FWIW, a standard Acme thread does have a clearance specification on the major and minor diameters. It appears that this spec was met, but, a better design would have been to control the OD of the shaft (easy) and control the major diameter of the internal thread (difficult), to try to make a centralizing thread. This way, the hub major thread ID sits on the OD of the shaft, and the actual clearance of the flanks of the threads is not critical.
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