
151Ammunition Design Practice
r
d
i
F
d
o
The location where these
stresses are the greatest
is here along the contact
FIGURE 4.20
Denition of load radii.
r
d
o
i
t
2
t
1
F
2
F
1
Nut (2)
d
i
=Inner diameter
1
d
o
=
2
FIGURE 4.21
Loading diagram of buttress threads.
4
F
4
FIGURE 4.22
Loading of a thread surface.