MIL-DTL-12560K (MR)
APPENDIX A
TABLE A-XII. Minimum required ballistic limits (protection criteria) for class 4 armor, firing
obliquity: 30°, projectile: caliber .50 M2 AP.
Thickness
Required
Thickness
Required
Thickness
Required
inches
BL(P), ft/sec
inches
BL(P), ft/sec
inches
BL(P), ft/sec
0.320
1690
0.420
2045
0.520
2400
0.325
1708
0.425
2063
0.525
2418
0.330
1726
0.430
2080
0.530
2435
0.335
1743
0.435
2098
0.535
2453
0.340
1761
0.440
2116
0.540
2471
0.345
1779
0.445
2134
0.545
2489
0.350
1796
0.450
2151
0.550
2506
0.355 1/
1814
0.455
2169
0.555
2524
0.360
1832
0.460
2187
0.560
2542
0.365
1850
0.465
2205
0.565
2560
0.370
1867
0.470
2222
0.570
2577
0.375
1885
0.475
2240
0.575
2595
0.380
1903
0.480
2258
0.580
2613
0.385
1921
0.485
2276
0.585
2631
0.590 2/
0.390
1938
0.490
2293
2648
0.395
1956
0.495
2311
0.595
2666
0.400
1974
0.500
2329
0.600
2684
0.405
1992
0.505
2347
0.605
2702
0.410
2009
0.510
2364
0.610
2719
0.415
2027
0.515
2382
0.615
2737
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.
48
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