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tightening duration can be reached in less
than 0.5 Sec. Therefore, work with low RPM
and switch the tool off immediately when the
screw is tight and the impacting sound can
be heard.
For screwing larger, longer wood screws into
hard material, pre-drilling is the best method.
Tightening Torque
The tightening torque depends on the dura-
tion of the impacting/tightening action.
The largest tightening torque is achieved af-
ter approx. 6 to 10 Sec. impacting/tightening
action.
The torque build-up depends on the follow-
ing factors:
• Hardness of the bolts/nuts.
• Type of washer (disk washer, spring wash-
er, seal).
• Hardness of the material to be joined.
• Lubricating effect at the surfaces of the
junction.
This leads to the following application cases:
Hard joining application: The joining of met-
al to metal with a disk washer. The maximum
torque is reached after a relative short im-
pacting/tightening action.
Medium joining application: The joining of
metal to metal when using spring ring wash-
er, disk spring washer, stud bolts or bolts/
nuts with conical seats.
Soft joining application: The joining of e.g.
metal to wood or insulation material.
For middle or soft joining cases, the maxi-
mum tightening torque is less than for hard
cases. Therefore, a longer impacting/tighten-
ing action is necessary to arrive at the maxi-
mum tightening torque.
Fastening with Screws
(Fig. 11)
The procedure shown in (Fig. 11) will help to
fasten materials together with your tool and
will reduce the possibility of stripping, split-
ting or separating the material.
First, clamp the pieces together and drill the
first hole 2/3 the diameter of the screw. If
the material is soft, drill only 2/3 the proper
length. If it is hard, drill the entire length.
1605A002J3 GDR18V-1950C 202404.indd 19
Operating Instructions
FASTENING
WITH SCREWS
1. Drill 2/3 diameter and
Second, unclamp the pieces and drill the
second hole the same diameter as the screw
shank in the first or top piece of wood.
Third, if flat head screw is used, countersink
the hole to make the screw flush with the sur-
face. Then, simply apply even pressure when
driving the screw. The screw shank clearance
hole in the first piece allows the screw head
to pull the pieces tightly together.
Driving Nuts and Bolts
Use variable speed control with caution for
driving nuts and bolts with socket attach-
ments. The technique is to start slowly, in-
creasing speed as the nut or bolt runs down.
The nut or bolt is set when the socked comes
to a stop.
Note: Ensure that no metal particles enter
the power tool. After working at a low speed
for an extended period, you should operate
the power tool at the maximum speed for
approximately three minutes without load to
cool it down.
Cold Weather Use (32°F)
Due to the lubrication used in the impacting
mechanism, the tool should be run for three
minutes at no load prior to actual usage. This
will warm the lubricant and provide better
performance.
2/3 of screw length for
soft materials, full
length for hard
materials.
Apply a slight
even pressure
when driving
screws.
2. Drill same
diameter as
screw shank.
3. Countersink
same diameter
as screw head.
Screw
Fig. 11
19
4/15/24 8:48 AM
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