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MIL-DTL-12560 Armor Plate, Steel, Wrought, Homogeneous \(For Use In Combat-Vehicles And For Ammunition Testing\)This specification covers wrought-steel homogeneous armor plate for ordered thicknesses from 0.098 inch \(2.5 mm\) up to an ordered thickness of 6.000 inches \(152.4 mm\), inclusive, for use in combat-vehicles and for ordered thicknesses from 0.250 inches \(6.35 mm\) up to an ordered thickness of 12.000 inches \(304.8 mm\), inclusive, for use in proof and acceptance testing of armor defeating ammunition \(see 6.1, 6.2, and 6.3.3\).

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MIL-DTL-12560K (MR)

APPENDIX A

TABLE A-IV. Minimum required ballistic limits (protection criteria) for class 1, 3 and 4 armor

and the upper ballistic limits for class 3 armor; firing obliquity: 0�, projectile: 20 mm M602 API-T.

Continued.

BL(P), ft/sec

Thickness,

CLASS

inches

1, 3 & 4

Min

Max

2.060

2854

3057

2.320

3052

3282

2.580

3238

3493

2.070

2862

3066

2.330

3060

3290

2.590

3245

3501

2.080

2870

3075

2.340

3067

3298

2.600

3252

3509

2.090

2877

3084

2.350

3075

3307

2.610

3259

3516

2.100

2885

3093

2.360

3082

3315

2.620

3265

3524

2.110

2893

3102

2.370

3089

3323

2.630

3272

3532

2.120

2901

3110

2.380

3096

3331

2.640

3279

3540

2.130

2909

3119

2.390

3104

3340

2.650

3286

3548

2.140

2916

3128

2.400

3111

3348

2.660

3293

3556

2.150

2924

3137

2.410

3118

3356

2.670

3299

3563

2.160

2932

3145

2.420

3125

3364

2.680

3306

3571

2.170

2940

3154

2.430

3132

3372

2.690

3313

3579

2.180

2947

3163

2.440

3140

3381

2.700

3320

3586

2.190

2955

3171

2.450

3147

3389

2.710

3326

3594

2.200

2963

3180

2.460

3154

3397

2.720

3333

3602

2.210

2970

3188

2.470

3161

3405

2.730

3340

3610

2.220

2978

3197

2.480

3168

3413

2.740

3346

3617

2.750 2/

2.230

2985

3206

2.490

3175

3421

3353

3625

2.240

2993

3214

2.500

3182

3429

2.760

3360

3632

2.250

3000

3223

2.510

3189

3437

2.770

3366

3640

2.260

3008

3231

2.520

3196

3445

2.780

3373

3648

2.270

3015

3240

2.530

3203

3453

2.790

3380

3655

2.280

3023

3248

2.540

3210

3461

2.800

3386

3663

2.290

3030

3257

2.550

3217

3469

2.810

3393

3670

2.300

3038

3265

2.560

3224

3477

2.820

3400

3678

2.310

3045

3273

2.570

3231

3485

2.830

3406

3686

Specification requirements end 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.