MIL-DTL-12560K (MR)
APPENDIX A
TABLE A-III. Minimum required ballistic limits (protection criteria) for class 1 and 3 armor and the
upper ballistic limits for class 3 armor; firing obliquity: 0°, projectile: caliber .50 M2 AP.
BL(P), ft/sec
BL(P), ft/sec
BL(P), ft/sec
Thickness,
Thickness,
Thickness,
CLASS
CLASS
CLASS
inches
inches
inches
3
3
3
1&3
1&3
1&3
Min
Min
Min
Max
Max
Max
0.550
1901
2047
0.695
2182
2328
0.845
2439
2585
0.555
1911
2057
0.700
2191
2337
0.850
2447
2593
0.560
1922
2068
0.705
2200
2346
0.855
2455
2601
0.565
1932
2078
0.710
2209
2355
0.860
2464
2610
0.566
1934
2080
0.715
2218
2364
0.865
2472
2618
0.570
1942
2088
0.720
2227
2373
0.870
2480
2626
0.575
1952
2098
0.725
2235
2381
0.875
2488
2634
0.580
1962
2108
0.730
2244
2390
0.880
2496
2642
0.585
1972
2118
0.735
2253
2399
0.885
2504
2650
0.590
1982
2128
0.740
2262
2408
0.890
2511
2657
0.595
1992
2138
0.745
2271
2417
0.895
2519
2665
0.600
2002
2148
0.750
2279
2425
0.900
2527
2673
0.605
2012
2158
0.755
2288
2434
0.905
2535
2681
0.610
2022
2168
0.760
2297
2443
0.910
2543
2689
0.615
2031
2177
0.765
2305
2451
0.915
2551
2697
0.620
2041
2187
0.770
2314
2460
0.920
2559
2705
0.625 1/
2051
2197
0.775
2322
2468
0.925
2566
2712
0.630
2060
2206
0.780
2331
2477
0.930
2574
2720
0.635
2070
2216
0.785
2339
2485
0.935
2582
2728
0.640
2079
2225
0.790
2348
2494
0.940
2590
2736
0.645
2089
2235
0.795
2356
2502
0.945
2597
2743
0.650
2098
2244
0.800
2365
2511
0.950
2605
2751
0.655
2108
2254
0.805
2373
2519
0.955
2612
2758
0.660
2117
2263
0.810
2382
2528
0.960
2620
2766
0.665
2126
2272
0.815
2390
2536
0.965
2628
2774
0.670
2136
2282
0.820
2398
2544
0.970
2635
2781
0.675
2145
2291
0.825
2406
2552
0.975
2643
2789
0.680
2154
2300
0.830
2415
2561
0.980
2650
2796
0.685
2163
2309
0.835
2423
2569
0.985
2658
2804
0.690
2173
2319
0.840
2431
2577
0.990
2665
2811
1/
Specification requirements begin for this ordered thickness
Note: Tabulated values on either side of the specification requirements are for interpolation
of BL(P) requirements on undersize or oversize plates.
32
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