Due to the design of the post, the grade and the full thread are required. A325 structural bolts are not typically made in this diameter. Thus, there are a couple of options.
Our current details list
Bolt - ASTM A449 or SAE J429
Gr. 5
Nut - ASTM A563DH or SAE J995
Note that this hardware should all be galvanized. That may require ordering plain SAE Grade 5 cap screws and having them glavanized or special ordering the A449 bolts. I have contacted Bennett Bolt in NY and know they can fabricate them.
Thanks
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