Can I use pitch diameter bolts with split ring timber connectors?

Often bolts 10” and longer are made with reduced bodies and full size threads. These are bolts where the unthreaded shank is equal to the pitch dimeter of the threads and the threaded portion is equal to the nominal diameter. This is allowable per ASME B18.2.1 dimensional tolerances and ASTM A307 Grade A hex bolts. However, The American Wood Council does not allow this when used in conjunction with split rings. In section of the 2015 National Design Specification for Wood Construction, it says, “Bolts used with … split ring connectors … shall have an unreduced nominal or shank (body) diameter in accordance with ANSI/ASME Standard B18.2.1.” If you are going to use reduced body bolts, you will want to confirm with the project engineer that this is allowable.

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