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CAUTION
● Gradually adjust torque setting dial from low torque to high
torque to prevent over loading.
○ Tightening torque varies depending on tightening condition such as
condition of bolt/nut, surface condition of steel, length of extension
cord, voltage use and etc.
○
Tendency shown as below:
Tightening Condition
Tendency
- When connection is soft (gasket, rubber, glass & etc in
between the steels)
- When bolt length is extremely long,
- When bolt grades are under 8.8 or 10.9
- When friction coefficient of the bolt is high
- When bolt or washer is stripped during tightening
- When voltage is higher than rated voltage of the wrench
Tightening torque
becomes LOW
- When connection is hard
- When bolt diameter is large
- When bolt length is short
- When water or oil is adhered on the bolt
- When tightened bolt is tightened again (over tightened)
- When voltage is lower than rated voltage of the wrench
Tightening torque
becomes HIGH
- When gaps between the connection is large
Result in imprecise
tightening
CAUTION
●
Never re-tighten the same bolt/nut that has once
successfully installed (never over tightened the same
bolt/nut).
Failure to follow this instruction may result in breakage of the bolt/nut,
malfunction, personal injury or loss of torque precision.