their alloys produced by various casting manufacturing processes. Is applicable 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 dimension. The system specified applies when the foundry provides the pattern or die equipment or accepts responsibility for proving it.