USE/CARE OF HANDTOOLS & MEASURING TOOLS - OD1621 - LESSON 2/TASK 1
other end is called a 1/2 by 9/16 wrench.
The size of each opening is
usually stamped on the side of the wrench. The openings are from 0.005 inch
to 0.015 inch larger than the size marked on the wrench, so that they will
easily slip on bolt heads or nuts of that size.
Open-end wrenches are made in many different sizes.
Wrench sizes range
upward in steps of 1/32 inch, starting with 5/32 inch up to 1 3/4 inches.
The common open-end wrench is made with the ends at an angle of 10 to 23 to
the body of the wrench, so that the user can work in close quarters. Other
special open-end wrenches may have the ends at an angle of 45, 60, 75, or 90
degrees, or a combination of two angles.
The length of the wrench is determined by the size of the opening, since the
lever advantage of the wrench is proportional to its length; wrenches with
larger openings are made longer and heavier to increase leverage and
strength.
FIGURE 15.
OPEN-END WRENCHES.
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