MIL-DTL-12560K (MR)
APPENDIX A
TABLE A-X. Minimum required ballistic limits (protection criteria) for class 2 armor, firing
obliquity: 0°, projectile: 20 mm FSP.
Thickness,
Required
Thickness,
Required
Thickness,
Required
inches
BL(P), ft/sec
inches
BL(P), ft/sec
inches
BL(P), ft/sec
0.445
1937
0.590
2417
0.740
2914
0.450
1954
0.595
2434
0.745
2931
0.455
1971
0.600
2451
0.750
2947
0.460
1987
0.605
2467
0.755
2964
0.465
2004
0.610
2484
0.760
2980
0.470
2020
0.615
2500
0.765
2997
0.475
2037
0.620
2517
0.770
3013
0.480
2053
0.625
2533
0.775
3030
0.485
2070
0.630
2550
0.780
3047
0.490
2086
0.635
2566
0.785
3063
0.495
2103
0.640
2583
0.790
3080
0.500 1/
2120
0.645
2600
0.795
3096
0.505
2136
0.650
2616
0.800
3113
0.510
2153
0.655
2633
0.805
3129
0.515
2169
0.660
2649
0.810
3146
0.520
2186
0.665
2666
0.815
3162
0.525
2202
0.670
2682
0.820
3179
0.530
2219
0.675
2699
0.825
3196
0.535
2235
0.680
2715
0.830
3212
0.540
2252
0.685
2732
0.835
3229
0.545
2268
0.690
2749
0.840
3245
0.550
2285
0.695
2765
0.845
3262
0.555
2302
0.700
2782
0.850
3278
0.560
2318
0.705
2798
0.855
3295
0.565
2335
0.710
2815
0.860
3311
0.566
2338
0.715
2831
0.865
3328
0.570
2351
0.720
2848
0.870
3345
0.575
2368
0.725
2864
0.875
3361
0.580
2384
0.730
2881
0.880
3378
0.585
2401
0.735
2898
0.885
3394
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.
45
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