MIL-DTL-60561C
3.2 Materials. All materials used in the manufacture of the thrusters shall conform to the specifications
referred to on the respective drawings unless specific approval in writing covering a departure therefrom has
been obtained from the cognizant Navy design activity prior to manufacture. When alternate materials or
methods of manufacture are specified on the drawings, the bidder's selections shall be clearly stated in the
proposal.
3.2.1 Raw material. The contractor shall be responsible for selecting from the classification list
contained in the raw material specification the surface and physical condition of the raw material intended
for use in manufacture.
3.3 Hardness and other physical properties. Hardness and other physical properties required by the
drawing shall be uniform throughout the part within specified tolerances. Requirements for all alloy steel
parts shall be achieved by quenching and tempering.
3.4 Hydrostatic pressure. The body and head shall withstand a hydrostatic pressure of 8,000 pounds
per square inch (psi) for 15 seconds, minimum, without leaking, deformation, or mechanical failure (see
6.4.1).
3.5 Structural strength. The assembled thruster shall withstand a static tensile force of 2,000 pounds,
minimum, for 15 seconds, minimum, between mounting points without unlocking and without mechanical
failure (see 6.4.1).
3.6 Shear pin strength. The shear pin, after application of protective finish, shall shear when a load of
48 ± 4 pounds is applied at the steady rate of 0.125 inch per minute.
3.7 Metal parts assembly. Parts shall be combined to produce an assembly which conforms to the
requirements of the metal parts assembly drawing. All threaded joints shall be assembled handtight.
3.8 Protective finish. Protective finish shall be in accordance with the applicable specifications and
shall apply to all surfaces of the component regardless of contour configuration.
3.9 Residual magnetism. The metal parts assembly shall not deflect the indicator of the compass more
than five degrees in either direction using procedures in 4.6.6.
3.10 Workmanship. Thrusters shall be free of cracks, splits, or other defects which might prevent
proper mating with connecting parts or proper functioning of the device.
3.10.1 Metal defects. All components shall be free from cracks, splits, cold shuts, inclusions, porosity,
or any similar defect.
3.10.2 Burr. No part shall have a burr which might interfere with the assembly or function of the item
or which might be injurious to personnel handling the item.
3.10.3 Foreign matter. No part or assembly shall contain chips, dirt, grease, rust, corrosion, or other
foreign matter.
4. VERIFICATION
4.1 Classification of inspections.
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