That is a characteristic of "Dimpled" nuts. When the dimple is reached
it takes considerably more torque to go beyond that point. The "nut" is
deformed at that point and has a slightly smaller diameter at those 3
points. The goal is to make the nut so tight that is can't come off, but
more than 3 spots would make the nut far too tight to get on with out
the required torque damaging the bolt. It works well with large bolts
that can stand some damage to the threads, but seems inappropriate for
galvanized tower bolts. (Just my opinion)
73
Roger (K8RI)
On 1/27/2016 Wednesday 6:15 AM, StellarCAT wrote:
I bought the bolts from Hill Radio ... they’ve been working with Rohn... Rohn says they’ve not changed the design of the bolts in “some
time” and indeed it is because of the need to “meet standards”. THEY say they probably will remove the galvanizing!! So they’re
aware apparently of the fact that their design will reduce the life of the bolt itself! On the first ‘set’ (leg set) I opened, and by the way
these appear to be Chinese made as they have a “JDF” marking on the top which a Google search says is a Chinese metal fastener maker, (they
are marked as Grade 5 also), I could not turn the nut past the point when the dimples met the thread of the bolt.
Thanks for all the comments... I’ll figure something out.
Gary
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73
Roger (K8RI)
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