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Bolt pattern 5 on 5.5 diameter

Discussion in 'The Hokey Ass Message Board' started by elroots33, Nov 11, 2010.

  1. Hello,
    Does anyone of you could give me the diameter of the studs on a 5 on 5.5 bolt pattern ?
    I must drill a flask with this bolt pattern, but I don't know exactly the real diameter.
  2. if you are talking about old ford 5 on 5-1/2" , the studs have 1/2-20 thread
  3. Nortin
    Joined: Oct 27, 2005
    Posts: 77

    from Canada

    The drill bit for drilling holes for the studs is undersized so the splines on the stud will cut their way into the flange material. Drill size is critical to a strong stud installation
  4. Oh, sorry ... I think I didn't right explain my need ...
    Yes, I talk about the early Ford bolt pattern.
    When we talk about 5-1/2" (139.7mm), measured between the center of a stud and the exterior of those are not adjacent of it, can we consider this 5-1/2 dimension is also the diameter on which the 5 studs are positionned ?
    I must draw on my flask the circle on which the studs will come, and I want to be sure of the diameter.
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  5. i think we are missing each other with the translation , but if you drew a line through the center of each of the 5 studs 5-1/2 inches would be the diameter

    set your compass at 2-3/4"...that's the radius..... then draw a circle from the center point. that will give you the bolt circle. divide the circle into 5 equal parts and that's the bolt pattern

    curious...why do you need to put this on a flask? i keep brandy in mine

    edit: i wasn't thinking clearly with 2-1/2 , 2-3/4 inches is correct
    Last edited: Nov 11, 2010
  6. seb fontana
    Joined: Sep 1, 2005
    Posts: 4,910

    seb fontana
    from ct

    Maybe means disc..
  7. The radius of 5 1/2" is actually 2 3/4".
  8. mr.chevrolet
    Joined: Jul 19, 2006
    Posts: 4,987


    the radius would be 2-3/4"
  9. propwash
    Joined: Jul 25, 2005
    Posts: 3,858

    from Las Vegas

    I think he's asking for the I.D. of the actual stud....

  10. big duece
    Joined: Jul 28, 2008
    Posts: 4,345

    big duece
    from kansas

    2 1/2 radius would be 5 dia, 2 3/4 radius would be 5.5 circle dia.
    Joined: Aug 10, 2006
    Posts: 2,261


    When measuring bolt pattern its a criss cross measurment, center to center of stud . same as titening lugs. If it was from lug to lug that would be a large pattern?
  12. Measure center of one stud, skip the adjacent stud, to the outside of the next stud (the third stud).
    This is for 5 lug pattern.
  13. shmoozo
    Joined: Aug 14, 2007
    Posts: 662

    from Media, PA

  14. I'm going to make these flasks to change the Volvo 5 x 108mm I have on my rear end to the 5 x 139.7mm of early Ford.
    That is to use the same wheels as the front end, where I've got Ford 46 drums.
    Thanks for all these precisons
  15. seb fontana
    Joined: Sep 1, 2005
    Posts: 4,910

    seb fontana
    from ct

    Maybe means Flange....
  16. To change the dimension of the rear hubs and the bolt pattern, if you prefer !
  17. sawbuck
    Joined: Oct 14, 2006
    Posts: 1,651

    from 06492 ct

    this is the right way
  18. seb fontana
    Joined: Sep 1, 2005
    Posts: 4,910

    seb fontana
    from ct

  19. Yes, I know that way to measure, Crminal, but I just want to know if this dimension is also the diameter of the circle that studs make !
    Your way is to measure, when the diameter is needed to draw and drill the holes, do you understand !?
  20. Yes, Seb Fontana, a sort of adaptors, but placed and welded around the Volvo hubs, behind the drums.
    I make this job to not use external adaptors which enlarge a lot (about 60mm) the rear end.
  21. I get it now. If I were home, I'd get a circle template out and measure for you.
    For now, I'll turn it over to a fellow Hamb'er:p
  22. Sorry, guys, it's near 2:00am in France, and I go to bed !! Thanks a lot !

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