USE/CARE OF HANDTOOLS & MEASURING TOOLS - OD1621 - LESSON 2/TASK 1
several sizes; they may have a 1/4, 1/2, or 3/4 inch square drive to receive
socket wrenches, and the capacity may range up to 600 foot-pounds.
(5) Spanner Wrenches.
(a) Fixed Spanner Wrenches. Fixed spanner wrenches (figure 23 on
the following page) are used to turn flush type and recessed retaining
rings, cover plates, plugs, hose couplings, and parts which have holes or
slots for insertion of the wrench pins or lugs. Each fixed spanner wrench
is designed for a particular job.
(b) Adjustable Spanner Wrenches.
An adjustable face spanner
wrench (figure 23) has two legs joined together with a pivot pin. The legs
can be opened and closed, allowing the pins at the end of the legs to fit
the various distances between holes found in many types of cover plates and
Another type of adjustable spanner wrench, shaped like a hook, is
called an adjustable hook spanner wrench. The position of the hook can be
adjusted to fit different size couplings and other parts.
c. Using Wrenches.
(1) Open-End Wrenches. It is important for a wrench to be a snug fit
on a nut or bolt head. If it is too loose, the wrench will slip and round
the corners. Make certain that the wrench fits squarely on the sides of the
nut or bolt head, as