What size drill bit for 6m hole?

Discussion in 'General Questions' started by Fletch, Aug 30, 2010.

  1. Fletch

    Fletch Member

    I am going to try to drill a new hole in the front engine mount after one of the studs broke. I couldn't get it out so I impatiently just drilled into the stud and filled the whole thing with JB-Weld. I bought a 6m tap, but I don't know what size drill bit to use for the new hole?

    Thanks!
     

  2. GearNut

    GearNut Active Member

  3. motorpsycho

    motorpsycho Active Member

    ewwwww, jb weld...........
     
  4. GearNut

    GearNut Active Member

    Yeah, I know.... It's the most highly regarded plastic putty in the world.
    It has it's merits but I doubt it will hold up to the stresses of a motor mount.
    It is a form of plastic after all...
    Oh well, it's worth a try. :)
     
  5. Paratrooper

    Paratrooper New Member

    d (tap drill) = D (tap size) - (number 1 divided by # of threads per inch) . You don't give a TPI so we'll use 25 just for illustration purposes . The number 1 divided by 25 equals .040 . The "D" (6 MM) is .236 . Subtract .040 from .236 and you have .196 . That would be your tap drill . Again , with no TPI this is just a way of showing the equation used to determine tap drill size . BTW , I use JB Weld on my Baja Bug .
     
  6. Al.Fisherman

    Al.Fisherman Active Member

    LOL in another word... #9 :)
     
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