A Machine screw has a cylindrical shaft, threaded its entire
length, and fits into a nut or a tapped hole. Several different
head styles are offered:
Round Combo are the same as round
head except for the option of using either a slotted or Phillips
A pan head screw protrudes above the surface of
the material to be fastened.
Flat head screws are countersunk
into the material for a smooth surface area.
Flat undercut (slotted) heads are supplied to provide larger usable thread. Head
height of undercut screws is approximately two-thirds that of
standard screws. Drive depths are reduced proportionately.