2-32 GENERAL / FASTENERS
ICON A5 / MAINTENANCE MANUAL CHANGE C3
2.20.12 Fabricated Cable Assemblies
Swage-type terminals, including Nicopress® products, shall be installed per AC43-13.1B, Chapter 7,
section 7-148.
NOTE: Specifications within specific inspection or maintenance tasks in
this manual take precedence over the general specifications given
here.
2.20.13 Torque Procedure and Fastener Torque Values
Nuts and bolts shall be tightened to the Final Torque values given in the tables below. Nuts and bolts
shall be tightened to the Final Torque values given in the table below, unless otherwise specified. In
general, shear torques are used throughout the aircraft so as to limit clamping loads that could damage
composite materials. Torque shall be applied to the nut, with the bolt head held motionless if possible.
The torque required to run the nut down to a seated condition (run-on or friction drag torque) shall be
added to the base torque for the application and the Final Torque shall be the final requirement.
Final Torque = Base Torque Specification + Run-On Torque
NOTE: Jam nuts (e.g. AN316 checknuts) should be torqued between the
Min and Max values in Table 2-3 (no run-on allowance).
Tab l e 2- 3 : Torque values for bolt and lock nut. All values given are in-lb
f
.
Thread
MIN
To r q u e
Given by
AC43.13-
1B for
Shear
Type
MAX
To r q u e
Given by
AC43.13-
1B for
Shear
Type
New Fasteners, No
Lubrication
Reused Locknuts, Lubrication
Required
Run-On
To r q u e
Final
To r q u e
Run-On
To r q u e
Final
To r q u e
30% of
New
Fastener
Run-On
To r q u e
#8-36 7 9 4.3 12.3 4.1 12.1 1.3
#10-32 12 15 7.3 20.8 4.4 17.9 2.2
1/4-28 30 40 8.9 43.9 8.4 43.4 2.7
5/16-24 60 85 10.2 82.7 10.8 83.3 3.0
3/8-24 95 110 15.2 117.7 18.2 120.7 4.6
7/16-20 270 300 N/A N/A 37.0 322.0 11.1
1/2-20 290 410 N/A N/A 48.5 398.5 14.6
9/16-18 480 600 N/A N/A 60.0 600.0 18.0
5/8-18 600 780 N/A N/A 105.0 795.0 31.5
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