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07-24-2015, 03:18 PM
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BANNED
Join Date: Feb 2015
Location: East Central Iowa
Posts: 1,275
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Old time metallurgy.. Or metallurgist.
Most axle nuts have threads that are not perfect. I contacted one of the premier Model A parts houses and they said theirs are Grade 5.
I think the originals are somewhat harder than the modern Grade 5 designation. More like Grade 8. Does any one know the original hardness specification in terms of modern hardnesses? Rockwell C? Larry |
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