the minor diameter should fall between 4.917mm - 5.153mm
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40 threads per inch. The thimble has 25 divisions. Every 1 turn moves the spindle .025 and .025 x 40 = 1.000 .
threads per inch
In the context of a hex bolt specification such as "5-16NC," the "NC" stands for National Coarse. This indicates the thread pitch of the bolt, specifically that it follows the National Coarse thread standard. National Coarse threads have fewer threads per inch compared to National Fine threads, making them better suited for applications where rapid assembly or disassembly is required.