Definition
A plastic plug made hollow
plastic tube split half its length
to allow for expansion. The plastic plug is
inserted into the hole and tapped home until level with the surface of
the masonry. Tightening
the bolt draws expanding bolt
inside the split iron shell, forcing the
iron expand and grip the masonry. 14. Wood screws may screwed directly into
wood but when fixing brick, stone, plaster concrete necessary to
drill hole the masonry material, which then plugged with material
to which the screw can secured. Each size plastic plug colour coded match a
wood screw size.
Definition
The most well known expansion bolt
is made Rawlbolt and consists of
a split iron shell held together one
end steel ferrule and spring
wire clip the other end.
PLASTIC PLUGS
A plastic plug made hollow plastic tube split half its length to
allow for expansion.37
Screw fixing plastic plug. Each size of
plastic plug colour coded match
a wood screw size.
Rawlbolts are for heavy-duty masonry
fixings.
EXPANSION BOLTS
The most well known expansion bolt made Rawlbolt and consists of
a split iron shell held together one end steel ferrule and spring
wire clip the other end.
.
A hole drilled into the masonry, using masonry drill the same diam-
eter, the length the plastic plug (see Fig. Tightening the bolt draws expanding bolt
inside the split iron shell, forcing the iron expand and grip the masonry.Electrical installations and wiring systems
323
When heavier cables, trunking, conduit luminaires have fixed a
screw fixing often needed.
Rawlbolts are for heavy-duty masonry fixings (see Fig.38).38
Expansion bolt fixing.
Drill hole masonry Insert plug Drive home screw
Fixture
FIGURE 14.
Drill hole in
masonry
Tighten bolt
until fixture is
secure
Fixture
Insert shell and
ferrule hole
and attach fixture
with bolt
Fixture
Shell
Ferrule
Expanding nut
FIGURE 14. Finally, the fixing screw driven into the plastic plug until it
becomes tight and the fixture secure.37). 14
