MIL-DTL-13931J
a. Measure wall thickness continuously around the circumference of the tube at intervals prescribed
in the applicable QAP.
b. Maximum variation shall be reported for each point measured.
c. If a recorded variation exceeds the tolerance specified on the applicable drawing, measurements
in the chamber area shall be taken and reported one-inch intervals, and for the balance of the tube
at twelve-inch intervals.
d. If final readings exceed the tolerances specified on the applicable drawing, the tube shall be
rejected and submitted to the Procuring Contracting Officer for disposition.
4.5.12 Resubmission of rejected tubes. Noncompliance with plating or dimensional requirements shall
be cause for rejection of the tube. Such rejected cannon tubes may be resubmitted for Government
inspection after stripping and re-plating. For acceptance, resubmitted cannon tubes shall be subject to the
same inspections and requirements as the first submission.
4.5.13 Materials. Materials for parts shall be tested for compliance with the applicable specifications.
The test results shall be available to the Government representative. Certified test reports identifiable
with the material may, at the option of the Government, be accepted in lieu of tests. When the identity or
quality of the material is in doubt and valid and acceptable data is absent, tests shall be conducted within
the material specifications as required by the Government representative to determine the identity and
quality. If proven to be sub-standard, the material shall be rejected.
4.5.13.1 Identification of materials. The following parts shall carry positive identification through all
processes so that it is possible to determine the original source of the finished part. This record shall
include the name of the producer (or Cage code number), detail specification number, and pertinent
procedure data on the heat, ingot, lot, and other processing numbers.
a. Cannon tubes and tube members including liners, jackets, hoops and separate chamber sections.
b. Evacuator chambers.
c. Muzzle brakes and blast deflectors.
d. Breech rings, breech bushings and breech couplings.
e. Breechblocks.
f. Nozzle assemblies of recoilless rifles and guns.
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