Thread: Multi thread cutting
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03-10-2013 #2
Last Activity: 13-05-2015
All threads have standard drilling and shaft sizes which MUST be followed. So for a standard M20 x 2.5 coarse thread, you need to drill out 17.5mm before tapping. The O.D. of the shaft is irrelevant as long as it's bigger than the thread diameter. For male threads, the O.D. is 20mm, so if you had a 30mm shaft, you'd have to turn part of it down to 20mm before using a threading die. Tap Chart Metric Threads
Last edited by birchy; 03-10-2013 at 05:46 PM.
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