My apologies on which section I called out the comment on assembling the galvanized bolts and nuts prior to shipping, it is actually under "Code of Standard Practice for Steel Buildings and Bridges" Section 6.6.2 (page 16.3-32).
But the ANCO nut is a self-locking nut. It uses a steel locking pin which engages the threads of the bolt as you tighten it. To undo the preassembled bolts and nuts the locking pin would have to be pryed back which is tedious and also defeats the purpose of using the ANCO nuts.
In section 6.6.2 of the "Specification for Structural Joints Using ASTM A325 or A490 Bolts" in the 13th edition of the AISC manual it states, "galvanized ASTM A325, A325M... must be assembled and shipped in the same container according to length and diameter." My company uses galvanized ANCO...
