You can view a table of resultant forces in both tightened and not tightened bolts
and nuts.
Bolts
For bolts, the following forces are evaluated in the cross-section at the base of the
bolt head in location #1:
Axial force
Shearing force
Bending movement
as well as the corresponding nuts at location #2:
Axial force
Thread shear force
Bending movement (about centroid of bolt threads.
Figure 1.
For blind bolts, the second group of forces are evaluated in the centroid of the
threads at the bottom of the bolt.
Nuts
In nut tightening (where a corresponding bolt is not present), the following forces
are evaluated in the nut threads:
Thread shear force
Bending movement (about centroid of bolt threads)
Thread shear force is the total force that acts on the nut threads along nut axis.
This force defines the main failure mode of threads through shear and can be used
for threads sizing. In particular case of a bolt which can freely slide in the
placement holes and is tightened by a nut, the force will be same as axial force on
the bolt.
