TM 9-243
TYPES AND USES - Continued
SOCKET WRENCHES
The socket wrench consists of a round metal sleeve with
a square opening in one end for insertion of a handle,
and a 6-point or 12-point wrench opening in the other.
They are available in both common (short) and deep
(long) lengths. The length of the socket does not deter-
mine its size. Socket wrenches usually come in sets.
The square or drive end may vary in size from 1/4 to 1
inch. In socket sets, the drive end determines the size;
for example, a 1/4-inch drive set may contain nine sock-
ets ranging in size from 3/16 inch through 1/2 inch. In
3/8-inch drive, the smallest socket would be 3/8 inch.
This overlap in size allows better control by the user and
prevents breakage of either the socket or the equipment
from using the wrong size handle.
A universal joint socket and spark plug socket are
examples of specially designed sockets. The universal
joint socket is used when it is necessary to reach around
an object. The spark plug socket has a rubber insert.
This insert protects the ceramic insulator when remov-
ing and/or installing the spark plug.
All sockets must be used with some type of handle.
Sockets are used to remove and/or install common-size
nuts or bolts.
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