Kobalt KIW 124B-03 Manual page 14

OPERATING INSTRUCTIONS
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 tightening 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 tightening torque. A
worn socket (wear on the hex end or square end) will cause a reduction in the tightening
torque.
• Bolt
– Although the torque coefficient and the class of bolt may be the same, the proper
tightening torque will differ according to the diameter of the bolt. Although the diameters
of bolts may be the same, the proper tightening 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
tightening force of the impact wrench somewhat. Compensate by tightening 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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