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Cordless Impact Wrench Operator's Manual 21
OPERATION CAUTIONS (CONTINUED):
Operation
Tightening time: sec
(Steel plate thickness
t = 1"/25 mm)
Tightening time: sec
(Steel plate thickness
t = 1"/25 mm)
Tightening time: sec
(Steel plate thickness
t = 3/8"/10 mm)
Fig. 17
Explanation of strength grade:
4 — Yield point of bolt: 45,500 psi (32 kgf/mm
2
)
8 — Pulling strength of bolt: 56,900 psi (40 kgf/mm
2
)
*The following bolt is used.
Ordinary bolt: Strength grade 4.8
High tension bolt: Hardness division 12.9
Fig. 16
Fig. 18
2000
(1736)
200