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Technical hidden bolts in concrete floor; how to do it???

Discussion in 'The Hokey Ass Message Board' started by atch, Apr 13, 2020.

  1. atch
    Joined: Sep 3, 2002
    Posts: 4,530


    I've got one of those cheapie tire machines. Don't know what brand it is 'cause I bought it at a swap meet about 20 years ago. It looks just like the HF model shown below though.

    I want to put 4 anchors in the middle of my concrete shop floor that I can use to bolt this to when I need to use it. BUT, 99.99% of the time I won't want it there. So I need a way to put bolts into the anchors but not have the bolt heads stick up where I would trip on them. If there're no bolts in the empty anchors in about 3 days the holes will be full of dirt/grit and no bolt would ever go into the anchor again.

    I've had this thing bolted to a pallet ever since I bought it, but I need the floor space and want to get it off of the pallet.

    I'm thinking if I had a masonry drill bit larger than the bolt head (and appropriate sized socket) I could just countersink the bolts down into the concrete to where the bolt head is flush with the surrounding concrete. Unfortunately I don't have any such animal and don't really want to put out the ca$h to buy one to countersink 4 holes.

    Anyone got any better suggestions than buying a drill bit?

  2. uncleandy 65
    Joined: Jan 14, 2013
    Posts: 3,161

    uncleandy 65

    Check with Lowes or Menards and look in their cement section and see what they use to anchor things in cement.
  3. squirrel
    Joined: Sep 23, 2004
    Posts: 46,847


    put four set screws into the anchors when you're not using the thing. You can make them by cutting the heads off bolts, and cutting a slot in the end with a hacksaw.

    I put my tire machine like that outside on the concrete pad in front of my shop, off to one side. Doesn't get in the way there.
    41 GMC K-18, Mr48chev, acme30 and 5 others like this.
  4. What Squirrel just said. ^^^

    Look for a female threaded drop in anchor. Hilti makes different sizes. Plenty strong once set.

    It makes sense to machine a screwdriver tanged top .. to replace the bolt. Thanks for the idea, Squirrel.

    Don't know my practical use for it .. but definitely filed away for future use. Keeping it simple, right ?
    Texas Webb likes this.

  5. 41rodderz
    Joined: Sep 27, 2010
    Posts: 5,194

    from Oregon

    When I worked for the state we had anchors recessed in the cement with a flip top and some had square cover that fit recessed flush with the floor . Flip tops kept dirt, foreign objects etc out . Flat recessed covers just had a hole in the middle to stick your finger in .
    kidcampbell71 likes this.
  6. drtrcrV-8
    Joined: Jan 6, 2013
    Posts: 1,324


    Suggest looking at a HILTI catalog for flush concrete inserts. They work just like any insert, except they are "innies" as opposed to "outies", & you use bolts to retain your tire machine, & have a flush surface when you remove them. I would also suggest using allen set screws in the holes when the machine is in storage, to keep dirt out of the holes. It's really a lot simpler/easier than it sounds!! LOL!
  7. 41rodderz
    Joined: Sep 27, 2010
    Posts: 5,194

    from Oregon

    Nobody say anything about sticking “your finger in the hole”:oops::p
  8. nochop
    Joined: Nov 13, 2005
    Posts: 1,719

    from norcal

    Joined: Dec 14, 2009
    Posts: 2,665


    FD7A58AF-4A83-4DFB-AA26-E226CF5898F4.jpeg CEC028E5-06F5-4412-B2DD-E8EB1CB566E4.jpeg

    these guys

    you can rent a larger concrete drill bit to counter sink the hole so the bolt head sits flush to the floor once you thread it back into the insert
    Or carefully chisel a recess in
    Only gotta go down the thickness of the bolt head.
    And like squirrel said, use a hack saw and cut a line in the top of the bolt so you can unscrew it with a screw driver once it’s in flush.

    or be fancy and use Allen head bolts !!
  10. Atwater Mike
    Joined: May 31, 2002
    Posts: 10,263

    Atwater Mike

    Go Dutch...
    belair likes this.
  11. Jalopy Joker
    Joined: Sep 3, 2006
    Posts: 25,264

