Each of the types of non-metallic locking elements has sufficient locking qualities to lock and stay locked whether properly seated or not. Keep these advantages in mind when considering which type of locking device to use in your design.

Tests have proven that fasteners with locking elements may be removed and reused 5 to 15 times without evidence of substantial alteration.
There are no lockwashers, nut or other loose parts to purchase, inventory or assemble - saving between 20% - 40% in assembly costs.
Locking elements are made in a variety of nylons, polyesters and sealants having various levels of hot/cold applications and capabilities.
Below are listed the four styles of locking elements. A brief explanation of each will aid you in design considerations for your application requirements. Locking devices may be applied in any location you prefer for your special designs.
The patch method is sprayed directly onto fasteners that have been heated to a prescribed temperature for ultimate adhesion. They require not curing time after patching process and can be installed immediately.
The 360° type of locking is a permanent encapsulated adhesive that is applied completely around the diameter of the fastener. It works of the concept of a chemical reaction rather than depending on a metal to metal wedging lock.
Strips are inserted into an area milled parallel to the body of the screw. The resilient insert creates a metal to metal wedge locking action opposite the side of the strip.
A plug is inserted into a drilled hole from the major thread diameter toward the center of the fastener. One full starting thread is allowed between the pellet and the end of the fastener. The projection of the pellet on 1/4" diameter fasteners and larger is approximately .010 + .003". Remember to allow for this hole clearance in the designing stages.

All locking elements above meet with the strict requirements of MIL-F-18240 most recent revision.

NOTE: It is recommended that mating threads of a tapped hole be countersunk 90° - 100° by .025" larger than the major diameter of the fastener to ensure the best locking torque.

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