Supplement Airplane Maintenance Manual
Cessna 172 with TAE 125-02-99 / -114
AMM-20-02
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20-AMM-20-02
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06.11.2013
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4
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25.08.2014
20 STANDARD PRACTICES - AIRFRAME
20.00 GENERAL
DESCRIPTION
This chapter contains data about standard and special torque
values as well as the approved firewall sealants.
20.10 Standard Torque Values
This chapter only has data about standard threaded fasteners.
Always tighten the nut or bolt to the torque shown in the tables
below. Always use the correct locking device with the nut or bolt.
These tables show the correct torque values for bolts and nuts to
AN and DIN specifications. Use the following torque values for all
bolts, nuts and screws which meet the specifications unless they
are in the list of special torque values below.
Table 1: Tightening torques for set screws in accordance with VDI standard 2230
CAUTION: Discard self-locking nuts after removal. The friction torque
reduces with use.
Screw Size Property Class
Nm
(Loctite or similar)
Nm
(dry screw joints)
M4 8.8 3.0 4.1
10.9 4.6 6.0
M5 8.8 5.9 8.1
10.9 8.6 11.9
M6 8.8 10.1 14.1
10.9 14.9 20.7
M8 8.8 24.6 34.3
10.9 36.1 50.3
M10 8.8 48 68
10.9 71 100
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