Thread: Gun safes, concrete, and AnkaScrews

Bottle brush the dust out of the holes vigorously
Some malphoid/dpm/tarpaper in a layer under the floor of the safe will separate the steel from the damp concrete, smearing it with grease would also help

With anka screws I find that you can nip them up and the max torque arrives quite quickly, too much and they just spin

If they won't rattle in they often take dust off the internal faces so rattle them back out, blow out the hole and try again

If you go dynabolts you can undo them later, pin punch the shaft down into the hole and fill em back up same as an ankascrew hole