MIL-DTL-12560K (MR)
requirements specified herein, except ballistic tests (see 4.2.1), unless disapproved by the
Government. The Government reserves the right to perform or check any of the inspections set
forth in this specification where such inspections are deemed necessary to assure supplies and
services conform to prescribed requirements and to determine the validity of the certifications.
4.2.1 Ballistic testing facility. Unless otherwise specified in the contract or purchase order (see
6.2), the ballistic test plates shall be forwarded to the Commander, USA ATC, ATTN: TEDT-
AT-SL-V, Building 358, 400 Colleran Road, APG, MD 21005-5059 or to an approved
Government facility for ballistic testing for first article or production acceptance.
4.3 Lot. A lot shall consist of all production and ballistic test plates of the same melt of steel, of
the same thickness, having the same treatment, and heat treated with the same thermal cycle in
the same production furnace(s) in the same facility. When specified by the procuring activity
(see 4.3.1 and 6.2), production and ballistic test plates shall be allowed to be heat treated
separately. The test plate shall be heat treated in a production furnace.
4.3.1 Separately heat treated ballistic test plate. When the procuring activity allows a ballistic test
plate to be heat treated separately from the production plates it represents (see 4.3), it shall be so
stated in the data (see 6.6).
4.4 First article inspection. When required (see 6.2), the first article samples submitted in
accordance with 3.1 shall be examined for all the provisions of this specification applicable to
end item examination and shall utilize the same requirements and test methods as the production
acceptance inspection shown in 4.5.
4.4.1 First article tests. First article tests shall consist of all the tests specified in 4.8.
4.4.2 First article ballistic test. Unless otherwise specified (see 3.1, 6.2, and 6.5), the first article
ballistic test shall not be required provided (a) the manufacturer, within 37 months, has produced
acceptable plates within the same nominal thickness ranges of Table VI, and (b) the production
conditions are the same as for previously accepted plates. A supplier who has previously met the
first article requirements shall furnish the procuring activity the firing record of the ballistic test
plate and other pertinent data relative to compliance with first article. Neither first article nor
acceptance ballistic tests shall be required for plates ordered to thicknesses of more than 6.25
inches. Acceptance of these thicker plates shall be based on meeting the other requirements of
the specification.
4.5 Production acceptance inspection. The acceptance examination under 4.7 and the tests under
4.8 shall serve as a basis for the acceptance of individual production lots.
4.6 Sampling.
4.6.1 First article sampling.
4.6.1.1 Chemical composition. One sample for chemical analysis shall be taken from near each
plate selected for the ballistic tests.
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