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Farmall A draw bar bolt size

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Could anyone please tell me what the thread size is on the forward draw bar bolts on a 1947 A? These are the ones in the blind holes. I need to get a tap to clean up rust and dirt from the threads before I try to run bolts in the holes.

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I am thinking they were 5/8" coarse but it is a while since I have had mine apart 

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4 hours ago, mrfred54 said:

X2.  that's what they are in my Super A

That's also what a 464 loader mounting holes are so IH must have used the same bolt size and thread count for many years. Another plus for IHC.

Long bolts I get from McMaster, locally Tractor Supply has shorter grade 8 in stock. 

Good luck with your projects!

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