MIL-DTL-12560K (MR)
on any thermally cut edge whether detected by nondestructive inspection, or as agreed upon in
the contract. The heat affected zone of thermally cut plates (up to and including 1/2 inch in
thickness) shall not exceed 1.2 times the plate's thickness from the cut edge. For plates over 1/2
inch thick, the heat affected zone shall not exceed 5/8 inch from the cut edge. In order to have
the heat affected zone exceed these limits approval shall be obtained from the procuring activity
and shall be as specified in the contract or purchase order (see 6.2). Supplier must demonstrate
this capability to the procuring activity during First Article Testing.
3.2.11.3 Edge condition. Plate edge on plates delivered after heat treatment shall be free of
cracks. The supplier shall practice such necessary process controls to prevent this condition.
3.2.11.4 Internal soundness. Ultrasonic testing is not required for plates with an ordered
thickness that is less than or equal to 0.625 inch gauge. Plates over 0.625 inch must be
ultrasonically tested unless supplier can prove substantial plates in the 0.626 to 2.00 inch gauge
range have been ultrasonically tested in the past without findings. If supplier can demonstrate
excellent internal soundness history, then only one plate from every lot with an ordered thickness
between 0.626 and 2.000 inches shall be ultrasonically examined for internal soundness in
accordance with 4.7.3. Every plate from every lot that has an ordered thickness greater than 2
inches shall be ultrasonically examined for internal soundness in accordance with 4.7.3. The
acceptance level shall be C, unless otherwise specified in the contract or purchase order (see 6.2).
3.2.11.4.1 Acceptance criteria.
3.2.11.4.1.1 Single linear indications. In any four inches of length a single linear indication shall
not exceed twice the plate thickness.
3.2.11.4.1.2 Multiple linear indications. Multiple linear indications shall not exceed 1-1/2 times
the plate thickness if two or more lie in the same plane. The total length of indications in one
plane, in any four inch length, shall not exceed twice the plate thickness. No more than ten
indications, whether in one plane or multiple planes, are permitted in any four inch length.
3.2.11.4.1.3 Cracks. All cracks shall be rejectable (see 6.3.18 for definition).
3.2.11.4.1.4 Removal of large indications. Large indications shall be removed by the
manufacturer or processor by grinding, or weld repair as specified in 3.2.5.3.
4. VERIFICATION
4.1 Classification of inspection. The inspection requirements specified herein are classified as
follows:
a. First article inspection (see 4.4).
b. Production acceptance inspection (see 4.5).
4.2 Testing responsibility and facilities. Unless otherwise specified in the contract or purchase
order (see 6.2), the contractor is responsible for the performance of all the requirements as
specified herein. Unless otherwise specified in the contract or purchase order (see 6.2), the
contractor may use his own or any other facilities suitable for the performance of the
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