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Table 1 Example of Tightening Mode Switching Function
Indicator Lamp
Max Speed
Max Impact
Rate
Applications
OPERATIONAL CAUTIONS
1. Confirm the line voltage (Fig. 5)
The available tightening torque is in-
fluenced by line voltage. Reduced line
voltage lowers the available tightening
torque.
For example, if you use a 120 V type
wrench on a 110 V line the available
tightening torque will be reduced to 70
to 90%. When extending the power
cord, use an extension cord which is
as short as possible. When the line volt-
age is low and a long extension cord is
needed a step up transformer should
be used. The relation between the line
voltage and the tightening torque are
shown in the figures.
2. Do not touch the bumper or hammer case during continuous operation
The bumper and hammer case become hot during continuous screw tightening
so be careful not to touch them at that time.
3. Work at a tightening torque suitable for the bolt under impact
The optimum tightening torque for nuts and bolts differs with material and size
of the nuts and bolts. An excessively large tightening torque for a small bolt
may stretch or break the bolt. The tightening torque increases proportionally to
the operating time. Use the correct operating time for the bolt.
10
Low
Medium
1,100/min.
1,300/min.
1,300/min.
1,500/min.
[Light Tasks]
Including the assembly of
piping support structures,
scaffolding, racks,
fences and furniture
High
1,400/min.
1,700/min.
[Heavy Tasks]
Including steel frame assembly
ft-lbs (N . m)
M16 × 55 (F10T)
295 (400)
Rating 120V
221 (300)
148 (200)
74 (100)
0
0
2
4
Tightening time
Fig. 5
Maximum
1,600/min.
1,900/min.
110V
(s)
6
8
10
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