Kobalt KRAIW 124B-03 Manual page 11

OPERATING INSTRUCTIONS
9. Tighten Fasteners with the Angle Impact Wrench
WARNING: Battery tools are always in operating condition. Therefore, always remove the
battery pack when not in use or carrying at your side.
The proper fastening torque may differ depending on the type or size of the bolt, the material of
the workpiece to be fastened, etc. Before starting your job, always perform a test operation to
determine the proper fastening time for your bolt or nut.
a. Check the direction-of-rotation selector (B) for the correct setting (forward or reverse).
b. Hold the tool firmly and place the socket over the bolt or nut.
c. Depress the variable-speed trigger switch (C) to turn the angle impact wrench on. The
variable speed trigger switch delivers higher speed with increased trigger pressure and
lower speed with decreased trigger pressure.
d. Fasten the bolt or nut to the proper torque.
e. To turn the angle impact wrench OFF, release the variable-speed trigger switch.
f. After fastening, always check the torque with a torque wrench.
NOTICE: Hold the tool straight along the axis of the bolt or nut.
NOTICE: Excessive fastening torque may damage the bolt/nut or socket.
Practice with various fasteners, noting the length of time required to reach the desired torque.
Check the tightness with a torque wrench. If the fasteners are too tight, reduce the impacting
time. If they are not tight enough, increase the impacting time.
The fastening torque is affected by a wide variety of factors, including the following:
• Socket: Failure to use the correct size socket will cause a reduction in the fastening torque.
A worn socket (caused by wear on the hex end or square end) will cause a reduction in the
fastening torque.
• Bolt: Although the torque coefficient and the class of bolt may be the same, the proper
fastening torque will differ according to the diameter of the bolt. Although the diameters
of bolts may be the same, the proper fastening torque will differ according to the torque
coefficient, the class of bolt, and the bolt length.
• The use of a universal joint or an extension bar (both sold separately) will reduce the
fastening force of the impact wrench somewhat. Compensate by fastening for a longer
period of time.
• The manner of holding the tool or the material to be fastened will affect the torque.
Loosening Fasteners
The torque that is required to loosen a fastener averages 75% to 80% of the tightening torque,
depending on the condition of the contacting surfaces. However, if rust or corrosion causes
seizing, more torque may be required
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