MIL-DTL-18240F
attesting that the listed product(s) is still available from the listed plant, and is produced under the
same conditions as originally qualified; i.e., same process, materials, construction, design,
manufacturer's part number, or designation, and meets the requirements of the current issue of the
specification. Failure to provide the certification will be cause for removal from the QPL.
4.2.2 Sampling instructions. The qualification inspection samples shall consist of 60
fasteners with the self-locking elements conforming to table IV for each diameter for which
qualification is desired. All test nuts necessary for the inspections shall conform to tables VA and
VB and shall be furnished by the manufacturer. Samples shall be identified as required and
forwarded to the activity designated in the letter of authorization from the activity responsible for
qualification (see 6.3).
4.3 Quality conformance inspection. Prior to installation of the self-locking element, the
quality conformance inspections of the applicable fastener specification shall be met. In addition,
after installation of the self-locking element on to the applicable fastener, the quality conformance
inspections specified in table VI shall be met. Also, the self-locking fastener shall meet any other
tests which are considered necessary by the procuring activity to determine conformance with the
requirements of this specification. Any rework of the fastener as defined by the Fastener Quality
Act shall require retesting.
4.3.1 Sampling. For the quality conformance inspections specified herein, the sample self-
locking fasteners shall be selected at random from each finished lot as specified in 4.3.1.1. Group
A quality conformance inspection sampling shall be in accordance with ANSI/ASQZ 1.4-1993,
single sampling inspection, Level II, of zero acceptance level. Group B torque inspection sampling
shall be in accordance with the sampling plan in table IX orX at the supplier's option.
4.3.1.1 Lot. A lot shall consist of finished fasteners with the self-locking element
incorporated which are of the same diameter and length, fabricated by the same process, heat
treated in the same manner, and produced as one continuous run or order or part thereof,
whichever is of the smaller quantity.
4.4 Methods of inspection.
4.4.1 Examination of product. The self-locking fastener shall be examined for the following
items before any other tests are conducted..
a. Presence of self-locking element.
b. Location of self-locking element.
c. Dimensions of self-locking element.
d. Presence of burrs and slivers (see 3.6).
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