All the Fasteners are Made to Performance Standards
Robert:
Whether it's a nut plate, an all-metal locknut, or a nylon insert locknut, there are manufacturing and performance standards that ensure that they function correctly not only in terms of strength, but also in terms of torque performance. The latter is tested by running the fasteners together in a test jig and measuring the torque needed to overcome the locking feature (1st on), and then the removal torque needed to disassemble the joint (1st off). The same fasteners are cycled on and off until the 5th removal, which is also measured. This ensures that the lock is still working properly after repeated use. Adding locktite to a joint that already has a mechanical lock may make the joint hard to disassemble or even cause you to overstress the fasteners. Bottom line, make it to plan and it will work as it should.
Terry