MIL-DTL-12235A (MR)
4.3.5 Mechanical properties. The number of tension specimens that shall be tested shall be
specified in the contract or purchase order (see 6.2) and shall meet the requirements when tested
as specified in 4.4.5.
4.3.6 Inspection equipment. The examination and tests shall be made using equipment approved
by the Government.
4.4 Test methods.
4.4.1 Material composition. Chemical analysis for conformance to the material composition
requirements of 3.1.1 and 3.1.2 shall be conducted on the sample in accordance with ASTM
A751.
4.4.2 Hardness. The test specimens shall be prepared and tested in accordance with ASTM E18
and shall be in compliance with the hardness requirement of 3.1.1.3.
4.4.3 Rotating band tests.
4.4.3.1 Seating test.
4.4.3.1.1 Methods for plate-proofing projectiles other than 20-mm M1005 and 105-mm M1004.
One band per 2,000 shells from each banding machine (or where production is less than 2,000
per working shift, one band from each banding machine from each shift) shall be removed for
examination of the seating. Prior to removal, the diameter of the finished band shall be
measured on at least three diameters 60o apart and on at least two points along the length of the
cylindrical portion, near the front and rear (a minimum of six diametral measurements). These
points of measurements shall be marked on the bands as well as the orientation of the band on
the shot. After removal, the thickness of the band shall be measured at each of the marked points
(twelve measurements) and the diameter of the band seat shall be measured opposite those
points. To the diameters of the band seat at each point, the corresponding sum of the two
thicknesses of the band shall be added and the results subtracted from the corresponding exterior
diameter of the band previously determined. The results shall indicate the total diametral
clearance between the band and its seat. If the band is well seated, a negative clearance or
interference may be indicated on some of the measurements or even on the average of all
measurements. In case the indicated clearance thus determined is greater than 0.006 inches on
any one diameter, either front or rear, the band shall be removed from ten additional shells from
the group represented. If a clearance greater than 0.006 inches on any one diameter is indicated
on any one of these additional shells, the entire group represented shall be rejected subject to re-
banding and retest. When wavey band seat ribs or irregular band profiles inter-fares with ease of
measurement, the manufacturer is authorized to machine the outside of the band in order to
obtain an adequate cylindrical surface. The diameter of the machined band must exceed the
bourrelet diameter.
4.4.3.1.2 Methods for plate-proofing projectiles for the 105-mm M1004. A hydraulic press
having one movable ram, capable of exerting a total ram pressure of 12,000 pounds minimum,
shall be used for this test. Two indentors (or anvils) of rectangular cross section 0.378 inches on
a side each having a face radius of 2.11 inches shall be provided, one on the fixed and one on the
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