Panasonic EY7541 - Manual (Page 12)

N-JT
(ktf-cm) M8, MIO. M12, MU High tensile boll
Tightening time (Sec.)
Bolt-
cnv-
Washer
7777 Steel plate
Nut
nfX'Was
LJ ' Sorf
thicknesslO mm (3/8")
Washer
Spring washer
Tighteriing conditions
• The following ix>lls 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/mm2 (45000psi)
—, Bolt tensile strength
40 kgf/mm^ (seOOOpsi)
4) Tightening conditions
• Tightening torque vwli 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) Effectof 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.
Use Panasonic original Optional Quick change
chuck (EY9HX110E) for maximum performance.
2) Tightening time
Longer tightening time results in increased
tightening torque. Excessive tightening,
however, adds no value and reduces the
iffe of the tool.
3) Different bolt diameters
The size of the bolt diameter affects the
tightening torque.
Generally, as the bolt diameter increases,
tightening torque rises.
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