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Larry Jenkins · 07-24-2015, 03:18 PM

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

07-24-2015, 03:18 PM	#1
Larry Jenkins BANNED Join Date: Feb 2015 Location: East Central Iowa Posts: 1,275	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