CHAPTER 20
PAGE 7
MAINTENANCE MANUAL EXTRA 300/SC
PAGE DATE: 15. January 2008
20-10-03 Torque Values
Nuts, except of counter nuts are mainly stop nuts according
to LN 9348 or selflocking nuts according to AN 363.
a) Standard torque values allowed for bolts and nuts accord-
ing to DIN and LN must be adhered to as follows:
b) Standard torque values allowed for bolts and nuts accord-
ing to AN and MS must be adhered to as follows:
Thread Size Torque Value
(Nm) (in.lbs)
1/4-28 3.4 - 4.5 30 - 40
5/16-24 6.7 - 9.5 60 - 85
3/8-24 10.7 - 12.5 95 - 110
7/16-20 30.5 - 33.9 270 - 300
1/2-20 32.8 - 46.3 290 - 410
9/16-18 88.1 - 67.8 480 - 600
I M P O R T A N T On all bolt connections, the specified torque and lock-
ing method must be observed. Do not reuse stop nuts if
they can be run up finger tight!
STANDARD PRACTICES AIRFRAME
Metric thread size Torque value
(Nm) (in.lbs)
Torque value
M4 1,8 16
M5 3.9-4.3 35-38
M6 6.2-6.8 55-60
M8 15.2-16.8 144-148
M10 29.5-32.5 261-287
M12x1.5 51-57 452-504
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