Some manufacturers are putting more info on the packages now. All 7018 have an H rating, most are H4. The -1 basically means they have a little more strength/toughness than basic 7018 and the -A1 means it's done by adding .5% molybdenum. Some 7018 will say MR or LMP on the package. This stands for moisture resistant and low moisture pick up. Still a good idea to warm them in oven if they've been opened or could have been in a humid environment. What brand are they? They can pretty much be used anywhere you'd use 7018 or want something with the most strength.
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Today's Featured Article - Tractor Implements and Their Use - by Curtis Von Fange. Dad was raised during the depression years of the thirties. As a kid he worked part time on a farm in Kansas doing many of the manual chores. Some of the more successful farmers of that day had a new time saving device called a tractor. It increased the farm productivity and, in general, made life easier because more work could be done with this 'mechanical beast'. My dad dreamed that some day he would have his own tractor with every implement he could get. When he reached his early sixties
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