Historical
BS 6615:1996
Specification for dimensional tolerances for metal and metal alloy castings (British Standard)
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.
British Standards Institution [bsi]