Hi Listers, Take a fine thread bolt and a coarse thread bolt of the same
diameter, look at the threaded part in profile. You will notice that the
fine threads are not as deep into the 'root' of the bolt as the coarse
threads. This thicker root allows for the 20% or so increase in strength
that fine threads have over coarse threads of the same diameter. Your bolt
info for the day. Pat Mahoney '69 2000
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