MIL-DTL-13931J
steels not acceptable (See 6.3). Unless otherwise specified, castings are not acceptable. A list of
standard SAE/AISI steels based on drawing call-outs has been provided for informational purposes only
(see 6.5).
3.2.2 Material soundness. Parts shall be free from cracks and fractures as determined by the specified
examination or test (see 4.5.22 and 4.7.3).
3.2.2.1 Magnetic-particle indication. Magnetic-particle indications shall be defined as lineal
discontinuities.
3.2.3 Strategic storage material.
3.2.3.1 Corrosion protection of surface. Forgings and castings procured for strategic storage shall have
a preservative material applied to all surfaces to minimize corrosion during the period of storage.
3.2.3.2 Rotation of stored material. Forgings and castings in strategic storage should be periodically
withdrawn to fill current cannon manufacturing requirements and replaced by newly procured material.
3.3 Design.
3.3.1 Dimensions. If dimensions additional to those specified on the applicable drawings are considered
by the contractor to be required, or if two or more dimensions appear to be in conflict, the contractor shall
request clarification from the Procuring Contracting Officer. Drawings shall not be scaled to obtain
dimensions.
3.3.1.1 Interpretation. Dimensions and tolerances shall be interpreted in accordance with the standard
that was current at the time the drawing was originally prepared. For drawings revised prior to 30
September 1991, the revised dimensions and tolerances only shall be interpreted in accordance with the
standard that was current at the time of revision, unless otherwise specified on the drawing. For drawings
revised after 30 September 1991, the revised dimensions and tolerances shall be interpreted in accordance
with the standard that was current at the time of original drawing preparation, unless otherwise specified
on the drawing. Where a unilateral tolerance is specified without showing that the variation in the other
direction is zero (e.g. 0.123 + 0.004) the unstated tolerance is zero and the general tolerance shall not
apply. Where features are not controlled in accordance with the applicable standard(s) the requirements
of drawing B8769390 shall apply. All features depicted as symmetrical to a centerline, without locational
dimensions, are considered to have a common axis or center plane.
3.3.1.2 Dimension to coated surfaces. The dimensions and tolerances for coated surfaces given on the
applicable drawings shall apply as follows:
a. Organic coatings (paint, varnish, lacquers, etc.,) Phosphate coatings, and Solid Film
Lubricant Coatings - Dimensions and tolerances shall apply without coating.
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