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Mil-A-12560H 1990

 

Military Specification Armor Plate, Steel, Wrought, Homogeneous (for Use in Combat-Vehicles and for Ammunition Testing)

  1. 1.1 Scope.

    This specification covers wrought-steel homogeneous armour plate in thicknesses from ¼ to 6 inches inclusive for use in combat-vehicles and ¼ to 12 inches inclusive for use in proof and acceptance testing of armour defeating ammunition.
  2. 1.2 Classification.

    Wrought armour shall be of the following classes as specified:
    1. 1.2.1 Class 1.

      Wrought armour plate which is heat treated to develop maximum resistance to penetration.
    2. 1.2.2 Class 2.

      Wrought armour plate which is heat treated to develop maximum resistance to shock.
    3. 1.2.3 Class 3.

      Wrought armour plate which is heat treated to develop specific hardness and impact values for evaluation of armour defeating ammunition only. This class armour is not intended for use in combat- vehicles. To meet the thickeness tolerances of this class armour special surface finishing may be required.
TABLE IX. Ballistic test plate sizes and corresponding test projectiles for first article and acceptance testing.

Nominal thickness

range (inches)

Minimum size (a) of

test plates (inches)

Test projectile and obliquity

NOTE:

  1. (a) Other sizes may be submitted for the convenience of the manufacturer if approved by the Armor Vulnerability Division, USACSTA, Aberdeen Proving Ground.
  2. (b) No ballistic test required.
0.25 to 0.565 incl. 12 X 36 Cal .30AP, M2 at 0°
0.565 to 1.125 incl. 12 X 36 Cal .50AP, M2 at 0°
1.126 to 2.750 incl. 12 X 36 20-mm APIT, M602 at 0°
2.751 to 3.500 incl. 60 X 60 90-mm APC, M82 at 45°
3.501 to 3.999 incl. 60 X 60 90-mm APC, M82 at 30°
4.000 to 6.250 incl. 60 X 60 90-mm AP, M318 at 0°
Over 6.251 (b)