GENERAL INFORMATION
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For stubborn or damaged fasteners, the 6-point
provides superior holding because it contacts the
fastener across a wider area at all six edges. For
general use, the 12-point works well. It allows the
wrench to be removed and reinstalled without moving
the handle over such a wide are.
An open-end wrench is fast and works best in
areas with limited overhead access. It contacts the
fastener at only two points and is subject to slipping if
under heavy force, or if the tool or fastener is worn. A
box-end wrench is preferred in most instances,
especially when braking loose and applying the final
tightness to a fastener.
The combination wrench has a box-end on one
end and an open-end on one end and an open-end on
the other. This combination makes it a convenient tool.
Adjustable wrenches
An adjustable wrench or Crescent wrench (Figure
6) can fit nearly any nut or bolt head that has clear
access around its entire perimeter. An adjustable
wrench is best used as a backup wrench to keep a
large nut or bolt from turning while the other end is
being loosened or tightened with a box-end or socket
wrench.
Adjustable wrenches contact the fastener at only
two points, which makes them more subject to slipping
off the fastener. Because one jaw is adjustable and
may become loose, this shortcoming is aggravated.
Make certain the solid jaw is the one transmitting the
force.
Socket Wrenches, Ratchets and
Handles
Sockets that attach to a ratchet handle (Figure 7)
are available with 6-point or 12-point openings (Figure
8) and different drive sizes. The drive size indicates
the size of the square hole that accepts the ratchet
handle. The number stamped on the socket is the size
of the work area and must the fastener head
As with wrenches. a 6-point provides superior-holding ability. While a 12-point socket needs to be
moved only half as for to reposition it on the fastener
Sockets are designated for either hand or impact use. Impact sockets are made of thicker material
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