MIL-DTL-12560K (MR)
APPENDIX A
TABLE A-XIV. Minimum required ballistic limits (protection criteria) for class 4 armor, firing
obliquity: 30°, projectile: 14.5 mm BS41 API.
Thickness
Required
Thickness
Required
Thickness
Required
inches
BL(P), ft/sec
inches
BL(P), ft/sec
inches
BL(P), ft/sec
0.740
2112
0.875
2452
1.015
2765
0.745
2125
0.880
2464
1.020
2775
0.750
2139
0.885
2476
1.025
2786
0.755
2152
0.890
2488
1.030
2796
0.760
2165
0.895
2499
1.035
2807
0.765
2178
0.900
2511
1.040
2817
0.766 1/
2181
0.905
2522
1.045
2827
0.770
2192
0.910
2534
1.050
2838
0.775
2205
0.915
2545
1.055
2848
0.780
2218
0.920
2557
1.060
2858
0.785
2231
0.925
2568
1.065
2868
0.790
2243
0.930
2579
1.070
2879
0.795
2256
0.935
2590
1.075
2888
0.800
2269
0.940
2602
1.080
2898
0.805
2282
0.945
2613
1.085
2908
0.810
2294
0.950
2624
1.090
2918
0.815
2307
0.955
2635
1.095
2927
0.820
2319
0.960
2646
1.100
2936
0.825
2331
0.965
2657
1.105
2946
0.830
2344
0.970
2668
1.110
2956
0.835
2356
0.975
2679
1.115
2965
0.840
2368
0.980
2690
1.120
2975
1.125 2/
0.845
2381
0.985
2700
2984
0.850
2393
0.990
2711
1.130
2994
0.855
2405
0.995
2722
1.135
3003
0.860
2417
1.000
2732
1.140
3012
0.865
2429
1.005
2743
1.145
3022
0.870
2440
1.010
2754
1.150
3031
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.
50
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