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Hardness and other physical properties |
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| MIL-I-46497B
3.2 Materials. All materials used in the manufacture of the initiators 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 and steel
parts shall be achieved by quenching and tempering.
3.4 Hydrostatic pressure. The initiator chamber and cap shall withstand a hydrostatic pressure of 5500
to 6500 pounds per square inch (psi) for 15 seconds minimum, without deformation or mechanical failure (see
4.6.2 and 6.3.1).
3.5 Firing pin release. The firing pin of the metal parts assembly, less safety pin, chamber, and cartridge
retainer, shall release from the cocked position when the application of an axial load of 20 to 35 pounds has
withdrawn the initiator pin 3/4 inch, maximum (see 4.6.3).
3.6 Initiator pin security. Application of an axial load of 200 to 220 pounds to the initiator pin of the
metal parts assembly shall not withdraw the initiator pin past the safety pin. Load application shall cause no
permanent deformation of the safety pin (see 4.6.4).
3.7 Metal parts assembly. Parts shall be combined to produce an assembly conforming 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 (see 4.6.5).
3.9 Residual magnetism. The metal parts assembly shall not deflect the indicator of the compass more
than 5 degrees in either direction (see 4.6.6).
3.10 Workmanship. Assemblies 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.
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