| 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.
ADJUSTABLE
& REUSABLE |
Tests have proven that fasteners with locking
elements may be removed and reused 5 to 15 times without evidence
of substantial alteration. |
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COST EFFECTIVE |
There are no lockwashers, nut or other loose parts to purchase,
inventory or assemble - saving between 20% - 40% in assembly
costs. |
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DEPENDABLE |
Locking elements are made in a variety of nylons, polyesters
and sealants having various levels of hot/cold applications
and capabilities. |
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| 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. |
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PATCH |
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. |
|
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360° |
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. |
|
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STRIP |
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. |
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PELLET |
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. |
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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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