Panasonic EY7546LR2S Operating Instructions Manual page 13

EY7550
M10 x 35 mm M12, M14, M16 x 45 mm
N m
(kgf-cm)
Tightening time (Sec.)
EY7550
M8, M10 x 35 mm. M12 x 45 mm
N m
(kgf-cm)
Tightening time (Sec.)
EY7551
M10 x 35 mm M12, M14, M16 x 45 mm
N m
(kgf-cm)
Standard bolt
High tensile bolt
Standard bolt
EY7551
M8, M10 x 35 mm. M12 x 45 mm
N m
(kgf-cm)
Tightening time (Sec.)
Bolt
Nut
Tightening conditions
• The following bolts are used.
Standard bolts: Strength type 4.8
High tensile type 12.9
Explanation of the strength type
4.8
Bolt yield point
80
( % of tensile strength)
32
kgf/mm
Bolt tensile strength
40
kgf/mm
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 coefficient (the fixed coefficient indi-
cated by the manufacturer upon produc-
tion).
Tightening torque will vary, even with
the same bolting material (e.g. steel),
accord ing to the surface finish.
High tensile bolt
Washer
Steel plate
thickness 10 mm (3/8")
Washer
Spring washer
2
(45000 psi)
2
(56000 psi)