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 - Show Coverage: Journey to Ankeny - by Cindy Ladage. We left Illinois on the first day of July and headed north and west for Ankeny, Iowa. Minus two kids, we traveled light with only the youngest in tow. As long as a pool was at the end of our destination she was easy to please unlike the other two who have a multitude of requirements to travel with mom and dad. Amana Colonies served as a respite where we ate a family style lunch that sustained us with more food than could reasonably fit into our ample physiques. The show at Ankeny
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