Im concrete, How deep does the hole have to be so that a 3" anchor sleeve is most effective?
I'm drilling in very hard concrete, and I've drilled about 2.5" in depth. Is that good enough?
They'll be used to anchor these simpson ez bases.
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You can get the engineering info including shear and tension strength for that fastener from the manufacturer's web site.
The tables in that document show values for a minimimum embedment of 1-1/2". It's probably stronger at 2-1/2" or 3" but you couldn't count on it.
Without knowing the actual loads involved nobody could say whether this is enough, depends on more than just the fitting you're using.
Note that if they stick up too much you'll wind up trimming the excess off the bolt, which might be more work than just drilling another 1/2". With a decent bit and hammer drill that should not take long at all.