MODRATEC Useful Data (otherwise known as MUD) is a series of pages containing helpful information particularly relevant to rail modellers. The tables on this page use our easy-to-compare format to show tapping drills suitable for BSF threads.

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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.

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What an excellent kit. It worked as soon as I finished putting it together .... (Richard)