    Jalopy Joker

    also, check Grainger and other hardware supply locations for Red Head concrete anchor fasteners
    swade41 and uncleandy 65 like this.
  12. Recess the anchors slightly and use rounded head Allen bolts.
    VANDENPLAS, I missed your last line.:)
    Last edited: Apr 13, 2020
    nochop and VANDENPLAS like this.
  13. Bearing Burner
    Joined: Mar 2, 2009
    Posts: 881

    Bearing Burner
    from W. MA

    Years ago at work we put lead sleeves in the hole and then thread a Lag bolt into that which can then be unscrewed leaving the sleeve in place.
  14. ROADSTER1927
    Joined: Feb 14, 2009
    Posts: 2,790


    Put a plastic plug in that pulls out easy.
  15. fastcar1953
    Joined: Oct 23, 2009
    Posts: 2,217


    Atch pm me. I have the drill and bits. Would be glad to help do it. I'm just a few miles away.
  16. BamaMav
    Joined: Jun 19, 2011
    Posts: 4,410

    from Berry, AL

    I would use anti seize on the bolt threads when you screw them in. It will help keep them from binding up with the grit from the floor that will find its way into the socket threads.
    Texas Webb and clem like this.
  17. flatford39
    Joined: Dec 3, 2006
    Posts: 2,673


    I used those inserts on my floor. When I need to use them I just blow it our with my air compressor.
    Texas57, Cosmo49 and VANDENPLAS like this.
  18. '34 Terraplane
    Joined: Jul 11, 2011
    Posts: 230

    '34 Terraplane
    from Western PA

    "Set-screw" type allen will thread down into floor-anchored nut of about any size you want. (You'll probably have to clean the dirt out of the end of it when you want to get the allen wrench in it for removal.) allen.jpg
  19. RmK57
    Joined: Dec 31, 2008
    Posts: 1,590


    Thats what I used. Small ones from hydraulic fittings work perfect.
    VANDENPLAS and Cosmo49 like this.
  20. Cosmo49 likes this.
  21. jimmy six
    Joined: Mar 21, 2006
    Posts: 7,112

    jimmy six

    Still have them in my garage with 1/2” Allen set screws in them.
  22. Firedup
    Joined: Feb 2, 2018
    Posts: 141

    from Oregon

    Like a few have said. Flush shell anchors are the cat’s ass.
    VANDENPLAS likes this.
  23. Tickety Boo
    Joined: Feb 2, 2015
    Posts: 1,147

    Tickety Boo
    from Wisconsin

    I bolted mine to a 4 x 4 foot sheet of 3/4" plywood with stove bolts, got it standing in the shop corner with the more H.D. H.F. bead breaker. Put it where you want when using it, just make sure your standing on the plywood base.
    Works for me ;)

    I have even borrowed it out. :cool:
  24. Blue One
    Joined: Feb 6, 2010
    Posts: 10,675

    Blue One
    from Alberta

    This is the answer and really the best solution from all the suggestions.

    I installed them in my garage and then I put the same bases on many other shop tools so that I can use the same anchors for multiple uses.
    1) my JD2 tubing bender
    2) my power bead roller
    You get the idea. :cool:
    Cosmo49 likes this.
  25. atch
    Joined: Sep 3, 2002
    Posts: 4,530


    Thanx everyone for your replies. I hadn't thought of hacksawing a slot in a bolt or using allen head set screws.

    I like those ideas.

    I had thought of putting it on the concrete apron outside but I've seen several of them that rusted up pretty badly when put outside. Besides, about the only place out there on concrete is where I store firewood.
  26. atch
    Joined: Sep 3, 2002
    Posts: 4,530


    That's pretty much what I have now except it's a pallet instead of plywood. And yes, you HAVE to be standing on the pallet when using it.
    Tickety Boo likes this.
  27. Cosmo49
    Joined: Jan 15, 2007
    Posts: 1,185


    hacksawing a slot in a bolt That is what I thought everybody used for transmission install guide pins, works like a good helper that half knows what he's doing!
    31Vicky with a hemi likes this.
  28. Ebbsspeed
    Joined: Nov 11, 2005
    Posts: 5,137


    Not sure if everyone does, but I certainly do. They work slicker than owl shit on a green hickory limb.
  29. Fortunateson
    Joined: Apr 30, 2012
    Posts: 3,411


    X2 I did the same thing...
  30. I’m just wondering why when I start a thread like this somebody reports it and then it says oh this would be better for garage journal and shut it down.

    Is that just me
    swade41 and kidcampbell71 like this.

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