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Wedge Expansion Anchor (Bolt)

Question: can wedge expansion expansion anchor bolts be uninstalled (removed).

I am securing a fire safe (60" H, 435 lbs) to my garage floor -- manufacturer recommends 4 "wedge anchors" of minimum 3" long & 9/16" dia.

Once installed, can the anchors be "unexpanded" for removal, to move the safe ??

I suppose I can buy 4, hand tight one a little, and reverse it to see of the wedge elbow retracts. . .

A. Spruce
Re: Wedge Expansion Anchor (Bolt)

Generally, no, the wedges do as they are supposed to and secure the bolt in the hole, what you can do is simply cut them off and leave it or tap the bolt shank down into the hole and fill with a bit of mortar.

Re: Wedge Expansion Anchor (Bolt)

You see them on city concrete sidewalks, in places where they used to have newsstands or mail boxes which were removed. The bolts cut off and ground to the concrete.

Re: Wedge Expansion Anchor (Bolt)

How about Tapcon concrete/masonry screws ? I have never used them, and don't know if they come in the size needed, especially the diameter.

Anyone unscrewed them ?


MLB Construction
Re: Wedge Expansion Anchor (Bolt)

i use tapcon screws all the time....no reason not to use them and you can remove them later

Re: Wedge Expansion Anchor (Bolt)

Or you could install lead rawl plugs The bolt can be installed and unscrewed later.


Re: Wedge Expansion Anchor (Bolt)

What to do here is use the recommended anchor, but drill the hole at least 1/4" deeper (1/2" deeper is better) than the bolt is long and clean it out well with compressed air before dropping the wedge anchor in. When you want it to go away, tap it down flush then finish with a punch like setting a nail. A dab of concrete grout and it disappears forever like magic.

I use and like Tapcons (and yes they are removable but sometimes you have to upsize to get the same hole to work with another one). I wouldn't use then here because they are more brittle and have less holding strength than a wedge anchor. I'd avoid the lead inserts for the same reason and because they will melt with enough heat (this is a fire safe).

If you do anything other than what the manufacturer calls for, whatever warranty or insurance that may have applied may be denied in the event of a claim. Unless you can prove it against a panel of engineers in court, what you think is equal or better may not turn out to be that way. Me? I'd take my chances with that and use high-tensile anchors designed to be epoxied in with the correct epoxy for that purpose. In concrete, nothing is stronger with pull-out medians measured in tons- the concrete breaks apart first if these are done right.


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