These are the tools to measure and set the torque of the AN hardware:
To determine the friction drag I used a new bolt and nyloc nut and measured the torque required to rotate the nut when 1 thread is protruding:
|AC 43.13 torque range AN365 fine thread||inch/lbs||20-25||50-70||100-140|
|TAF maintenance manual (including friction drag)||inch/lbs||18-24||51-70||99-139|
|Measured friction drag torque||inch/lbs||5||7||12|
* AC4.13 max torque + (measured friction drag * 0.8 for torque wrench accuracy)
There’s an interesting movie on this topic: Homebuilt Help – How Accurate is your Hand for Torquing Bolts Properly?
On 1m37s it states to add 0.5 foot/lbs = 6 inch/lbs for the friction drag when using nyloc nuts; which is about the same I figured out when measuring the friction drag.
Update for NAS6603 bolts:
The Cirrus manual for the SR22 shows slightly higher torque values for the NAS6603 bolts:
Another nice article:
Kitplanes Torque Wrench Basics