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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-VI. Minimum required ballistic limits (protection criteria) for class 1 and 3 armor and

the upper ballistic limits for class 3 armor; firing obliquity: 30�, projectile: 90 mm M82 APC.

BL(P), ft/sec

Thickness,

CLASS

inches

1&3

Min

Max

3.425

1924

2116

3.570

1986

2178

3.720

2048

2240

3.430

1926

2118

3.575

1988

2180

3.725

2051

2243

3.435

1929

2121

3.580

1990

2182

3.730

2053

2245

3.440

1931

2123

3.585

1993

2185

3.735

2055

2247

3.445

1933

2125

3.590

1995

2187

3.740

2057

2249

3.450

1935

2127

3.595

1997

2189

3.745

2059

2251

3.455

1937

2129

3.600

1999

2191

3.750

2061

2253

3.460

1939

2131

3.605

2001

2193

3.755

2063

2255

3.465

1942

2134

3.610

2003

2195

3.760

2065

2257

3.470

1944

2136

3.615

2005

2197

3.765

2067

2259

3.475

1946

2138

3.620

2007

2199

3.770

2069

2261

3.480

1948

2140

3.625

2009

2201

3.775

2071

2263

3.485

1950

2142

3.630

2011

2203

3.780

2073

2265

3.490

1952

2144

3.635

2013

2205

3.785

2075

2267

3.495

1954

2146

3.640

2015

2207

3.790

2077

2269

3.500

1957

2149

3.645

2018

2210

3.795

2079

2271

3.501 1/

1957

2149

3.650

2020

2212

3.800

2081

2273

3.505

1959

2151

3.655

2022

2214

3.805

2083

2275

3.510

1961

2153

3.660

2024

2216

3.810

2085

2277

3.515

1963

2155

3.665

2026

2218

3.815

2087

2279

3.520

1965

2157

3.670

2028

2220

3.820

2089

2281

3.525

1967

2159

3.675

2030

2222

3.825

2091

2283

3.530

1969

2161

3.680

2032

2224

3.830

2093

2285

3.535

1971

2163

3.685

2034

2226

3.835

2095

2287

3.540

1974

2166

3.690

2036

2228

3.840

2097

2289

3.545

1976

2168

3.695

2038

2230

3.845

2099

2291

3.550

1978

2170

3.700

2040

2232

3.850

2101

2293

3.555

1980

2172

3.705

2042

2234

3.855

2103

2295

3.560

1982

2174

3.710

2044

2236

3.860

2105

2297

3.565

1984

2176

3.715

2046

2238

3.865

2107

2299

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.