Does anybody know what bolt size I need for those gas tank straps on an 81ish chevy c30? I lost one of the bolts and the other bolt is kind of a pain to take off an on again.

  • What is the head size of the one which remains? If it's a 9/16" head, it's more than likely a 3/8"-16 thread. You'd just have to ensure the bolt is long enough. If you can give me the head size, I can figure out what the thread is for you. Apr 1, 2019 at 16:34
  • sorry my bad, its a knut that goes on the end of one these things 1aauto.com/fuel-tank-with-strap-set/i/…
    – volare
    Apr 1, 2019 at 16:35
  • Still, what is the head size of the nut (or opposing bolt)? Apr 1, 2019 at 16:36
  • It is a 5/8 head
    – volare
    Apr 1, 2019 at 16:45
  • 1
    It is most likely a 7/16"-14 thread. Most nuts/bolts of this type are coarse threaded. I'm surprised, though ... usually these are captured nuts, to make installation easier. You sure something isn't rusted through? Apr 1, 2019 at 16:50

1 Answer 1


Annnnd the winner is 3/8-16. Thanks for playing folks.

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