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|  MIL-A-12560H (MR)
w/INT. AMENDMENT 4
procuring activity shall be notified. A check list shall be completed and submitted with each
ballistic test plate.
4.5 Examination.
4.5.1 Visual. All steel plate shall be subject to visual inspection for compliance with the
requirements for surface conditions (see 3.2.10 .1), edge quality (see 3.2.10.3 and 3.2.10.4) and
identification marking (see 3.2.8).
4.5.2 Dimensions. All steel plates shall be subject to inspection for compliance with dimensional
and tolerance requirements (3.2.7). Each class 3 armor plate shall be divided into one foot
squares painted on one surface and the results of each thickness measurement shall be painted in
the square in which it was taken.
4.5.3 Preparation for shipment. Examination shall be made to determine compliance with the
requirements for preparation for shipment (see section 5).
4.6 Tests.
4.6.1 Chemical analysis. Chemical analysis shall be conducted in accordance with the applicable
method specified in ASTM A751 (see 6.6). The analysis shall comply with the declared
composition established in accordance with the requirement of table I (see 3.2.2).
4.6.2 Hardness tests. Brinell hardness tests shall be conducted in accordance with either ASTM
E10 or ASTM E110 using a 10 mm carbide ball and a 3000 kilogram load. Surface scale and
decarburization shall be removed from the areas where the tests are to be made. Hardness tests
shall be made on the surfaces of pieces cut from the plate after heat treatment.
TABLE IX. Ballistic test plate sizes and corresponding test projectiles for first article and
acceptance testing.
Minimum size 1/ of test
Test projectile and
Nominal thickness range,
plates, inches
obliquity
inches
0.25 to 0.565 incl.
12 x 36
Cal .30 M2 AP at 0
0.566 to 1.125 incl.
12 x 36
Cal .50 M2 AP at 0
1.126 to 2.750 incl.
12 x 36
20 mm M602 APIT at 0
2.751 to 3.500 incl.
60 x 60
90 mm M82 APC at 45
3.501 to 3.999 incl.
60 x 60
90 mm M82 APC at 30
4.00 to 6.250 incl.
60 x 60
90 mm M318A1 AP at 0
Over 6.251 2/
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---
1/ Other sizes may be submitted for the convenience of the manufacturer if approved by the
Armor Vulnerability Division, USACSTA, Aberdeen Proving Ground.
2/ No ballistic test required.
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