Draker
Well Known Member
AC43.13 talks about nylon locknut "prevailing torque" which is the torque from the locking mechanism that must be overcome when attaching them to bolts. This amount must be added to the specified torque value for the bolt. I've found empirically, that simply tightening a nylon locknut to the bolt's specified torque is insufficient (the torque wrench "clicks" before the bolt even snugs down). How can I measure this extra torque that will be needed, both to get the bolt snug, then to tighten it properly? Is there a special tool needed to do this, or is there a rule of thumb given the fastener type + size? Is this value going to be different for each individual lock nut??