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ISO 898-1 Area of Stress

ISO 898-1 Area of Stress

ISO 898-1 Area of Stress

Looking for a bit of clarification in regard to thread stress area. I am finding two formulars for calculating area of stress in a threaded bolt, One is directly from ISO 898-1 as which includes
A_s,nom which relates the difference in the thread pitch diameters of the internal and external threads. Another which I am seeing in multiple sources and referencing ISO is A_shear = 0.5*pi*Le*(D-0.65*P) which includes engagement length.
The sources with this second formula are:

Whiles these are referencing ISO, I cannot find this formular within ISO 898-1. Is it found within other sections i.e. 898-X?

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