Pat :
By far the most common size is 1/4-28 UNF (all the bolts that hold the
body together are 1/4-28). The next 3 most common (roughly equal) are
1/4-20 UNC, 5/16-24 UNF and 3/8-24 UNF. Those four sizes cover maybe
90% of the threaded fasteners. After that, there are all kinds of
screwball threads, including other UNC/UNF threads, metric, BSF, BA, NPT
(common pipe threads), BSPS, and a few that I've never found in thread
charts (like the mixture nut threads on SU H6 carbs).
Randall
59 TR3A
Pat wrote:
>
> As my project car has more than a few rusted bolt threads... I'm going to
> have to do alot of cleaning of them. I figure the best way to clean them out
> is to run a tap (?) through them.
>
> What are the common sizes please ? Such as fender bolts etc.
>
> Thanks all.
> Pat
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