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: Central Illinois Strawberry Festival - by Cindy Ladage and Janna Seiz. Every year the coming of summer is highlighted by different events for different people. For some, it is heralded with the end of school, tilling the garden, or completion of the planting season. To us, connoisseurs of find food, antique tractors, farm toys, crafts, and downright fun, the annual Strawberry Festival means summer is here. Every year, in Carlinville, Illinois, the Macoupin County Historical Society and the Macoupin Agricultural Antique Association team up to fill th
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