12
Bnx-end,
Op
en-
end
and Combination
Wr
enches
Box-end and open-end wrenches arc available in
set
s or
separa tely in a variety of sizes. The size number stamped
near the end refers
10 the distance between the
two
parallel
flats on the hex head bolt or nut.
Box-end wrenches are usually superior to open-end
wrenches. Open-end wrenches
grip the nut on only two
flats. Unless a wrench fits well.
it may slip and round
off
the points on the nut.
The
box-end wrench grips on all six
flats. Both e-poim and lz-poim openings on box-end
wrenches are avai lable.
The
e-poin
t gives
supe
rior hold-
ing power; the 12-point allows a shoner swing radius.
Combination
wrenches (f igure 23) are open on one
side
and
boxe
d on the other. Both ends are the same size.
Adj usta ble
wre
nches
An ad
jus
table wrench fils a variety
of
nuts or bolt heads
(
F
i
~ u
r e
24). However, it can loosen and slip, causing
damage to
the nut and possibly causing injury. Use an ad-
justable
wrench only when other wrenches are not avail-
able.
Adjustable
wrenches come in various sizes.
Sucket
wr
enches
This
type is undoubtedly the fastest, safest and most
f25\
convenient to usc. Sockets that attach to a ratchet handle
\::J
(Figure 25) are available with 6-point or 12-point open-
ings and
114
, 3t
H,
1/2 and 3/4 in. drives (f igure 26). The
drive size indicates
the size
of
the square hole that mates
with the ratchet
handle.
To rque w rench
A torque wrench
(Fi
l-:
un' 27) is used with a socket to
measure how tightly a nut or bolt is installed. Torque
wrenchescome in a wide price range and indifferent drive
sizes. The drive
size is the size
of
the square drive that
mates with the
socket.
Imp
act
nrf
vcr
This tool makes removal of tight fasteners easy and
eliminates damage to bolts and screw slots. Impact drivers
and interchangeable bits (Ffgure 28)are available at most
large hardware stores, tool suppliers and motorcycle deal-
ers. Sockets can also
be used with a hand-impact driver.
However, make sure the socket is designed for impact use.
Do not usc regular hand sockets, as they may shatter.
CHAPTER
ONE
I{)
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