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VIII. SPECIFICATIONS
MAIN UNIT
Model EY7840 EY78A1
Motor voltage
14.4 V DC 14.4 V DC 18 V DC
Maximum drilling
diameter
Concrete
16.5 mm
For work that can be completed with one battery pack
(
12.5 mm - 16.5 mm)
Steel
13 mm
Wood 18 mm
Speed at no load(RPM) 0~1000 rpm 0~1250 rpm
Blows rate per minute(BPM) 3800 bpm 3800 bpm 4750 bpm
Weight
(
with batter
y
p
ack:EY9L44
)
2.45 kg 2.45 kg -
Weight
(
with batter
y
p
ack:EY9L45
)
2.45 kg 2.45 kg -
Weight
(
with batter
y
p
ack:EY9L50
)
- - 2.6 Kg
Weight
(
with batter
y
p
ack:EY9L51
)
- - 2.6 Kg
Overall length
249 mm
Noise,Vibration
See the included sheet
GUIDELINE TABLE
• Select the torque for fastening screws with the clutch handle.
• Guide for the selection of torque
Depending on the job, adjustments are possible in five levels by approximately 1 N·m (10
kgf-cm) increments.
Setting Torque
Guide Depending on Material
Co
n
c
r
ete
Bl
oc
k
(A) (B) (A) (B)
Fastening
Screws
1 A
pp
roximatel
y
1.5 N·m
(
15 k
g
f-cm
)
2 A
pp
roximatel
y
2.5 N·m
(
25 k
g
f-cm
)
3 A
pp
roximatel
y
3.4 N·m
(
35 k
g
f-cm
)
4 A
pp
roximatel
y
4.4 N·m
(
45 k
g
f-cm
)
5 A
pp
roximatel
y
5.4 N·m
(
55 k
g
f-cm
)
Drilling
Holes
(Drill Mark)
Approximately 14.4 V: 12.5 N·m (127 k
g
f-cm)
18 V: 13.5 N·m (138 k
g
f-cm)
Drilling holes in wood and metal
(A) For fastening screws into plastic anchor which requires dia. 6.0 mm prehole in the concrete.
(B) For directly fastening screws into concrete (like topcon) with dia. 3.5 mm prehole.
NOTE: This is only a rough guide. Required torque is different depending on the
shape, material, and application of the screws.
Set according to the work environment of the site.
20


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