Mooney M20M - Page 16

MOONEY
AIRCRAFT CORPORATION M20M
SERVICE
AND
MAINTENANCE
MANUAL
FLARE NUT
TORQUE
VALUES-
Tighten
to
minimum
torque
value
for
appropriate
size
as
shown
(Figure
5-1).
CAUTION
These
torque
values
are
derived from
oil-free
cadmium-plated
threads.
FITTING
SIZE
ALUMINUM
TUBING.
STEEL TUBING
MINIMUM MAXIMUM
MINIMUM
MAXIMUM
-3
30
70
-4
40
65
50
90
-5
60
80
70.
120
-6
75
125
90.
150
-8
150 250
155
250
-10
200
350
300
400
-12
300
500
430
575
-16
500
700
550
750
-20
600
900
-24
600
900
FLARE NUT
TORQUE
FIGURE
5-1
METRIC
BOLTS,
SCREWS NUTS TORQUE
VALUES
Failure of
threaded fasteners
due
to
over-tightening
can occur
by
bolt
shank fracture
or
by
stripping
of the
nut
and/or
bolts thread.
A
bolt
or
screw
assembled
with
a
nut
of
the
appropriate
class
is
intended
to
provide
an
assembly
capable
of
being tightened
to
the
bolt
proof
load without
thread
stripping
occurring.
The
torque
value
to
be
set
for
a
particular
size of
screw
is
dependent
upon:
1)
Material
of
the
screw.
2)
Parent
material
(steel,
non-ferrous metal
or
plastic).
3)
Whether the
screw
is
untreated
or
plated.
4)
Whether
the
screw
is
dry
or
lubricated.
5)
The
depth
of the thread.
TIGHTENING TORQUES
Untreated
Screw(Black Finish)
Friction
Coefficient
0. 14
NOMINAL
5.6
8.8
PROPERTY 10.9
12.9
DIAMETER
CLASS
(Coarse Thread)
Nm/ft.lb.
Nmm.lb.
TORQUE
Ma
Nm/ft.lb.
Nmm.lb.
M3
0.60/0.44
1.37/1.01
1.92/1.42
2.30/1.70
M4
1.37/1.01
3.10/2.29
4.40/3.25
5.25/3.87
M5
2.70/1.99 6.15/4.54
8.65/6.38
10.417.6
Ms
4.6/3.3
10.5/7.7
15/11
18/13
M7
7.6/5.6
17.5/1
2.9
25/1
8.4
29/21.3
M8
26/19
36/26
43/31
M10
22/16 51/37
72/53
87/64
M12
39/28
89/65
125/92
150/110
M14
62/45
141/103
198/146
240/177
M16
95/79
215/158
305/224
365/269
M18
130/95
295/217
420/309
500/368
M20
184/1
35
420/309
590/435
71
0/523
M22
250/1
84
570/420
800/590
96onos
M24
31
5/232
725/534
1020/752
1220/899
M27
470/346
1070/789
1510/1113
1
810/1334
M30
635/468 1450/1
069
2050/1
511
2450/1
806
M33
865/637 1970/1
452
2770/2042
3330/2455
M36
1111/819 2530/1
865
3560/2625
4280/31
56
M39
1440/1062 3290/2426 4620/3407
5550/4093
5-20-01
4-99
OLDWILLWAYNE