7. Stresses due to External Forces,
Not Prestressed, Bolt Carrying Tensile Load
Now from Table 11.1, find the value of the nominal
diameter of bolt corresponding to the value of dc
8. An eye bolt is to be used for lifting a load of 60 kN. Find the
nominal diameter of the bolt, if the tensile stress is not to
exceed 100 MPa. Assume coarse threads.
Given : P = 60 kN = 60 × 103 N ; σt = 100 MPa = 100 N/mm2
load on the bolt (P)
From Table 11.1 (coarse series), the nearest
standard core diameter (dc) is 28.706 mm and
the corresponding nominal diameter ( d ) is
33 mm → thread M33
9. Shear in thread due to axial load P (shear stress at surface of
cylinder of bolt core, along loaded thread)
10. Compression at the bearing surface of thread
d = major diameter
dc = core (minor diameter)
n = number of working thread
s = thread pitch
