"Miguel" wrote in message
...
On Wed, 22 Jan 2014 20:06:01 -0800, "PrecisionmachinisT"
wrote:


Those probably are rolled threads.

If it was it was pretty sneaky as the o.d. of the threads and the
bolt
was identical :-)

Even micrometer threads are rolled. Look closely at how the metal
extruded at the end, amd measure the ODs of the threads and the
unthreaded shank.
jsw