A large number of failures in mechanical engineering is due to damage to axles and shafts. The most frequent cause for this is fatigue failure (fatigue fractures, vibration fractures). In addition to the optimum structural design, the calculation of the safety against the occurrence of fatigue failure and damage due to maximum load (permanent deformation, precrack) presents a necessary measure. This standard applies for the safety proof of shafts and axles in accordance with DIN 743-1 in the fatigue strength range (vibration or fatigue fractures) as well as in the time and fatigue strength range at a load indicated by load spectrum. This standard has been prepared by Working Committee NA 060-34-32 AA "Wellen und Welle-Nabe-Verbindungen" ("Shafts and shaft to collar connections") at the Technical Section Power transmission engineering of the Mechanical Engineering Standards Committee (NAM) at DIN, the German Institute for Standardization e. V. The DIN 743 standard series - Shafts and axles, calculation of load capacity - consists of - Part 1: General basics; - Part 2: Theoretical stress concentration factors and fatigue notch factors; - Part 3: Strength of material; - Part 4: Fatigue limit, endurance limit - Equivalently damaging continuous stress; - Supplement 1: Examples to Part 1 to 3; - Supplement 2: Examples to Part 4.