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
1/
caliber .50 AP, M2 projectile (cont'd).
Thickness,
Required
Thickness,
Required
Thickness,
Required
inches
BL(P)fps
inches
BL(P)fps
inches
BL(P)fps
1.970
2320
2.165
2454
2.360
2581
1.975
2324
2.170
2457
2.365
2584
1.980
2328
2.175
2461
2.370
2587
1.985
2331
2.180
2464
2.375
2590
1.990
2334
2.185
2467
2.380
2594
1.995
2338
2.190
2471
2.385
2597
2.000
2342
2.195
2474
2.390
2600
2.005
2345
2.200
2477
2.395
2603
2.010
2349
2.205
2481
2.400
2606
2.015
2352
2.210
2484
2.405
2609
2.020
2355
2.215
2487
2.410
2612
2.025
2359
2.220
2491
2.415
2616
2.030
2362
2.225
2494
2.420
2619
2.035
2366
2.230
2497
2.425
2622
2.040
2369
2.235
2500
2.430
2625
2.045
2373
2.240
2504
2.435
2628
2.050
2376
2.245
2507
2.440
2631
2.055
2380
2.250
2510
2.445
2634
2.060
2383
2.255
2513
2.450
2638
2.065
2386
2.260
2517
2.455
2641
2.070
2390
2.265
2520
2.460
2644
2.075
2393
2.270
2523
2.465
2647
2.080
2397
2.275
2526
2.470
2650
2.085
2400
2.280
2530
2.475
2653
2.090
2404
2.285
2533
2.480
2656
2.095
2407
2.290
2536
2.485
2659
2.100
2410
2.295
2539
2.490
2662
2.105
2414
2.300
2542
2.495
2665
2.110
2417
2.305
2546
2.500
2668
2.115
2420
2.310
2549
2.505
2672
2.120
2424
2.315
2552
2.510
2675
2.125
2427
2.320
2555
2.515
2678
2.130
2431
2.325
2559
2.520
2681
2.135
2434
2.330
2562
2.525
2684
2.140
2437
2.335
2565
2.530
2687
2.145
2441
2.340
2568
2.535
2690
2.150
2444
2.345
2571
2.540
2693
2.155
2447
2.350
2575
2.545
2696
2.160
2451
2.355
2578
2.550
2699
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