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EY7551
M8, M10 x 35 mm. M12 x 45 mm
High tensile bolt
N s m
(kgf-cm)
Tightening torque
Tightening time (Sec.)
Bolt
Nut
Washer
Steel plate
thickness 10 mm (3/8")
Washer
Spring washer
Tightening conditions
• The following bolts are used.
Standard bolts: Strength type 4.8
High tensile type 12.9
4.8
Explanation of the strength type
Bolt yield point
(
80% of tensile strength)
32 kgf/mm
2
(45000 psi)
Bolt tensile strength
40 kgf/mm
2
(56000 psi)
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.
EY7550
M10 x 35 mm M12, M14, M16 x 45 mm
Standard bolt
N s m
(kgf-cm)
Tightening torque
Tightening time (Sec.)
EY7550
M8, M10 x 35 mm. M12 x 45 mm
High tensile bolt
N s m
(kgf-cm)
Tightening torque
Tightening time (Sec.)
EY7551
M10 x 35 mm M12, M14, M16 x 45 mm
Standard bolt
N s m
(kgf-cm)
Tightening torque
Tightening time (Sec.)