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 UNC threads.

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Tapping Drill Sizes for UNC Threads

The following tables show the range of drill sizes suitable for tapping UNC (Unified National Coarse) screw threads.

The first table gives general information about UNC 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)