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Bolt
Nut
Washer
Steel plate
thickness10 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
(45000psi)
Bolt tensile strength
40 kgf/mm
2
(56000psi)
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.
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 trigger)
Torque is lowered if the unit is used with
the switch not fully depressed.
7) Effect of connecting adaptor
The tightening torque will be lowered
through the use of a universal joint or a
connecting adaptor.
VI
. ACCESSORIES
Use only bits suitable for size of drill’s chuck.
(EY9HX110E)
Use Panasonic original Optional Quick change chuck
(EY9HX110E) for maximum performance.
VII
. APPENDIX
MAXIMUM RECOMMENDED CAPACITIES
Model
EY7541
Bolt fastening
Standard bolt: M6 – M16
High tensile bolt
: M6 – M12
Screw driving
Wood screw
3.5 – 9.5 mm (1/8" – 3/8")
Self-drilling screw
3.5 – 6 mm (1/8" – 1/4")
13


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