I have a few 3/8" double expansion concrete anchors and noticed that on one side it is threaded and on the other it is not.

Which side goes into the hole? Double Bolt Anchor

  • You can see it. So far we cannot see it. Please post a suitable picture. – Michael Karas Sep 18 '17 at 0:19
  • Added an image of the double expansion concrete anchors displaying both sides; the threaded and non threaded side. – Rick Sep 18 '17 at 1:42

It looks to me that the threaded end should go into the hole first. As the bolt is used to cinch the mounted item the back of the mounted item will compress the front side of the expansion anchor toward the threaded part while at the same time threaded part pulls forward to expand the anchor in the hole.

  • That's what I do. Otherwise, the unthreaded wedge wouldn't have any force on it. – George Sep 18 '17 at 3:34

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