MIL-DTL-12560K (MR)
6.1 Intended use. The armor specified herein is intended for use on combat vehicles and/or proof
and acceptance testing of armor defeating ammunition, but should also be applicable to armor for
emplacements, shields, pill boxes, testing, and the like.
6.1.1 Class 1. Class 1 wrought armor plate is intended for use in those areas where maximum
resistance to penetration by armor piercing types of ammunition is required. Please note that
MIL-DTL-46177, entitled, "Armor, Steel Plate and Sheet, Wrought, Homogeneous (1/8 to less
than 1/4 inch thick)" was incorporated into this document for new design. MIL-DTL-46177C
has been in-activated for new designs; therefore, legacy designs/items (contracts/drawings)
which used MIL-DTL-46177C in the past can continue to use MIL-DTL-46177C. The current
thickness of this specification was even further reduced to 0.098 inches.
6.1.2 Class 2. Class 2 wrought armor plate is intended for use in those areas where maximum
resistance to failure under conditions of high rates of shock loading is required and where
resistance to penetration by armor piercing ammunition is of secondary importance. It is intended
for use as protection against anti-tank land mines, hand grenades, bursting shells, and other blast-
producing weapons.
6.1.3 Class 3. Class 3 wrought armor plate is intended for use in the proof and acceptance
testing of armor defeating ammunition. This class is not intended for use in combat vehicles. Lift
hole requirements for Class 3 armor should be specified by the procuring activity.
6.1.4 Class 4a. Class 4a wrought armor plate has the same maximum carbon content as the other
classes, but is tempered at lower temperatures (in Stage I) to give higher hardness. This higher
hardness gives the armor enhanced resistance to ballistic penetration.
6.1.5 Class 4b. Class 4b wrought armor has the same maximum carbon content as the other
classes, but is tempered at lower temperatures (in Stage I) to give higher hardness. This higher
hardness gives the armor enhanced resistance to ballistic penetration. Class 4b has air hardening
ability which may lend itself to applications requiring heat treatment after fabrication by forming
or other operations.
6.2 Ordering data. Procurement documents should specify the following:
a. Title, number and date of this specification.
b. Specify ordered thickness (see 1.1 and 3.2.8.1) and classification (see 1.2).
c. If first article samples are required (see 3.1, 4.4, and 4.4.2).
d. If the declared chemistry composition can be different (see 3.2.1).
e. If an analysis of Antimony, Arsenic or Lead is required (see 3.2.1)
f. If a CE limit for Class 3 material, is required (see 3.2.2.2).
g. If a different CE is required for Class 4a material (see (3.2.2.3).
h. If a CE limit for Class 4b material, is required (see 3.2.2.4).
i. If the condition of the plates is different (see 3.2.4 and 3.2.11.1).
j. If descaling is required (see 3.2.4).
k. If weld repair is not permitted (see 3.2.5.3.1 and 3.2.5.3.2).
l. If a bend test is not required for material less than 1/2 inch in thickness (see 3.2.6.3).
m. If a bend test is required for material greater than 1/2 inch in thickness (see 3.2.6.3
and Table V).
n. If visual inspection requirement is different (see 3.2.6.3).
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