MIL-DTL-12560K (MR)
3.2.7 Ballistic requirements. Ballistic requirements shall be in accordance with the Appendix A
of this specification. When a complete penetration cannot be obtained, 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 cannot be specified) above the minimum
requirement. There are no ballistic test requirements for class 2 plate thicker than 1.000 inch.
3.2.7.1 Ballistic test plate information. For each lot of armor plate a properly completed Rolled
Homogeneous Armor (RHA) Test Data Form (see Figure 1) shall be submitted with each
ballistic test plate that represents that particular processing lot.
3.2.8 Dimensions and tolerances.
3.2.8.1 Dimensions. Armor plates shall comply with the dimensions specified in the applicable
drawings or in the contract or purchase order (see 6.2). Unless otherwise specified in the
contract or order (see 6.2), dimensional tolerances will be in accordance with Table III. Armor
plate tolerances on length and width dimensions shall be plus 2 inches and minus zero.
3.2.8.2 Thickness.
3.2.8.2.1 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 III.
3.2.8.2.2 Thickness tolerances. The thickness tolerances of each plate, after final treatment, shall
be in accordance with Table III. The contract or purchase order (see 6.2) shall specify the
thickness tolerance when not specified in Table III.
3.2.8.3 Flatness. Unless otherwise specified in the contract or order (see 6.2), the flatness
tolerance of each plate shall be within one-half of the tolerance listed in ASTM A6/A6M (As of
the release date of MIL-DTL-12560K (MR), the appropriate table is Table 14, however, this
table may be re-numbered during a future revision or update, so caution should be taken by the
user). Tighter tolerance requirements shall be specified in the contract or purchase order (see
6.2) and shall be as agreed upon between the contractor and the procuring activity.
3.2.8.4 Waviness. The permitted variation in waviness is a function of the permitted variation
from a flat surface as obtained from Table 14 in ASTM A6/A6M. Unless otherwise specified in
the contract or purchase order (see 6.2), the waviness tolerance of each plate shall be one-half the
tolerance listed in ASTM A6/A6M Table 15, using the applicable full tolerance obtained from
the flatness tolerance table (Table 14) for the appropriate plate thickness and width. The one-
half tolerance reduction shall not be applied to both the flatness table and the waviness table to
determine waviness tolerance. (As of the release date of MIL-DTL-12560K (MR), the
appropriate table is Table 15, with reference to Table 14, however, these tables may be re-
numbered during a future revision or update to ASTM A6/A6M, so caution should be taken by
the user).
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