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?


  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 :)