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|  MIL-A-12560H (MR)
w/INT. AMENDMENT 4
higher ballistic protection than class 1 material against conventional hard steel core AP
projectiles, such as, the 0.50 cal, M2 AP. Class 4 material also provides greater ballistic
protection than class 1 material against very hard and brittle tungsten carbide penetrators, such
as, the 20 mm M602 APIT. In semi-infinite or appliqu-type armor configurations, class 4
material erodes heavy metal (DU or tungsten alloys) long-rod penetrators more efficiently than
class 1 material. Approximately 22% and 14% less penetration was observed on this class 4
armor at HRc 48 (BHN 451) and HRc 40 (BHN 371), respectively in the ARL R&D study.
6.2 Ordering data.
6.2.1 Procurement requirements. Procurement documents should specify the
following:
a.
Title, number, and date of this specification.
b.
Class of steel.
c.
If first article sample is required (see 3.1).
d.
If local or general heating is permitted (see 3.2.4.1).
e.
If weld repairing is permitted (see 3.2.4.2).
f.
Dimensional requirements (see 3.2.7).
g.
First article tests (see 4.1.2).
h.
When a special first article ballistic test is required (see 3.1, 4.1.3 and 6.11).
i.
If ballistic test plates may be separately heat treated from the production plates it
represents, (see 4.3.1).
j.
If ballistic acceptance samples should be other than in 4.4.2.5.
k.
If ultrasonic examination is to be different than 4.6.5.2.
l.
If certification of inspection personnel is different from 4.6.5.3.
m.
If rejection and retesting differs from 4.6.7.
n.
The reduced testing plan when applicable (see 4.6.8).
o.
Preparation for delivery if different than specified in section 5.
p.
If lifting holes are required (see 6.1.3).
6.2.2 Associated Data Item Descriptions (DIDs). This specification has been assigned an
Acquisition Management Systems Control number authorizing it as the source document for the
following DIDs. When it is necessary to obtain data, the applicable DIDs must be listed on the
Contract Data Requirements List (DD Form 1423).
DID Title
DID Number
UDI-T-23790
Report, First Article Test
UDI-T-23264
Certification Data Report
DI-MISC-80073
Armor Material Test Reports
The above DIDs were current as of the date of this standard. The ASSIST database should be
researched at http://assist.daps.dla.mil/quicksearch/ or http://assist.daps.dla.mil/ to ensure that
only current and approved DIDs are cited on the DD Form 1423.
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