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Old 06-01-19, 11:39
David Herbert David Herbert is offline
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Join Date: Mar 2010
Location: Ayrshire, Scotland - previously Suffolk
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Please note that the thread will not be either UNF or UNC ! They hadn't been standardized then but were based on AF and AC standards which were the ones in use in WW2 USA. Most threads are effectively the same but not 1" fine which these bolts might be (Sherman ones are 1" AF). 1" AF is 14tpi and UNF is 12 tpi so they will not fit together. There is another smaller size that is different too but I can't remember what it is now - I blame it on dementia !
David
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