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Default Lag bolts vs. carriage bolts

How about using threaded brass inserts into the base, then bolt
through the feet?

"GonnyGump" wrote in message
Bottom line: Which is stronger, lag bolts or carriage bolts?

Context and details:
I am building a large (12' long) oak dining room table, the base for
which will be two 18" diameter circular columns. Each of the

will sit on a 20" circular "plate" (about 4" thick) that, in turn,
will be supported by four scroll feet. The scroll feet will be
cantilevered out from the plate by about 6". My question is how

to secure feet to the plate. The two options a a) 4-1/2" lag
bolts up through the heels of the feet and into the plate; or b)
carriage bolts following the same path through the feet and plate

secured with a nut countersunk into the top of the plate. Can

advise me which will be more secure, both structurally and against

potential wood movement?

Thanks in advance for useful insights and comments.