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|  MIL-C-24196A(SH)
3.3.5 Fastening devices. Fastening devices shall be in accordance with
MIL-STD-1754 and shall be installed with means for preventing change of
tightness. Such parts subject to removal or adjustment shall not be swaged,
peened, staked, or otherwise permanently installed. Fastening devices shall be
tightened to torque limits as established by the manufacturer's standard for
tightening to preclude loosening by normal operation or vibration.
3.3.6 Surfaces. Surfaces shall be cleaned and free from dirt, fins, sprues,
scale, flux or other harmful or extraneous materials. External surfaces shall
be smooth and the edges shall be either rounded or beveled.
3.3.7 Painting. Unless otherwise specified (see 6.2.1), parts other than
corrosion resistant steel shall be painted in accordance with the contractor's
standard commercial practice.
3.3.8 Threads. Threaded parts shall be in the inch system and conform
to MIL-STD-1251. Tapered pipe threads shall not be permitted for shipboard
equipment.
3.3.9 Shock. The equipment shall meet the requirements of grade B,
class I equipment for electrical enclosures, and class II for cleaner and
rinse consoles, medium weight, as specified in MIL-S-901.
3.3.10 Vibration. The equipment shall meet the requirements for type I
in accordance with MIL-STD-167-1.
3.3.11 Mercury. The equipment shall contain neither mercury or mercury
components, nor be exposed to free mercury during manufacture.
3.3.12 Caution or warning plates. A caution or warning plate shall be
furnished on the equipment in a visible location. The caution or warning plate
shall include the following: "The use of "Freon" or other solvent in this
equipment is strictly prohibited."
3.4 Components. The equipment shall consist of, but shall not be
limited to, the following principal components, attachments and accessories
necessary to meet the operational and performance requirements specified
herein.
3.4.1 Ultrasonic generator. The ultrasonic generator shall conform to the
requirements of MIL-E-917 and MIL-E-16400. The generator shall provide sufficient
energy in conjunction with the transducers to meet cleaning requirements of this
specification and shall have an average continuous output as specified in table I
at a frequency between 19 and 21 kilohertz. The frequency shall be manually tunable
to a fixed frequency for maximum performance. Solid state electronic parts and
other components shall be incorporated in capacities safely below their rated
maximum output for optimum reliability. Physical and electronic protection shall
be included for insurance against catastrophic failure through exposure to liquid
or dry tank operation.
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