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5/16" 18thrd
This item appears to me to be made of some type of clear (no knots) pine. The grain is finer than yellow pine so it could possibly be white pine. Poplar is another probability.
No.
yes
On my kneeling stool I epoxied nuts into holes I drilled in the stool. Seems to be holding well.
Very strong. I added to an ottoman and it worked very well
Yes, i removed and added a longer threaded lag screw (2 1/2") It is a 5/16" bolt size