Higher tolerance (ISO 3) generates a rough fit with a large gap. Lower tolerance (ISO 1) generates a fine fit without a gap on the flanks between screw and nut. Tap Drill Sizes: Fractional Cut Taps Tap Drill Sizes and Pitch Diameter Limits Vol 2 Tapping Guide Example: Determine Drill Size for 212N Tap,70 Full Thread. The first option, 1/4-20 is the coarse thread option (fewer threads per inch). tolerance on internal thread (nut) Normal tap tolerance is ISO 2 (6H), which generates an average quality fit between screw and nut. (See Figure 1.) In the left-hand column of the table, you will see two 1/4 options. Imperial has made a concerted effort to provide accurate information in its catalog and on its web site. Thread Calculator and Chart for metric thread, npt thread, bsp thread, unf thread, unc thread, acme thread, bspp thread, un thread, bspt thread, pipe thread, stub acme thread and buttress thread. To determine what tap drill size you need, go to the Inch Tap Drill Sizes table in our Drill Tap Chart.
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