DIN 126 is a German technical standard that specifies the dimensions and tolerances for hexagon head bolts and screws with metric threads. It is part of the DIN 931 series of standards, which covers various types of bolts and screws used in mechanical engineering and construction. The standard includes specifications for the thread size, length, diameter, and other dimensions of the bolts and screws, as well as tolerances for these measurements. It also provides guidelines for the marking and packaging of these fasteners. DIN 126 was first published in 1928 and has been revised and updated several times since then to ensure compatibility with modern manufacturing techniques.

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