MIL-DTL-45225F(MR)
Minimum ballistic limits (protection at 0o obliquity)
TABLE XII.
for type I, class B material and type II material using a
caliber .50 AP, M2 projectile.1/
Thickness,
Required
Thickness,
Required
Thickness,
Required
inches
BL(P)fps
inches
BL(P)fps
inches
BL(P)fps
1.450
1921
1.620
2060
1.795
2194
1.455
1925
1.625
2064
1.800
2198
1.460
1929
1.630
2068
1.805
2201
1.465
1933
1.635
2072
1.810
2205
1.470
1938
1.640
2075
1.815
2209
1.475
1942
1.645
2079
1.820
2212
1.480
1946
1.650
2083
1.825
2216
1.485
1950
1.655
2087
1.830
2220
1.490
1954
1.660
2091
1.835
2223
1.495
1958
1.665
2095
1.840
2227
1.500
1962
1.670
2099
1.845
2231
2/ 1.501
1963
1.675
2103
1.850
2234
1.505
1967
1.680
2107
1.855
2238
1.510
1971
1.685
2110
1.860
2242
1.515
1975
1.690
2114
1.865
2245
1.520
1979
1.695
2118
1.870
2249
1.525
1983
1.700
2122
1.875
2253
1.530
1987
1.705
2136
1.880
2256
1.535
1991
1.710
2130
1.885
2260
1.540
1995
1.715
2134
1.890
2263
1.545
2000
1.720
2137
1.895
2267
1.550
2004
1.725
2141
1.900
2271
1.555
2008
1.730
2145
1.905
2274
1.560
2012
1.735
2149
1.910
2278
1.565
2016
1.740
2153
1.915
2281
1.570
2020
1.745
2157
1.920
2285
1.575
2024
1.750
2160
1.925
2289
1.580
2028
1.755
2164
1.930
2292
1.585
2032
1.760
2168
1.935
2296
1.590
2036
1.765
2171
1.940
2299
1.595
2040
1.770
2175
1.945
2303
1.600
2044
1.775
2179
1.950
2306
1.605
2048
1.780
2183
1.955
2310
1.610
2052
1.785
2186
1.960
2313
1.615
2056
1.790
2190
1.965
2317
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