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I recently made a bracket for mounting a TV onto a custom pipe mount that I built.

enter image description here

I was advised at my local hardware store to use a carriage bolt here for the following reasons:

  1. These counter-sunk holes will be flush against the back of the monitor, so there'll be no way for me to make sure that the bolt doesn't twist when I tighten the nut on it.
  2. By hammering in a carriage bolt, it will "grab" the edges of the hole and prevent it from twisting.

For anyone who, like me, previously did not know what a carriage bolt is:

enter image description here

(The square block at the top, when hammered into the material you're using, will grab and secure the bolt, supposedly.)

Unfortunately, this setup isn't working the best for me. I have lock-nuts, which are extremely difficult to get onto the bolts. When I try doing it with my drill, it actually strips the backside here and the bolt spins freely.

My main question is this: is there a type of carriage bolt that has some kind of phillip's, flathead, or allen wrench socket on the back to initially setup the tension? My plan for now is to do something with two nuts like this:

1.   2.  3.  4.
|-######-l|--|

1. The carriage bolt.
2. My MDF.
3. A lock-nut and washer.
4. The bracket, washer, and lock-nut. 

I'm thinking that this will secure it really well, but I'll need to provide reverse tension while installing the first lock-nut. Any ideas?

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1 Answer

up vote 8 down vote accepted

Lock nuts and carriage bolts are a bad combination and even worse when trying to use them in material like particle board or MDF.

You could try to use a Tee nut from the monitor side and then simply use a short hex head bolt into the Tee nut.

enter image description here

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Awesome, so basically: Monitor|Hex Bolt|T-Nut|MDF|Washer/Nut|Pipe Fastener|Washer/Nut? Or should the T-Nut go on the other side of the MDF? Should the T-nut have its teeth toward the monitor through the MDF or away from the monitor through the MDF? –  Naftuli Tzvi Kay Jan 29 '13 at 20:58
    
@TKKocheran -- T-nuts need to be installed from the opposite side of where you expect to be able to access the bolt head. The T-Nut is the nut for the bolt and there would be no reason to use another nut with it...unless you had some scheme to let a longer bolt pass all the way through the T-nut so that you could bolt additional things on the protruding part of the bolts. I cannot give any more details of the bolt-nut-washer-materials configuration because I do not have any information of what you are trying to achieve. –  Michael Karas Jan 30 '13 at 2:01
    
+1. The problem here was using a carriage bolt in particle board/MDF, it's just the wrong tool for the job. The OP may find that MDF was the wrong choice for this project, but that's another question altogether. –  Tester101 Jan 30 '13 at 12:13
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