TM 9-243
HOW TO USE A BOX WRENCH
Select the size of wrench that fits the nut or bolt.
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
continuously 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 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
leverage. 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.
25-14
