Recommendations for tapping drill sizes for use with fluted taps Ingestion-build-48068 for heat generation by the

for heat generation by the following heat pump systems

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Recommendations for tapping drill sizes for use with fluted taps Ingestion-build-48068 for heat generation by the1 Scope These recommendations give drill sizes, covered by BS 3281, 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.