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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 pulled out.
7) Effect of Connecting Adaptor
The tightening torque will be lowered through
the use of a universal joint or a connecting
adaptor.
EY6535(EU).book Page 12 Tuesday, March 1, 2005 9:36 AM