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 BA threads.

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Tapping Drill Sizes for BA Threads

The following tables show the range of drill sizes suitable for tapping BA (British Association) screw threads.

The first table gives general information about BA 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.

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

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I think the whole thing is brilliant. I think you have done a terrific job designing this and putting it all together. You deserve to be very successful and I have already started spreading the word even before assembly! (Graeme)

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