MIL-DTL-18240F
3.5.1 Self-locking element. The self-locking element shall be identified by color code as
identified in ASTM D1535 and in table VIII.
3.5.2 Color. Each manufacturer of the products specified herein shall color code their
self-locking elements produced per this specification in accordance with their designated colors
identified per QPL-18240.
3.6 Workmanship. Workmanship shall be consistent with high-grade commercial practice.
Parts are required to be free of burrs and slivers except slight burrs are permissible in the area of
the self-locking element provided maximum locking torque values specified in table II are not
exceeded.
4. VERIFICATION
4.1 Classification of inspections. The inspection requirements specified herein are classified
as follows:
a. Qualification inspection (see 4.2).
b. Quality conformance inspection (see 4.3).
4.1.1 Responsibility of the self-locking element supplier. The self-locking element supplier
shall be responsible for compliance with all the requirements of sections 3 and 4. The seller of the
completed fastener shall be responsible for proving that the fastener product has met all the
quality conformance inspections of the completed fastener.
4.2 Qualification inspection. Qualification inspection shall be performed at a laboratory
acceptable to the Government on sample units produced with equipment and procedures normally
used in production. Qualification inspections shall be as specified in table VII. Qualification
inspection shall be limited to the fasteners shown in tables IV and shall be authorized only upon
presentation of certified test reports to the activity responsible for qualification. The test reports
shall include actual results of all the tests and a drawing which shows the location, size, material,
method of attachment and protrusion of the self-locking element for each diameter upon which
qualification is desired. A manufacturer's designation shall be submitted for the locking element
to be used in each diameter of fastener. For qualification of sizes up to and including .500"
(government designation 80), the manufacturer must submit samples for full testing to be
conducted by the qualifying test facility for each individual desired size. For qualification of sizes
above .500" nominal diameter size, the manufacturer must submit actual torque test data and
samples of the specific size to the qualifying testing facility and must be qualified to the .500"
nominal diameter size.
4.2.1 Retention of qualification. Certification shall be requested by Naval Air Warfare
Center from each manufacturer and forwarded to the preparing activity for those specifications
which do not contain a requirement for retention of qualification by testing. Certification shall be
at the time of the two year review and shall be signed by a responsible official or management,
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