MIL-PRF-22885H
3.6 Interface and dimensions. Switches shall be so constructed as to insure proper operation when mounted in
any position. The switches shall meet the interface and dimensions specified (see 3.1).
3.6.1 Mounting hardware. Each switch shall be provided with mounting hardware as specified (see 3.1 and 6.2).
Switches which are mounted by means of a threaded bushing shall include a non-turn device.
3.6.2.1 Solder terminals. Solder terminals shall be treated to facilitate soldering. Coatings such as hot solder dip
are acceptable. Silver plating shall not be used as the external coating. Gold plating, .00003 inch minimum (0.00076
mm minimum), may be used and shall be over a diffusion barrier such as nickel or palladium. For additional
information and guidance on plating see 6.13.
3.6.2.2 Screw terminals. Screw terminals shall be provided with hardware as specified (see 3.1 and 6.2). Lock
washers shall be captive to the screw.
3.6.2.3 Plug-in terminations (not applicable to printed circuit boards). Plug-in terminations shall be treated to
facilitate contact. Gold plating, .00003 inch minimum (0.00076 mm minimum) may be used and shall be over a
diffusion barrier such as nickel or palladium. For additional information and guidance on plating see 6.13.
3.6.2.4 Common termination system. Switches with common termination system, when used, shall meet
performance requirements of this specification.
3.6.3 Screw threads. Screw threads on removable threaded parts shall be in accordance with Unified Thread
Series of FED-STD-H28 or equivalent industry standard. All threaded parts shall engage by at least two full turns.
Threading of nonmetallic parts shall not be permitted.
3.6.5 Actuating mechanism. Unless otherwise specified, the external actuator shall be insulated from all current
carrying parts.
3.6.6 Lamps. Unless otherwise specified (see 3.1), the lamps shall be flange base T-1, or T-1-3/4 or equivalent.
Lamp failure shall not constitute a test failure unless the lamp is non-replaceable.
3.6.6.1 Lamp circuitry. The lamp circuits shall be insulated from the switching circuits and from the assembly case
and its mounting means.
3.6.6.2 Lamp replacement. The lamps shall be replaceable from the front of the panel. No tools of any type shall
be required to replace the lamp.
3.6.6.3 Lamp contacts. Lamp contacts shall be of the multiple contact area design to provide for more than one
bearing on the mating tip of the applicable lamp when installed. The lamp contacts shall be of suitable material or
plated to resist electrolytic corrosion of the contact or the lamp base.
3.6.7 Lens. The lens design shall permit the application of legends and shall permit positioning of the legends in
specific relationship to the non-turn device. When specified (see 3.1 and 6.2), lens markings shall conform to the
requirements of SAE-AS18012. (When abbreviations are necessary use ASME-Y14.38, as applicable.) Snap-on
type lens shall not be used for push-pull operative switches. The lens shall be free from defects which will prevent it
from meeting luminous distribution and color requirements. Unless otherwise specified, there shall be no high light
reflective surfaces on the displays.
3.6.8 Cap color filters. Material for lamp bulb filters in contact with lamps (used to convert clear incandescent
lamps to colored lighting) shall be silicone rubber, glass, or other appropriate electrically nonconductive material.
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