MIL-DTL-12560K (MR)
APPENDIX A
TABLE A-XIII. Minimum required ballistic limits (protection criteria) for class 4 armor, firing
obliquity: 30°, projectile: 14.5 mm B32 API.
Thickness
Required
Thickness
Required
Thickness
Required
inches
BL(P), ft/sec
inches
BL(P), ft/sec
inches
BL(P), ft/sec
0.575
2220
0.645
2369
0.720
2521
0.580
2231
0.650
2380
0.725
2530
0.585
2242
0.655
2390
0.730
2540
0.590
2253
0.660
2400
0.735
2550
0.591 1/
2255
0.665
2411
0.740
2559
0.595
2264
0.670
2421
0.745
2569
0.600
2274
0.675
2431
0.750
2579
0.605
2285
0.680
2441
0.755
2588
0.610
2296
0.685
2451
0.760
2598
0.765 2/
0.615
2307
0.690
2461
2607
0.620
2317
0.695
2471
0.770
2617
0.625
2328
0.700
2481
0.775
2626
0.630
2338
0.705
2491
0.780
2636
0.635
2349
0.710
2501
0.785
2645
0.640
2359
0.715
2511
0.790
2654
1/
Specification requirements begin for this ordered thickness.
2/
Specification requirements end for this ordered thickness.
Note: Tabulated values on either side of the ordered thicknesses are for interpolation
of BL(P) requirements on undersize or oversize plates.
49
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