Panasonic EY7270 Manual De Instrucciones página 11

Factors Affecting
Tightening Torque
The tightening torque is affected by
a wide variety of factors including the
following. After tightening, always check
the torque with a torque wrench.
1) Voltage
When the battery pack becomes nearly
discharged, the voltage decreases and
the tightening torque drops.
Bolt Tightening Conditions
N • m
(k f-cm)
M10, M1, M14, M16 Standard bolt
g
165
(1683)
140
(1428)
120
(1224)
100
(1020)
80
(816)
M10
60
(612)
40
(408)
20
(204)
12
Tightening time (Sec.)
N • m
(k
g
(1683)
(1428)
(1224)
(1020)
(816)
(EY771 only)
(612)
(408)
M16
(204)
M14
M12
Bolt
Nut
Tightening conditions
* The following bolts are used.
Standard bolts: Strength type 6.8
High tensile type 1.9
3
Explanation of the strength type
) Tightening time
Longer tightening time results in
increased tightening torque. Excessive
tightening, however, adds no value and
reduces the life 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.
- 11 -
f-cm) M8, M10, M1, M14 High tensile bolt
165
140
120
100
80
60
40
20
12
Tightening time (Sec.)
Washer
Steel plate
thickness 10 mm (3/8")
Washer
Spring washer
Bolt yield point
(80% of tensile strength)
48 k f/mm (68000 psi)

g
Bolt tensile strength 60 k
(85000 psi)
(EY771 only)
M14
M12
M10
M8
3
f/mm

g