The diameter of the head of both bolts is 9/16".
I can't tell you the thread pitch since I am not familiar with that
I am very skeptical of these bolts sold to me as "Rohn Hardware",
but I wanted to inquire of those more knowledgeable than I.
Tnx & 73
Thread pitch is the number of "threads per inch", usually stated as "1/4"-20".
My R25G bolts all came with "fine" threads or SAE threads as some call them.
The size of your bolt head, 9/16", makes me think these are 5/16" or even 3/8"
bolts. R25G uses 2 sizes per leg - so, I would have to guess that R45/55
series would too...The 5/16" size is the only one common to both, but again,
compare those threads. Most Home Depot/Lowes stores have a display with
sizes mounted so you can match what you have... Fine thread, like 24 pitch, in
galv bolts is rare to find in common home owner type stores...they usually
only carry course threads. IF they are grade 5, there will be 3 little "cast in
the head of the bolt" lines or ridges...kind of like a 3-blade airplane prop.
This is the universal sign for high strength steel bolts. IF you don't see
those, don't use them.
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather
Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions
and ask for Sherman, W2FLA.
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