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MIL-A-12560H (MR)
w/INT. AMENDMENT 4
6.3 Thickness. The symbol "T" is used throughout this specification to indicate the nominal
thickness of the plate under consideration.
6.4 Definitions.
6.4.1 Contractor. The contractor or prime contractor is the company which has a direct contract
from the Government to furnish an end item, usually a vehicle.
6.4.2 Contracting officer. The term "contracting officer' means the person executing a contract
on behalf of the Government and any other officer or civilian employee who is properly
designated contracting officer; and the term includes, except as otherwise provided, the
authorized representative of a contracting officer acting within the limits of his authority.
6.4.3 Homogeneous rolled armor. Homogeneous rolled armor is armor having uniform
composition heat treatment.
6.4.4 Manufacturer. The manufacturer is defined as the company producing the steel alloy plate.
6.4.5 Procuring activity. The term "procuring activity" is that activity of the Government which
actually initiates the request for procurement and maintains the records of the procurement.
6.4.6 Slivers. An imperfection consisting of a very thin elongated piece of metal attached by only
one end to the parent metal into whose surface it has been worked.
6.4.7 Laps. A surface imperfection with appearance of a seam caused by hot metal, fins or sharp
corners being folded over and thus being forged or rolled into the surface but without being
welded.
6.4.8 Checks. Numerous very fine cracks at the surface of a metal part. Checks may appear
during processing or during service and are most often associated with thermal cycling or
thermal treatment. Also called check marks, checking, and heat checks.
6.4.9 Seams. An unwelded fold or lap that appears as a crack, usually resulting from a
discontinuity on a metal surface.
6.4.10 Blisters. A raised area, often dome shaped, resulting from delamination under pressure of
expanding gas trapped in a metal in a near sub-surface zone. Very small blisters may be called
pinhead blisters or pepper blisters.
6.4.11 Snakes. Any crooked surface imperfection in a metal plate, resembling a snake.
6.4.12 Cold shuts. Freezing of the top surface of an ingot before mold is full.
6.4.13 Burning. Permanently damaged metal due to overheating enough to cause incipient
melting or intergranular oxidations. Note: this condition is usually obscured by normal cleaning
21

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