Panasonic EY6506 Operating Instructions Manual page 7

Bolt Tightening Conditions
M6, M8, M10, M12 x 25 mm (1") Standard bolt
M10 x 25 mm High tensile bolt
N m
·
(k f-cm)
88.3
(900)
M10 x 25 High tensile bolt
78.5
(800)
68.6
(700)
58.8
(600)
49.0
(500)
39.2
(400)
29.4
(300)
M8
19.6
(200)
9.8
(100)
M6
0
0.1 0.25 0.5 1.0 2.0 3.0 4.0
Tightening time (Sec.)
2) Tightening time
Longer tightening time results
in increased tightening torque.
Excessive tightening, how ever,
adds no value and reduces the life
of the tool.
3) Different bolt diameters
The size of the bolt diameter
affects the tight ening torque.
Generally, as the bolt diameter
increases, tightening torque rises
4) Tightening conditions
Tightening torque will vary, even
with the same bolt, according to
grade, length, and torque coef-
ficient (the fixed coefficient indi-
cated by the manufacturer upon
produc tion).
(Bolt size : Millimeters)
M12
M10
Bolt
Nut
Tightening conditions
* The following bolts are used.
Standard bolt: Strength type 4.8
High tensile type 12.9
Explanation of the strength type
4.8
Bolt yield point
(80% of tensile strength)
471 N/mm
Bolt tensile strength 588 N/mm
(60 k f/mm
Tightening torque will vary , even
with the same bolting material
(e.g. steel), accord ing to the sur-
face finish.
Torque is greatly reduced when
the bolt and nut start turning
together.
5) Socket play
Torque is lowered as the six-sided
configu ration of the socket of the
wrong size is used to tighten a bolt.
6) Switch (Variable speed control trig-
ger)
Torque is lowered if the unit is used
with the switch not fully pulled out.
7) Effect of Connecting Adaptor
The tightening torque will be low-
ered through the use of a universal
joint or a connecting adaptor.
- 7 -
asher
Steel plate
thickness 10 mm (3/8")
asher
Spring washer
2 2
(48 k f/mm )
2
)
2