TM 9-243
HOW TO USE A BOX WRENCH
1 Select the size of wrench that fits the nut or bolt.
2
Place the wrench (1) on the nut or bolt (2). Swing the
wrench clockwise to tighten and counterclockwise
to loosen for a right hand threaded nut or bolt.
Reverse the above for a left hand threaded nut or
bolt.
3 If there is insufficient room to swing the wrench in a
full circle, lift it completely off the nut when it comes
to the limit of the swing, and place it in a new
position, permitting another swing. A swing through
of a 15 degree arc is usually sufficient to continu-
ously loosen or tighten a nut or bolt.
4
After the nut is tight, give it a final tightening.
USING A SOCKET WRENCH
1
Select the size of socket (1) that fits the nut or bolt to
be turned and push it onto the handle (2) which is
best suited to the job.
2
If there is room to swing, use the ratchet handle.
(The handle may be made to ratchet in one direction
for tightening work and in the other direction for
loosening work.)
3 Swing the handle back and forth to turn the nut in the
25-14
desired direction. (The socket need not be raised
from the nut at the end of each swing.)
4 When a tight nut is to be loosened or a nut is to be
set up, the nut hinged handle (3) can be swung at
right angles to the socket to provide the most lever-
age. At the point where the nut turns easily, the
handle can be swung to a vertical position and
twisted rapidly between the fingers in the same
manner as a screwdriver.
