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MIL-A-12560H (MR)
w/INT. AMENDMENT 4
3.2.5.2 Impact. The Charpy V-notch impact test results of armor plate submitted shall meet the
requirements shown in table VI for the applicable hardness and thickness. The Charpy V-notch
impact specimens shall be obtained in the both the TL orientation (transverse to the major
direction of rolling with the notch perpendicular to the plate surface so that the crack propagates
in the longitudinal direction) and the LT orientation (parallel to the major direction of rolling).
The Charpy value for class 4 armor plate shall be greater than 20 ft-lb (27 J) for all thickness.
3.2.5.3 Bend test. When specified in the contract or order a bend test shall be performed. Bend
test criteria shall be agreed upon by the supplier and fabricator.
3.2.6 Ballistic requirements. Ballistic requirements for class 1, 3 and 4 wrought homogeneous
armor plate shall be in accordance with the appendix of this specification. Class 2 armor plate
shall not be subject to ballistic test requirements. When a complete penetration can not be
obtained for either class 1 or class 4 armor material, the following rule shall be in effect until a
new ballistic acceptance round can be utilized. When four (4) partial penetrations are above the
minimum requirement for the specific thickness, the material shall be certified as acceptable with
a V50 (which obviously can not be specified) above the minimum requirement.
3.2.7 Dimensions and tolerances.
3.2.7.1 Dimensions. Classes 1 and 2 armor plate shall comply with the dimensions and tolerances
specified on applicable drawings or in the contract (see 6.2). Class 3 armor tolerances on length
and width dimensions shall be plus 1 1/2 inches and minus zero.
3.2.7.2 Thickness.
3.2.7.2.1 DELETED.
3.2.7.2.1 Thickness measurements (class 3 armor). The thickness of all class 3 plates shall be
determined by measurements made one foot on centers over the entire surface of each plate. The
measurements shall be to the nearest thousandth of an inch. The acceptance of each plate shall be
based on these measurements meeting the thickness requirements of table V for class 3 armor.
3.2.7.2.2 Thickness tolerances. The thickness tolerances of each plate, after final treatment, shall
be in accordance with tables III and IV for classes 1 and 2 armor or with table V for class 3 armor.
3.2.7.3 Flatness. Unless otherwise specified in the contract or order (see 6.2), the flatness
tolerance of each plate shall be within the requirements specified in table VII. Tighter tolerance
requirements shall be specified in the contract or order and shall be as agreed upon between the
contractor and the procuring activity.
3.2.7.4 Waviness. Unless otherwise specified in the contract or order (see 6.2), the waviness
tolerance of each plate shall be within the requirements of table VIII for the applicable thickness.
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