Inner Fender Well Bolts 5/16-18 x 7/8 or 5/16 x 24 x 7/8??

Discussion in 'Chassis restoration' started by bostoncat68, Jan 27, 2018.

  1. bostoncat68

    bostoncat68 Platinum Level Contributor

    Guys -- my Wildcat has a random assortment of bolts holding the fender wells in - totally from the coffee can on the bench... What is supposed to be holding these things in? (I know there are a few sizes in a few places -- but what is the primary bolt??). I think it's 5/16-18 x 7/8??
     
  2. dynaflow

    dynaflow shiftless...

    If big cars are same as a-bodies, depends on where built. Flint a-bodies uses 5/16X 12, GMAD use the finer thread...
     
    bostoncat68 likes this.
  3. bostoncat68

    bostoncat68 Platinum Level Contributor

    I have some of those in there too -- hence my question... My car was built in Kansas City...
     
  4. dynaflow

    dynaflow shiftless...

    If you have both on same part (fender, inner) then someone's been in there (bodywork, resto). They're not self-tap, so any wrong ones damage threads in welded nut...
     
  5. ToddsGS

    ToddsGS Founders Club Member

    There are typically 3 different bolts used on Inner Fenders:
    DCM11107.jpg

    DCM11914.jpg

    DCM12500.jpg

    I stock all 3 of these if you are looking for nice new replacements.
    The bolt shown in the middle with the washer is usually the one in the upper center section of the Inner Fender.
    These are all 5/16" Bolts. Standard thread and a coarse thread (Somewhat self tapping)

    I also stock the replacement nuts that are used in the Inner Fenders

    DCM10558.jpg


    More info on these and 1,000's of other GM / Buick Fasteners on my website.

    Let me know if I can help at all.




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