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7-5. Number of Screws or Bolts Driven
7-5-1. Per-charge working capacity comparisons
Test data on the number of screws or bolts which can be driven per battery charge by the new models vs. the
previous models are shown in the tables below. Please note that the data below are intended for general
reference only as the number of screws which can be tightened per charge will vary slightly depending on screw
tightening conditions, screw sizes, ambient temperatures and the charging capacity of the battery.
(1) Number of screws or bolts driven (Cordless impact driver)
Tightening condition
Battery
Wood screw 4.0 mm dia. x 50 mm
(soft wood)
Wood screw 4.2 mm dia. x 90 mm
(hard wood)
Wood screw 5.3 mm dia. x 120 mm
(hard wood)
Machine screw
(M8 x 16 mm)
Note 1) The Model WH 12DM is equipped with the larger hammer and the higher power motor for the higher
tightening speed. Although the higher tightening speed is realized, the Model WH 12DM has the
following disadvantage.
High startup current
The Model WH 12DM consumes higher power than C for driving a short or machine screw because it
requires high startup current. Thus the number of machine screws driven per charge is different as
shown above.
(2) Ordinary bolt (Cordless impact wrench)
Tightening condition
Battery
Number of bolts
M10 (3/8")
Time (sec.)
ordinary bolt
M12 (15/32")
Number of bolts
ordinary bolt
Time (sec.)
M14 (9/16")
Number of bolts
ordinary bolt
Time (sec.)
Model
HITACHI
WH 12DM
EB 1220BL
575
115
45
1,280
Model
HITACHI
WR 12DM
EB 1220BL
755
0.4
475
0.6
335
0.9
HITACHI
WH 12DH
EB 12B
545
110
40
1,215
HITACHI
WR 12DH
EB 12B
755
0.5
475
0.8
335
1.2
--- 24 ---
C
1222
(Corresponding EB 1220BL)
635
105
40
1,475
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