MIL-DTL-21604F
3.5.2 Stops. Switches shall be provided with adjustable stops as required (see 3.1) to limit switch positions.
Unless otherwise specified (see 6.2), screws and lockwashers required as parts of adjustable stops shall be placed in
sturdy bags firmly attached to the switches.
3.5.3 Operating shaft. The shaft shall be steel and shall be insulated from all current-carrying members. The
configuration and dimensions shall be as specified (see 3.1).
3.5.3.1 Perpendicularity of operating shaft (applicable to JR, JM, RJR, and RJRA switches). For JR and JM
switches with 15 decks or more, the plane generated by the mounting surfaces of the mounting pads shall be
perpendicular to the operating shaft within 1 degree. For RJR and RJRA switches, the mounting surface shall be
perpendicular to the centerline of the operating shaft, at the lock arm, within .055 inch (1.40 mm).
3.5.3.2 Rotational float of shaft. For types RJR and RJRA switches, the rotational float of the operating shaft shall
not exceed 3 degrees in the detent position before and after the endurance tests. For all other switches, the
rotational float of the operating shaft shall not exceed 6 degrees in the detent position before and after the endurance
test.
3.5.4.1 Alignment (applicable to RJR and RJRA switches). For RJR and RJRA switches, the centerlines of the
contact terminals in successive sections shall be in line with the centerline of the corresponding contact terminal in
the first section within .020 inch (.51 mm).
3.5.5 Indexing. Switches shall have a positive detent or indexing mechanism, locating each contact position,
except when spring return action is specified (see 3.1). The positive detent or indexing mechanism shall be designed
to minimize the possibility of the movable element or elements coming to rest between positions. Switches with
spring return mechanism shall return from the full travel momentary position to the specified fixed position within 5
degrees, including the movable elements, when the operating force is removed. Glass or other fragile materials shall
not be used in detent or indexing mechanisms.
3.5.6 Contact mating. The movable switch blade contacts shall provide a firm wiping action and shall engage both
sides of the stationary contacts at the contact engagement areas with a uniform positive pressure.
3.5.7 Barriers. Unless otherwise specified (see 3.1), barriers shall be provided between current carrying terminals
of adjacent decks and shall be of the diameter specified (see 3.1). Barrier material shall be FBE laminate in
accordance with MIL-I-24768/13 or GME in accordance with MIL-I-24768/1. The barrier surface and edge finish shall
be smooth and non-abrasive. Varnish in accordance with ASTM D3955 shall be applied after any required marking
has been applied to plastic laminate barriers.
3.6 Circuit configuration. Switches shall make and break the specified circuits in all positions of all sections (see
4.8.2). The making and breaking of circuits, in both momentary and detented positions, shall be positive. In
switching break-before-make contact arrangement, the first contact fully breaks before the second contact is made.
In switching make-before-break contact, the second contact is closed before the first is open.
3.7 Strength of mounting bushing (bushing mounted switches only). There shall be no damage to the switch,
nonturn device, or loosening or twisting of the bushing relative to the switch front plate assembly (see 4.8.3).
3.8 Torque.
3.8.1 Rotational. The torque required to rotate the shaft from each detent position to the next shall be as specified
(see 3.1 and 4.8.4). When applicable, the torque required to rotate the shaft into each momentary position shall be
3.8.2 Stops (applicable only to switches with stops). There shall be no broken, loose, deformed, or displaced
parts, nor shall the contacts transfer from their proper condition (see 4.8.4.2).
3.9 Terminal strength. The switch shall be able to operate mechanically and electrically (see 4.8.5). There shall
be no short circuitry, breakage, or damage to the switch.
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