production standpoint I doubt the blanks are individually cut down them machined into bolts.
Its just not efficient.
More likely the rod stock goes into a multi-tooled multi-chuck machine fed from the back end by X number of 'cylinders' in a revolving feeder and as things cycle the rod feeds in and after one full rotation of the machine, a mostly finished bolt drops out.
For example this machine can hold 6 rods, auto feed them and do 9 or 10 different machine turning operations in one full cycle and produce upwards of a couple thousand parts in a single 8 hour shift depending on what's actually being produced. Completely mechanical with no CNC or computer stuff. Just a guy to stand there and make sure the feed system stays full.
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