MAX PJID143 - Manual (Page 17)

17
• When operating the tool continuously us-
ing a spare battery pack, allow the machine
to rest for approximately 15 minutes before
starting operation with the spare.
If the above is not observed, the motor, trigger
switch and other parts may burn out.
8. REFERENCE VALUES FOR
SCREW / BOLT FASTENING
(TIGHTENING TORQUE)
The appropriate torque for a screw/bolt differs
according to the material and size of the screw/
bolt, and the material being screwed. The follow-
ing figures show the relation between torque
tightening screws/bolts and operating time. Re-
fer to them and optimize your operating time.
∗ The following bolts are used.
Standard bolt: Strength category 4.8
High-tensile bolt: Strength category 12.9
• Small screws should be tightened by ad-
justing the amount that the trigger switch is
pulled.
• Because excessively long operating peri-
ods may stretch or break small screws, be
sure to check the operating time and tight-
ening torque before starting operation.
• Tighten with the tool lined up straight with
a screw.
Tightening the screw with the tool at an angle
to the screw will prevent the transmission of
the correct level of torque produced by the tool.
Doing so can also damage the head of the
screw, and cause the tip of a bit to wear down.
• Use a bit that matches the head of the
screw.
• The maximum tightening torque of this tool
was measured when a M14 high-strength
bolt (strength category: 12.9) was tightened
for 3 seconds. Note that this measurement
condition is outside of the tool specifica-
tions.
CAUTION
Bolt
Steel plate
Nut
Strength category
4 . 8
Bolt yielding point (80% of tensile strength)
314 N/mm
2 (32 kgf/mm 2 )
Bolt tensile strength 392 N/mm 2 (40 kgf/mm 2 )
Standard bolt
Fastening time (second)
Fastening torque
Fastening torque
Fastening time (second)
High-tensile bolt
CAUTION
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