MIL-F-18327F
3.4.2.2 Screw terminals. When external screw terminals are specified (see 3.1), they shall be supplied with two
nuts, two flat washers, and one lockwasher. Radially-tapped permanent stud terminals shall be supplied with one
screw and one lockwasher. For cased filters, the height of the terminal assembly shall be the distance from the free
end of the screw to the terminal mounting surface. The type of terminal, size of screw thread, and, for all screw
terminals, the exposed length of threads ± 1/16 inch shall be as specified (e.g., screw, No. .164-32 x .375) (see 3.1).
3.4.2.3 Pin-type terminals. Pin-type terminals, for use with vacuum tube type sockets, shall conform with standard
7-pin button base E7-1, 8-pin octal base, or standard 9-pin button base E9-1 of MIL-PRF-1.
3.4.3 Mounting studs. When external mounting studs are specified (see 3.1), they shall be supplied with a locknut;
or with a flat washer, a lockwasher, and a nut.
3.4.4 Internal lead wires. Internal lead wires shall be attached to the internal components and terminals or case in
such a manner as to provide adequate electrical connection and mechanical strength.
3.4.5 Paint color. When a paint finish is specified (see 3.1), the color of the paint shall be light-gray, semigloss, in
accordance with MIL-DTL-15090 (Formula No. 111). Unless otherwise specified, the supplier shall omit paint from
the mounting and terminal area surface.
3.5 Terminal strength. When filters are tested as specified in 4.7.2, no part of the terminals shall loosen or rupture
and no other damage shall result. Bends shall not be considered as damage unless surface cracking is evident.
Except for flexible leads, permanent rotation of any terminal shall not exceed 10°. Rotation of the external portion of
the metallic portion of a hook type terminal, such as buttonhook, exceeding 10° shall not constitute a failure.
3.6 Solderability (when specified, see 3.1). When filters are tested as specified in 4.7.3, the dipped surface leads
shall be at least 95 percent covered with continuous new solder coating. The remaining 5 percent of the lead surface
may show only small pinholes or voids and these shall not be concentrated in one area. Bare base metal and areas
where the solder dip fails to cover the original coating are indications of poor solderability, and shall be cause for
rejection.
3.7 Resistance to soldering heat (when specified, see 3.1). When filters are tested as specified in 4.7.4, there
shall be no evidence of loosening of the terminals, mechanical damage, or evidence of damage to the filters.
3.8 Seal (see 4.7.5).
3.8.1 All filters. When tested as specified in 4.7.5.1, filters shall show no continuous flow of air bubbles or leakage
of compound from the body of the filter.
3.8.2 Liquid-filled filters. When tested as specified in 4.7.5.2, filters shall show no evidence of liquid leakage.
3.9 Dielectric withstanding voltage. When filters are tested as specified in 4.7.6, there shall be no arcing,
flashover, breakdown of insulation, or evidence of damage.
3.10 Insulation resistance. When measured as specified in 4.7.7, the insulation resistance between each terminal
and case or mounting shall be not less than 10,000 megohms or 1,000 megohms, as specified (see 3.1).
3.11 Electrical characteristics. When filters are tested as specified in 4.7.8, the applicable electrical characteristics
shall be as specified (see 3.1).
3.12 Stability at temperature extremes. When tested as specified in 4.7.9, filters shall meet the following
requirements:
Dielectric withstanding voltage ----------------------------Shall be as specified in 3.9.
Electrical characteristics ------------------------------------Shall be as specified (see 3.1).
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