Figure 2-7.Hi-lok fastener.
cadmium-plated alloy steel with protruding or
100-degree flush heads. Collars for the pins are made
of anodized 2024-T6 aluminum or stainless steel.
The threaded end of the pin is recessed with a
hexagon socket to allow installation from one side.
The major diameter of the threaded part of the pin has
been truncated (cut undersize) to accommodate a
0.004-inch maximum interference-free fit. One end
of the collar is internally recessed with a 1/16-inch,
built-in variation that automatically provides for
variable material thickness without the use of washers
and without fastener preload changes. The other end
of the collar has a torque-off wrenching device that
controls a predetermined residual tension of preload
(10%) in the fastener.
The jo-bolt, shown in figure 2-8, is a high-
strength, blind structural fastener that is used on
difficult riveting jobs when access to one side of the
work is impossible.
The jo-bolt consists of three
factory-assembled parts: an aluminum alloy or alloy
steel nut, a threaded alloy steel bolt, and a
corrosion-resistant steel sleeve.
The head styles
available for jo-bolts are the 100-degree flush head,
the hexagon protruding head, and the 100-degree
flush millable head.
Turnlock fasteners are used to secure panels that
require frequent removal. These fasteners are
available in several different styles and are usually
referred to by the manufacturers trade name.
CAMLOC FASTENERS.The 4002 series
Camloc fastener consists of four principal parts: the
receptacle, the grommet, the retaining ring, and the