BS 328-6-1992 pdf download.Drills and reamers — Part 6: Countersinks, 90°, with parallel shanks and solid pilots.
1 Scope This International Standard specifies the dimensions, in millimetres, and the tolerances of 90° countersinks with parallel shanks and solid pilots for general use.
2 Normative reference The following standard contains provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the edition indicated was valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent edition of the standard indicated below. Members of IEC and ISO maintain registers of currently valid International Standards.
ISO 286-2:1988, ISO system of limits and fits — Part 2: Tables of standard tolerance grades and limit deviations for holes and shafts.
3 Dimensions The dimensions and tolerances are shown in Figure 1 and given in Table 1. NOTE 1 Figure 1 illustrating this International Standard is diagrammatic only. It is not intended to show details of design.
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BS 328-6 pdf download.