When changing the DIN standards for tapping screws to ISO standards, some head heights and head diameters have been changed. The head geometry corresponds to cross recessed screws as the head type is identical. There are no DIN standards for these screws. In recent years, hexalobular screws (TX) have been introduced additionally. Please observe that according to DIN 74 these countersunk head screws have got F-type countersinks. However, DIN 7991 has been replaced by the ISO standard 10642. There are no successor ISO standards up to now. In Germany, established product standards such as DIN 6912 or DIN 7984 are still valid. Only in cases with very little space for installation, it is necessary to observe the changes in details. These changes may not have any effects on most of the applications. When introducing the ISO standards for small screws, some of the head heights and head diameters have been changed. DIN standards that begin with “DIN V” (“Vornorm”, meaning “pre-issue”) are the result of standardization work, but because of certain reservations on the content or because of the divergent compared to a standard installation procedure of DIN, they are not yet published standards. DIN standards are still valid for products having no ISO or EN standards. National standards (DIN) will be/have been largely replaced by international/European standards. DIN stands for “ Deutsches Institut für Normung“, meaning “German institute for standardisation”.
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