Tightening Torque - Panasonic EY7270 Operating Instructions Manual

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)
60
(612)
40
(408)
20
(204)
12
Tightening time (Sec.)
EY7270(EU).indb 11
(EY771 only)
M16
M14
M12
M10
3
- 11 -
N • m
(k f-cm) M8, M10, M1, M14 High tensile bolt
g
165
(1683)
140
(1428)
120
(1224)
100
(1020)
80
(816)
60
(612)
40
(408)
20
(204)
12
Tightening time (Sec.)
Washer
Bolt
Steel plate
thickness 10 mm (3/8")
Washer
Nut
Spring washer
Tightening conditions
* The following bolts are used.
Standard bolts: Strength type 6.8
High tensile type 1.9
Explanation of the strength type
Bolt yield point
(80% of tensile strength)
48 k f/mm (68000 psi)

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

g
2006/05/25 13:25:06