NL screw is designed with threads which generate force of repulsion when flank surfaces of the threads make contact with the internal threads. This force generates prevailing torque*1 and prevents loosening.
*1 The friction torque generated as pressure is applied resists loosening as a result of vibration.
Cost reduction is possible by eliminating adhesive agent. Also, by eliminating adhesive agent, it is eco-friendly.
Apply where looseness is prohibited. Replace current bolts with adhesive agent to NL bolts.