If the core diameter of threads equal to the diameter of unthreaded portion of the bolt, then it is known as
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A bolt of uniform strength can be manufactured using two methods:
1. Turning down the unthreaded shank diameter until it matches the core thread root diameter ($d_{\text{shank}} = d_c$).
2. Drilling an axial longitudinal hole through the center of the shank to reduce its net cross-sectional area to match the core area.