INCH-POUND
MIL-A-12560H(MR)
AMENDMENT 3
27 September 2000
SUPERSEDING
AMENDMENT 2
26 July 1991
MILITARY SPECIFICATION
ARMOR PLATE, STEEL, WROUGHT, HOMOGENEOUS
(FOR USE IN COMBAT-VEHICLES AND FOR AMMUNITION TESTING)
This amendment forms a part of MIL-A-12560H(MR), dated 28 November 1990,
and is approved for use by the Army Research Laboratory, Department of the Army
and is available for use by all Departments and Agencies of the Department of
Defense.
PAGE 1
* 1.2, first sentence: Delete “shall” and substitute “should.”
* Add as new paragraphs:
“1.2.4 Class 4. Wrought armor plate which is heat treated to higher
hardness levels than class 1 armor plate to develop maximum resistance to
penetration.”
“1.2.5 Class 4a. Wrought armor plate tempered to attain a minimum
through hardness of HRc 47 (BHN 442).”
“1.2.6 Class 4b. Wrought armor plate tempered to attain a maximum
through hardness of HRc 41 (BHN 381).”
PAGE 2
* 2.2: Add two non-Government Standard reference documents.
* Add the following to the list of ASTM references:
“ASTM E 140 Standard Hardness Conversion Tables for Metals”
Add the following after the parenthetical source statement below the
ASTM address:
“SOCIETY OF AUTOMOTIVE ENGINEERS, INC. (SAE)
SAE J406 – Methods of Determining Hardenability of Steels
(Applications for copies should be addressed to Aerospace Material
Specifications, 400 Commonwealth Drive, Warrendale, PA 15096).”
AMSC N/A 1 of 4 FSC 9515
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