MIL-DTL-62567D(AT)
3.3 Product marking. The part identification number, mill heat marking, preset arrow
and manufacturer s identification shall be applied to the ends of the torsion bar as specified on
Drawing 12292010.
3.4 Workmanship. The torsion bar shall be free of defects such as scratches, nicks, tool
marks, burrs, sharp edges, scratched finish, peeled or blistered primer, or improperly applied
protective covering (see 4.6.3).
4. VERIFICATION
4.1 Classification of inspections. The inspection requirements specified herein are
classified as follows:
a. First article inspection (see 4.4).
b. Conformance inspection (see 4.5).
4.2 Materials discontinuities and flaws. Materials shall be free of discontinuities and
flaws that will affect torsion bar function and, as a minimum, the materials shall pass the
following tests:
a. To determine conformance with 3.2.1.1a, all billet materials shall pass the
ultrasonic test requirements of SAE AMS-STD-2154, type I or II, class A.
b. To determine conformance with 3.2.1.1b, all billet materials shall be macroetched
in accordance with ASTM A604 at each crop location. The macrostructures shall
be equal to or better than severity A for class 1 or 2 and severity B for class 3 and
4.
c. To determine conformance to 3.2.1.2a, all finished bar stock shall pass the
ultrasonic test requirements of SAE AMS-STD-2154, type I or II, class AA.
d. To determine conformance with 3.2.1.2.b.1, all finished bar stock shall pass
100 percent magnetic particle inspection using the fluorescent wet continuous
method in accordance with ASTM E1444, except waive the frequency and
severity requirements as specified in SAE AMS 2300.
e. To determine conformance to 3.2.1.2.b.2, all finished bar stock shall pass the
ultrasonic test requirements of SAE AMS-STD-2154, type I or II by the Shear
Wave (Angle Beam) Technique. Equipment calibration shall be performed using
a cylindrical specimen of the same diameter and surface finish as the finished
product containing a groove not greater than 0.004 inches deep by 4 inches long,
oriented in the longitudinal direction of the bar. Actual dimensions of the notch
shall be measured and marked on the cylindrical specimen.
4.2.1 Billet material properties. If required by the Government (see 6.2), the contractor
shall provide a sample of the billet material from each mill heat crop location for verification of
material properties. The sample shall be produced using the supplier s standard manufacturing
practices.
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