Scott wrote:
That is the answer I was looking for (a quote from AC 43.13)...I can't
find my copy. Now, can you define "friction drag" ? If I know what
that is, I'll have 'er whipped! Thanks!

Scott

Friction drag is the drag exerted by the locking feature of the
nut, whether it's a nylon ring or a crimped metal collar. The amount of
torque required to turn the nut on the threads before any tension is
put on the bolt is added to the torque spec so that the proper tension
is achieved in the bolt (or stud). It can be critical especially with
all-metal locknuts; they are pretty tight on the threads.

Dan