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 - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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