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So we drilled into concrete to bolt down steel bases with several Titen 3/8" x 3" Titen heavy duty Screw Anchor.

I'll be replacing the base, so I will need to remove the screw, remove the base, and then re-bolt the new base to the concrete. I will probably use new screws, but can I reuse the hole? I would be using the same exact screw.

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That will depend on how loose the hole was to begin with and what damage occurred when you removed the screw. Concrete is unforgiving of abrasion, so when you install and remove a screw you grind away material.

If the pullout loads aren't huge for what you're doing I'd run them in and see if they grab. If you have a lot of pull on them, maybe add epoxy when you reinstall to improve grip.

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