MIL-DTL-24560A(SH)
3.3.3 Nonmagnetic materials. Unless otherwise specified (see 3.1), all
parts shall be of a nonferrous material or a material generally considered
nonmagnetic. The magnetic permeability shall be 2.0 or less after fabrication
(see 4.4.1.9).
3.3.4 Nonmetallic materials. Nonmetallic materials shall be
nonflammable, nontoxic and fungus-inert as specified in MIL-E-917.
3.3.5 Plastics. Plastic materials shall conform to the requirements of
MIL-E-917 and as specified hereinafter.
3.3.6 Glassware. Glassware shall be high-impact, heat resistant with
an extremely low-temperature coefficient of expansion. The glass shall
withstand exposure to atmospheric sea conditions, particularly that of salt
water, high humidity, and bright sunlight without etching, discoloration, or
any change in the light transmittance.
3.3.7 Commercial (hardware) parts. Where a definite material is not
specified for utility hardware (items such as screws, bolts, and nuts),
commercial items may be used provided they meet the requirements specified
herein (see 3.3.2, 3.3.3, and 3.3.4).
3.3.8 Caulking compound. Caulking compound shall be of a good
commercial grade material compatible with the material of the basic light
assembly. Compound consistency shall be such that the light assembly can be
disassembled without requiring the use of special agents or tools.
3.3.9 Antiseize coating. Aluminum and CRES fastening parts such as
screws and bolts in contact with threaded aluminum shall be coated with an
antiseize compound in accordance with MIL-T-22361.
3.3.10 Gaskets. Unless otherwise specified (see 3.1), gaskets shall be
commercial type neoprene 6-75 Durometer hardness.
3.3.11 Prohibited materials. The prohibited materials shall be those
specified in MIL-E-917. Unless otherwise specified (see 3.1), asbestos shall
not be used.
3.4
Design and construction.
3.4.1 Light assemblies. Light assemblies shall be of the design,
construction, and physical dimensions specified (see 3.1). Unless otherwise
specified (see 6.2), lamps shall not be furnished.
3.4.1.1 Dimensional tolerances. Unless otherwise specified (see 3.1),
the following tolerances shall apply to dimensions specified in the individual
specification sheets:
(a)
Fractional dimensions - plus or minus 1/64 inch.
(b)
Decimal dimensions - plus or minus 0.005 inch.
(c)
Angular dimensions - plus or minus 1/2 degree.
Unless otherwise specified (see 3.1), a tolerance of plus or minus 1/32 inch
is acceptable on fractional dimensions that are controlled by welding or
brazing. The width tolerance shall not interfere with the interchangeability
of assemblies or parts. A tolerance of plus or minus 1/32 inch with a draft
angle is acceptable for cast parts.
3.4.1.2 Enclosures. Light assemblies shall be type I, splashproof or
type II, submersible as specified (see 1.2 and 3.1).
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