Agri Supply lists blades both in MM that is metric measure and by gage thickness so you could figure things from there. Blades were 11 gage on the older disks up to the 50's and some in the 60's. When heavier disks came around the blade thickness became a 9 gage to stand more of the ligher horsepower shock. Still later they went to a 7 gage for that same reason. Your particular disk probably came with 9 gage blades and probably 20" diameter but could have been orderaded with 18" or 22" blades but if the 22" they probably would be a 7 gage to have enough strength to handle the side load of the blade. On the older 40's-50's disks that were light weight that came with the 11 gage blades and you replaced them with 9 gage the disk would not as good as soon as factory edge was wore off because the extra thickness was more like trying to gut with a dull knife. If you are pulling with a high horsepower tractor at maximum speed and in rocky soil then get as thick as possible that wil fit in the length of axle and also between bearings. And if you get one with the star (2 size hole) a 1 1/8-1 1/4" should fit as on that age disk I don't think they had gone to bigger axles but the 1" axle was no longer being used when that disk was made. The earlier Kewanee disks used a 1 1/8" axle. There are 3 of the orignal Kewanee wheel disks setting that I would like to get if I can figure a way to swing the costs to rebuild and I do have a buyer ready for them if I can get it done and for those diske the correct blade would be a 1 1/8" axle 11 gage thickness and 18" diameter altho they probly came with 16" diameter blades as it was thought at that time the extra 2" was not worth the extra money and it was also thought wrongly that a 16" blade worked better and pulled easier. These disks if I can get it done will be pulled with 5 to 7 actual horsepower as in Belgin and at about a 2 1/2 mph. So those conditions you do not want a thick blade but one that will cut in and throw as much dirt as possible without putting excess angle to the gang. Your disk is designed to cut over twice as deep as these that do not need a furrow lever blade like yours do and that is the reason for the smaller blades on ends of back gang.
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