Panasonic EY7542LN2L Operating Instructions Manual page 14

M8, M10 x 35mm. M1 x 45mm
N ⋅ m
(kgf-cm)
150
100
50
M6
0.0 0.5
Tightening time (Sec.)
Bolt
Nut
Tightening conditions
• The following bolts are used.
Standard bolts: Strength type 4.8
High tensile type 1.9
Explanation of the strength type
4.8
Bolt yield point
(80% of tensile strength)
3 kgf/mm
Bolt tensile strength
40 kgf/mm
) Tightening time
Longer tightening time results in in-
creased 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 in-
creases, tightening torque rises.
Bolt Tightening Conditions
High tensile bolt
(Bolt size: Millimeters)
M12
M10
M8
1.0 1.5 2.0 2.5
Washer
Steel plate
thickness10 mm (3/8")
Washer
Spring washer
 (45000psi)
 (56000psi)
M10 x 35mm. M1, M14, M16 x 45mm
N ⋅ m
(kgf-cm)
150
100
50
0.0
3.0
4) Tightening conditions
Tightening torque will vary, even with
the same bolt, according to grade,
length, and torque coefficient (the fixed
coefficient indicated by the manufac-
turer upon production).
Tightening torque will vary, even with
the same bolting material (e.g. steel),
according to the surface finish.
Torque is greatly reduced when the
bolt and nut start turning together.
5) Socket play
Torque is lowered as the six-sid-
ed configuration of the socket of the
wrong size is used to tighten a bolt.
6) Switch (Variable speed control trigger)
Torque is lowered if the unit is used
with the switch not fully depressed.
7) Effect of Connecting Adapter
The tightening torque will be lowered
through the use of a universal joint or
a socket adapter.
• Universal joint
• Socket adapter
- 14 -
Standard bolt
M12
M10
M8
M6
0.5 1.0 1.5 2.0
Tightening time (Sec.)
M14
2.5 3.0