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Calculate shear stress in a pin or axle under point load.
Applied force
$$ F_N = 70000 \:
N $$
Number of shear planes
$$ n_{sp} = 1 \:
$$
Shear stress
$$ \tau_{shear_{circle}} = {{F_N \over \left({ A_{circle_{d_{mm}}} \cdot n_{sp} }\right)}} \:, MPa $$