Tightening conditions
Factors Affecting TightenÂ
? The following bolts are used.
ing Torque Standard bolts: Strength type 4.8
High tensile type 1.9
The tightening torque is affected by a wide
variety of factors including the followings. Explanation of the strength type
After tightening, always check the torque 4.8
with a torque wrench.Bolt yield point
1) Voltage(80% of tensile strength)
3 kgf/mm (45000psi)
When the battery pack becomes near-
ly discharged, the voltage decreases and Bolt tensile strength
the tightening torque drops.40 kgf/mm (56000psi)
Bolt Tightening Conditions) Tightening time
Longer tightening time results in increased
N?mM1035 mm M1, M14, M16 45 mm
tightening torque. Excessive tightening, how-
(kgf-cm)Standard bolt
ever, adds no value and reduces the life of
196.0
(2000)the tool.
M16
3) Different bolt diameters
147.0The size of the bolt diameter affects the tight-
(1500)ening torque.
M14Generally, as the bolt diameter increases,
98.0tightening torque rises.
(1000)4) Tightening conditions
M12
Tightening torque Tightening torque will vary, even with the
49.0same bolt, according to grade, length, and
(500)M10torque coefficient (the fixed coefficient indi-
cated by the manufacturer upon produc-
tion).
0.00.51.01.52.02.53.0 Tightening torque will vary, even with the
Tightening time (Sec.)same bolting material (e.g. steel), accord-
ing to the surface finish.
N?mM8, M1035 mm M145 mm
(kgf-cm) Torque is greatly reduced when the bolt
High tensile bolt
196.0and nut start turning together.
(2000)
5) Socket play
Torque is lowered as the six-sided configu-
147.0ration of the socket of the wrong size is
(1500)
used to tighten a bolt.
M126) Switch (Variable speed control trigger)
98.0
Torque is lowered if the unit is used with
(1000)
Tightening torquethe switch not fully depressed.
M107) Effect of Connecting Adaptor
49.0
(500) The tightening torque will be lowered
M8
through the use of a universal joint or a
connecting adaptor.
0.00.51.01.52.02.53.0
Tightening time (Sec.)
Washer
Bolt
Steel plate
thickness10 mm (3/8")
NutWasher
Spring washer
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ACEC
PANASONIC
