![]() ![]() You can see why I'd expect a 3/4 x 10 to be a loose screw-in fit to an M20 x 2.5. It sounds like you tried that in the metric hole, and if so it should not have fit, but the 3/4 x 10 might have.Ī 3/4 x 12 in metric terms would be an "M19.05 x 2.12", and a 3/4 x 10 would similarly in metric terms be an "M19.05 x 2.54". Calculating Tap Drill Size for M8 X 1.25 (Metric Thread) D 8 mm P 1.25 mm H p 65 T D 8 65 × 1.25 76.98 6.94 mm. ![]() You seem to want an M20 x 2.5, but you also refer to a 3/4 x 12. I am totally unclear as to what your various pieces are. With a 2.5mm pitch, a 10 TPI should have screwed in, especially since a 3/4" bolt is 1 mm under the 20mm nominal major diameter. It is about the difference between a 10 tpi and a 17 tpi thread (not exactly that, but close).īUT, if a 12 tpi is a near-fit, that suggests that a 2mm pitch is the correct one. Since the next one is quite different, you should be able to determine the difference easily. It is almost a 10 TPI thread (25.4 mm per inch) and is normally the only one easily available, just as a hardware store normally has only the coarse US threads available. The threads of an M20 x 2.5 are 2.5mm from crest to crest. ![]() So the 1, 1.5, and 2.5 are all possible pitches for a 20mm bolt, given in millimeters. The *0.1* is the distance between thread crests of a 10 tpi thread in inches. The metric designation METHOD, if used to describe a US 3/4 x 10 thread, would mean it was described not as a *3/4 x 10*, but as a *3/4 x 0.1* (probably actually as a 0.75 x 0.1, but whatever). Metric threads are designated as a diameter and a pitch, or distance between threads. US threads, and "imperial British" threads are designated as a diameter and a number of threads per inch. Metric thread pitches are designated in the reverse way as US threads. The Equation is: Drilled hole size Nominal outside diameter (Double thread depth x Percentage of full thread) Now let’s go through the chart below to find out the drilled hole size for the tap you’re using. ![]()
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