Thread cutting nuts???

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Jaked1985

Not-quite-so-new-guy
Sep 2, 2016
8
4
3
Can someone give me some input on what size the nuts are that hold the rear bumper cover and quarter panel extensions on an 84 monte?
I picked up a package of what I thought were correct, 6.3x1.00 11mm socket head and 18mm washer size.
They look correct, but, they won't tighten down. They thread on fine, just won't tighten up.

The only other non standard size I can find are 5mm×1.0. Which I thought might be too small..
 

oldsmobile joe

Royal Smart Person
Nov 12, 2015
2,067
3,053
113
mpls
and i believe the head on them is 10 or 11 mm
joe
 
  • Agree
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