Tapping Drill Sizes for BSF Threads

The following tables show the range of drill sizes suitable for tapping BSF (British Standard Fine) screw threads.

The first table gives general information about BSF threads - the thread angle, and, for each size, the nominal diameter and thread pitch.

Please also read the general comment on the Tapping Index page.

BSF table BSF tapping 1 BSF tapping 2 BSF tapping 3 BSF tapping 4 BSF tapping 5 BSF tapping 6