BSI BS 1157:1975

Current Revision
Recommendations for tapping drill sizes

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BSI BS 1157:1975

Recommendations for tapping drill sizes

PUBLISH DATE 1975
PAGES 28
BSI BS 1157:1975

These recommendations give drill sizes, covered by BS 328-1, for use prior to tapping the threads indicated.

Table 1 to Table 14 cover preferred thread forms and Table 15 to Table 17 cover non-preferred forms.

Appendix A covers alternative tapping drill sizes.

Sizes for ISO internal metric threads to BS 3643 (Parts 1, 2 and 3) and for internal threads to BS 21, 84, 93, 1580 (Parts 1, 2 and 3) and 2779.

Alternative sizes in appendix.

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