MIL-DTL-18240F
materials and processes, and which are considered subject to the same failure. Acceptance and
shipment of the product shall be discontinued until corrective action, acceptable to the inspection
activity has been taken. After corrective action has been taken, Group B inspection shall be
repeated on additional sample units (all tests and examinations, or the test which the original
sample failed, at the option of the qualifying activity). Groups A and B inspections may be
reinstituted; however, final acceptance and shipment shall be withheld until the Group B
inspection has shown that the corrective action was successful. In the event of failure after
reinspection, information concerning the failure shall be furnished to the cognizant inspection
activity and the qualifying activity.
5. PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified in
the contract or order (see 6.2). When actual packaging of material is to be performed by DoD
personnel, these personnel need to contact the responsible packaging activity to ascertain requisite
packaging requirements. Packaging requirements are maintained by the Inventory Control Point's
packaging activity within the Military Department or Defense Agency, or within the Military
Department's System Command. Packaging data retrieval is available from the managing Military
Department's or Defense Agency's automated packaging files, CD-ROM products or by
contacting the responsible packaging activity.
6. NOTES.
(This section contains information of a general or explanatory nature that may be helpful,
but is not mandatory).
6.1 Intended use. The self-locking elements covered by this specification are intended to be
incorporated in external screw threads to be used in applications where maximum temperature
does not exceed 250°F. When these self-locking elements are incorporated in external threads
and are used in compliance with MS15981, all the configurations of figure 1 are interchangeable
Type N element, plug/pellet configuration is intended to be installed via a hole drilled into the
fastener. Type L element, strip configuration is intended to be installed via a strip cut through the
threads parallel to the length of the fastener. Type P element, patch configuration is intended to
be installed without removal of any material of the fastener.A specific type should be specified
only when required by design or application requirements. The prevailing-torque values given in
this specification are conformance requirements for self-locking elements and apply only to the
combination of test conditions described in the locking torque test procedure. If the conditions of
the actual service application differs from those of 4.4.2 (e.g. internally threaded hole in a
different material, length of thread engagement, class of internal thread tolerance, speed of
driving, different plating or coating on screw or mating part) the prevailing-torque values may
vary. Such values can only be determined through testing the locking element in its application.
The plug/pellet is not recommended for sizes below .190.
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