Yamaha MM700A, Manual, Page: 16 / 282

10 CHAPTER ONE
As with wrenches, a 6-point socket provides supe-
rior-holding ability, while a 12-point socket needs to be
moved only half as far to reposition it on the fastener.
Sockets are designated for either hand or impact use.
Impact sockets are made of thicker material for more du-
rability. Compare the size and wall thickness of a 19-mm
hand socket (A, Figure
14)
and the 19-mm impact socket
(B). Use impact sockets when using an impact driver or
air tools. Use hand sockets with hand-driven attachments.
WARNING
Do not use hand sockets with air or impact
tools, as they may shatter and cause injury.
Always wear eye protection when using
im-
pact
or air tools.
Various handles are available for sockets. The speed
handle is used for fast operation. Flexible ratchet heads in
varying lengths allow the socket to be turned with varying
force, and at odd angles. Extension bars allow the socket
setup to reach difficult areas. The ratchet is the most ver-
satile. It allows the user to install or remove the nut with-
out removing the socket.
Sockets combined with any number of drivers make
them undoubtedly the fastest, safest and most convenient
tool for fastener removal and installation.
Impact Driver
An impact driver provides extra force for removing fas-
teners, by converting the impact of a hammer into a turn-
ing motion. This makes it possible to remove stubborn
fasteners without damaging them. Impact drivers and in-
terchangeable bits (Figure 15) are available from most
tool suppliers. When using a socket with an impact driver
make sure the socket is designed for impact use. Refer to
Socket Wrenches, Ratchets and Handles in
this section.
WARNING
Do not use hand sockets with air or impact
tools as they may shatter and cause injury.
A l w a y s
wear eye protection when using im-
pact or air tools,
Allen Wrenches
Allen or setscrew wrenches (Figure 16) are used on fas-
teners with hexagonal recesses in the fastener head. These
wrenches come
in L-shaped bar, socket and T-handle
types. Use a metric set when working on most vehicles.
Allen bolts are sometimes called socket bolts.
Torque Wrenches
A torque wrench is used with a socket, torque adapter or
similar extension to tighten a fastener to a measured
torque. Torque wrenches come in several drive sizes
(1/4,
3/8, 12 and 3⁄4 and have various methods of reading the
torque value. The drive size is the size of the square drive
that accepts the socket, adapter or extension. Common
methods of reading the torque value are the deflecting
beam
(A, Figure 17), the dial indicator (B) and the audi-
ble click (C).