I am trying to locate in BS-8888 what is the geometric tolerance for concentricity (cylinder+tap hole) on turned parts.
Could anyone help?
Thank you in advance.
BS8888 does not provide specific guidance on concentricity tolerance however paragraph 9.1 - 9.3, general tolerances does suggest the usage of BS EN 22768-1 also known as ISO 2768-1 for general tolerances.
BS8888 is a drafting as well as dimensioning and tolerancing standard.
Specific tolerances, whether ISO 2768 or otherwise are designed by the engineering drawing creator ~ engineer or designer.
Here's a webpage with ISO 2768 general tolerances:
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