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Half Nuts DIN 439 Stainless Steel Sizes: M3, M4, M5, M6, M7, M8, M10. Pack of 10 and 20 Units What is A2 Stainless Steel? A2 stainless steel is commonly referred to as 18-8 since it contains 18% chromium and 8% nickel. A2 is an authenticate stainless steel and is nonmagnetic. These nuts can be tightened using a spanner, socket wrench as well as by hand. In addition, these nuts can also be used with bolts, screws and washers