Hex Flange DIN 6923 Nuts are hex nuts with machine screw threads on the inside and a circular flange that expands outwards from the hex top part. The nut's bearing surface can be smooth (non-serrated) or serrated (serrated). Serrations are tooth-like projections that bite into the mating surface, preventing the nut from loosening and requiring more effort to remove than to install. Because there is no prevailing torque, the nut spins freely until it touches the surface. Serrated nuts won't gall screw threads because thread deformation isn't used as a locking mechanism, but they will damage the mating surface. The large bearing surface can span holes that are misaligned, oddly shaped, or enormous.Hex flange bolts are usually used with them. Choose from Class 8 and 10 steel and stainless steel, as well as coarse, fine, and super fine threads, depending on the size. Zinc plated steel is available, as well as plain steel, which is unplated and prone to rust. For steel, plain finish and plated, and stainless steel, the thread tolerance is 6H; right-hand threads are standard. The nut's strength grade (Class) should always be equal to or greater than the screw's strength grade (Class). ISO 4161, JIS B1190, and ANSI B18.2.4.4M are equivalent to DIN 6923 Hex Flange Nuts.
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