Hitachi WR 9DM, WR 12DM manual Nut

English

<For WR9DM>

kgf•cm			N•m
torque	800	80
	600	60
Tightening
	400		40
	200	20
	0	00

M8 ⋅ 30

High tension bolt

Ordinary bolt

1 2 3

kgf•cm N•m

	1000	100
torque	800	80
	600	60
Tightening
	400	40
	200	20
	0	0
		0

M10 ⋅ 30

High tension bolt

Ordinary bolt

1 2 3

kgf•cm N•m

	1000	100
torque	800	80
	600	60
Tightening	200	20
	400	40
	0	0
		0

M12 ⋅ 45

High tension bolt

Ordinary bolt

1 2 3

Tightening	time: sec	Tightening	time: sec	Tightening	time: sec
(Steel plate	thickness	(Steel plate	thickness	(Steel plate	thickness
t = 10 mm)		t = 10 mm)		t = 25 mm)

Bolt

Steel plate thickness t

Nut Fig. 18

Fig. 17

*The following bolt is used. Ordinary bolt: Strength grade 4.8 High tensile bolt: Strength grade 12.9

(Explanation of strength grade:

4 — Yield point of bolt: 320 N/mm2 {32.6 kgf/mm2} )

8 — Pulling strength of bolt: 400 N/mm2 {40.8 kgf/mm2}

<For WR12DM>

	kgf•cm N•m		M16 ⋅	55 F10T (tighening time 3 sec)
	1600	160						a
torque
	1200	120
			When full recharged
Tightening
	800	80
	400	40
		When completely discharged
	0	0
		0	20	40	60	80	100	120	140

Number of tightenings (PCS)/charging

Fig. 19

13