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Homepage>BS Standards>25 MANUFACTURING ENGINEERING>25.100 Cutting tools>25.100.30 Drills, countersinks, reamers>BS 1157:1975 Recommendations for tapping drill sizes for use with fluted taps
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immediate downloadReleased: 1975-09-30
BS 1157:1975 Recommendations for tapping drill sizes for use with fluted taps

BS 1157:1975

Recommendations for tapping drill sizes for use with fluted taps

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Standard number:BS 1157:1975
Pages:28
Released:1975-09-30
ISBN:0 580 08685 2
Status:Standard
DESCRIPTION

BS 1157:1975


This standard BS 1157:1975 Recommendations for tapping drill sizes for use with fluted taps is classified in these ICS categories:
  • 25.100.30 Drills, countersinks, reamers

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.