
Originally Posted by
spr1
Regarding a few of the earlier posts - the underlying reason that there is a specified, calculated torque range is to preload the assembly, such that the clamping force is greater than the anticipated loading (front, back, sideways, etc.). This preload prevents fatigue failures (repeated cyclic loading below the level of immediate failure leading to an eventual failure), excessive wear of the threads, loss of position, etc. Prevailing torque alone is not sufficient in high vibration environments to ensure that the assembly will maintain preload. That is where the stake comes in. If someone insufficiently torques the assembly, the best stakes on earth will not make any difference, as they add nothing to the mechanical strength of the joint/assembly.
My assumption as to the slightly different specified torques between rifle and carbine assemblies would be that the different methods of rotation control (rifle butt stock vs receiver plate) and or other applied loading assumptions made the math come out differently, and rather than just round down or up, being good engineers, if the calculations came out different, then by God, that's what the manual should require.
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