Half inch threaded bolt and half inch hole in concrete?

If it's a standard threaded bolt and no glue it will not hold. You need something meant for concrete anchoring. If the package tells you to use a certain glue you will need to follow the directions. You can use these to attach the metal to concrete they sell them at the home depot but you will probably need a heavy duty impact and an SDS drill in order to get the bolts into the concrete https://www.fastenersplus.com/products/1-2-x-5-con...  or just use some drop in anchors

you can use epoxy resin to locate bolts ..blow out dust  before you start 

There are several ways to put an anchor bolt in concrete, non of which is the way you are indicating.   For the reason you state, i.e. no way to anchor the threads into the concrete.  All of the anchor bolt methods have very specific requirements on the dimensions of the drill hole in the concrete and the specific anchor bolt to be used.   The most common anchor bolt is the "red head", the brand name for an expansion type bolt.  Another anchor bolt is the "tapcon" bolt/screw.   An older method is to fix a conventional bolt in a larger hole with molten sulphur.  More recent methods are the epoxy grout instead of sulphur. I don't know of straight epoxy in a concrete hole. And, if the bolt hole is horizontal, not vertical, you have problems getting some of the above attachment methods to stay in the hole.  (The epoxy will run out of the horizontal hole).  Now, if that 4x4 is column, you had better check your structure for racking.  That bolt will not take the moment (torque) of a lateral load and will pull out in a wind storm.   Your structure has to have fixed connections at the corner columns to be stable.  Fixed meaning columns dug into post holes in the ground at least 2 feet and the hole filled with concrete.  You should also worry about rotting of the ends of your wood post on the concrete.