MIL-DTL-24558B
3.6.3 Threaded parts or devices. Screws, nuts, bolts, and press-fit fasteners shall show no
evidence of cross threading, mutilation, or detrimental or hazardous burrs.
3.6.3.1 Tightness. All screw-type fasteners shall be tight. The word tight means that the
screw shall be firmly secured and that there shall be no relative movement possible between the
attached parts.
3.6.4 Riveting. The riveting operation shall be carefully performed in order to assure that
rivets are tight and satisfactorily headed with the rivet heads tightly seated against their bearing
surface.
3.6.5 Brazing and welding. All brazing and welding shall be free from any harmful
defects such as cracks, porosity, undercuts, voids, and gaps. There shall be no burn-through.
Fillets shall be uniform and smooth. Angular or thickness misalignment, warping, or dimensional
change due to heat from the brazing and welding operation shall be within permitted tolerances.
There shall be no damage to adjacent parts resulting from the brazing and welding.
3.7 Performance characteristics.
3.7.1 Dielectric withstanding voltage. The terminal connection boxes shall conform to a
dielectric withstanding voltage requirement of twice the rated voltage, plus 1,000 volts alternating
current (AC) applied between isolated circuits and live parts and ground. Any evidence of arcing
(other than at test probes), corona (visible, audible, or smell), flashover, or punctured insulation
shall be interpreted as failure to pass the test (see 4.5.2).
3.7.2 Insulation resistance. The insulation resistance between all current carrying and
noncurrent carrying parts of the terminal connection boxes or parts shall be not less than 10
megohm when tested as specified in 4.5.3.
3.7.3 Effectiveness of enclosure. The terminal connection boxes shall show no signs of
water leakage when subjected to the test specified in 4.5.4.
3.7.4 Vibration. The terminal connection boxes shall conform to the vibration
requirements of type I of MIL-STD-167-1. These tests may be conducted with the terminal
connection boxes in the de-energized condition. The terminal connection boxes shall show no
evidence of mechanical or electrical damage or loosening of parts following the tests specified in
3.7.5 Shock. The terminal connection boxes shall conform to the shock requirements of
grade A, class I, type C of MIL-S-901. These tests may be conducted with the terminal
connection boxes in the de-energized condition. Following the test specified in 4.5.6, there shall
be no signs of mechanical or electrical damage, breakage, or loosening of parts and distortion of
sides, bottom, or cover of the enclosure.
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