Is there a rule / equation for the optimal screw diameter per wood thickness?

I have a 16mm baltic birch plywood, I have two pices 30mmX20mmX16mm I want to butt join them at their profile What will be the optimal diameter for the 16mm? The max diameter before the layers split to achieve max amount of bend strength

  • $\begingroup$ That sounds like asking for trouble if you are trying to withstand bending. Can you provide any form of wrap around reinforcement to prevent splitting on the tension side? Like glass wrap? $\endgroup$
    – DKNguyen
    Commented Jun 28, 2021 at 14:42
  • $\begingroup$ Not possible :( I can add a thin aluminum profile Also a brass / aluminum tube But it will add complexity and cost to the project $\endgroup$
    – Simon
    Commented Jun 28, 2021 at 15:14


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