It also depends on where the bolt came from. I have saw tests where a chinese grade 8 didn't have the strength of an American grade 5. I will probably put grade 8 fine thread in mine, just because I use mine heavily and I wont have to worry about the fine thread loosening up as easily while using it. A previous owner have put 2 course thread bolts with nylon lock nuts in the front and I was always having to tighten them back up. The other 2 original bolts in the front axle never gave any problems. My 175 is the same way, somebody put one course thread bolt in the front axle and the other 3 are original, that one course thread comes loose every now and again. I'm going to replace it also.
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Today's Featured Article - Madison's County - by Anthony West. Philip Madison has been a good friend of mine for quite some time. He has patiently suffered my incessant chit chat on the subject of tractors for longer than I care to remember, and on many occasions he has put himself out, dropped what ever it was he was doing, to come and lend a hand cranking handles, or loading a find onto a trailer. Although he himself has never actually owned or restored a tractor, he was always enthusiastic and always around helping with other peoples projects.
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